Emerson Liebert Nx Ups 40 200Kva 480V 60Hz Users Manual 25217

Emerson-Liebert-Nx-On-Line-Ups-40-200Kva-User-Guide-679672 emerson-liebert-nx-on-line-ups-40-200kva-user-guide-679672

Manual-UPS-Liebert-N.. Manual-UPS-Liebert-NX

: Emerson Emerson-Liebert-Nx-Ups-40-200Kva-480V-60Hz-Users-Manual-165406 emerson-liebert-nx-ups-40-200kva-480v-60hz-users-manual-165406 emerson pdf

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AC Power
For Business-Critical Continuity™

Liebert NX™ UPS
User Manual–40-200kVA, 480V, 60Hz

TABLE OF CONTENTS
IMPORTANT SAFETY INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
GLOSSARY OF SYMBOLS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
1.0
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
2.0
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
2.1
2.2

External Inspections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Internal Inspections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.2.1

2.3

Preliminary Checks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.3.1

2.4

Identification. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

UPS Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.4.1
2.4.2
2.4.3

2.5
2.6

Storing for Delayed Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Positioning the UPS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Environmental Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Special Considerations for Parallel Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Considerations in Moving the Liebert NX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Mechanical Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.6.1
2.6.2
2.6.3
2.6.4

Clearances. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Floor Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cable Entry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Optional Cabinets. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

10
10
10
11

3.0

ELECTRICAL CONNECTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

3.1

Power Cabling. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
3.1.1
3.1.2
3.1.3
3.1.4
3.1.5
3.1.6
3.1.7

3.2

13
14
14
15
15
15
16

Control Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
3.2.1

3.3

Cable Rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
UPS Input Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cabling Guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cable Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Safety Ground . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Protective Devices. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cabling Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Monitor Board Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Dry Contacts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
3.3.1
3.3.2
3.3.3
3.3.4
3.3.5

Input Dry Contacts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maintenance Bypass Cabinet Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Battery Circuit Breaker Control Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output Dry Contacts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
EPO Input—Optional . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

20
20
21
21
22

4.0

BATTERY INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

4.1
4.2

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

i

4.3

External Battery Cabinet Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
4.3.1
4.3.2
4.3.3
4.3.4

Battery Cabinets. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Connecting the Batteries . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Connecting the Battery Cabinet to the UPS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

24
25
25
26

4.4
4.5
4.6

Non-Standard Batteries . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
BCB Shunt Trip . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Alber Monitoring System—Optional . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

5.0

OPTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

5.1

Load Bus Synchronization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
5.1.1
5.1.2

5.2

Configuring Parallel Sbasystem Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
5.2.1
5.2.2
5.2.3
5.2.4

5.3

Performance Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
LBS Cable and Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Features of Parallel System. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating Principles. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operation Modes Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

30
30
32
32

Installing Parallel System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
5.3.1
5.3.2
5.3.3
5.3.4
5.3.5
5.3.6

Conditions for Parallel System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cabinet Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Preliminary Checks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Cables. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Parallel Control Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Emergency Power Off (EPO) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

32
33
33
33
33
35

6.0

UPS SPECIFICATIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

6.1
6.2
6.3
6.4

Conformity and Standards. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
UPS Environmental . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
UPS Mechanical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
UPS Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

36
36
36
37

6.4.1
6.4.2
6.4.3
6.4.4

7.0

Input Rectifier. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
DC Intermediate Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Inverter Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Bypass Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
LIEBERT® BDC™ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41

7.1

Normal (UPS) Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
7.1.1

7.2
7.3
7.4

Maintenance Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Locating the Cabinet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Cable Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
7.4.1
7.4.2
7.4.3

7.5

Bypass Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

Wiring Preparation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Power Cable Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Input/Output Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

Bolting Cabinets Together . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

ii

8.0
9.0

INSTALLATION DRAWINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .51
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .77

9.1

General Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
9.1.1
9.1.2

Bypass Supplies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
Operating Modes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78

10.0

OPERATOR CONTROL AND DISPLAY PANEL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80

10.1

Operator Control Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
10.1.1 Display Panel Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80

10.2
10.3
10.4
10.5
10.6
10.7
10.8
10.9
10.10
10.11
10.12

Mimic Display Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Control Buttons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Audible Buzzer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
LCD Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Navigation Keys . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
UPS System Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
LCD Menus and Data Items . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Language Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Current Date and Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
UPS Status Messages. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Types of LCD Screens . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

81
82
83
83
84
84
85
88
88
90
91

10.12.1 Opening Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
10.12.2 Default Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
10.12.3 UPS Help Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
10.12.4 Screen Saver Window. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

91
91
92
92

10.13 Pop-Up Windows . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
10.13.1 From Bypass to Inverter Mode With Power Interruption . . . . . . . . . . . . . . . . . . . . . . . . . . . .
10.13.2 From Inverter to Bypass Mode With Interruption . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
10.13.3 System Self-Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
10.13.4 Battery Capacity Test Confirmation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
10.13.5 Battery Self-Test Aborted, Condition Not Met . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
10.13.6 Battery Refresh Charge Aborted, Condition Not Met . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

93
93
93
93
93
93

11.0

OPERATING INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94

11.1

Liebert® NX™ Operating Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
11.1.1 Circuit Breakers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95

11.2

UPS Startup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95
11.2.1 Startup Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95
11.2.2 Verify Switching Between Operation Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97

11.3
11.4
11.5
11.6
11.7
11.8
11.9

Partially De-Energize the Liebert Nx 480 with Internal Maintenance Bypass . . . . . . . . . . 98
Partially De-Energize the Liebert Nx 480 with Bypass Distribution Cabinet (BDC) . . . . . 99
De-Energize the Liebert Nx 480 with Bypass Distribution Cabinet (BDC) . . . . . . . . . . . . 100
Energize Nx 480 with Bypass Distribution Cabinet (BDC) . . . . . . . . . . . . . . . . . . . . . . . . . 100
Auto Restart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
Emergency Shutdown With EPO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
Reset After Shutdown for Emergency Stop (EPO Action) or Other Conditions . . . . . . . . . 101

iii

11.10 Battery Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102
11.10.1 Battery Undervoltage Pre-Warning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102
11.10.2 Battery End-of-Discharge (EOD) Protection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102

11.11 Multi-Module System Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102
11.11.1 Isolating One Module in a Multi-Module System. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102
11.11.2 Inserting One Module into a Multi-Module System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104
11.11.3 Shutdown Procedure—Complete UPS and Load Shutdown . . . . . . . . . . . . . . . . . . . . . . . . . 105

11.12 Commissioning a Parallel System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105
11.13 Parallel System Startup. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105

12.0

OPTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106

12.1

Communication and Other User Terminals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106
12.1.1
12.1.2
12.1.3
12.1.4
12.1.5

12.2

Analog Input Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Liebert IntelliSlot Communication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Communication and Monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Configuring Baud Rates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

106
106
106
107
107

LBS Mode—Load Bus Synchronization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109
12.2.1 Remote Alarm Monitor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109

12.3

Replacing Dust Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109

13.0

SPECIFICATIONS AND TECHNICAL DATA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110

13.1
13.2
13.3
13.4

Lug Size and Torque Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cable Lengths: Floor to Connection Point Inside UPS . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cable size and tightening torques . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Battery Run Times . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

110
111
112
114

APPENDIX A - UPS STATUS MESSAGES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117

FIGURES
Figure 1
Figure 2
Figure 3
Figure 4
Figure 5
Figure 6
Figure 7
Figure 8
Figure 9
Figure 10
Figure 11
Figure 12
Figure 13
Figure 14
Figure 15
Figure 16
Figure 17
Figure 18

arrangement—Liebert®

Cabinet
NX™ units and battery cabinets . . . . . . . . . . . . . . . . . . . . . . . .
®
Cabinet arrangement—Liebert NX™ UPS, battery cabinets and Liebert NX bypass
distribution cabinets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Single module block diagram—dual input configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Monitor board U2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Auxiliary terminal block detail (Monitoring Board) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input dry contacts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output dry contacts and EPO wiring for firmware before M170 . . . . . . . . . . . . . . . . . . . . . . . . . .
EPO wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Battery cabinets for Liebert® NX™ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Battery cabinet—details . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Battery tray and supports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Load Bus Synchronization cable connection in single module systems. . . . . . . . . . . . . . . . . . . . .
Load Bus Synchronization cable connection with multi-module systems . . . . . . . . . . . . . . . . . . .
Parallel system block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Paralleling cabinet with input and bypass circuit breakers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Paralleling cabinet with input, bypass and distribution circuit breakers . . . . . . . . . . . . . . . . . . .
Connecting system parallel control cables. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Auxiliary dry contact cables for output breaker in multi-module system . . . . . . . . . . . . . . . . . . .

iv

11
12
14
18
19
20
21
22
24
25
26
28
29
30
31
31
33
34

Figure 19 Connecting EPO push button . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 20 Single input UPS with external Liebert BDC with optional internal transformer—typical
configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 21 Liebert® BDC connection to UPS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 22 Liebert BDC connection to Liebert® NX™ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 23 Bolting a Liebert® NX™UPS to a Liebert BDC™ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 24 Outline drawing, Liebert BDC™, 47" cabinet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 25 Outline drawing, Liebert NX 40-120kVA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 26 Terminal details, 34" battery power pack system for Liebert® NX™ 480V UPS. . . . . . . . . . . . . .
Figure 27 Liebert® NX™ 80-120kVA dimensions—front and left side . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 28 Liebert® NX™ 160-200kVA dimensions—front and left side . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 29 Liebert® NX™ 160-200kVA dimensions—front and left side . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 30 Liebert® NX™ 40-120kVA main components—typical unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 31 Liebert® NX™ 160-200kVA dimensional view—front and left side . . . . . . . . . . . . . . . . . . . . . . . .
Figure 32 Liebert® NX™ 160-200kVA dimensions continued—top and bottom view . . . . . . . . . . . . . . . . . .
Figure 33 Liebert® NX™ 160-200kVA main components—typical unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 34 Liebert® NX™ 40-120kVA cable connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 35 Liebert® NX™ 160-200kVA cable connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 36 Outline drawing, 33" battery power pack system, single cabinet . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 37 Terminal details, 33" battery power pack system, single cabinet Liebert® NX™ . . . . . . . . . . . . .
Figure 38 Outline drawing, 49" battery power pack system, single cabinet . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 39 Terminal details, 49" battery power pack system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 40 Liebert® NX™ 160-200kVA UPS to 49" battery cabinet interconnection . . . . . . . . . . . . . . . . . . .
Figure 41 Liebert® NX™ 40-120kVA UPS to 33" battery cabinet interconnection . . . . . . . . . . . . . . . . . . . .
Figure 42 Outline drawing, Liebert® NX™ 480V 33" parallel cabinet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 43 Outline drawing, Liebert® NX™ 480V 49" parallel cabinet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 44 Liebert® NX™ 480V paralleling cabinet with input and bypass circuit breakers, main
components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 45 Liebert® NX™ 480V paralleling cabinet main components—input, bypass and distribution
circuit breaker configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 46 Main component location drawing Liebert® NX™ 480V, CB2, CB3, CB4 configurations . . . . . .
Figure 47 Liebert® NX™ 480V 40-120kVA UPS to Paralleling Cabinet
Interconnection—Configuration BB0, FB0, KB0 parallel connection to Liebert NX . . . . . . . . . .
Figure 48 Interconnecting details for Liebert® NX™ 40-120kVA UPS to paralleling cabinet with
input, bypass and distribution circuit breakers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 49 Lineup detail—Configuration CB2, CB3, CB4 parallel connection to Liebert® NX™. . . . . . . . . .
Figure 50 Line-up detail, bolt together description, 40-120 kVA Liebert® NX™ . . . . . . . . . . . . . . . . . . . . . .
Figure 51 Single module block diagram (dual input configuration) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 52 Overview of control panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 53 Detailed view of control panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 54 Mimic display indicators location. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 55 Location of control buttons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 56 Buzzer location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 57 Sections of the LCD. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 58 Menu tree . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 59 Language selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 60 Set date and time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 61 Current status and history log records . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 62 Opening display. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 63 Default screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

v

35
41
44
45
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
80
80
81
82
83
83
86
88
89
90
91
91

Figure 64
Figure 65
Figure 66
Figure 67
Figure 68
Figure 69
Figure 70
Figure 71

Help screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92
Screen saver window. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92
Circuit breakers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95
Typical parallel system block diagram with common input supply, with separate batteries
and optional output / bypass distribution panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103
Monitoring board (U2) auxiliary terminal block detail. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106
Liebert® IntelliSlot™ Web card display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108
MultiPort 4 card pin assignment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109
Dust filter replacement. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109

Table 1
Table 2
Table 3
Table 4
Table 5
Table 6
Table 7
Table 8
Table 9
Table 10
Table 11
Table 12
Table 13
Table 14
Table 15
Table 16
Table 17
Table 18
Table 19
Table 20
Table 21
Table 22
Table 23
Table 24
Table 25
Table 26
Table 27
Table 28
Table 29
Table 30
Table 31
Table 32
Table 33
Table 34
Table 35
Table 36
Table 37
Table 38
Table 39
Table 40

Input dry contacts at X3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Maintenance bypass cabinet interface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
BCB control interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Output dry contact relays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
EPO input contact relays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Environmental characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
UPS mechanical characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
UPS terminal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Rectifier input power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Input voltage window with derating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Liebert-approved replacement batteries . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
DC intermediate circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Inverter output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Bypass input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Power cable size selection (Copper Wire Only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Control wiring for Liebert® NX™ UPS to Liebert BDC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Circuit breaker schedule - Main circuit breaker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Main panelboard circuit breaker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Panelboard branch circuit breaker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Subfeed circuit breaker. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Square D I-Line panelboard circuit breaker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Weights, Liebert NX 40-120kVA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Battery cabinet ground . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Battery cabinet circuit breaker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
UPS terminal specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Electrical specifications, Liebert NX 160-200kVA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
Mimic display status indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
Control buttons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
Icons for navigation keys . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84
Description of items in UPS system window . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84
Descriptions of UPS menus and data window items . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
UPS operating modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
Liebert® NX™ communication options. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107
Torque specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110
Battery torque rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110
Distance to connection points on the Liebert NX UPS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111
Parallel system current table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111
External cabinet dimensions, including side panels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112
Cable size tightening torque at Liebert® NX™ 40kVA UPS terminals . . . . . . . . . . . . . . . . . . . . 112
Cable size tightening torque at Liebert NX 60kVA UPS terminals. . . . . . . . . . . . . . . . . . . . . . . 112

TABLES

vi

Table 41
Table 42
Table 43
Table 44
Table 45
Table 46
Table 47
Table 48
Table 49

Cable size tightening torque at Liebert NX 80kVA UPS terminals. . . . . . . . . . . . . . . . . . . . . . .
Cable size tightening torque at Liebert® NX™ 100kVA UPS terminals . . . . . . . . . . . . . . . . . . .
Cable size tightening torque at Liebert NX 120kVA UPS terminals. . . . . . . . . . . . . . . . . . . . . .
Cable size tightening torque at Liebert NX 160kVA UPS terminals. . . . . . . . . . . . . . . . . . . . . .
Cable size tightening torque at Liebert NX 200kVA UPS terminals. . . . . . . . . . . . . . . . . . . . . .
Cable size tightening torque at Liebert NX 480V Battery Cabinet DC input bus terminals. . .
Enersys battery run times in minutes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
C&D Dynasty battery run times in minutes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
UPS status messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

vii

112
113
113
113
113
113
114
115
117

viii

IMPORTANT SAFETY INSTRUCTIONS

SAVE THESE INSTRUCTIONS
This manual contains important instructions that should be followed during installation of your
Liebert® NX™ UPS and ancillary equipment.
Read this manual thoroughly, paying special attention to the sections that apply to your installation,
before working with the UPS. Retain this manual for use by installing personnel.

! WARNING
Risk of heavy unit tipping over. Can cause property damage, injury and death.
Exercise extreme care when handling UPS cabinets to avoid equipment damage or injury to
personnel. The UPS module weight ranges from 1180 to 2205 lb. (535 to 1000kg).
Determine unit weight and locate center of gravity symbols
before handling the UPS. Test lift and balance the cabinet
before transporting. Never tilt equipment more than 15 degrees from vertical.
Battery manufacturers supply details of the necessary precautions to be observed when
working on, or in the vicinity of, a large bank of battery cells. These precautions should be
followed implicitly at all times.
Follow all battery safety precautions when installing, charging or servicing batteries. In
addition to the hazard of electric shock, gas produced by batteries can be explosive and
sulfuric acid can cause severe burns. When connected, the nominal battery voltage is 480VDC
and is potentially lethal.
In case of fire involving electrical equipment, use only carbon dioxide fire extinguishers or
those approved for use in fighting electrical fires.
Extreme caution is required when performing maintenance. Be constantly aware that the
UPS system contains high DC as well as AC voltages.
Check for voltage with both AC and DC voltmeters prior to making contact.

! WARNING
Risk of electric shock. Can cause injury and death.
Dangerous voltages are present within the UPS and battery enclosure. The risk of contact
with these voltages is minimized as the live component parts are housed behind a hinged,
lockable door. Further internal safety screens make the equipment protected to IP20
standards.
No risk exists to any personnel when operating the equipment in the normal manner,
following the recommended operating procedures.
All equipment maintenance and servicing procedures involve internal access and should be
carried out only by trained personnel.

! WARNING
Risk of electric shock from high leakage current. Can cause injury, property damage and
death.

High ground leakage current: Ground connection is essential before connecting the input
supply.
This equipment must be grounded in accordance with local electrical codes.
Maximum load must not exceed that shown on the UPS rating label.

1

! WARNING
Risk of electric shock. Can cause injury and death.
Under typical operation and with all UPS doors closed, only normal safety precautions are
necessary. The area around the UPS system should be kept free of puddles of water, excess
moisture and debris.
Special safety precautions are required for procedures involving handling, installation and
maintenance of the UPS system and the batteries. Observe all safety precautions in this
manual before handling or installing the UPS system. Observe all precautions in this manual,
before as well as during performance of all maintenance procedures. Observe all battery
safety precautions before working on or near the battery.
This equipment contains several circuits that are energized with high voltage. Only
test equipment designed for troubleshooting should be used. This is particularly true for
oscilloscopes. Always check with an AC and DC voltmeter to ensure safety before making
contact or using tools. Even when the power is turned Off, dangerously high electric charges
may exist within the UPS.
All power and control wiring should be installed by a qualified electrician. All power
and control wiring must comply with the NEC and applicable local codes.
ONLY qualified service personnel should perform maintenance on the UPS system.
When performing maintenance with any part of the equipment under power, service
personnel and test equipment should be standing on rubber mats. The service personnel
should wear insulating shoes for isolation from direct contact with the floor (earth ground).
Never work alone, even if all power is removed from the equipment. A second person should
be standing by to assist and summon help in case an accident should occur.

! CAUTION
This equipment is fitted with RFI suppression filters.
Ground leakage current exceeds 3.5 mA and is less than 30 mA.
Transient and steady-state ground leakage currents, which may occur when starting the
equipment, should be taken into account when selecting instantaneous residual current
circuit breakers (RCCBs) or residual current devices (RCDs).
RCCBs must be selected sensitive to DC unidirectional pulses (Class A) and insensitive to
transient current pulses.
Note also that the ground leakage currents of the load will be carried by this RCCB or RCD.

NOTICE
Risk of improper improper electromagnetic shielding. Can cause radio communication
interference.
This unit complies with the limits for a Class A digital device, pursuant to Part 15 Subpart J
of the FCC rules. These limits provide reasonable protection against harmful interference in a
commercial environment. This unit generates, uses and radiates radio frequency energy and,
if not installed and used in accordance with this instruction manual, may cause harmful
interference to radio communications. This unit is not designed for use in a residential area.
Operation of this unit in a residential area may cause harmful interference that the user must
correct at his own expense.

2

Battery Cabinet Precautions
The following warning applies to all battery cabinets supplied with UPS systems. Additional
warnings and cautions applicable to battery cabinets may be found in 4.0 - Battery Installation.

WARNING

Risk of electric shock. Can cause injury, property damage and death.
Special care should be taken when working with the batteries associated with this equipment.
Batteries are always live. Battery terminal voltage will exceed 480VDC and is potentially
lethal.
In addition to the hazard of electric shock, gas produced by batteries can be explosive and
sulfuric acid can cause severe burns.
Batteries should be installed, serviced and replaced only by properly trained and qualified
service personnel trained in safe battery handling methods and who have the correct PPE
(Personal Protection Equipment) and tools.
The following precautions should be observed when working with the batteries:
•
•
•
•
•
•
•
•
•
•

Eye protection should be worn to prevent injury from electrical arcs.
Remove rings, watches and all other metal objects.
Use only tools with insulated handles.
Wear rubber gloves and boots.
When replacing batteries, replace them with the same type and number of batteries or battery packs.
Do not dispose of batteries in a fire. The batteries may explode.
Do not open or mutilate batteries. Released electrolyte is harmful to the skin and eyes. It is
toxic.
Never lay metal objects of any type on top of the batteries.
Disconnect the charging source before connecting or disconnecting battery terminals.
Determine whether the battery is grounded. If the battery is grounded, remove source of
the ground. Contact with any part of a grounded battery can result in electrical shock. The
likelihood of such shock can be reduced if such grounds are removed during installation and
maintenance.

! WARNING
Risk of heavy unit tipping. Can cause property damage, injury and death.
Internal battery strapping must be verified by manufacturer prior to moving a battery cabinet
(after initial installation).
• Battery cabinets contain non-spillable batteries.
• Keep units upright.
• Do not stack.
• Do not tilt.
Failure to heed this warning could result in smoke, fire or electric hazard.
Call 1-800-LIEBERT before moving battery cabinets (after initial installation).

! WARNING
Risk of electric shock. Can cause injury and death.
The Liebert® NX’s internal batteries are connected and energized even if the UPS is turned
Off. To minimize the risk of injury, a properly trained and qualified service person should
disconnect the batteries before any maintenance is performed on the unit.
Servicing of batteries should be performed or supervised only by properly trained and
qualified personnel knowledgeable about batteries and the required precautions.
When replacing batteries, replace with the same manufacturer and type, or equivalent. See
your local Emerson® representative for a list of approved batteries.

3

! CAUTION
Risk of replacing battery with an incorrect type. Can cause property damage injury and
death.

Dispose of used batteries according to the instructions.
When replacing batteries, replace with the same manufacturer and type, or equivalent. See
your local Emerson representative for a list of approved batteries.

4

GLOSSARY OF SYMBOLS
Risk of electrical shock

!

Indicates caution followed by important instructions

AC input

AC output

i
-

Requests the user to consult the manual

+

Indicates the unit contains a valve-regulated lead acid battery

PbH2SO4

R

Recycle

DC voltage

Equipment grounding conductor

Bonded to ground

AC voltage

5

Introduction

1.0

INTRODUCTION
The Liebert® NX™ Uninterruptible Power Supply system provides continuous, high-quality AC power
to your business-critical equipment, such as telecommunications and data processing equipment.
The Liebert NX UPS is a SmartAisle™ technology, appropriate for use with the SmartAisle design
approach.
The Liebert NX supplies power that is free of the disturbances and variations in voltage and
frequency common to utility power, which is subject to brownouts, blackouts, surges and sags.
The Liebert NX utilizes the latest in high-frequency, double-conversion pulse width modulation
technology and fully digital controls to enhance its reliability and increase the ease of use.

6

Installation

2.0

INSTALLATION
This section describes the Liebert® NX™ environmental requirements and mechanical considerations
that must be taken into account when planning the positioning and cabling of the UPS equipment.
Because every site is unique, this section presents a guide to general procedures and practices that
should be observed by the installing engineer, rather than step-by-step installation instructions.

! WARNING
Do not apply electrical power to the UPS equipment before the arrival of the commissioning
engineer.

! WARNING
The UPS equipment should be installed by a qualified engineer in accordance with the
information contained in this section.

! WARNING
Risk of electric shock. Can cause injury and death.
Special care should be taken when working with the batteries associated with this equipment.
When connected together, the nominal battery voltage is 480VDC and is potentially lethal.
• Eye protection should be worn to prevent injury from accidental electrical arcs.
• Remove rings, watches and all other metal objects.
• Use only tools with insulated handles.
• Wear rubber gloves.
If a battery leaks electrolyte or is otherwise physically damaged, it must be replaced, stored in
a container resistant to sulfuric acid and disposed of in accordance with local regulations.
If electrolyte comes into contact with skin, the affected area should be washed immediately
with large amounts of water.
NOTE
The Liebert NX UPS can be used in TN utility system.

2.1

External Inspections
1. While the UPS system is still on the truck, inspect the equipment and shipping container(s) for
any signs of damage or mishandling. Do not attempt to install the system if damage is apparent.
If any damage is noted, file a damage claim with the shipping agency within 24 hours and contact
Emerson Network Power® Liebert Services at 1-800-LIEBERT to inform them of the damage
claim and the condition of the equipment.
2. Compare the contents of the shipment with the bill of lading. Report any missing items to the
carrier and your local Liebert representative immediately.

2.2

Internal Inspections
1. Remove any packaging material, then visually examine the UPS and battery equipment for
transit damage, both internally and externally. Report any such damage to the shipper and to
Liebert immediately.
2. Check the nameplate inside the cabinet door to verify that the model number and rating
correspond to the ones specified. Record the model number and serial number in the front of this
installation manual. This information is necessary should service be required.
3. Check for loose connections or unsecured components in the cabinet.
4. Check for shipping damage to internal components.

7

Installation

2.2.1

Storing for Delayed Installation
If the equipment will not be installed immediately, it must be stored indoors where the humidity is no
higher than 90% and the temperature is no higher than 104°F (40°C). The storage area must protect
the Liebert® NX™ from excessive moisture (see 6.2 - UPS Environmental).
NOTE
If the battery cabinet must remain disconnected from power for more than six (6) months, the
battery must be recharged before use. To charge the batteries, the battery cabinet must be
connected to the Liebert NX UPS and the UPS must be connected to utility power and started
up because the charger operates only while the Liebert NX UPS is operating
NOTE
When batteries are installed in a cabinet adjacent to the UPS unit, the battery—not the
UPS—dictates the designed maximum ambient operating temperature.

2.3

Preliminary Checks

2.3.1

Identification
The equipment supplied has an identification tag on the back of the main door listing the type and
size of the UPS.

2.4

UPS Location

2.4.1

Positioning the UPS
Choose a location for the UPS that offers:
•
•
•
•
•
•
•

2.4.2

Easy connection to inputs, outputs and auxiliary equipment
Enough space to service the UPS
Air circulation sufficient to expel heat produced by UPS
Protection against moisture and excessive humidity
Protection against dust and other particulate matter
Compliance with fire prevention regulations and practices
Operating environment temperature of 74-80°F (23-27°C) for maximum battery efficiency

Environmental Considerations
Before installing the Liebert NX, verify that the UPS room satisfies the environmental conditions
stipulated in 6.2 - UPS Environmental, paying particular attention to the ambient temperature
and air exchange system.
The UPS unit should be installed in a cool, dry, clean-air environment with adequate ventilation to
keep the ambient temperature within the specified operating range 32°F to 104°F (0°C to 40°C).
For optimal UPS and battery system performance and service life, maintain the operating
temperature within the range of 74-80°F, (23-27°C).
The Liebert NX UPS cooled by internal fans. Cooling air enters the unit through the front of the unit
and is exhausted out the top. To permit proper air flow and prevent overheating, do NOT block or
cover the ventilation openings or blow air down onto the unit. Ventilation clearance above the unit
must be a minimum of 8 in. (203mm).
See Table 7 for details on heat dissipation.

8

Installation

Battery Location
Batteries must be installed in Liebert® NX™ 480V battery cabinets or battery room. Temperature is a
major factor in determining battery life and capacity. Battery manufacturers recommend an
operating temperature of 77°F (25°C). Ambient temperatures higher than this reduce battery life;
temperatures lower than this reduce battery capacity. In a typical installation, battery temperature
should be maintained between 74°F and 80°F (23-27°C). Batteries should be placed where there are
no main heat sources or air inlets to prevent portions of batteries from being either much warmer or
much cooler than other parts of the batteries.

2.4.3

Special Considerations for Parallel Systems
1. Consider the grounding configuration of your system before finalizing module placement. For
optimal ground performance, the Liebert NX modules should be close together.
2. For optimal load-sharing performance, the UPS output cables should be approximately the same
length, plus or minus 20 percent.
3. Position modules in such a way as to minimize the length of power cables and control wiring
between UPS modules and the paralleling cabinet.

2.5

Considerations in Moving the Liebert NX
Ensure that the UPS weight is within the designated surface weight loading (lb./ft2 or kg/cm2) of any
handling equipment. See Table 7 for weights of various units.
To move the UPS and optional battery cabinets:
• The Liebert NX may be rolled on its casters when moving the unit a short distance. For longer distances, move the UPS with a forklift or similar equipment to ease the relocation and to reduce
vibration.
The optional battery cabinets should be moved with a forklift or similar equipment.

! WARNING
Risk of heavy unit falling. Can cause property damage, injury and death.
Ensure that any equipment that will be used to move the Liebert NX has sufficient lifting
capacity. The Liebert NX weight ranges from 1180 to 2201 lb. (535 to 1000kg). See Table 7 for
details. The UPS presents a tipping hazard. Do not tilt the Liebert NX further than 15
degrees from vertical.
The UPS is fitted with casters—take care to prevent movement when unbolting the
equipment from its shipping pallet. Ensure adequate personnel and lifting equipment are
available when taking the Liebert NX off its shipping pallet. Do not tilt the unit more than 15
degrees from center.

! WARNING
Risk of heavy unit falling. Can cause property damage, injury and death.
The casters are strong enough for movement across even surfaces only. Casters may fail if
they are subjected to shock loading, such as being dropped or rolled over holes in the floor or
obstructions. Such failure may cause the unit to tip over, injuring personnel and damaging
the equipment.
Care must be taken when maneuvering cabinets fitted with batteries. Keep such moves to a
minimum. For further information, see Battery Cabinet Precautions on page 3.

Final Position
When the equipment has been finally positioned, ensure that the adjustable stops are set so that the
UPS will remain stationary and stable (see 8.0 - Installation Drawings).

9

Installation

2.6

Mechanical Considerations
The Liebert NX is constructed with a steel frame and removable panels. Top and side panels are
secured to the chassis by screws. The doors may be opened for access to power connections bars,
auxiliary terminal blocks and power switches.
The UPS comes with an operator control panel, which provides basic operational status and alarm
information. Cooling is provided by internal fans. The unit sits on four casters. Adjustable stops are
provided to prevent the UPS from moving once it has been moved to its final position.

2.6.1

Clearances
There are no ventilation grilles on the sides or rear of the UPS. The unit may be placed with the rear
against a wall and optional cabinets on either side.
To enable routine tightening of power terminations within the UPS, make sure there is sufficient
clearance in front of the Liebert® NX™ to permit free passage of personnel with the door fully opened.
Leave a minimum of 8 in. (203mm) between the top of the UPS and the ceiling to permit adequate air
circulation above the unit. Liebert recommends against using air conditioning or other systems that
blow air onto the top of the unit.

2.6.2

Floor Installation
The diagrams in 8.0 - Installation Drawings show the location of holes in the base plate for bolting
the equipment to the floor.
If the equipment is to be placed on a raised floor, it should be mounted on a pedestal that will support
the equipment point loading. Refer to the cabinet-bottom views in 8.0 - Installation Drawings to
design this pedestal.

2.6.3

Cable Entry
Cables can enter the Liebert NX from the top or bottom. Cable entry is made possible by removing a
metal plate attached to the UPS.
These plates are designed to allow the personnel to punch holes for fitting and securing the conduit.
Once the conduit holes are punched, these plates should be reattached to the UPS.

! WARNING
Risk of explosion and fire. Can cause property damage, injury and death.
To reduce the risk of fire, connect only to a circuit provided with correct amperes maximum
branch circuit overcurrent protection (see Table 8) in accordance with the National Electric
Code, ANSI/NFPA 70.
NOTE
When installing the UPS, the customer must provide a disconnect with overcurrent protection
at the output of the UPS.

System Composition
A UPS system can comprise a number of equipment cabinets, depending on the individual system
design requirements—e.g., UPS cabinet with External Bypass cabinet and Maintenance Bypass
cabinet. In general, all cabinets used will be the same height and are designed to be positioned sideby-side to form an aesthetically appealing equipment suite.

10

Installation

2.6.4

Optional Cabinets
The Maintenance Bypass Cabinet must be cabled and bolted to the Liebert NX before the UPS and
bypass cabinet are moved into their final position. Connect the input wiring to the Maintenance
Bypass Cabinet ONLY after the units are connected and positioned.
Battery cabinets may be bolted to either side of the Liebert NX; see Figure 1.

Figure 1

Cabinet arrangement—Liebert® NX™ units and battery cabinets

Liebert
NX
UPS

Battery
Cabinet

Battery
Cabinet

Front of Units

Battery
Cabinet

Battery
Cabinet

Battery
Cabinet

Liebert
NX
UPS

Front of Units

Liebert
NX
UPS

Liebert
NX
UPS

Front of Units

Battery
Cabinet

Liebert
NX
UPS

Battery
Cabinet

Battery
Cabinet

Battery
Cabinet

Battery
Cabinet

Front of Units

Liebert
NX
UPS

Multi-Module
Parallel Cabinet

Front of Units

11

Liebert
NX
UPS

Battery
Cabinet

Liebert
NX
UPS

Battery
Cabinet

Installation

Figure 2

Cabinet arrangement—Liebert® NX™ UPS, battery cabinets and Liebert NX bypass distribution
cabinets

Battery
Cabinet

Liebert
NX
UPS

Liebert NX
Bypass
Distribution
Cabinet

Front of Units

Battery
Cabinet

Battery
Cabinet

Battery
Cabinet

Front of Units

12

Liebert
NX
UPS

Liebert NX
Bypass
Distribution
Cabinet

Electrical Connections

3.0

ELECTRICAL CONNECTIONS
The UPS requires both power and control cabling once it has been mechanically installed. All control
cables must run separate from power cables in metal conduits or metal ducts that are electrically
bonded to the metalwork of the cabinets to which they are connected.

! WARNING
Risk of electrical shock. Can cause injury and death.
Before connecting input power to the Liebert® NX™, ensure that you are aware of the location
and operation of the overcurrent protection devices that connect the UPS input/bypass supply
to the power distribution panel.
De-energize and lockout or tagout all incoming high- and low-voltage power circuits before
installing cables or making any electrical connections.

3.1

Power Cabling

3.1.1

Cable Rating
The main factors affecting the choice and size of cable are voltage, current (also taking into account
overcurrent), room temperature and conditions of installation of the cable.
The power cables of the system must be sized with respect to the following description:
• UPS input cables - The UPS input cables must be sized for the maximum input current, including the maximum battery recharge current, given in Table 8, with respect to the unit rating and
the input AC voltage.
• UPS bypass and output cables - The bypass and output cables must be sized for the nominal
output current, given in Table 8, with respect to the unit rating and the output AC voltage.
• Battery cables - When connecting an external battery cabinet, the battery cables must be sized
for the battery discharge current at the end-of-discharge voltage, as given in Table 8, with
respect to the unit rating.
NOTE
Table 8 gives nominal currents for determining the size of UPS power cables. Other important
factors to consider include cable route length and coordination with protective devices.
The power cables can be sized to suit the UPS unit rating according to Table 8.
NOTE
When installing a Liebert NX with Softscale™ capability Liebert recommends sizing the input,
bypass and output cabling for the UPS’s maximum rating. Properly sizing the cable will
reduce the work required to upgrade the UPS.

Lug Size and Torque Requirements
Refer to Table 34 for lug size and torque requirements.

13

Electrical Connections

3.1.2

UPS Input Configuration
Figure 3 illustrates the Liebert® NX™ in a split bypass (dual-input) configuration. In this
configuration, the Static Bypass and the Maintenance Bypass lines are supplied from a separate feed
from the Main input. Both sources must be protected externally with properly sized protective
devices. By default, the unit ships with internal links installed between the bypass input and main
input (Single Input configuration). To wire the unit as a dual input UPS, remove the links and wire
the bypass to the input bus bars, then wire the main input directly to CB1 (see Figure 3).

Figure 3

Single module block diagram—dual input configuration
3-Phase
3W + Gnd

Internal Maintenance Bypass

3-Phase
3W + Gnd

Static Bypass

Rectifier

AC Input

Inverter

3-Phase
3W + Gnd
AC Output

Converter

UPS Cabinet
2W + Gnd

Battery Cabinet

3.1.3

Cabling Guidelines
The following are guidelines only and are superseded by local regulations and codes of practice where
applicable. Use wiring rated at 75°C or greater.
1. The ground conductor should be sized in accordance with the input overcurrent protection device
data in Table 8. The ground cable connecting the UPS to the main ground system must follow the
most direct route possible. Control wiring and power wiring must be run in separate conduit.
Output and input cables must be run in separate conduit.
2. Consider using paralleled smaller cables for heavy currents—this can ease installation.
3. When sizing battery cables, a maximum voltage drop of 4VDC is permissible at the current
ratings in UPS terminal. For terminal connection sizing, see Table 8.
4. In most installations, especially parallel multi-module systems, the load equipment is connected
to a distribution network of individually protected busbars fed by the UPS output, rather than
connected directly to the UPS itself. When this is the case, the UPS output cables can be rated to
suit the individual distribution network demands rather than being fully load-rated.
NOTE
If more load is added to the distribution panel, the unit’s cabling must be resized.
5. When laying power cables, do not form coils; this will help avoid increasing formation of
electromagnetic interference.
14

Electrical Connections

3.1.4

Cable Connections
The rectifier input, bypass and output are easily accessible from the front of the unit for installation.
All require lug type terminations. They are connected to busbars on the front side of the Liebert® NX™
and below the circuit breaker, as shown in Figure 3. These busbars are accessible when the front
side panel is removed. Busbars to connect external batteries are accessible from the front of the UPS.
NOTE
External connection access requires removal of a protective panel on the lower front of the UPS.
NOTE

There is no battery fuse in the UPS; the battery cabinet must include a circuit breaker
to cut off the current in case of short circuit. Refer to Table 8 for current ratings.

3.1.5

Safety Ground
The safety ground busbar is located below the Maintenance Bypass circuit breaker or to the right of
the UPS Output breaker for 160-200KVA models as shown in Figure 3. The safety ground cable must
be connected to the ground busbar and bonded to each cabinet in the system.
All cabinets and cable conduit should be grounded in accordance with local regulations.

! WARNING
Risk of electrical shock from ground fault. Can cause injury and death.
Failure to follow proper grounding procedures can result in electric shock hazard to personnel
or the risk of fire, should a ground fault occur.
NOTE
Proper grounding significantly reduces electromagnetic interference problems in systems.
NOTE
The ground busbar is easily accessible when the lower protective cover plate is removed.

3.1.6

Protective Devices
For safety, it is necessary to install circuit breakers in the input AC supply and external battery
battery cabinets, external to the UPS system. Given that every installation has its own
characteristics, this section provides guidelines for qualified installation engineers with knowledge of
operating practices, regulatory standards and the equipment to be installed.

UPS Rectifier and Bypass Input Supply
• Protection from excessive overcurrents and short circuits in power supply input
External overcurrent protection for the AC output circuit is to be provided. See 6.4 - UPS
Electrical Characteristics and Table 9 for overload capacity.
When an external battery supply not made by Liebert is used, the customer must provide
overcurrent protection for the battery circuit.
• Dual Input
When wiring the UPS with dual inputs, the Rectifier input and the Bypass input must be
protected separately. Size the breakers according to the input currents shown in Table 8.

15

Electrical Connections

3.1.7

Cabling Procedure

NOTICE
Risk of improper installation. Can cause improper operation and void warranty.
The operations described in this section must be performed by authorized electricians or
qualified technical personnel. If you have any difficulties, contact your local Liebert®
representative or Liebert Services.
NOTE
Hydraulic pressure pliers, combinative tools and piston ring pliers should be used to connect
AC wiring.
Once the equipment has been positioned and secured for operation, and the battery and ground
collars have been connected (see 3.1.4 - Cable Connections), connect the power cables as described
below. (Study the reference drawing in 8.0 - Installation Drawings.)
1. Verify that all incoming high and low voltage power circuits are de-energized and locked out or
tagged out before installing cables or making any electrical connections.
2. Remove the front protective cover to gain easier access to the connections busbars.
3. Connect the safety ground and bonding ground bus cables to the copper ground busbar located on
the bottom of the equipment below the power connections. All cabinets in the UPS system must be
connected to the user’s ground connection.
NOTE
The grounding bonding arrangement must comply with the National Electrical Code and all
applicable local codes.
4. Identify and make power connections with incoming cables according to Steps 5 through 11.

Common Input Connections
5. For common bypass and rectifier inputs, connect the AC input supply cables between the power
distribution panel and the UPS input busbars (A-B-C terminals) and tighten the connections to
88 lb-in. (10 N-m) using the M8 bolt provided.

Dual Input Connections
6. Remove the internal links installed between the Input circuit breaker (CB1) busbars and Bypass
Input busbars as shown in Figure 3.
7. For the bypass, connect the AC input supply cables between the power distribution panel and the
UPS Rectifier Input busbars (CB1 A-B-C terminals) and tighten the connections to 88 lb-in.
(10 N-m) using the M8 bolt provided.
8. For the Rectifier Input, connect AC input supply cables between the power distribution panel and
the UPS Rectifier Input busbars (CB1 A-B-C terminals).

16

Electrical Connections

NOTE
Both the rectifier and bypass feeds must come from the same utility source. The UPS can be
powered from separate sources provided all the following conditions are met:
1. The transformers are delta/wye isolation transformers where the wye secondary’s are
connected to the NX 480V UPS.
2. The individual transformer used to supply the Bypass of the NX 480V is solidly bonded to
earth ground at the transformer.
3. The individual transformer used to supply the Input (rectifier) of the NX 480V is solidly
bonded to earth ground at the transformer.
4. There are no appreciable ground currents flowing between the two transformers.
5. No delta/delta (ungrounded or corner grounded) transformers are used as a source to the
NX 480V UPS.
6. No high resistance or low resistance grounds can be used in the neutral bonding path to
ground of the delta/wye isolation transformers described above in Items 2 and 3.
7. All applicable NEC standards and wiring rules are enforced.
8. The internal bypass to input (rectifier) shorting bars in the NX 480V UPS are removed.
The above all apply to single-module systems.
9. For 1+N paralleled system, the Bypass to each unit must be fed from the same utility
source.

Output System Connections—Ensure Correct Phase Rotation
10. Connect the system output cables between the UPS output busbars (A-B-C terminals) and the
critical load and tighten the connections to 88 lb-in. (10 N-m) (M8 bolt).

! WARNING
Risk of electric shock. Can cause injury and death.
If the load equipment will not be ready to accept power on the arrival of the commissioning
engineer, then ensure that the system output cables are safely isolated.
Observe the battery cable polarity. Be sure that the battery connector is made with the
correct polarity.
11. Refit all protective covers removed for cable installation.

Frequency Converter Mode
If a frequency converter configuration is used, connect the AC input supply cables to the rectifier
input busbars (A-B-C terminals). Torque to 88 lb-in (10N-m) for M8 bolts. Ensure correct phase
rotation. There will not be any AC bypass supply cables to the bypass input (A-B-C terminals) and
tighten the connections.
NOTE
The operations described in this section must be performed by authorized electricians or
qualified technical personnel. If any difficulties arise, contact Liebert® at 1-800-LIEBERT.
NOTE
For frequency converter operation, ensure that the linking busbars between the bypass and the
rectifier input are removed.

17

Electrical Connections

3.2

Control Cables

3.2.1

Monitor Board Features
Based on your site’s specific needs, the UPS may require auxiliary connections to manage the battery
system (external battery circuit breaker, battery temperature sensor), communicate with a personal
computer or provide alarm signaling to external devices or for Remote Emergency Power Off (REPO).
The monitor board, arranged for this purpose, is located on the rear of the operator access door. The
main features are:
•
•
•
•
•
•
•

Input and Output dry contacts signal (one pair of contacts of relay)
Emergency Power Off control (EPO)
Environmental parameter input interface
User communication (for data setting and user background monitor)
Liebert® IntelliSlot® interface
Modem interface
Temperature detect interface

Figure 4 shows the relationship and connection between the monitoring (U2) board and other boards
in the UPS.
Figure 4

Monitor board U2

U1
DSP Control

M5
Auxiliary Power

K1
Key & LED Board

U2
Monitor Board

X1
User Interface
Board

18

M3
Parallel Logic
Board

Electrical Connections

Figure 5

Auxiliary terminal block detail (Monitoring Board)
J8
J3

J1

LCD

J22

X7

J23

X6

J12
J9
J2
J15

PWR
MODEM
SNMP CARD

X5

J16
J17
Liebert IntelliSlot 2

J13 J21 J25

J28

J4

Liebert IntelliSlot 1

J26 J30 J10

X4

X4

J24

Liebert IntelliSlot 3

BFP INV ACF
X1

EPO
X2

Dry in

MBC

BCB

NOTE: The black square ()
on each slot indicates Pin 1.

X3

19

Electrical Connections

3.3

Dry Contacts
The UPS provides input dry contacts and output dry contacts.
NOTE

When operating the Liebert® NX™ with dry contacts, ESD measures must be taken or the
contacts may be damaged.

3.3.1

Input Dry Contacts
There are several input dry contacts at the X3 slot.

Figure 6

Input dry contacts
+12V

+12V
+12V

+12V

DRV

FB

GND

OL

FUSE

F_FAN

J10
T_0T

T_IT

AUX_0

J30
AUX_I

GND

BtG

ENV

J26
GEN

+12V

J4

+12V

X3

NOTE: The black square () on each slot indicates Pin 1.

Table 1

Input dry contacts at X3

Position
J4.1
J4.2
J4.3
J4.4

Name
ENV3
BtG
GEN1,2
+12V

Description
Battery Room Alarm (Normally Closed)
Battery Ground Fault Detection (Normally Closed)
Generator Detection (Normally Open)
+12V Power

1 - Must be configured using configuration software before becoming active.
2 - When activated, the charger current can be limited, via software, to a percentage of the full charger current (0-100%).
3 - Activating this feature turns the battery charger off.

3.3.2

Maintenance Bypass Cabinet Interface
J26 and J30 are the MBC interface.
Table 2

Maintenance bypass cabinet interface

Position

Name
1

Description
Input transformer over temperature (N.C.)

J26.1

T_IT

J26.2

AUX_I

Reserved

J26.3

+12V

+12V Power

J26.4

GND

Power Ground

J30.1

FUSE

Reserved

J30.2

F_FAN

Fan Fail Alarm (N.C.)

J30.3

T_OT1

Output Transformer Overtemperature (N.C.)

J30.4

AUX_O

Reserved

1

- Must be configured using configuration software before becoming active.

NOTE
All auxiliary cables of terminal must be double-insulated. The wire must be 600V, 18-16 AWG
stranded for maximum runs between 82 and 197 feet (25-60m), respectively.

20

Electrical Connections

3.3.3

Battery Circuit Breaker Control Interface
J10 is the Battery Circuit Breaker (BCB) box interface.
Table 3

BCB control interface

Position

Name

Description

J10.1

DRV

BCB Driver Signal

J10.2

FB

BCB Contact State

J10.3

GND

J10.4

OL

Power Ground
BCB On-Line - Input - This pin will become active when
BCB interface is connected. (N.O.)

NOTE
All auxiliary cables of terminal must be double-insulated. The wire must be 600V, 18-16 AWG
stranded for maximum runs between 82 and 197 feet (25-60m), respectively.

3.3.4

Output Dry Contacts
There are three output dry contact relays at the X1 slot (see Figure 7 and Table 4).
Output dry contacts and EPO wiring for firmware before M170

NOTE: The black square on each slot

Table 4

ACF_O

ACF_S

ACF_C

J25
INV_O

INV_C

J21
BFP_O

BFP_C

J13

INV_S

X1

BFP_S

Figure 7

indicates Pin 1.

Output dry contact relays

Position

Name

Description

J13.2

BFP_O

Bypass feedback protection relay. Normally open. Closed when bypass SCR is
shorted;. 5A, 250VAC/24 VDC

J13.3

BFP_S

Bypass feedback protection relay center; 5A, 250VAC/24 VDC

J13.4

BFP_C

Bypass feedback protection relay. Normally closed. Open when bypass SCR is shorted;
5A, 250VAC/24 VDC

J21.2

INV_O

Inverter mode relay. Normally open. Closed when UPS is in inverter mode.; 5A,
250VAC/24 VDC

J21.3

INV_S

Inverter mode relay center; 5A, 250VAC/24 VDC

J21.4

INV_C

Inverter mode relay. Normally closed. Open when UPS is in inverter mode;
5A, 250VAC/24 VDC

J25.2

ACF_O

Main input fault relay. Normally open. Closed when main input is in fault;
5A, 250VAC/24 VDC

J25.3

ACF_S

Main input fault relay center; 5A, 250VAC/24 VDC

J25.4

ACF_C

Main input fault relay. Normally closed. Open when main input is in fault;
5A, 250VAC/24 VDC

NOTE
All auxiliary cables of terminal must be double-insulated. The wire must be 600V, 18-16 AWG
stranded for maximum runs between 82 and 197 feet (25-60m), respectively.

21

Electrical Connections

3.3.5

EPO Input—Optional
The UPS has an Emergency Power Off (EPO) function operated by a button on the control panel or by
a remote contact provided by the user. The local EPO button is under a hinged, clear plastic shield.
The X2 slot, shown in Figure 8, is the remote EPO input interface. The EPO has a NO/NC contact
point that becomes active when shorting terminals X2: 3 and 4 or open terminal connection
X2: 2 and 1.
If an external Emergency Stop facility is required, it is connected terminals X2: 1 and 2 or X2: 3 and 4
of the auxiliary terminal block (X2). It also is connected to the Normally Open or Normally Closed
remote stop switch between these two terminals using shielded cable (see Figure 8 and Table 5). If
this function is not used, terminals X2: 3 and 4 must be opened and X2: 1 and 2 must be closed.

Figure 8

EPO wiring
X2

J28

EPO - NO

Table 5

EPO - NC

NOTE: The black square

indicates Pin 1.

EPO input contact relays

Position

Name

Description

J28.1

EPO_NC

EPO Activated when opened to J28.2

J28.2

EPO_NC

EPO Activated when opened to J28.1

J28.3

EPO_NO

EPO Activated when shorted to J28.4

J28.4

EPO_NO

EPO Activated when shorted to J28.3

NOTE
The Emergency Stop action within the UPS shuts down the rectifier, inverter and static
bypass. It does not internally disconnect the input power supply. To disconnect ALL power to
the UPS, open the upstream feeder breaker(s) when the remote EPO is activated.
NOTE
Normally Closed EPO – X2: 1,2, these terminals are supplied factory-linked on the monitor
board and must remain installed if using NO contacts.
NOTE
All auxiliary cables of terminal must be double-insulated. The wire must be 600V, 18-16 AWG
stranded for maximum runs between 82 and 197 feet (25-60m), respectively.

22

Battery Installation

4.0

BATTERY INSTALLATION

4.1

Introduction
If using multiple sets of batteries connected in parallel to provide the required battery backup run
times, fit each set with an isolating device to permit working on one of the battery sets while leaving
the others in service and providing backup protection.
When replacing batteries, replace with the same manufacturer and type, or equivalent. See your
Liebert® representative for a list of approved batteries.

4.2

Safety
Special care should be taken when working with the batteries associated with the Liebert NX™
system equipment. When all batteries are connected together, the battery terminal voltage may
exceed 480V and is POTENTIALLY LETHAL.

WARNING

Risk of electric shock. Can cause injury, property damage and death.
Special care should be taken when working with the batteries associated with this equipment.
Batteries are always live. Battery terminal voltage will exceed 480VDC and is potentially
lethal.
In addition to the hazard of electric shock, gas produced by batteries can be explosive and
sulfuric acid can cause severe burns.
Batteries should be installed, serviced and replaced only by properly trained and qualified
service personnel trained in safe battery handling methods and who have the correct PPE
(Personal Protection Equipment) and tools.
The following precautions should be observed when working with the batteries:
•
•
•
•
•
•
•
•
•
•

Eye protection should be worn to prevent injury from electrical arcs.
Remove rings, watches and all other metal objects.
Use only tools with insulated handles.
Wear rubber gloves and boots.
When replacing batteries, replace them with the same type and number of batteries or battery packs.
Do not dispose of batteries in a fire. The batteries may explode.
Do not open or mutilate batteries. Released electrolyte is harmful to the skin and eyes. It is
toxic.
Never lay metal objects of any type on top of the batteries.
Disconnect the charging source before connecting or disconnecting battery terminals.
Determine whether the battery is grounded. If the battery is grounded, remove source of
the ground. Contact with any part of a grounded battery can result in electrical shock. The
likelihood of such shock can be reduced if such grounds are removed during installation and
maintenance.

! CAUTION
Risk of explosion and fire. Can cause property damage, injury and death.
To reduce the risk of fire, connect only to a circuit provided with correct amperes maximum
branch circuit overcurrent protection (see Table 12) in accordance with the National Electric
Code, ANSI/NFPA 70.
NOTE
The maximum available fault current from the battery supply is 8500A and the DC voltage
rating of the battery supply overcurrent protective device that is to be installed near the battery
supply must be at least 600VDC.

23

Battery Installation

4.3

External Battery Cabinet Installation

4.3.1

Battery Cabinets

Figure 9

Battery cabinets for Liebert® NX™
Top Cable Entry
BCB Plate and BCB
Optional Alber BDSi
Data Collection/Load
Module
Optional Alber
BDSi Controller
Module

Battery Trays

Liebert 49" Battery Cabinet
Liebert 33" Battery Cabinet

The same model battery cabinet may be installed in parallel in multiple cabinet striSngs for additional
capacity. Battery run time depends on the cabinet model, the number of cabinets and the load on the UPS.
Handling—The battery cabinet has casters to facilitate movement over short distances. The bottoms
of the battery cabinets are reinforced to permit movement by forklift over longer distances.
Inspection—Remove all panels and visually inspect the batteries, bus connections and cabinet for
any damage. Exercise caution: voltage is present within the battery cabinet even before installation.
If there are signs of damage, do not proceed. Call Liebert Services at 1-800-542-2378.
Storage—The batteries can be stored for up to six months without appreciable deterioration. If
planning to store a battery cabinet for longer than six months or at temperatures higher than 77°F
(25°C), contact Liebert Services for recommended precautions.

! CAUTION
Risk of electrical shock. Can cause injury and death.
Any battery system should be installed by properly trained and qualified personnel.
When installing an external battery cabinet that is NOT a Liebert NX battery cabinet, the customer
must provide overcurrent protection. See Table 8 for sizing of protection devices.
NOTE
When using an external battery supply that is not provided by Liebert, refer to the battery
manufacturer’s installation manual for battery installation and maintenance instructions,
available on the manufacturer’s Web site.
NOTE
When replacing batteries, Liebert recommends that the all batteries in external cabinets be the
same type. See Table 11 for a list of batteries that are approved for use with this product.

24

Battery Installation

4.3.2

Connecting the Batteries
If the Liebert® NX™ battery cabinets are installed on a raised floor, the battery power cables and
circuit breaker control cables may be routed to the UPS cabinet via the floor of the cabinet (bottom
entry).
If the Liebert NX battery cabinets are installed adjacent to one another on a solid floor, these cables
may be passed between the cabinets through lifting slots in the lower sides of the cabinets.
Intertray connections must be made before the battery cabinet can be used.

Figure 10 Battery cabinet—details

Tray Handle

Insulated Post
for Cabling

4.3.3

Installation Considerations
Position— If the system includes a matching maintenance bypass cabinet (MBC), the MBC should
be installed first and the battery cabinet installed on the opposite side of the UPS. Otherwise, leftside placement of the battery cabinet is preferable.
The battery cabinet(s) are designed to be located conveniently next to each UPS module, and are also
available in stand-alone configurations with painted side panels. The front access design eliminates
side and rear service clearance requirements. Refer to Table 38 for battery cabinet dimensions and
weights.
Bolt-On Cabinets—Matching battery cabinets are designed to bolt onto the side of the UPS module
cabinet. Use bolts that ship with each unit to connect cabinet frames at posts, two places in the front
and two places in the rear.
Service Clearance—Allow front access to the battery cabinet at all times for maintenance and
servicing. Electrical codes require that the battery cabinet be installed with no less than 3 feet (1m) of
clearance at the front of the cabinet when operating. Side and rear panels do not require service
clearance.
Cables—Cables may be run between the cabinets through cutouts in the top of the cabinet,
eliminating the need for external conduit runs. Route cables before moving cabinets into final position
for bolting together. No top or bottom entry cables are required, except for remotely located cabinets
which require conduits.
Software—To allow the UPS to accurately display the battery run time, the number of battery
cabinets must be noted when performing initial startup and setup using the configuration software.
This is to be performed by the Liebert Services customer engineer when commissioning the unit.
Casters and Adjustable Stops—The adjustable stops are not designed to bear the full weight of the
cabinet. Lower the stops until they are finger-tight in contact with the floor. Then tighten a small
amount with a wrench (less than two turns) to give a good friction fit. When mounting the battery
cabinet on seismic stands, ensure that the casters are bearing the weight of the cabinet.
Battery Support Tray—Be sure to connect the battery tray support to the front of the cabinet
before sliding a battery tray out for connection or service. Without the support, the battery tray may
fall out of the cabinet. See Figure 11 for details.

25

Battery Installation

Figure 11 Battery tray and supports

Slot in support
secured by screw-in
connector at corner
of battery tray...

4.3.4

... and notched end of
support slips into slot at
top corner of battery
compartment

Connecting the Battery Cabinet to the UPS
After the battery cabinet equipment has been positioned and secured for operation and the batteries
have been connected, connect the power cables as described below.
1. Verify that all incoming high and low voltage power circuits are de-energized and locked out or
tagged out before installing cables or making any electrical connections.
2. Remove the UPS front protective cover to gain access to the equipment ground busbar.
3. Connect the safety ground and any necessary bonding ground cables to the copper ground busbar.
(example: UPS located on the bottom of the equipment below the power connections).
All cabinets in the UPS system must be connected to the user's ground connection.
NOTE
The grounding bonding arrangement must be in accordance with the National Electrical Code
and all applicable local codes.
4. Connect the system battery cables. Be sure that the battery connections are made with the right
polarity, and tighten the connections to 44 lb-in. (5 N-m) (M6 Bolt). Do not close the battery circuit
breaker before the equipment has been commissioned.
5. Connect supplied auxiliary control cable to pins J10.2 and J10.3 on the U2 monitoring board (see
3.3 - Dry Contacts).

4.4

Non-Standard Batteries
When batteries other than a matching battery cabinet are used, a remote battery disconnect switch
with overcurrent protection is required per the National Electrical Code. Contact your local Liebert®
sales representative about this option.
Install battery racks, cabinets and batteries in accordance with the manufacturer's instructions.
Verify that the battery area has adequate ventilation and battery operating temperature complies
with the manufacturer's specifications and with all applicable national and local codes.
If you have any questions concerning batteries, battery racks or accessories, contact Liebert Services
at 1-800-543-2378.

26

Battery Installation

4.5

BCB Shunt Trip
The Liebert NX battery cabinet has the shunt trip installed in the circuit breaker. When a DC ground
fault (using the optional DC Ground Fault kit), a battery overtemperature or EPO is activated, the
shunt trip will open the circuit breaker.
NOTE
The Liebert NX battery Cabinet circuit breaker will not open at the end of a battery discharge.
The UPS will isolate the batteries internally in this situation.

4.6

Alber Monitoring System—Optional
The Liebert® matching battery cabinet allows installing an optional Alber® battery monitoring system
in the cabinet. The Alber Battery Monitoring by Liebert continuously checks all critical battery
parameters, such as cell voltage, overall string voltage, current and temperature. Automatic periodic
tests of internal resistance of each battery will verify the battery’s operating integrity. Additional
capabilities include automatic internal DC resistance tests and trend analysis providing the ability to
analyze performance and aid in troubleshooting.
The Alber monitoring system is installed inside the battery cabinet (see Figure 9). The monitoring
system requires approximately 0.5A, single-phase 480V.
NOTE
This power must be UPS protected.
This power can come from the output terminals of the UPS, a distribution panel, or another
UPS-protected source. This power is to be field supplied. See Figure 37 for wiring location.
For details about operating the Alber system, see the Alber Monitoring System manual.

27

Options

5.0

OPTIONS

5.1

Load Bus Synchronization
The Load Bus Synchronizer (LBS) keeps the output of two independent UPS systems or parallel UPS
systems in synchronization even when the systems are operating in different modes and even when
either or both systems are operating on batteries. When the LBS is used, one UPS system is
designated as master, the other as slave.
The LBS option is typically used with dual-corded equipment or with either the Liebert®
SmartSwitch™ or Liebert Static Transfer Switch™ (STS) for single-corded equipment.

5.1.1

Performance Requirements
The LBS operates under the following conditions:
• Both master and slave are on inverter
(either system may be on inverter through the rectifier or on inverter through the batteries)
• Master on inverter and slave on bypass
• Master on bypass and slave on inverter
• Master and slave on bypass IF the bypass source is the same for both systems

5.1.2

LBS Cable and Settings
For Liebert NX™-to-Liebert NX dual bus configuration, only one optional LBS cable is required, the
built-in LBS will operate normally without an extra LBS control box or interface box. The LBS port is
X4 on the Parallel Board (M3). The Parallel Board is on the interior of the Liebert NX, above and left
of the power electronics; see Figures 30 and 33.
An optional, 9-pin LBS cable is used to connect two UPS systems through each system’s DB9 port on
its Parallel Board. For two parallel systems, the LBS cable can be mounted between any two units
belonging to different parallel systems. For information about the LBS kit or to order the optional
equipment, see your local Liebert representative.
The LBS cable is connected as illustrated in Figures 12 and 13.

Figure 12 Load Bus Synchronization cable connection in single module systems
LBS Cable

Parallel Board
X3

Parallel Board

X4

X4

X2-1 X2-2

X2-1 X2-2

X1-1 X1-2

UPS Module or
System #1

X1-1 X1-2

UPS Module or
System #2

28

The parallel board is on the
interior of the Liebert® NX™ UPS,
above and left of the power
electronics; see Figure 29.

Options

Figure 13 Load Bus Synchronization cable connection with multi-module systems

UPS

8

X2-1

X2-2

X1-1

X1-2
P4

X1-2

X2-1

P1

P2

P1

X1-1

X1-2

X4

P3

X2-2

P1

LBS
Cable
DBS
Cable

P4

X1-1
P3

X1-2

X2-1

Parallel Board
X3
P5

X4

P4

X2-2

P2

P1

X2-1

P4

P2
P3

X1-1

X4

P2

X4
X2-2

Parallel Board
X3
P5

Parallel Board
X3
P5

P3

Parallel Board
X3
P5

UPS

8
Parallel System I

A

Parallel System II

B

The LBS function is activated with configuration software; when the LBS takes effect, the graphic
LCD will display “LBS active.”

29

Options

5.2

Configuring Parallel Sbasystem Operation

5.2.1

General
The Liebert® NX™ uses intelligent and reliable decentralized technology to achieve parallel operation
of two or more modules.
The parallel system is used to:
• Increase the reliability of the system to ensure adequate power supply to the critical load connected.
• Increase serviceability and allow the execution of maintenance operations and repairs without
affecting the ordinary operating conditions of the system (depending on the redundancy level).

5.2.2

Features of Parallel System
• The controls for parallel UPS module operation are standard in the Liebert NX, and the configuration can be set up by changing the settings in configuration software.
• It is easy to install the parallel cables in a ring, providing high reliability and redundancy. And
the intelligent paralleling logic provides the user with maximum flexibility. For example, shutting down or starting up the UPS modules in the parallel system can be done in any sequence. If
an overload transfer occurs, the whole system can recover automatically from bypass mode after
the overload is cleared.
• The total load of the parallel system can be queried from each module’s liquid crystal display
screen.

Figure 14 Parallel system block diagram

Liebert NX UPS (40-200kVA)

Liebert NX Basic Paralleling Cabinet

Bypass
(Field Removable
Jumper for Dual
Input)

480V, 3W
Input

Static
Switch
AC

DC
DC

IOB1
AC

DC

480V DC
Battery Input

RIB = Rectifier Input
Breaker
IOB = Inverter Output
Breaker
MBB = Maintenance
Bypass Breaker
MIB = Maintenance
Isolation Breaker
LDB = Load Distribution
Breaker

DC

UPS Module 2

IOB2

UPS Module 3

IOB3

UPS Module 4

IOB4

30

UOB

480V, 3W
Output

Options

Figure 15 Paralleling cabinet with input and bypass circuit breakers

480V, 3W
System Input

480V, 3W
System Output

MBB

Liebert NX UPS (40-200kVA)

MOB

Bypass

Static
Switch
AC

RIB 1

DC
DC

IOB 1

AC
DC
DC

480V DC
Battery
Input

RIB = Rectifier Input
Breaker
IOB = Inverter Output
Breaker
MBB = Maintenance
Bypass Breaker
MIB = Maintenance
Isolation Breaker
LDB = Load
Distribution
Breaker

RIB 2

UPS Module 2

IOB 2

RIB 3

UPS Module 3

IOB 3

RIB 4

UPS Module 4

IOB 4

Figure 16 Paralleling cabinet with input, bypass and distribution circuit breakers

480V, 3W
System Input

MBB

Liebert NX UPS (40-200 kVA)

MIB

Bypass

LDB 1
Static
Switch

RIB 1

AC

DC
DC

IOB 1

User Supplied
Plug-In Output
Breakers

AC
DC

LDB N

DC

480V DC
Battery Input

RIB 2

UPS Module 2

IOB 2

RIB 3

UPS Module 3

IOB 3

RIB 4

UPS Module 4

IOB 4

31

480V, 3W
Output

480V, 3W
Output

Options

5.2.3

Operating Principles
Redundancy Paralleling
The parallel redundant system can noticeably improve system reliability. In normal condition, none of
the UPS modules work at full load. That means that even if the load is increased, the system will not
transfer to bypass. And when a UPS module shuts down due to any failure, the remaining UPS
modules can still power and protect the load. When redundancy is lost due to module failure or load
increase, the parallel system will trigger an alarm.

5.2.4

Operation Modes Summary
The parallel system also has operation modes such as normal, battery, bypass and maintenance
bypass. All UPS modules in the parallel system operate in coordination.
• Normal Mode Operation
The load is powered by the inverters of all the UPS modules in the system. If the frequency of
bypass is within the synchronous range, the inverter will be synchronized with the bypass.
Otherwise, the system will operate at nominal frequency.
• Battery Mode Operation
The batteries of all UPS modules power the load through their inverters. The system operates at
nominal frequency.
• Bypass Mode Operation
The condition to transfer to bypass mode is essentially the same as that of single module system.
The bypass of all the UPS modules powers the load.
• Maintenance Bypass Mode Operation
The sequence to transfer to maintenance bypass mode is the same as for transferring a singlemodule system. The maintenance bypass switches should be switched on as synchronously as
possible. Thus the system can be repaired without interrupting the power supply to critical load.
If ECO mode is selected, the double-conversion UPS operation is inhibited at most times for the
purpose of saving energy. In this mode of operation, not unlike UPS of line-interactive or standby
technology, the bypass is the preferred source. Only when the voltage and/or frequency of the
bypass supply is beyond pre-defined and adjustable limits is the critical AC load transferred to
the inverter.

5.3

Installing Parallel System
The basic installation procedure of parallel system is the same as that of single module system. The
following sections introduce only the installation procedures specific to the parallel system.

5.3.1

Conditions for Parallel System
• Each UPS module must have the same bypass source.
• The outputs of all UPS modules are connected altogether.
• The main inputs can be from different sources, but the phase rotation sequence of main inputs,
bypass inputs and outputs must be correct and the same.
• The parallel logic cable and load sharing cable must be connected in a ring correctly (see
Figure 17).

NOTICE
Risk of creating parallel systems with incorrect power ratings. Can cause equipment damage.
When paralleling UPS’s with different power ratings, the power rating of the larger UPS can
be no more than four times the power rating of the smaller UPS.
• 40-80kVA Liebert® NX™ units can be installed in parallel with 80-120kVA Liebert NX
units.
• 80-120kVA Liebert NX units can be installed in parallel with 160-200kVA.
• 40-80kVA Liebert NX units must not be installed in parallel with 160-200kVA Liebert NX
units.

32

Options

5.3.2

Cabinet Installation
Parallel system composed of two or more UPS modules using parallel cabinet
The UPS modules that will form the parallel system should be placed side-by-side. Each battery
cabinet is placed next to its corresponding UPS module.
The parallel cabinet should be placed in the middle of the system.

5.3.3

Preliminary Checks
Each UPS module should have the same firmware and the same hardware version. Refer to the
instructions in 5.3.1 - Conditions for Parallel System.

5.3.4

Power Cables
Wiring of power cables is similar to that of a single module system (See 3.1 - Power Cabling). The
bypass sources of all modules should be the same, and the outputs should be connected altogether
correctly.
Power cables are field-supplied. Power cables to the UPS’s of the paralleling cabinet must be routed
through either the top or bottom entry access of the UPS.
NOTE
The system input and/or output circuit breaker is to be field-supplied. See Table 8 for current
rating.
NOTE
The length and specifications of power cables including the bypass input cables and UPS
output cables should be the same, thus the load can be shared evenly in bypass mode.

5.3.5

Parallel Control Cables
Parallel System Control Cables
Make the connections listed below on the parallel logic board (M3) inside the Liebert NX. (See
Figure 30 for the location of the parallel logic board):
Shielded and double-insulated control cables, available in lengths of up to 100 feet (30m), must be
interconnected in a ring configuration between UPS modules as shown below. The ring configuration
ensures high reliability of the control (refer to Figure 17).

Figure 17 Connecting system parallel control cables

1
Parallel Board
X3
P5

Parallel Board
X3
P5

X4
X2-2

UPS

2

X2-1

3
Parallel Board
X3
P5

X4
X2-2

4
Parallel Board
X3
P5

X4

X2-1

X2-2

X2-1

X4
X2-2

X2-1

33

X1-1

P1
X1-2
P4

P2

P1
X1-2

P3

X1-1

P4

P2

P1
X1-2

P3

X1-1

P4

P2

P1
X1-2

P3

P3

X1-1

P4

P2

Interconnecting
Cables

Options

Auxiliary Dry Contact Cables
The external output breaker of each UPS must have Normally Open auxiliary contacts. These
contacts must be wired to connector X3 on the Parallel Logic Board (M3). See Figure 18.

:X T M IAN T

X2 2

P2

X2 1

P1

DBS

X3

485485+

Figure 18 Auxiliary dry contact cables for output breaker in multi-module system

! CAUTION
The auxiliary control wire must be installed to ensure proper operation of the system.
NOTE
For startup procedure, 11.2 - UPS Startup.

34

Options

5.3.6

Emergency Power Off (EPO)
The external emergency stop facility is identical to that described for the single unit installation—
that an individual emergency stop button is provided for each unit.

Figure 19 Connecting EPO push button

UPS2
X2:3
X2:4
X2:3
X2:4

Monitor Board

Monitor Board

UPS1
Normally
Open EPO
UPS2
X2:1
X2:2
X2:1
X2:2

Monitor Board

UPS1
Normally
Closed EPO

35

Monitor Board

UPS Specifications

6.0

UPS SPECIFICATIONS
These specifications describe requirements for the Liebert® NX™ UPS.

6.1

Conformity and Standards
The UPS has been designed to conform to the following standards:
• UL Standard 1778
• CSA 22.2, No. 107.1
• FCC Part 15, Class A
• IEC 61000-4-5
• National Electrical Code (NFPA-70)
• NEMA PE-1
• ISTA_1H
The UPS shall be UL and cUL listed per UL Standard 1778.

6.2

UPS Environmental
The UPS is designed to operate under the following environmental conditions without damage or
degradation in electrical operating characteristics.

Table 6

Environmental characteristics
40kVA

Rated Power

60/80kVA

100/120kVA

Operating Temperature, UPS

32°F to 104°F (0°C to 40°C)

Optimal Operating Temperature, Battery

68°F to 86°F (20°C to 30°C)

Relative Humidity

0 to 95%, non-condensing

Accoustical Noise, dBA at 39 in. (1m)
(fans at low speed)

61

61

63

68.5

Up to 6562 ft. (2000m) above mean sea level without derating. Linearly
derated from 100% load at 6,562 ft. (2000m) to 88% load at 9843 ft. (3000m)

Altitude of Operation
Storage-Transport Temperature, UPS,

-4°F to 158°F (-25°C to 70°C)

Storage-Transport Temperature, Battery

-4°F to 86°F (-20°C to 33°C)

6.3

160/200kVA

UPS Mechanical Characteristics

Table 7

UPS mechanical characteristics
Parameter

40 kVA 60kVA 80kVA 80kVA 100kVA 120kVA 160kVA

200kVA

Dimensions, W x D x H, inches (mm)
All Units

25.5 x 39.0 x 78.7
(648 x 978 x 2000)

Units for use
with Liebert BDC

—

—

—

Units with Wiring
Cabinet Extension

—

—

—

—

—

—

25.5 x 39.0 x 78.7
(648 x 978 x 2000)

—

—
48.8 x 39.0 x 78.7
(1239 x 978 x 2000)

41.0 x 39.0 x 78.7
(1041 x 978 x 2000)

64.4 x 39.0 x 78.7
(1636 x 990 x 2000)

Weight, lb (kg)
All Units

1290 (585)

—

—

For use with Liebert BDC

—

1422 (645)

2201 (998)

Includes Wiring Cabinet Extension

—

1847 (837)

2626 (1191)

Heat Dissipation, BTU/H (kWH)

12,200 15,400 20,600 19,700
(3.6)
(4.5)
(6.0)
(5.8))

24,300
(7.1)

28,700
(8.4)

35,900
(10.5)

47,00
(13.8)

Airflow, CFM (m3/h)

620
(1050)

920
(1550)

920
(1550)

1590
(2700)

1590
(2700)

620
(1050)

620
(1050)

Cable Entry

1668
(2834)

Bottom or Top

Color

Black (ZP-7021)

Protection Grade
(with open/closed front doors)

IP 20

36

UPS Specifications

6.4
Table 8

UPS Electrical Characteristics
UPS terminal

Input (For Single-Input Unit)

Unit
Rating

Nominal
Input
Current

Maximum
Input
Current

40
48
60
60
71
89
80
94
118
100
117
147
120
140
175
160
186
233
200
234
293
Rectifier Input (For Dual Input Unit Only)

Unit
Rating

Nominal
Input
Current

Maximum
Input
Current

40
48
60
60
71
89
80
94
118
100
117
147
120
140
175
160
186
233
200
234
293
Bypass Input (For Dual Input Units)

Maximum Recommended Lug
(Thomas & Betts Part #)

OCP
Current

OCP
Device
Rating

Bolt
Size

Compression
1-Hole

Mechanical
1-Hole;

72
106.8
141.5
176.3
210
279.5
351.5

80
110/125
150
175
225
300
350

M8
M8
M8
M8
M8
M10
M10

54140
54148
54110
54112
54174
54286
256-30695-886

ADR35
ADR35
ADR35
31015
31015
31015
31015

OCP
Current

OCP
Device
Rating

Bolt
Size

Compression
1-Hole

Mechanical
1-Hole

72
106.8
141.5
176.3
210
279.5
351.5

80
110/125
150
175
225
300
350

M8
M8
M8
M8
M8
M10
M10

54140
54148
54110
54112
54174
54286
256-30695-886

ADR35
ADR35
ADR35
31015
31015
250mcm
500mcm

Maximum Recommended Lug
(Thomas & Betts Part #)

Maximum Recommended Lug
(Thomas & Betts Part #)

Nominal
Input
Current

Maximum
Input
Current

OCP
Device
Rating

Bolt
Size

Compression
1-Hole

Mechanical
1-Hole

48
72
96
120
144
192
241

60
90
120
150
180
240
300

70
110
125
150
200
250
300

M8
M8
M8
M8
M8
M10
M10

54140
54145-TB
54155-TB
54110
54112
54286
256-30695-886

ADR35
ADR35
ADR35
ADR35
31015
31015
31015

Unit
Rating

Nominal
Output
Current

Maximum
Output
Current

OCP
Device
Rating

Bolt
Size

Compression
1-Hole

Mechanical
1-Hole

40
60
80
100
120
160
200

48
72
96
120
144
192
241

60
90
120
150
180
240
300

70
110
125
150
200
250
300

M8
M8
M8
M8
M8
M10
M10

54140
54145-TB
54155-TB
54110
54112
54174
256-30695-886

ADR35
ADR35
ADR35
ADR35
31015
31015
31015

Unit
Rating
40
60
80
100
120
160
200
Output

Maximum Recommended Lug
(Thomas & Betts Part #)

37

UPS Specifications

Table 8

UPS terminal (continued)

Battery
Maximum
Recommended
Lug
(Thomas &
Betts Part #)
Unit
Rating

Nominal
Discharge
Current

Maximum
Discharge
Current

OCP
Device
Rating

Bolt
Size

Compression
One-Hole; 3/8"
bolt

40
60
80
100
120
160
200

82 at 480VDC
122 at 480VDC
163 at 480VDC
204 at 480VDC
244 at 480VDC
367 at 480VDC
408 at 480VDC

103 at 384VDC
155 at 384VDC
206 at 384VDC
258 at 384VDC
309 at 384VDC
412 at 384VDC
515 at 400VDC

125
175
225
300
350
450
600

M8
M8
M8
M8
M8
M10
M10

54106
54107
54152-TB
54157
54167
54115
54115

1.
2.
3.
4.
5.

Nominal (Nom) current is based on full rated output load.
Maximum (Max) current (125% of nominal) is short duration for battery recharge conditions.
UPS input and bypass cables must be run in separate conduit from output cables.
Nominal battery voltage is shown at 2.0 volts/cell per NEC 480-2.
OCPD = Overcurrent Protection Device. Recommended AC input and AC output overcurrent protection represents 125% of nominal full
load current (continuous) per NEC 215.
6. Minimum-sized grounding conductors to be per NEC 250-122. Parity-sized ground conductors are recommended. References are per
NEC 1999.
7. Wiring requirements:
a. AC Input: 3-phase, 3-wire, plus ground.
b. AC Output: 3-phase, 3-wire, plus ground.
8. All wiring is to be in accordance with national and local electric codes.

6.4.1

Input Rectifier
Table 9

Rectifier input power

Rated Power kVA

40

60

80

Rated Voltage, VAC

100

120

480

Supply

3-phase, 3-wire plus ground

Input Voltage Tolerance, VAC
(without derating)

480V Nominal +15%, -20% without derating

Overload capacity of input
current

100% Imax 150% load, less than 200msec

Frequency, Hz

57-66

Power Factor

> 0.99 at full load; >0.98 at half load

Harmonic Current

Less than 3% at full rated UPS output load

See Table 8 for current ratings.

Table 10

160

Input voltage window with derating

Input Voltage Window
(L-L Voltage)

Percentage
of Nominal

Inverter Load,
Percentage

Charger Load,
Percentage

432VAC to 552VAC

90-115

100%

100%

431VAC to 384VAC

80-89

100%

30%

383VAC to 360VAC

75-79

100%

0%

359VAC to 288VAC

60-74

80%

0%

38

200

UPS Specifications

Table 11

Liebert-approved replacement batteries

Battery
Manufacturer

Models
Supplied
12HX205FR
12HX300FR

Enersys

12HX330FR
12HX400RF
12HX505FR
45HR2000
24HR3000

East Penn

27HR3500
31HR4000
31HR5000
UPS12-100MR
UPS12-150MR
UPS12-210MR

C&D

UPS12-300MR
UPS12-400MR
UPS12-490MR
UPS12-540MR

6.4.2

DC Intermediate Circuit
Table 12

DC intermediate circuit
Rated Power kVA

40

Recommended number
of lead-acid batteries

60

80

100

200

2.27VDC *

Recommended boost charge voltage

2.4VDC *

Recommended end of discharge voltage

1.67 - 1.75 VDC
14.8

22.2

Maximum boost charge duration, min. *

29.6

37.0

44.4

59.2

74

1800

Boost-float threshold current, A *
Temperature voltage compensation, mV/°C *

160

Total 40 battery blocks of 12VDC (240 cells of 2VDC)
will be supported by UPS

Recommended float charge voltage

Maximum recharge battery current, A *

120

0.1 C default
From 0 to 5 mV/deg. C/cell. Default value is 3mV/deg. C/cell.*
≤1

Ripple voltage superimposed%
* Set by configuration software and based on usage of VLRA batteries.

See Table 8 for current ratings.

39

UPS Specifications

6.4.3

Inverter Output
Table 13

Inverter output
40

Rated Power kVA

60

80

Rated voltage, VAC

100

120

160

200

144

180

480

Supply

3-phase, 3-wire plus ground

Frequency, Hz

60 (50Hz in frequency converter mode)

Rated Power, kW

36

54

72

90

108

Three-phase transient
overload, min. load

105% to 110% for 60 minutes
111% to 125% for 10 minutes
126% to 150% for 1 minute

Voltage Regulation%

±1% 3-phase RMS average for a balanced three-phase load for the combined variation
effects of input voltage, connected load, battery voltage, ambient temperature and load
power factor
±2% 3-phase RMS average for a 100% unbalanced load for the combined variation
effects of input voltage, connected load, battery voltage, ambient temperature and load
power factor

Frequency Regulation%

Nominal frequency regulation is ±0.05% in single module mode,
and+/- 0.25% in parallel mode.

Maximum rate of change
of frequency, Hz/sec

Selectable from 0.1Hz/sec to 3.0Hz/sec maximum for single unit
Fixed maximum of 0.2Hz/sec for paralleled units

See Table 8 for current ratings.

6.4.4

Bypass Input
Table 14

Bypass input

Rated Power, kVA

40

60

80

Rated voltage, VAC

Bypass overload
capacity (all ratings)

160

3-phase, 3-wire plus ground
Upper limit: +10%, +15% or +20%; Upper limit default: +15%
Lower limit: -10%, -20%, -30% or -40%; Lower limit default: -20%

Frequency, Hz
Input frequency tolerance%

120

480

Supply
Bypass voltage tolerance%

100

60
±2.5%, ±5%, ±10% and ±20%; default ±10%
Rated Output Current:
105% to 110%:
111% to 125%:
126% to 150%:
1000%:

Duration of Overload
60 Minutes
10 Minutes
1 Minute
100 Milliseconds

See Table 8 for current ratings.
Bypass frequency synchronization range setting should be wider than bypass frequency shift range.

40

200

Liebert® BDC™

LIEBERT® BDC™

7.0

The Liebert BDC is designed to operate in UPS mode, bypass mode and maintenance mode. The
Liebert BDC offers either 45kVA or 90kVA capacity to match the associated Liebert NX™ frame
offerings. Each of the Liebert BDC capacities offer optional 480V and 600V internal transformers as
well as multiple output distribution selections.
Figure 20 Single input UPS with external Liebert BDC with optional internal transformer—typical
configuration
UPS AC input and AC output cables are factory-supplied when UPS and Bypass
Distribution Cabinet are bolted together

Bypass Distribution Cabinet

Isolation
Transformer

MBB
* AC Input
3W + G

SKRU

UPS Cabinet

225A

42 Poles

225A

42 Poles

225A

42 Poles

CB3
225A
BIB

Remove Jumper
for Dual Input
Configuration

CB2

42 Poles

200kVA
Only

Static Bypass

CB1

Rectifier

Inverter

CB5

MIB

Converter
Local Grounding
Electrode
2 Wire + Ground
Field-Supplied Wiring

Battery Cabinet

* External Overcurrent
Protection By Others
MBD

7.1

FPC12004
Rev. 3

Normal (UPS) Mode
While the Liebert BDC is in Normal mode (MBB open; BIB/MIB closed), the UPS is supplying the
connected load with continuous, high-quality AC power. In this mode of operation, the load is
protected by the UPS.

41

Liebert® BDC™

7.1.1

Bypass Mode
When the Liebert BDC is in Bypass mode, it provides an alternate path for power to the connected
equipment. Should the UPS need to be taken out of service for limited maintenance or repair, manual
activation of the bypass will cause an immediate transfer of the equipment from the UPS inverter to
the bypass source. In this mode, power will still be supplied to the UPS; however, the load is NOT
protected by the UPS.

7.2

Maintenance Mode
When the Liebert BDC is in Maintenance mode (MBB closed; BIB/MIB open), it provides an alternate
path for power to the connected equipment should the UPS need to be taken out of service for limited
maintenance or repair. In this mode of operation, no power is supplied to the UPS and the load is
NOT protected by the UPS.

7.3

Locating the Cabinet
This Liebert BDC may be mounted to the left of the UPS or installed as a stand-alone unit. In either
case, ensure that the unit is in a well-ventilated area and that there is clearance for access to the
switches and cable connections as required by national and local codes.

7.4

Cable Installation

7.4.1

Wiring Preparation
Be sure that the unit is not connected to any AC utility power source or UPS before installing any
wiring to this unit. This Liebert BDC should be installed by a qualified / certified electrician.

WARNING

Risk of electrical shock and arc flash. Can cause property damage, injury and death.
Read this section thoroughly before attempting to install wiring to this unit. Read and
comply with all warnings and cautions in this manual.

Removing the Cover Plates
Plates cover the input and output terminals on the front of the Liebert BDC. Remove these and keep
the screws and plates for reinstallation.

7.4.2

Power Cable Installation
Refer to Table 15 when selecting cables.
Table 15

Power cable size selection (Copper Wire Only)
Bus Type
Main Input
Terminal

Liebert®

NX™

40kVA UPS

Liebert NX 60kVA UPS

Bypass Input

Single Input

Dual Input

Dual Input

Output

4

4

4

3

1

1

2

2

Liebert NX 80kVA UPS

2/0

2/0

1/0

1/0

Liebert® NX™ 100kVA UPS

4/0

4/0

2/0

2/0

Liebert NX 120kVA UPS

250

250

4/0

4/0

Liebert NX 160kVA UPS

2-3/0

2-3/0

2-3/0

2-3/0

Liebert NX 200kVA UPS

2-4/0

2-4/0

2-4/0

2-4/0

Liebert NX 480V
Battery Cabinet DC Input Bus

225A

350A

600A

—

4/0AWG

400kcmi

2-350kcmil

—

NOTE
Transient and steady state earth leakage currents may occur when starting the equipment.
This should be taken into account when selecting ground current detection devices because
these will carry the earth leakage currents of both the UPS equipment and the load.
42

Liebert® BDC™

7.4.3

Input/Output Wiring
Follow the steps below to connect the input wiring:
NOTE
Input wiring must be installed using conduit if cabinet is not mounted to the immediate right
of the UPS.
1. Locate the input wiring access (top or bottom access), remove the conduit landing plate and punch
the appropriate size hole for the size conduit being used. Pull the three/four input wires through
it, allowing some slack for installation. For cabinets that are located to the immediate left of the
UPS, the access plate is on the lower right of the cabinet. Remove the access plate and verify that
the edge guarding is installed and intact.
2. Secure the conduit to the access plate of the Liebert BDC.
3. Input power cables connect to the system input circuit breaker; refer to Figure 21 and Table 34.
4. Connect the ground (earth) wire to the earth busbar and tighten it to 240lb-in. (27N-m) (M10
bolt).
5. Locate UPS input and output cables and access panel to UPS on lower right side.
NOTE
If the Liebert BDC is not to be bolted to the UPS, use either top or bottom access plate.
6. Connect the system ground cable between the Liebert BDC and UPS and tighten the connections
to 240lb-in. (27N-m) (M10 bolt).
7. Connect the system input cables between the Liebert BDC “UPS Input” Busbars (A-B-C N
terminals) and UPS input busbars (A-B-C N terminals) and tighten the connections to 240lb-in.
(27N-m) (M10 bolt).
8. Connect the system output cables between the Liebert BDC 'UPS Output' Busbars (A-B-C N
terminals) and UPS output busbars (A-B-C N terminals) and tighten the connections to 240lb-in.
(27N-m) (M10 bolt).

NOTICE
Risk of improper wiring connection. Can cause equipment damage.
The control wire must be installed to ensure proper operation of the system and fully protect
the load when switching between bypass cabinet and UPS.

43

Liebert® BDC™

Figure 21 Liebert® BDC connection to UPS

NOTES
1. All Liebert-supplied cable must be repositioned prior to and while the cabinets are being placed in
their final installed location.
2. All interconnection hardware supplied by Emerson®.
3. AC connections must be made to the UPS module before attaching Liebert BDC to UPS module.
4. All cabling will be field-supplied when a Liebert BDC is configured as a stand-alone cabinet.
5. Liebert BDCs must attach to the right side only of the Liebert NX™.
6. Refer to the individual drawing of each piece of equipment for additional details.
Table 16

Control wiring for Liebert® NX™ UPS to Liebert BDC
From

To

Liebert NX UPS
Monitor Board X1-J21

Liebert BDC Terminal Strip (TB2)

J21-3 INV_S

TB1-2

J21-4 INV_C

TB2-1

NX 480 UPS Parallel Board X3

Liebert BDC Terminal Strip (TB2)

X3-1-EXT-MAINT

TB2-3

X3-2-GND2

TB2-4

44

H3

H2

H1

45

X0

X3

X2

W564

W574

Isolation Transformer
Output Voltage
208/120
220/127

Table 1

Isolation
Transformer

X1

W571

Black

T2 Transformer
Tap Location
208V (Yellow)
240V (Red)

Fuse 6
1/2 Amp
600 Volt

Fuse 1
1/2 Amp
600 Volt
W563

Inverter Bus Output Switch
inhibited When
Circuit Is Closed

Red

Black

7

4

A

TB2-1
TB2-2
TB2-3
TB2-4

8

5

2

K1

3 Amp Inline Fuse
Provided With
T2 Transformer

W571

J21-INV_S
To Parallel Board X3-1-EXT-MAINT
To Parallel Board X3-2-GND2

J21-INV_C

24 VAC

To UPS Monitor Board
Terminal Block J21

See Note 1
& Table

Common Black

600V White
480V Orange
400V Blue
240V Red
208V Yellow

Transformer

W570

1

1
2
3
4
5
6

TB2

B

W565
Black

W565

W572
W573

9

6

3

W566

W567

8

7

6

5

4

3

2

1

Solenoid Key Release Unit
(Auxiliary switch shown in
position with key installed.)

Interlock key normally retained
In lock. Key removable when
Solenoid is energized.

53469
Rev. 5

Solenoid Key Release Unit

Factory-Supplied Busbar

Field-Supplied Wiring

Factory-Supplied Wiring

Wiring Legend

W572
W573

W569
W564

W568

Indicator
W569
W570

OK to Transfer W567

Push Button Switch

Liebert® BDC™

Figure 22 Liebert BDC connection to Liebert® NX™

NOTE
Install jumper on TB1 pins 4 and 5. For startup procedure, see 11.2 - UPS Startup.

Liebert® BDC™

Table 17
kVa

15

Circuit breaker schedule - Main circuit breaker
Frame Amps

Trip Amps

Model Number

Interrupting
Rating AIC

208V

250A

60A

T4S060TW-S24

100K

240V

250A

50A

T4S050TW-S24

100K

380V

250A

30A

T4S030TW-S24

35K

250A

30A

T4S030TW-S24

35K

415V

250A

30A

T4S030TW-S24

35K

480V

250A

25A

T4S025TW-S24

35K

600V

250A

20A

T4S020TW-S24

25K

208V

400A

110A

T4S110TW-S24

100K

240V

400A

100A

T4S100TW-S24

100K

250A

60A

T4S060TW-S24

35K

250A

60A

T4S060TW-S24

35K

415V

250A

60A

T4S060TW-S24

35K

480V

250A

50A

T4S050TW-S24

35K

600V

250A

40A

T4S040TW-S24

25K

208V

600A

200A

T4S200TW-S24

100K

240V

400A

175A

T4S175TW-S24

100K

380V

250A

100A

T4S100TW-S24

35K

Voltage In

400V

Vendor

ABB

380V
30

50

75

100

400V

400V

ABB

ABB

250A

100A

T4S100TW-S24

35K

415V

250A

90A

T4S090TW-S24

35K

480V

250A

80A

T4S080TW-S24

35K

600V

250A

70A

T4S070TW-S24

25K

208V

600A

300A

T5S300TW-S24

100K

240V

600A

250A

T4S250TW-S24

100K

380V

400A

150A

T4S150TW-S24

35K

400A

150A

T4S150TW-S24

35K

415V

400A

150A

T4S150TW-S24

35K

480V

250A

125A

T4S125TW-S24

35K

600V

250A

100A

T4S100TW-S24

25K

208V

250A

400A

T5S400TW-S24

100K

240V

250A

350A

T5S350TW-S24

100K

380V

250A

200A

T4S200TW-S24

35K

250A

200A

T4S200TW-S24

35K

415V

250A

200A

T4S200TW-S24

35K

480V

250A

175A

T4S175TW-S24

35K

600V

250A

125A

T4S125TW-S24

25K

208V

250A

450A

T5S450BW-S24

100K

240V

250A

400A

T5S400BW-S24

100K

250A

250A

T4S250TW-S24

35K

250A

250A

T4S250TW-S24

35K

415V

250A

225A

T4S225TW-S24

35K

480V

250A

200A

T4S200TW-S24

35K

600V

250A

175A

T4S175TW-S24

25K

400V

400V

ABB

ABB

380V
125

400V

ABB

46

Liebert® BDC™

Table 17
kVa

Circuit breaker schedule - Main circuit breaker (continued)
Frame Amps

Trip Amps

Model Number

Interrupting
Rating AIC

208V

400A

600A

T5S600BW-S24

100K

240V

250A

500A

T5S500BW-S24

100K

250A

300A

T5S300BW-S24

35K

250A

300A

T5S300BW-S24

35K

415V

250A

300A

T5S300BW-S24

35K

480V

250A

250A

T4S250TW-S24

35K

600V

250A

200A

T4S200TW-S24

25K

380V

400A

400A

T5S450BW-S24

35K

400V

400V

400A

T5S400BW-S24

35K

400A

400A

T5S400BW-S24

35K

480V

400A

350A

T5S350BW-S24

35K

600V

250A

250A

T4S250TW-S24

25K

380V

600A

450A

T5S450BW-S24

35K

400V

600V

450A

T5S400BW-S24

35K

600A

450A

T5S400BW-S24

35K

480V

400A

350A

T5S350BW-S24

35K

600V

400A

300A

T5S300BW-S24

25K

380V

600A

600A

T5S600BW-S24

35K

400V

600V

600A

T5S600BW-S24

35K

Voltage In

Vendor

380V
150

200

225

300

Table 18

400V

415V

415V

415V

ABB

ABB

ABB

ABB

600A

600A

T5S600BW-S24

35K

480V

600A

500A

T5S500BW-S24

35K

600V

400A

400A

T5S400BW-S24

25K

Main panelboard circuit breaker

kVA

Voltage In

Vendor

Type

Frame
Amps

Tri
pAmps

Model
Number

Interrupting
Rating AIC

15-300

208V

ABB

FIX MTD

225A

225A

T3N225TW

22k

15-300

208V

ABB

PLUG-IN

225A

225A

T3N225TW +

22k

Table 19

Panelboard branch circuit breaker

kVA

Voltage
In

Vendor

Type

Frame
Amps

Trip
Amps

Model
Number

Interrupting
Rating AIC

15-100

208V

SQUARE D

PLUG-IN

100A

15-100A

QO

10K

15-100

208V

SQUARE D

BOLT-IN

100A

15-100A

QOB

10K

15-100

208V

SQUARE D

PLUG-IN

100A

15-100A

QOxxVH

22K

15-100

208V

SQUARE D

BOLT-IN

100A

15-100A

QOBxxVH

22K

15-100

208V

GE

PLUG-IN

100A

15-100A

THQL

10K

15-100

208V

GE

BOLT-IN

100A

15-100A

THQB

10K

15-100

208V

GE

PLUG-IN

100A

15-100A

THHQL

22K

15-100

208V

GE

BOLT-IN

100A

15-100A

THHQB

22K

47

Liebert® BDC™

Table 20

Subfeed circuit breaker

kVA

Voltage
In

Vendor

Type

Frame
Amps

Trip
Amps

Model
Number

Interrupting
Rating AIC

15-300

208V

ABB

FIX MTD

250A

100A

T4N100TW

65K

15-300

208V

ABB

FIX MTD

250A

125A

T4N125TW

65K

15-300

208V

ABB

FIX MTD

250A

150A

T4N150TW

65K

15-300

208V

ABB

FIX MTD

250A

175A

T4N175TW

65K

15-300

208V

ABB

FIX MTD

250A

200A

T4N200TW

65K

15-300

208V

ABB

FIX MTD

250A

225A

T4N225TW

65K

15-300

208V

ABB

FIX MTD

250A

250A

T4N250TW

65K

150-300

208V

ABB

FIX MTD

400A

300A

T5N300TW

65K

150-300

208V

ABB

FIX MTD

400A

350A

T5N350TW

65K

150-300

208V

ABB

FIX MTD

400A

400A

T5N400TW

65K

Table 21

Square D I-Line panelboard circuit breaker

kVA

Voltage
In

Vendor

Type

Frame
Amps

Trip
Amps

Model
Number

Interrupting
Rating AIC

50-300

208V

SQUARE D

PLUG-IN

150A

100A

HGA36100

65K

50-300

208V

SQUARE D

PLUG-IN

150A

125A

HGA36125

65K

50-300

208V

SQUARE D

PLUG-IN

150A

150A

HGA36150

65K

50-300

208V

SQUARE D

PLUG-IN

250A

175A

JGA36175

65K

50-300

208V

SQUARE D

PLUG-IN

250A

200A

JGA36200

65K

50-300

208V

SQUARE D

PLUG-IN

250A

225A

JGA36225

65K

50-300

208V

SQUARE D

PLUG-IN

250A

250A

JGA36250

65K

225-300

208V

SQUARE D

PLUG-IN

400A

300A

LA36300

42K

225-300

208V

SQUARE D

PLUG-IN

400A

350A

LA36350

42K

225-300

208V

SQUARE D

PLUG-IN

400A

400A

LA36400

42K

48

Liebert® BDC™

7.5

Bolting Cabinets Together
NOTE
UPS wiring must be completed before the cabinets are bolted together.
1. Line up cabinets so that mounting holes are aligned.

Figure 23 Bolting a Liebert® NX™UPS to a Liebert BDC™
Output
Cable Plate
(See Note 4)

Air
Exhaust

39.5" (1003mm)
38.6" (980mm)

Including Hinge and
Bezel Projection

Control
Wires

Input
Wires
TOP VIEW
23.5"
(597mm)

78.7?
(2000mm)

Cable
Pass-Through
Area

RIGHT SIDE VIEW

REAR VIEW
Right Side Output
Cable Entry Area
9.5 x 6.5 (241mm x 165mm)
23.5"
(597mm)

1.2"
(30mm)

FRONT VIEW
Input Landing
10 x 5.7 (254mm x 145mm)

17"
(432mm)

36.4"
(925mm)

3.1"
(80mm)

34.0"
(864mm)

8.3" (211mm)
19.9
(504mm)
Output Cable Plate
(See Note 4)

27.7"
(702mm)
Inlet Area
For Cooling
Pedestal Location
Ø0.9" (22mm) Typical

6.0"
(152mm)
11.5"
(292mm)
FRONT
Base Footprint Shaded Area
Indicates Floor Cutout Dimensions
For Colling Air And Cable Entry/exit

BOTTOM VIEW
Notes
1. All dimensions are in inches (mm).
2. 24" (610mm) minimum clearance above unit required for air exhaust.
3. Keep cabinets within 15 degrees of vertical.
4. Output Cable Plates
Panelboard Option: Top output plates have 84 knockouts for
1/2" conduit per plate. Bottom output plates have 84 plugs
for 1/2" conduit per plate.
Output Circuit Breaker Option: Top and bottom output plates
are removable blank plates. Remove, punch to suit conduit size and reinstall.
5. Control wiring and power wiring must be run in separate conduits.
6. All wiring is to be in accordance with national and local electrical codes.
7. Depth dimensions include front and rear doors.
8. Width dimensions without side panels. Add 2.2 (56mm) when adding
both side panels.
9. Clearance of 36" (914mm) minimum is recommended at front and rear for
service access.

Full Load
Heat Output
BTU/HR (kw)

Unit
kVA

Weight
lb (kg)

75

1350 (6128)

8150 (239)

125

1650 (748)

11,500 (3.37)

FPC13600
Rev. 4

2. Using supplied hardware, bolt the cabinets together. The bolts may be inserted from either the
UPS side or from the Liebert BDC side, whichever is more convenient.
49

Liebert® BDC™

Figure 24 Outline drawing, Liebert BDC™, 47" cabinet
47" (1194mm)
R 25.3" (643mm) x
180° Door Swing°

R 25.3" (643mm) x
180° Door Swing°
Output Conduit Plates
11.9" x 15.7" (302 x 400mm)
See Note 4
Input Conduit Plates
5" x 8.5" (127 x 216mm)

36.4"
(925mm)

33.8"
(859mm)

Input Conduit Plates
5" x 8.5" (127 x 216mm)
6" (152mm)

R 25.3" (643mm) x
180° Door Swing°

Control Wiring Holes
2-1/2" (64mm)
R 25.3" (643mm) x
180° Door Swing°

FRONT
Base Footprint Shaded Area
Indicates Floor Cutout Dimensions
For Cooling Air and Cable
Entry and Exit

REAR VIEW

TOP VIEW

Including Hinge
and Bezel
Projection

39.5" (1003mm)
38.6" (980mm)

47" (1194mm)
See Note 8

79.6"
(2021mm)

FRONT VIEW
2.2"
(56mm)

39.2" (996mm)

3.8"
(97mm)

RIGHT
SIDE
VIEW

Unit
kVA

Weight
lb. (kg)

Full Load
Hea Output
BTU/Hr (kw)

200

2610
(1184)

15,500
(4.54)

NOTES
1. All dimensions are in inches (mm).
2. 18" [457mm] minimum clearance above unit required for air exhaust.
3. Keep cabinets within 15 degrees of vertical.
4. Output conduit plates
Panelboard option:
Top output plates have 84 knockouts for 1/2" conduit per plate.
Bottom output plates have 84 plugs for 1/2" conduit per plate.
Output circuit breaker option:
Top and bottom output plates are removable blank plates. Remove,
punch to suit conduit size and reinstall.
5. Control wiring and power wiring must be run in separate conduits.
6. All wiring is to be in accordance with national and local electrical codes.
7. Depth dimensions include front and rear doors.
8. Width dimensions without side panels. Add 2.2 [56mm] when adding
both side panels.
Left and Right Side
Output Cable Access 9. Clearance of 36" [914mm] minimum is recommended at front and rear for
service access.
Area; (2) @ 2"x10"
(210 x 254mm)

6.6" (168mm)

1.9"
(48mm)
Input Conduit Plates
32" x 8" (812 x 204mm)

26.7"
(677mm)

AIR INLET
FOR COOLING

BOTTOM VIEW

1.3"
(33mm)

FPC1360
Rev. 1

Output Conduit Plates
15.7" x 11.9" (400 x 302mm)
See Note 4

50

Installation Drawings

8.0

INSTALLATION DRAWINGS
The diagrams in this section illustrate the key mechanical and electrical characteristics of the
Liebert® NX™ UPS System cabinets.

Figure 25 Outline drawing, Liebert NX 40-120kVA
Power Cable Entry
3.7 x 22.8 (94x 580)

25.5 (648)
23.6 (600)

SIDE VIEW
FRONT

78.7
(2000)
Center
of Gravity

TOP VIEW
Display

Center
of Gravity

33.1
(842)

Detail A

FRONT
20.3
(515)

FRONT

40.9
(1040)

15.4
(390)
1.6 (40)

FRONT VIEW

20.9
(530)

BOTTOM VIEW

Outer Panel
1. All dimensions are in inches (mm).
Caster
2. Minimum clearance 36" front and 8" top
required for air exhaust.
3. Keep cabinet within 15 deg. of vertical
5.9 (150)
while handling.
to Outside
4. Top and bottom cable entry available
Frame
through removable access plates.
Remove punch to suit conduit size and replace.
5. Color: Black.
6. Unit bottom is structurally adequate for forklift
Power
handling.
Cable
7. Open door to replace air filter, washable type.
Entry
8. Side panels are removed between adjacent units
that are bolted together.
9. Leveling feet are not designed to carry the full weight of the
cabinet. Finger-tighten leveler against the floor, then tighten
with a wrench less than two turns for friction fit against floor.

Table 22

3.7 (94) Caster
To Outside Frame
1.55 (39) Leveler
to Outside Frame (See Note 9)
1.6 (41) Leveler to Outside Frame
3.5 (90) Caster
To Outside Frame

Outer Panel

DETAIL A

Weights, Liebert NX 40-120kVA
UPS Weight, lb (kg)

Power Cable Entry
4.9 x 11.4 (125 x290)

38.5 (978)
39 (990)
To Display

kVA Rating

Net

Crated

Heat
BTU/Hr

Cooling Air
CFM

40
60
80
80*
100*
120

1290 (585
1290 (585
1290 (585
1422 (645
1422 (645
1422 (645

1440 (653)
1440 (653)
1440 (653)
1572 (713)
1572 (713)
1572 (713)

11612
15204
20273
19700
23496
28196

620
620
620
920
920
920

Source: U3819203, Rev. 4

51

1.5 (38) Cable Panel
To Outside Frame

U3819203
Rev. 4

Installation Drawings

Figure 26 Terminal details, 34" battery power pack system for Liebert® NX™ 480V UPS
PCB
See
Detail B

Transformer for Alber
monitoring system
(optional)
Fuse input Alber
monitoring system
(optional)

Terminal Block
Aux. Contacts

TOP VIEW
Without Protecting Plates

DETAIL B

2.3 (59)
(-) Negative
Ø 0.4
(9)

1.2 (30)
1.2 (30)

30 (76)

GND
Busbar
See
Detail A

See
Detail C

(+) Positive

DETAIL C

DETAIL A

1. All dimensions are in inches [mm].
2.All cables should be routed before bolting cabinets
together.
3. For stand-alone installations, the interconnecting
cables between the battery cabinet and the UPS
must be provided by others. Optional battery
intercabinet wiring kits are available for
side-by-side line-up installations.
4. All hardware supplied with battery cabinet for
bolting cabinet to UPS. Use M6 hardware provided;
assemble as shown in detail drawings.
5. See installation, operation and maintenance
manual for additional information.
6. All external wiring is to be in accordance with
national and local electrical codes.

U3819205
Rev. 2

FRONT VIEW
Without Doors and Protecting Plate
Table 23

Battery cabinet ground

Unit Rating

Bolt Size

Torque
lb-in (N-m)

80

1/4" (M6)

44 (5)

Source: U3819205, Rev. 2

Table 24

Battery cabinet circuit breaker

Cabinet
Rating

Battery
Current

OCP Device
Rating

Bolt Size

Torque
lb-in (N-m)

80kVA

195

225

1/4" (M6)

44 (5)

Source: U3819205, Rev. 2

52

Installation Drawings

Figure 27 Liebert® NX™ 80-120kVA dimensions—front and left side

Table 25

UPS terminal specifications
Utility Configurations

Breaker Size, Amps

Unit Rating

Bolt Shaft
Size

Torque
lb-in (N-m)

CB1

CB2

CB3

CB4

CB5

80-120

M8

88 (10)

225

225

225

225

225

Source: U3819611, Rev. 0

53

Installation Drawings

Figure 28 Liebert® NX™ 160-200kVA dimensions—front and left side
39.0 (990) to Display
38.5 (978)

48.9 (1242)

61.9
(1573)

Power Cable
Entry
14 x 13 (355x330)

Low Voltage
Entry
5.1 x 3.9
(130x100)

78.7
(2000)

2.7 (68)
Front
Frame

.9 (23)
Outside
Frame

.4 (10)
Outside
Frame

TOP VIEW (Door Open)
DETAIL A

FRONT
5.0 (127) Typ

RIGHT SIDE

38.9 (987)

See Detail A

REAR

To Centers of Caster Brkt. Typ

1.6 (41) Outside
Frame Typ

1.6 (41) Outside
Frame Typ

3
(76)

4.1 (104)

5.7 (146) Typ

27.1 (688)
To Centers
of Caster
Brkt. Typ

1.9 (49)
Front Frame

Front
32.3 x 6.4 (820x163)
Cable Entry Panel

7.3 (186)
Outside Frame

33.1
(842)
Typ

43.7 (1111) Typ.

LEVELER SPACING
Looking Top Down

BOTTOM

(Looking Top Down)
NOTES:
1. All dimensions are in inches [mm]. Weight est. 2201 lb. (1000kg).
2. 24" [610] minimum clearance above unit required for air exhaust, and 36" [914] minimum service clearance at front of unit.
3. Keep cabinet within 15 degrees of vertical.
4. Top and bottom cable entry available through removable access plates. Remove, punch to suit conduit size and replace.
5. Control wiring and power wiring must be run in separate conduits.
6. Aluminum and copper-clad aluminum cables are not recommended.
7. All wiring is to be in accordance with national and local electrical codes.
U3819621
8. Depth dimensions include front door and rear panel.
Rev. 1
9. Width dimension includes side panels. Subtract 2.2" (56mm) when removing both side panels.

Table 26

Electrical specifications, Liebert NX 160-200kVA
Voltage

Rating, kVA

Input

Output

Heat
Rejection
BTU/hr

160

480

480

35,900

1590

200

480

480

47,000

1590

Source: U3819621, Rev. 1

54

Cooling Air
CFM

.8 (19)
Front
Frame

Installation Drawings

Figure 29 Liebert® NX™ 160-200kVA dimensions—front and left side
Ø .39
(10) Typ
DC
Bus

Ground
Bus
1
(25)
Typ

5.9
(150)
20.3
(516)
10.6
(268)

10.1
(258)

1.6
(40)

8
(203)
Typ

LOWER

FRONT

RIGHT SIDE FRONT

Output
Bypass Input Bus
Bus
(Dual Input)
See Detail A
See Detail A

Main Input Bus
See Detail A

DETAIL A
Input/Output/Bypass

Right Front Corner
Post Not Shown

Ø .39
(10) Typ

1
(25)
Typ

GROUND BUS

BOTTOM CABLE ENTRY
3.9 (100)
Access Plate Height

Rear

BOTTOM VIEW
1. All dimensions are in inches [mm].
2. 24" [610] minimum clearance above unit required
for air exhaust and 36" [914] minimum service clearance at front of unit.
3. Keep cabinet within 15 degrees of vertical.
4. Top and bottom cable entry available through removable access
plates. Remove, punch to suit conduit size and replace.
5. Control wiring and power wiring must be run in separate conduits.
6. Aluminum and copper-clad aluminum cables are not recommended.
7. All wiring is to be in accordance with national and local electrical codes.
8. Terminal connecting hardware included.

55

1
(25)
Typ

Ø .39
(10) Typ

DC BUS

U389641
Rev. 0

Installation Drawings

Figure 30 Liebert® NX™ 40-120kVA main components—typical unit

Parallel Board
Monitor
Board
Intellislot
Communication
Ports

Input Breaker
(CB1)
Bypass Breaker
(CB2)

Replaceable
Air Filters

Maintenance
Bypass Breaker (CB3)
Output Breaker
(CB5)

CB1

DC Bus

CB2

CB3

CB5

Output Bus
Main Input GND
Bypass
Bus
Input Bus
FRONT VIEW (Dual Input)
(door open)

56

Installation Drawings

Figure 31 Liebert® NX™ 160-200kVA dimensional view—front and left side
1239mm (48.8")

979mm (38.5")

2000mm
(78.7")

1000mm
(39.4")

610mm (24")

590mm 23.2"

FRONT VIEW

57

LEFT VIEW

Installation Drawings

Figure 32 Liebert® NX™ 160-200kVA dimensions continued—top and bottom view

1239mm (48.77")

1110mm (43.72")

972mm
(38.28")

842mm
(33.14")
355mm
(13.99")

1239mm (48.77"

A

330mm
(12.99")

BOTTOM VIEW
Front of UPS

TOP VIEW
Front of UPS
Detail A

58

Installation Drawings

Figure 33 Liebert® NX™ 160-200kVA main components—typical unit
Parallel Board

Monitor
Board
Intellislot
Communication
Ports

Input Breaker
(CB1)

Replaceable
Air Filters

Bypass Breaker
(CB2)
Maintenance
Bypass Breaker
(CB3)
Output Breaker
(CB5)

DC Bus

Main Input
Bus

Bypass
Output
Input Bus Bus

59

Ground

Installation Drawings

Figure 34 Liebert® NX™ 40-120kVA cable connections
NOTES

600
(23.6")

1. All dimensions are millimeters (in.).
2. Top and bottom cable entry available through
removable access plates. Remove, punch to
accommodate conduit size and replace.
3. Control wiring and power wiring must be run in
separate conduit. Output and input cables must
be run in separate conduit.
4. Aluminum and copper-clad aluminum cables are
not recommended.
5. All wiring is to be in accordance with national
and local electrical codes.

2000
(78.7")

20 (.79")

35
(1.38")

FRONT VIEW
(with door removed)
CB1

CB2

CB3

CB5

25.4
(1")
158.1
(6.22")

6
(.24")
DC

35
(1.38")
36 (1.42")

Output

Main
Bypass

DETAIL A
60

GND

Installation Drawings

Figure 35 Liebert® NX™ 160-200kVA cable connections

65mm
(2.56")

FRONT VIEW
(door removed)

A

DC Bus

224mm
(8.83")
Main Input
Bus
O 10mm
(0.394")
80mm
(3.15")

Bypass
Input Bus
(Dual Input)

61

80mm
(3.15")

Output
Bus

DETAIL A

80mm
(3.15")

Installation Drawings

Figure 36 Outline drawing, 33" battery power pack system, single cabinet
169.5 (6.7)

896.6
(35.3)

609.3
(24)

372.7 (14.7)

26.8 (1.1)

172.1
(6.8)

474.3
575.9
(18.7)
(22.7)

322.9
(12.7)
322.9
(12.7)

779.1
(30.7)
872.2
(34.3)

Bottom
(Viewed From Below)

Max. Door Swing: 120°

Top
(Viewed From Above)
845
(33.2)

965
(38)

418.9 (16.5)

490.3
(19.3)
Center
of Gravity

Center
of Gravity

2000
(78.7)

Leveling
Feet
(See
Note #9)

683
(26.9)
Right Side

Front
(Without Door)

1. All dimensions are in millimeters (inches)
2. Minimum clearance 36" front and 8" top required for air exhaust.
3. Top and bottom cable entry available through removable access plates.
4. Keep cabinet within 15 deg. of vertical while handling.
5. Control wiring and power wiring must be run in separate conduit.
6. Aluminum and copper clad cables are not recommended.
7. All wiring is to be in accordance with national and local electrical codes.
8. Intercabinet wiring between the UPS and the external battery cabinet is
field-supplied.
9. Leveling feet are not designed to carry the full weight of the cabinet.
Finger-tight leveler against the floor, then tighten with a wrench less
than 2 turns for friction fit against floor.
10. Side panels included.
11. M10 threaded mounting holes used for seismic anchoring or floor stand.
NOTE: If floor stand is used the weight of the unit must be supported under
all casters. Mounting holes same spacing front and rear.
13. Battery-support tray connects to the front of the cabinet with the
support brackets. Without the support, the battery may fall out of the cabinet.
U3819204
62

Installation Drawings

Figure 37 Terminal details, 33" battery power pack system, single cabinet Liebert® NX™

59
(2.32)

PCB

(-) Negative

Transformer
For Alber Monitoring
System (Optional)

9
(0.30)
76.2
(3)

Fused Input
for Alber Monitoring
System (Optional)
Terminal Block
Aux. Contacts

DETAIL B
B
(+) Positive

A

Top
(Without Protective Plates)
NOTES:
1. All dimensions are in millimeters (inches).
2. All cables should be routed before bolting cabinets togethe r.
3. The cables between the battery cabinet and the UPS cabinet
must be supplied by others.
4. All hardware supplied with battery cabinet for bolting cabinet
to UPS use M6 hardware provided; assemble as shown in
detail drawings.
5. All external wiring is to be in accordance with national
and local electrical codes.

U3819205

Front
(Without Doors and
Protective Plates)

63

Installation Drawings

Figure 38 Outline drawing, 49" battery power pack system, single cabinet
974mm (38.3")

1240mm (48.8)

1997mm
(78.6")

868.7mm
(34.2")

485.3mm
(19.1")
A

481.1mm (18.94")

Cable Entry Panel
190x290mm (7.2x11.4")
typ. 2
188mm
(7.4")typ.

183mm (7.2)
Outside
Frame

271mm
(10.7")
Front Frame

323mm
(12.7") typ.

296mm (11.7")
Outside Frame
Cable Entry Panel
190x290mm (7.2x11.4")
typ. 2

Rear
482mm
(19.0") typ.

SECTION A-A
(Plan View)

1616mm
(63.6")

482mm
(19.0")
typ.

TOP VIEW
(Door Open)

1140mm (44.9")
typ.

841mm
(33.1")
typ.

LEVELER SPACING

64

98mm (3.9")
Outside Frame

509mm (20")
FrontFrame

271mm
(10.7")
Rear Frame

323mm
(12.7") typ.

138mm
(5.4") typ.

RIGHT SIDE

A

FRONT

Installation Drawings

Figure 39 Terminal details, 49" battery power pack system

Negative
(-)

A Positive

Ground

Detail A

PCB

Positive
(+)

Transformer for Alber
Monitoring System
(Optional)

Terminal Block /
Aux Contacts
B

Top View
(without BCB Cover Plate)

Detail B

65

Fused Input
for Alber Monitoring
System (Optional)

Installation Drawings

Figure 40 Liebert® NX™ 160-200kVA UPS to 49" battery cabinet interconnection

C

A

C

D
A
NX 160-200KVA UPS Module
Front View
B

C

D

B

D

49" Battery Cabinet Right-Side Views
NOTES:
1. All cables must be repositioned prior to and while setting the cabinets in their installed location.
2. Refer to the individual drawing of each piece of equipment for additional details.
Run

From

To

Conductors

A

UPS Battery Terminal Block

External Battery Cabinet

Positive, Negative

B

External Battery Cabinet

Additional External
Battery Cabinet(s)

Positive, Negative

C

Battery Cabinet(s) Breaker
Control Terminal Block

UPS Monitoring Board

Battery Breaker
Auxiliary Contacts

D

UPS Ground

Battery Cabinets Ground

Ground

66

Installation Drawings

Figure 41 Liebert® NX™ 40-120kVA UPS to 33" battery cabinet interconnection

NOTES:
1. All cables must be repositioned prior to and while setting the cabinets in their installed location.
2. Refer to the individual drawing of each piece of equipment for additional details.
Run

From

To

Conductors

A

UPS Battery Terminal Block

First External Battery Cabinet

Positive, Negative

B

External Battery Cabinet

Additional External
Battery Cabinet(s)

Positive, Negative

C

Battery Cabinet(s) Breaker
Control Terminal Block

UPS Monitoring Board

Battery Breaker
Auxiliary Contacts

D

UPS Ground

Battery Cabinets Ground

Ground

67

Installation Drawings

Figure 42 Outline drawing, Liebert® NX™ 480V 33" parallel cabinet

845
(33.2)

965
(38)
2000
(78.7)

Top

Front

Right Side

NOTE:
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.

All dimensions are in millimeters (in).
Eight-inch minimum clearance above unit required for air exhaust.
Keep cabinet within 15 degrees of vertical while handling.
Top and bottom cable entry available through removable access plates. Remove access plate,
punch to suit conduit size and replace.
Color - black.
Unit bottom is structurally adequate for forklift handling.
M10 threaded mounting holes used for seismic anchoring or floor stand.
NOTE: If floor stand is used, the weight of the unit must be supported under all casters.
Each mounting location is supported by two 10 ga. (.135") galvanized steel. The threaded
insert is approximately 3/4" deep. Mounting holes are underneath unit base; mounting bolts
must be threaded into unit.
Side panels must be removed from adjacent units that are bolted together.
Leveling feet are not designed to carry the full weight of the cabinet. Finger-tighten leveler
against the floor, then tighten with a wrench less than 2 turns for friction fit against floor.

68

Installation Drawings

Figure 43 Outline drawing, Liebert® NX™ 480V 49" parallel cabinet

1240
(48.8)

965
(38)
2000
(78.7)

Top

Right Side

Front

NOTE:
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.

All dimensions are in millimeters (in).
Eight-inch minimum clearance above unit required for air exhaust.
Keep cabinet within 15 degrees of vertical while handling.
Top and bottom cable entry available through removable access plates. Remove access plate punch to
suit conduit size and replace.
Color - black.
Unit bottom is structurally adequate for forklift handling.
M10 threaded mounting holes used for seismic anchoring or floor stand.
NOTE: If floor stand is used, the weight of the unit must be supported under all casters.
Each mounting location is supported by two 10 ga. (.135") galvanized steel. The threaded insert is
approximately 3/4" deep. Mounting holes are underneath unit base; mounting bolts must be threaded
into unit.
Side panels must be removed from adjacent units that are bolted together.
Leveling feet are not designed to carry the full weight of the cabinet. Finger-tighten leveler against
the floor, then tighten with a wrench less than 2 turns for friction fit against floor.

69

Installation Drawings

Figure 44 Liebert® NX™ 480V paralleling cabinet with input and bypass circuit breakers, main components

System
Input
System Output
Tie Breaker

UPS Output
Breaker

UPS
Input
Breakers

Kirk - Key
Fuse
Disconnect

Ground
Busbar
System
Bypass
Tie Breaker

Rear

Front

70

System
Output
Busbar

Installation Drawings

Figure 45 Liebert® NX™ 480V paralleling cabinet main components—input, bypass and distribution circuit
breaker configuration

System Input

UPS Input
Ground
Bus

Bypass
Tie
Breaker

Front
With Covers

Front
Without Covers

Output
Distribution

Bypass
Tie
Breaker

Rear
Without Covers

Rear
With Covers

71

UPS
Output

Installation Drawings

Figure 46 Main component location drawing Liebert® NX™ 480V, CB2, CB3, CB4 configurations

System
Bypass

UPS
Output
Breakers

Kirk-Key
Fuse
Disconnect

Ground
Busbar

FRONT

72

System
Output
Busbars

Installation Drawings

Figure 47 Liebert® NX™ 480V 40-120kVA UPS to Paralleling Cabinet Interconnection—Configuration BB0,
FB0, KB0 parallel connection to Liebert NX

G1-G4
H1-H4

A
B1-B4

G1-G4
H1-H4

FRONT
Without Covers
C1-C4

B1-B4

FRONT
Door Open

C1-C4

E1-E4
F

D

REAR
Without Covers

E1-E4

Run

From

To

Conductors

A

Utility Source

Parallel Cabinet

Ph A, B, C - System
Input

B1-B4

Parallel Cabinet

UPS #1-UPS #4 Module
AC Input

Ph A, B, C - UPS
Inputs

C1-C4

UPS #1-UPS #4
Module AC Output

Parallel Cabinet

Ph A, B, C UPS Outputs

D

Parallel Cabinet

Critical Loads

Ph A, B, C - System
Outputs

E1-E4

Parallel Cabinet

UPS #1-UPS #4
Module Gnd

Ground - UPS

F

Parallel Cabinet

Building Gnd

Ground - System

G1-G4

Parallel Cabinet

UPS #1-UPS #4 Module
Output Breaker Aux
UPS Parallel Logic
Contact
Board (M3)

H1-H4

Parallel Cabinet

UPS #1-UPS #4 Module
UPS Parallel Logic
Board (M3)

73

UPS Bypass
Detection

Installation Drawings

Figure 48 Interconnecting details for Liebert® NX™ 40-120kVA UPS to paralleling cabinet with input,
bypass and distribution circuit breakers

A

G1-G4,
H1-H4

B1-B4
E1-E4, F
G1-G4,
H1-H4

FRONT
Without Covers

D
B1-B4

E1-E4

C1-C4

FRONT
With Door Open

C1-C4

REAR
Without Covers

Run

From

To

Conductors

A

Utility Source

Parallel Cabinet

Ph A, B, C - System Input

B1-B4

Parallel Cabinet

UPS #1-UPS #4 Module
AC Input

Ph A, B, C - UPS Inputs

C1-C4

UPS #1-UPS #4 Module
AC Output

Parallel Cabinet

Ph A, B, C - UPS Outputs

D

Parallel Cabinet

Critical Loads

Ph A, B, C - System Outputs

E1-E4

Parallel Cabinet

UPS #1-UPS #4 Module
Gnd

Ground - UPS

F

Parallel Cabinet

Building Gnd

Ground - System

G1-G4

Parallel Cabinet

UPS #1-UPS #4 Module
UPS Parallel Logic Board (M3)

Output Breaker Aux Contact

H1-H4

Parallel Cabinet

UPS #1-UPS #4 Module
UPS Parallel Logic Board (M3)

UPS Bypass Detection

74

Installation Drawings

Figure 49 Lineup detail—Configuration CB2, CB3, CB4 parallel connection to Liebert® NX™

G1-G4
H1-H4

C1-C4

E1-E4
F

G1-G4
H1-H4

D
C1-C4

B1-B4

FRONT
Without Covers

FRONT
Door Open

E1-E4

Run

From

To

Conductors

B1-B4

Utility

UPS #1-UPS #4 Module AC
Input

Ph A, B, C - UPS Inputs

C1-C4

UPS #1-UPS #4
Module AC Output

Parallel Cabinet

Ph A, B, C - UPS Outputs

D

Parallel Cabinet

Critical Loads

Ph A, B, C - System Outputs

E1-E4

Parallel Cabinet

UPS #1-UPS #4 Module Gnd

Ground - UPS

F

Parallel Cabinet

Building Gnd

Ground - System

G1-G4

Parallel Cabinet

UPS #1-UPS #4 Module
UPS Parallel Logic Board (M3)

Output Breaker Aux Contact

H1-H4

Parallel Cabinet

UPS #1-UPS #4 Module
UPS Parallel Logic Board (M3)

UPS Bypass Detection

75

Installation Drawings

Figure 50 Line-up detail, bolt together description, 40-120 kVA Liebert® NX™

LEFT SIDE
Without Exterior Panels
965
(38 in.)

LEFT SIDE
Isometric View
NOTES:
1. All dimensions are in millimeters (inches)
2. All cables should be routed before bolting
cabinets together.
3. The cables between the auxillary cabinets
and the UPS cabinet must be supplied by customer.
4. All hardware supplied with ancillary cabinets
for bolting cabinet to UPS.
5. Use M6 hardware provided. Assemble as
shown in detail drawing.
6. All external wiring is to be in accordance
with national and local codes.

2000
(78.7 in)
Remove
when cabinets
are to be bolted
together

DETAIL A
U3819301
A

RIGHT SIDE
Without Exterior Panels
76

Operation

9.0

OPERATION

9.1

General Description
Liebert’s NX provides continuous, high-quality AC power to your business-critical equipment, such as
telecommunications and data processing equipment. The Liebert® NX™ UPS supplies power that is
free of the disturbances and variations in voltage and frequency common to utility power, which is
subject to brownouts, blackouts, surges and sags.
The Liebert NX utilizes the latest in high-frequency, double-conversion pulse width modulation
technology and fully digital controls to enhance its reliability and increase the ease of use.
Specifically, the Liebert NX 480V utilizes soft-switching technology to greatly enhance efficiency.
As shown in Figure 51, the AC utility source is input at CB1 and the rectifier converts the AC utility
into DC power. The inverter converts that DC power from the utility—or DC power from the
batteries—into AC power for the load. The batteries power the load through the inverter in the event
of a power failure. The utility source can also power the load through the static bypass.
If maintenance or repair of the UPS is necessary, the load can be switched without interruption in
service to the maintenance bypass.

Figure 51 Single module block diagram (dual input configuration)

3-Phase
3W + Gnd

Internal Maintenance Bypass

3-Phase
3W + Gnd

Static Bypass

Rectifier

AC Input

Inverter

Converter

UPS Cabinet
2W + Gnd

Battery Cabinet

77

3-Phase
3W + Gnd
AC Output

Operation

9.1.1

Bypass Supplies
The Liebert® NX™ contains an electronically controlled switching circuit that enables the critical load
to be connected to either the inverter output or to a bypass power source via the static bypass line.
During normal system operation the load is connected to the inverter and the inverter contactor is
closed; but in the event of a UPS overload or an inverter failure, the load is automatically transferred
to the static bypass line.
To provide a clean (no-break) load transfer between the inverter output and static bypass line, the
bypass static switch activates, connecting the load to bypass. To achieve this, the inverter output and
bypass supply must be fully synchronized during normal operating conditions. This is achieved
through the inverter control electronics, which make the inverter frequency track that of the static
bypass supply, provided that the bypass remains within an acceptable frequency window.
A manually controlled, maintenance bypass supply is incorporated into the UPS design. It enables the
critical load to be powered from the utility (bypass) supply while the UPS is shut down for routine
maintenance.
NOTE
When the UPS is operating in bypass mode or on maintenance bypass, the connected
equipment is not protected from power failures or surges and sags.

9.1.2

Operating Modes
The UPS is designed to operate as an on-line, double-conversion, reverse-transfer system in the
following modes:

Normal Mode
Operating in normal mode, the Liebert NX’s rectifier derives power from a utility AC source and
supplies regulated DC power to the inverter, which regenerates precise AC power to supply the
connected equipment. The rectifier also uses the utility source power to charge the batteries.

Battery Mode
When utility AC power fails, the Liebert NX protects the critical load by instantaneously channeling
battery power to the inverter, which continues supporting the critical load without interruption.
When utility power returns and is within acceptable limits, the Liebert NX automatically shifts back
to Normal mode, with the rectifier powering the critical load.

Bypass Mode
When the Liebert NX is in bypass mode, the load is directly supported by utility power and is without
battery backup protection.
The Liebert NX’s inverter static switch and bypass static switch will shift the load from the inverter
to bypass mode without an interruption in AC power if the inverter is synchronous with the bypass
and any of the following occurs:
• inverter fails
• inverter overload capacity is exceeded
• inverter is manually turned off by the user
NOTE
If the inverter is asynchronous with the bypass, the static switch will transfer the load from the
inverter to the bypass WITH interruption in AC power to the critical load. This interruption
will be less than 10ms. This interruption time may be altered by modifying the Output transfer
interrupt time setting.

78

Operation

Maintenance Mode
For maintenance or repair, the Liebert® NX™ may be operated in maintenance mode. To place the
Liebert NX in maintenance mode, the load must be transferred to bypass and the inverter must be
turned off. When those conditions are met, the CB3 may be turned on and the UPS may be shut down,
permitting disconnecting the batteries for maintenance.

! WARNING
Risk of electrical shock. Can cause injury and death.
The UPS input and output must be protected with external overcurrent protection devices. In
maintenance mode, the input and output busbars remain energized.

NOTICE
Risk of improper operation. Can cause loss of power to the load and damage to the UPS.
The internal maintenance bypass must not be used when the UPS system is in a parallel
system. Doing so can cause a backfeed that can damage the UPS and interrupt power to the
load.

Parallel Redundancy Mode (System Expansion)
For higher capacity, higher reliability or both, the outputs of up to four UPS modules can be
programmed for directly paralleling while a built-in parallel controller in each UPS ensures
automatic load-sharing.

Frequency Converter Mode
The Liebert NX can be programmed into frequency converter mode for either 50Hz or 60Hz stable
output frequency. The input frequency may vary from 57Hz to 66Hz. In this mode, the static bypass
operation is disabled and the battery becomes optional, depending on any requirement to operate in
battery mode (stored energy mode).

Eco Mode
If ECO mode is selected, the double-conversion UPS operation is inhibited at most times for the
purpose of saving energy. In this mode of operation, not unlike UPS of line-interactive or stand-by
technology, the bypass is the preferred source, and only when the voltage and/or frequency of the
bypass supply is beyond pre-defined and adjustable limits is the critical AC load transferred to the
inverter. This transfer takes place with an interruption of less than 3/4 of an electrical cycle, e.g., less
than 15ms (50Hz) or less than 12.5ms (60Hz).

79

Operator Control and Display Panel

10.0 OPERATOR CONTROL AND DISPLAY PANEL
10.1

Operator Control Panel
The control panel and LCD on the front of the Liebert® NX™ lets the operator:
•
•
•
•

turn the UPS On or Off
transfer into the various operating modes
silence alarms
check the status of the UPS and its batteries, including all measured parameters, events and
alarms

The main areas of the control panel are shown below in Figure 52 and detailed in Figure 53.
• Mimic Display - view the status of the Liebert NX in single-line diagram format—indicators
show status by changing color when ON, flashing or OFF
• Liquid Crystal Display (LCD) and Navigation keys - view status and operational data from
the Liebert NX in tabular format
• Control buttons - turn the Liebert NX on or off, silence alarms
Figure 52 Overview of control panel

Liebert NX
80kV A-3X 3

Liquid Crystal
Display (LCD)

Main

LED1

Mimic
display

L-N current(A)
Frequency (HZ)
L-L voltage (V)

LED4

LED2

P owerFactor

LED5

2007-01-06
S ingle

L1-N/L2
71. 4

L2-N/L 3
70. 8

59. 9

59. 9

480
0.99

480
0.99

Input disconnect closed
Output disconnect closed
Bypass abnorm al

LED3

09:20:37
Norm al
Output

Bypass

59. 9
480
0. 99

EPO
INVER TER OFF

01-06 09:15
01-06 09 :15
01-06 09:15

F1

F2

F3

F4

FAULT C LEAR

SILENC E ON/ OFF

Control
buttons

INVER TER ON

?

STATUS

Navigation
keys

L3-N/L 1
71. 3

HELP

30kVA 3X3

10.1.1 Display Panel Layout

Figure 53 shows the control panel in greater detail, identifying individual items that are described in
the rest of this section.
Figure 53 Detailed view of control panel
1

2

3

4

5

6

8

9

10

11

7

12
13

14

Mimic indicators
1. Rectifier indicator
2. Battery indicator
3. Inverter indicator
4. Bypass indicator
5. Load indicator
6. Status indicator
7. Buzzer

15

16

17

18

19

Control buttons
8. Inverter Off Button
9. Emergency Power Off Button
10. EPO Cover
11. Fault Clear Button
12. Silence On/Off Button
13. Inverter On Button
14. LCD

80

Navigation keys
15. F1
16. F2
17. F3
18. F4
19. Help

Operator Control and Display Panel

10.2

Mimic Display Indicators
The Mimic display on the front panel consists of six indicators arranged in a single-line diagram
depicting the various paths of UPS power, as shown in Figure 54.

Figure 54 Mimic display indicators location

Load indicator

Bypass indicator
Inverter indicator

Liebert NX
80kV A-3X 3
Main

LED1

Rectifier indicator
LED2

LED4

LED5

LED3

Buzzer

STATUS

09:20:37
Norm al

Bypass

L1-N/L 2
L-N current (A) 71. 4
Frequency (HZ) 59. 9
L-L voltage (V )
480
P owerFactor

Battery indicator

2007-01-06
S ingle

0. 99

Input disconnect closed
Output disconnect closed
Bypass abnorm al

Output
L 2-N/ L3
70.8
59.9

L 3-N/ L1
71.3
59.9
480
0.99

480
0. 99

EPO
INVER TER OFF

01-06 09:15
01-06 09:15
01-06 09 :15
?

Status indicator

F1

F2

F3

F4

FAULT C LEAR

SILENC E ON/ OFF
INVER TER ON

HELP

The current operational status of the Liebert® NX™ is indicated by the color of the indicators—green,
amber or red—and whether they are ON (solid), flashing or OFF. Table 27 provides a guide to
interpreting the various states of the indicators.
Table 27

Mimic display status indicators

Indicator
(see
Figure 54)

Green

Flashing Green / Amber

Red

Off

Rectifier

Load on rectifier

Flashing Green: Utility normal,
Rectifier fault
but rectifier not operating

Battery

Battery powering
the load

Flashing Green: Battery prewarning (low battery)

Battery and converter are
Battery or battery
normal, and battery is not
converter abnormal*
discharging

Inverter

Inverter powering
the load normally

Flashing Green: Inverter on
standby

Inverter fault

Inverter normal, but off

Bypass

Load on Bypass
power

—

Bypass out of
normal range

Bypass Normal

Load

UPS output on

—

UPS output
overloaded

UPS no output power

Status

No alarms—UPS
working normally

Amber: UPS has a general
alarm

UPS has a serious
alarm

Rectifier is normal, but utility is
abnormal

—

* Battery or battery converter abnormal events include these event messages (see Appendix A): No Battery, Battery Replaced, Battery
Reverse, Batt. Conv. Over. Curr., Batt. Converter Fault, Batt. Converter Overtemp.

81

Operator Control and Display Panel

10.3

Control Buttons
The Control Buttons on the front panel may be used to shut down the UPS completely, turn the
inverter On or Off, restart the UPS after a fault and silence the alarm, as shown in Figure 55. The
function of each button is described in Table 28.
NOTE
To activate a button properly, press and hold until you hear a short beep—about two seconds.

Figure 55 Location of control buttons

Button cover
EPO button
Liebert NX
80kV A-3X 3
Main

LED1

L-N current (A)

LED2

LED4

LED5

LED3
STATUS

09:20:37
Norm al

Bypass
L1-N/L 2
71. 4

Frequency (HZ) 59. 9
L-L voltage (V )
480
P owerFactor
0. 99

L 3-N/ L1
71.3
59.9
INVER TER OFF

01-06 09:15
01-06 09:15
01-06 09 :15

F3

F4

Fault Clear button

EPO

480
0.99

FAULT C LEAR

SILENC E ON/ OFF

?

F2

Inverter Off button

Output
L 2-N/ L3
70.8
59.9
480
0. 99

Input disconnect closed
Output disconnect closed
Bypass abnorm al

F1

Table 28

2007-01-06
S ingle

INVER TER ON

Silence On/Off button
Inverter On button

HELP

Control buttons

Button
(see Figure 55)

Function

EPO

Completely shuts down the UPS, including the static switch.
CAUTION: Use caution before pressing the Emergency Power Off (EPO) button. This button
completely shuts down the unit and cuts off power to the critical load.

Inverter Off

Press this button to shut down the inverter during operation. The load will be transferred to
static bypass.

Fault Clear

After the UPS shuts down due to a fault and the alarm condition has been resolved, press
this button to clear the fault and restart the UPS.

Silence On/Off

Press this button once to silence the alarm buzzer when an alarm is active. Any new fault will
sound the buzzer again.
If the alarm buzzer is not beeping, press this button to test the alarm sound.

Inverter On

Press this button to start the inverter and transfer from static bypass to inverter.
NOTE: If the inverter is not ready, this will not activate the UPS.

82

Operator Control and Display Panel

10.4

Audible Buzzer
The buzzer produces three types of sounds:
• Single beep - when any control button is pressed
• Single beep repeating every two seconds - the system has a general alarm
• Continuous - the system has a serious fault
If the buzzer makes no sound, the system may be operating properly, or an alarm may have been
silenced manually.

Figure 56 Buzzer location
Liebert NX
80kV A-3X 3

LED1

LED2

LED4

2007-01-06
S ingle

Main
L-N current (A)
Frequency (HZ)

LED5

L-L voltage (V )
P owerFactor

LED3

59.9

59.9

480
0. 99

480
0. 99

L3-N/ L1
71.3
59.9
480
0.99

EPO
INVER TER OFF

01-06 09:15
01-06 09:15
01-06 09:15

F2

F3

F4

FAULT C LEAR

SILENC E ON/OFF
INVER TER ON

?

F1

10.5

L2-N/ L3
70.8

L 1-N/ L2
71.4

Input disconnect closed
Output disconnect closed
Bypass abnorm al

STATUS

Buzzer

09:20:37
Norm al
Output

Bypass

HELP

LCD Overview
The LCD on the front panel has five main sections, as shown in Figure 57. Press the F1 key below
the LCD to scroll through these sections.
• UPS System Information - view UPS name and model, date and time, overall status (see
Table 30).
• LCD Menu - choose a category of data items to appear below the menus (see Table 31).
• Data and Settings - view data items for the selected menu (see Table 31).
• Current Status Messages - check any active UPS event and alarm messages (see Appendix A).
• Navigation Key Icons - look at the icon above each navigation key to determine how the key
operates when pressed (see 10.6 - Navigation Keys).
The LCD displays alarm information in real time. After appearing in the current status section of the
LCD, status messages are stored in the history log—512 records can be stored and retrieved.

Figure 57 Sections of the LCD
Liebert NX
80kVA-3X3

LCD menu

Data and settings

Current status
messages

Main
L-N current (A)
Frequency(HZ)
L-L voltage(V)
PowerFactor

2007-01-06
Single
Bypass
L1-N/L2
71.4
59.9
480
0.99

09:20:37
Normal
Output

L2-N/L3
70.8
59.9
480
0.99

Input disconnect closed
Output disconnect closed
Bypass abnormal

L3-N/L1
71.3
59.9
480
0.99

01-06 09:15
01-06 09:15
01-06 09:15
?

F1

F2

F3

83

UPS system
information

F4

HELP

Navigation
key icons

Operator Control and Display Panel

10.6

Navigation Keys
The navigation keys on the front panel—F1 through F4 and Help—are used to access the LCD to view
the current status and other information about the Liebert® NX™.
Navigation key icons on the LCD appear above each key to indicate its operation (see Table 29). The
keys are “soft keys” that can change functions according to the icon.
• Use F1 either to move to a different portion of the LCD (Shift icon) or to escape to a previous view
(ESC icon).
• Use F2 and F3 as cursor keys to move left and right or up and down, depending on the icons displayed above the keys.
• Use F4 as an Enter key to confirm a choice.
• Use HELP to access help information on the LCD.
Table 29

Icons for navigation keys

Key

Functions
Available

F1

F2

F3

Shift

Left

Right

ESC
Exit

10.7

F4

?
Enter

Up

Down

UPS System Information
The UPS system information displayed at the top of the LCD is detailed in Table 30.
Table 30

Description of items in UPS system window

Item Type
Liebert NX
2007-10-12
12:30:36
080kVA-3x3
Unit #1
Single
Normal
Warning
Fault

Explanation
UPS name
Current date
Current time
080 means UPS model is 80kVA;
3x3 means 3 by 3 system (three-phase input and three-phase output)
#1 of 6 Paralleled changed to “Unit #1”
UPS is configured as a single unit system running in Normal mode
UPS in normal operation, inverter powering load, no warnings
UPS has a general alarm
UPS has a serious fault

84

HELP

Help

Operator Control and Display Panel

10.8

LCD Menus and Data Items
The LCD menus provide access to the following categories of information and settings for the UPS.
Selecting a menu changes the information displayed in the UPS data items portion of the LCD. The
menu choices are listed below and described in detail in Table 31.
•
•
•
•
•
•
•
•
•
•
•
•

Mains - view utility power input data: voltage, current, frequency and power factor
TX Input - view input transformer voltages
Bypass - view bypass data: voltage and frequency
Output - view output data: voltage, current, frequency and power factor
Load - view load data: load percent, output current, output power and crest factor (CF)
System - view system data
Battery - view battery characteristics—voltage, current, temperature and remaining time—and
messages when the battery is boost/float charging or disconnected
Records - access the history log—displays all records in the log (newest records added at end)
Language - select a language for LCD text (choices appear in the native language)
Settings - configure UPS settings: adjust the display contrast, choose a format for date display,
set the date and time, set up the UPS for modem communications (baud rate, address, mode and
phone numbers to dial for alarm notifications) and change the password
Command - start or stop a battery maintenance test, battery capacity test or system test
Version - view firmware versions for the inverter, rectifier and software display board and the
model information for the UPS

Figure 58 shows a menu tree of the options available from the LCD menus.

85

Operator Control and Display Panel

Figure 58 Menu tree
Mains (input)

TX Input *

Bypass

Output

TX Output **

L-N current (A)
Frequency (Hz)
L-L voltage (V)
Power factor

L-L voltage (V)

Frequency (Hz)
L-L voltage (V)

L-N current (A)
Frequency (Hz)
L-L voltage (V)
Power factor

L-L voltage (V)

Load

System

Battery

Records

Sout (kVA)
Pout (kW)
Qout (kVAR)
Loadlevel %
Crest factor

Sout (kVA)
Pout (kW)
Qout (kVAR)
Single unit, no
parallel data

Battery voltage (V)
Battery current (A)
Battery temperature (°C)
Remain Time Min.
Battery boost charging
Battery float charging
Battery disconnected

(history log)

Language

Settings

Command

(Choices for
display)

Display contrast
Date format set
Date & time
Comm1 baud rate
Comm2 baud rate
Comm3 baud rate
Communication address
Communication mode
Callback times
Phone No.1
Phone No.2
Phone No.3
Command password
Audible Alarm

Battery maintenance test
UPS model
Battery capacity test
Monitor version
System test
Rectifier version
Stop testing
Inverter version
Freshening Charge
Stop Freshening Charge
Modem auto-answer enable
Battery Commission
* When configured, input transformer voltages are
displayed on the front LCD. When not activated, the
values are hidden.
** When configured, output transformer voltages are
displayed on the front LCD. When not activated, the
values are hidden.

Table 31

Descriptions of UPS menus and data window items

Menu Type
Mains
(input)
TX Input
Bypass

Output

TX Output

Load

Version

Item Type

Explanation

L-N current (A)

Phase current

Frequency (Hz)

Input frequency

L-L voltage (v

Line-line voltage

Power factor

Power factor

L-L voltage (V)

Line-line voltage

Frequency (Hz)

Bypass frequency

L-L voltage (A)

Line-line voltage

L-N current (A)

Phase current

Frequency (Hz)

Output frequency

L-L voltage (V)

Line-line voltage

Power factor

Power factor

L-L voltage (V)

Line-line voltage

Sout (kVA)

Sout: Apparent power

Pout (kW)

Pout: Active power

Qout (kVAR)

Qout: Reactive power

Loadlevel %

The percent of the UPS rating load

Crest factor

Output current Crest Factor

86

Operator Control and Display Panel

Table 31

Descriptions of UPS menus and data window items (continued)

Menu Type

System

Battery

Item Type

Explanation

Sout (kVA)

Sout: Apparent power

Pout (kW)

Pout: Active power

Qout (kVAR)

Qout: Reactive power

Single unit, no parallel data

When configured as a single unit, UPS has only native load, no system load.

Battery voltage (V)

Battery bus voltage

Battery current (A)

Battery bus current

Battery temperature (°C)

Internal battery temperature °C

Remain Time Min.

Battery run time remaining.

Battery boost charging

Battery is boost charging.

Battery float charging

Battery is float charging.

Battery disconnected

Battery is not connected.

Records

(History Log)

Displays all records in the history log.

Language

(choices for text displayed)

User may select any of 12 languages for LCD text.

Display contrast

Adjust the LCD contrast

Settings
Settings

Command
(start / stop
battery &
system
tests)

Version

Date format set

Choose the format for date display: M/D/Y, D/M/Y, M/D/Y, Y/M/D

Date & time

Set the date and time

Comm1 baud rate

Communication baud rate setting for Liebert IntelliSlot 1

Comm2 baud rate

Communication baud rate setting for Liebert IntelliSlot 2

Comm3 baud rate

Communication baud rate setting for Liebert IntelliSlot 3

Communication address

This setting is applicable to RS485 communication mode.

Communication mode

Communication Mode Setting

Callback times

When Liebert IntelliSlot 1 Communication mode is Modem, this parameter
sets the number of times a number is redialed to send an alarm notification.

Phone No.1

When Liebert IntelliSlot 1 Communication mode is Modem, this is the first
phone number to be dialed (to send an alarm notification).

Phone No.2

When Liebert IntelliSlot 1 Communication mode is Modem, this is the second
phone number to be dialed (to send an alarm notification).

Phone No.3

When Liebert IntelliSlot 1 Communication mode is Modem, this is the third
phone number to be dialed (to send an alarm notification).

Command password

User can modify the command password.

Audible Alarm

User can Enable and Disable the UPS audible alarm.

Battery maintenance test

This test performs a partial discharge of the battery to obtain a rough estimate
of the battery capacity. Load must be between 20% and 80%.

Battery capacity test

This test performs a full discharge of the battery to obtain a precise measure of
the battery capacity. Load must be between 20% and 80%.

System test

This is a self-test of the UPS. When the user activates this function, a pop-up
window appears about 5 seconds later to show the results.

Stop testing

Manually stops a battery maintenance test, battery capacity test or system
test.

Freshening Charge

Allows a temporary Equalize charge for the batteries. This charge is
configurable for 1 to 36 hours.

Stop Freshening Charge

Manually stops a Freshening Charge.

Modem Auto-answer
enable

Manually enable the modem’s auto-answer function.

Battery Commission

Resets the UPS battery detection logic after new/fresh batteries are installed.

UPS version

Provides UPS firmware version numbers for the inverter, rectifier and software
display board.

UPS model

Provides UPS model information—for example, 480V-60Hz.

87

Operator Control and Display Panel

10.9

Language Selection
The LCD menus and data display are available in 12 languages (Chinese, Dutch, English, French,
German, Italian, Japanese, Polish, Portuguese, Russian, Spanish and Swedish). To select a different
language:
• From the main menu, press the F1 (Shift) key to move the cursor to the menu at the top of the
screen.
• Press F2 and F3 (left and right arrows) as needed to select the Language menu.
• Press F1 (shift) to move the cursor to the data and settings area of the LCD.
• Use F2 and F3 (up and down) to select the required language.
• Press the F4 (enter) key to accept the language selection.
• Return to the main menu by repeatedly pressing F1 (ESC) as needed; all text on the LCD will now
be displayed in the selected language.

Figure 59 Language selection

2007-01-12
Single

Liebert NX
80KVA-3X3
Battery

POLSKI
ESPAÑOL

History

12:30:36
Normal
Language

English

DEUTSCH

FRANCAIS

ITALIANO

NEDERLANDS

SVENSKA

РУССКИЙ
Input disconnect closed
Output disconnect closed
Bypass disconnect open

PORTUGUêS
01-12 12:30
01-12 12:30
01-12 12:30

?
F1

F2

F3

F4

HELP

10.10 Current Date and Time
To change the system date and time:
• From the main menu, press the F1 (shift) key to move the cursor to the menu at the top of the
screen.
• Press F2 and F3 (left and right arrows) as needed to select the Settings menu.
• Press F1 (shift) to move the cursor to the data and settings area of the LCD.
• Use F2 and F3 (up and down) to select the Date & Time option, then press F4 (enter).
• Position the cursor on the row in which the date and time are displayed, then press F4 (enter).
• Using the F2 and F3 (up and down) keys, enter the current time and date information.
• Press F4 (enter) to save the settings, then press F1 (ESC) to return to the main menu.

88

Operator Control and Display Panel

Figure 60 Set date and time

2007-01-12
Single

Liebert NX
80KVA-3X3
Language

12:30:36
Normal

Setting

Command

D/M/Y

Y/M/D
Y/M/D

LCD contrast
Date format
M/D/Y
Date & Time
2007-01-12

12:30:36

Input disconnect closed
Output disconnect closed
Bypass disconnect open

01-12 12:30
01-12 12:30
01-12 12:30

?
F1

F2

F3

89

F4

HELP

Operator Control and Display Panel

10.11 UPS Status Messages
The Liebert® NX™ displays status changes as they occur in the current status window of the LCD,
then stores that data in the history log, as shown in Figure 61.
• Current Status Window: The status messages are displayed chronologically and include the
date and time of the events. Three status messages are visible in the window at a time. To see
other messages, use the navigation keys to scroll up or down the list. A status message remains in
the current status area of the LCD until the status changes, when it is moved to the history log.
• History Log: When a record moves to the history log, the time the status changed is recorded.
The history log can hold up to 512 records. History log records may be viewed by accessing the
Records menu.
Figure 61 Current status and history log records

2007-01-12
Single

Liebert NX
80KVA-3X3

History

Battery

12:30:36
Normal
Language

Inverter in setting
2003-01-21
2003-01-21

12 :21:12
12 :21:12

2003-01-21
2003-01-22

12 :21:12
12 :30:16

2003-01-21
2003-01-21

12 :21:12
12 :30:16

UPS shutdown

History Log
(records
menu)

Bypass abnormal

Current
Status
Messages

Input disconnect closed
Output disconnect closed
Bypass disconnect open

01-12 12:30
01-12 12:30
01-12 12:30

?
F1

F2

F3

F4

HELP

See Appendix A for a complete list of status messages, along with a description and any
recommended actions.

90

Operator Control and Display Panel

10.12 Types of LCD Screens
This section provides a quick guide to the main types of LCD screens.

10.12.1Opening Display
As the UPS begins powering up, the opening display appears, as shown in Figure 62.
Figure 62 Opening display

F1

F2

F3

HELP

F4

10.12.2Default Screen
After the UPS has powered up and completed a self-test, the output screen appears, as shown in
Figure 63. This window is the default screen.
Figure 63 Default screen

2007-01-12
Single

Liebert NX
80KVA-3X3
Main
L-N current(A)
Frequency(HZ)
L-L voltage(V)
PowerFactor

Bypass
L1-N/L2
71.4
59.9
480
0.99

12:30:36
Normal
Output

L2-N/L3
70.8
59.9

480
0.99

480
0.99

Input disconnect closed
Output disconnect closed
Bypass disconnect open

L3-N/L1
71.3
59.9

01-12 12:30
01-12 12:30
01-12 12:30

?
F1

F2

F3

91

F4

HELP

Operator Control and Display Panel

10.12.3UPS Help Screen
Press the HELP key below the LCD to display the Help window shown in Figure 64. (Press the
HELP key again to exit the Help window.)
Figure 64 Help screen

Help information
Select the current record window
Select the previous menu item
Select the next menu item
Press ENTER key to view KVA history
Press ENTER
Q3 key to view KVA history
Q2
Q5

Q1

Press help key back to main menu
Press help key back to main menu
F1

F2

F3

F4

?
HELP

10.12.4Screen Saver Window
If there has been no interaction with the Liebert® NX™ LCD for 2 minutes, the screen saver window
appears. It remains on the LCD for 2 minutes, then the screen will go dark. The LCD will become
active again when any key is pressed.
Figure 65 Screen saver window
2007-01-12
Single

Liebert NX
80KVA-3X3

12:30:36
Normal

Press any key back to main menu
F1

F2

F3

92

F4

F5

Operator Control and Display Panel

10.13 Pop-Up Windows
Pop-up prompt windows appear when the user must confirm a choice or perform an operation. This
section describes the pop-up windows.

10.13.1From Bypass to Inverter Mode With Power Interruption
If the bypass voltage or frequency exceeds the synchronized range and
utility voltage or frequency is normal, the inverter cannot be in
Transfer with Interrupt,
please confirm or cancel
synchronization with the bypass, and the output can transfer to
inverter only after an interruption of about 15ms when the user
presses the INVERTER ON button. Before transferring, the system
will let the user confirm whether the interruption can be accepted, as shown at right. If the bypass
voltage returns to normal before the user makes confirmation, the UPS will transfer to inverter mode
automatically. At the same time, the prompt window will close.

10.13.2From Inverter to Bypass Mode With Interruption
If the bypass voltage or frequency exceeds the synchronized range and
the UPS is in inverter mode, the user must confirm and accept the
This operation leads to
power interruption danger before pressing the INVERTER OFF
output shutdown,
Confirm or cancel
button to shut down the output of the inverter. The user can also
cancel the shutdown operation, as shown at right. If the bypass voltage
returns to normal before the user makes the confirmation, the UPS
will transfer to bypass operation mode automatically, and at the same time the prompt window will
close disappear soon.

10.13.3System Self-Test
When a system self-test is completed, a pop-up window reports the
results of the test, as shown at right.
• Press the F4 (Enter) key and the pop-up window closes.

System Self-Test finished,
Everything is OK

10.13.4Battery Capacity Test Confirmation
When a battery capacity test is started from the Command menu, the
battery will be discharged to low-battery warning level. The Liebert®
NX™ asks for confirmation before the test is started, as shown at right.

Battery will be depleted,
Confirm or cancel

• To confirm the choice and begin the battery capacity test, press the
F4 (Enter) key and the pop-up window disappears.
• To cancel the test, press the F1 (ESC) key. The pop-up window closes.
NOTE
For a battery capacity test to function properly, the load must be between 20% and 100%.

10.13.5Battery Self-Test Aborted, Condition Not Met
When a battery capacity test is started from the Command menu and
the battery self-test criteria are not met, the Liebert NX will not
perform a battery test. User should check whether the battery state is
boost charging and whether the load level is greater than 20 percent.

Battery Self-Test aborted,
Conditions not met

• Press the F4 (Enter) key and the pop-up window closes.

10.13.6Battery Refresh Charge Aborted, Condition Not Met
When a battery refreshening charge is started from the Command
menu and battery refreshening condition fails to meet requirements,
the Liebert NX will not perform a battery refreshening charge. User
should check if boost charging condition has not met the test criteria,
such as (No battery, charger failed, etc.).
• Press the F4 (Enter) key and the pop-up window closes.

93

Battery Refresh Charge
aborted,
Conditions not met

Operating Instructions

11.0 OPERATING INSTRUCTIONS
11.1

Liebert® NX™ Operating Modes
The Liebert NX can operate in any of four modes, as shown in Table 32. This section provides
instructions on switching between modes, resetting the UPS, switching the inverter On and Off and
performing other operations.
Table 32

UPS operating modes

Operating Mode

Circuit Breaker
State

Description

Normal
Operation

CB1:ON
CB2:ON
CB3:OFF
CB5:ON

The UPS is powering the load.

On Maintenance
Bypass

CB1:OFF
CB2:OFF
CB3:ON
CB5:OFF

The UPS is shut down but the load is connected to utility power via the
Maintenance Bypass Supply line.
NOTE: The load is not protected against disturbances in AC input power in
this mode.

On Test

CB1:ON
CB2:ON
CB3:ON
CB5:OFF

No load power is supplied by the UPS. The load is connected to utility power
via the Maintenance Bypass Supply line.
NOTE: The load is not protected against disturbances in AC input power in
this mode.

On Static Bypass

CB1:ON or OFF
The load power is supplied through the static bypass line. This may be
CB2:ON
considered as a temporary mode during load transfers between inverter and
CB3:OFF
maintenance bypass or supply under abnormal operating conditions.
CB5:ON

NOTE
1. The user controls and indicators mentioned in these procedures are identified in 10.0 Operator Control and Display Panel.
2. The audible alarm may sound at various points during these procedures. It can be canceled
at any time by pressing the SILENCE ON/OFF push button.
NOTE
This section refers to some modes and conditions that are set or adjusted using proprietary
service software. To take advantage of all the available features for the Liebert NX, the unit
must be commissioned by a Liebert factory-trained service engineer.

94

Operating Instructions

11.1.1 Circuit Breakers
The UPS can be isolated by means of circuit breakers, mounted inside the cabinet and accessible after
opening the front door.
The location of the UPS power switches is shown in Figure 66.
Figure 66 Circuit breakers

The UPS unit circuit breakers are CB1, CB2, CB3 and CB5.
•
•
•
•

11.2

CB1—Main Input circuit breaker; connects the utility supply to the UPS main input.
CB2—Bypass circuit breaker; connects the utility supply to the UPS bypass.
CB3—Maintenance Bypass breaker; connects the utility supply to the UPS maintenance bypass.
CB5—Output breaker; connects inverter or bypass to the external output transformer or power
distribution panel.

UPS Startup
The Liebert® NX™ must be fully installed and commissioned before startup, and external power
isolators must be closed. Once those general conditions are met, the UPS may be started.

11.2.1 Startup Procedure
To start the UPS from a fully powered-down condition:
1. Open the UPS door to gain access to the main input circuit breakers.

! WARNING
Risk of electrical shock. Can cause injury and death.
During this procedure the output terminals will become live. If any load equipment is
connected to the UPS output terminals, please check with the load user and ascertain
whether it is safe to apply power to the load. If the load is not ready to receive power, then
ensure that it is safely isolated from the UPS output terminals.
2. Close CB1, CB2 and CB3 (CB5 is open).
The main input contactor closes automatically and the LCD begins to show startup screens. The
Rectifier indicator flashes green while the rectifier is starting up. It stops flashing and becomes
solid green about 30 seconds after the rectifier enters the normal operation state.

95

Operating Instructions

After initialization, the bypass SCR closes. Because the
output circuit breaker is still open, the UPS channels
power through the Maintenance Bypass Supply line
(CB3). The bypass indicator extinguishes, provided that
the bypass is normal.
The opening display is shown in the figure at right.
The UPS Mimic display indicators will be:
Indicator

State

Rectifier indicator

Green

Battery indicator

Red

Bypass indicator

Off

Inverter indicator

Off

Output indicator

Off

Status indicator

Off

F1

F2

F3

F4

HELP

• Close CB5 (CB1, CB2, CB3 and CB5 are closed).
• The Maintenance Bypass supply is now in parallel with the UPS Static Switch supply.
• Verify that the Bypass indicator is Green, then open CB3.
The UPS powers from static bypass instead of from maintenance bypass. The bypass and load
indicators turn on. The design of the hardware and software ensures uninterrupted output.
3. Close external battery circuit breaker.
After the UPS detects that the battery is connected, the red battery indicator extinguishes
moments after the battery charger starts operation.
The UPS Mimic display indicators will be
Indicator

State

Rectifier indicator

Green

Battery indicator

Off

Bypass indicator

Green

Inverter indicator

Off

Output indicator

Green

Status indicator

Amber

4. Press the INVERTER ON control button for 2 seconds.
The inverter will start and the inverter indicator will flash green. After the inverter is ready, the
UPS will transfer from bypass to inverter, the bypass indicator will turn off and the inverter and
load indicators will turn on.
The UPS is operating normally. The UPS Mimic display indicators will:
Indicator

State

Rectifier indicator

Green

Battery indicator

Off

Bypass indicator

Off

Inverter indicator

Green

Output indicator

Green

Status indicator

Green

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Operating Instructions

11.2.2 Verify Switching Between Operation Modes
Switch from Normal Mode to Battery Mode
• Open CB1 to enter battery mode. This breaks the utility connection to the Liebert® NX™.
To return to normal mode, close CB1 after a few seconds. The rectifier will restart automatically
after 10 seconds and resume feeding power to the inverter.

Switch from Normal Mode to Bypass Mode
• Press the INVERTER OFF button to switch to bypass mode.
NOTE
In bypass mode, the load is being powered by the utility and is not receiving conditioned power
through the inverter.

Switch from Bypass Mode to Normal Mode
• In bypass mode, press the INVERTER ON button. When the inverter is ready, the UPS will
switch to normal mode.

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Operating Instructions

11.3

Partially De-Energize the Liebert Nx 480 with Internal Maintenance Bypass
Follow the procedure below to transfer the load from the inverter output to the internal Maintenance
Bypass line of the UPS.

NOTICE
Risk of improper operation. Can cause property damage from loss of power to connected load.
Before performing this operation, read the messages on the LCD to be sure that bypass supply
is regular and the inverter is synchronous with it. If those conditions are not present, there is
a risk of a short interruption in powering the load.
This procedure assumes that the UPS is operating normally.
1. Press the INVERTER OFF button on the operator control panel for longer than 2 seconds.
The Inverter indicator will turn off and the status indicator will turn amber and an audible alarm
will sound. The load will transfer to static bypass and the inverter will shut off.
NOTE
Pressing the Alarm Silence Switch cancels the audible alarm, but leaves the warning message
displayed until the relevant condition is rectified.
2. Close maintenance breaker CB3.
The Maintenance Bypass supply is now in parallel with the UPS Static Switch supply.
3. Open output breaker CB5. This ends the bypass procedure. The load is now powered directly from
the Maintenance Bypass supply.
4. Press the EPO (Emergency Power Off) button at the UPS front panel of this UPS module only.
This will disable further Rectifier, Inverter, Static Switch and Battery operation. This will not
affect the manual maintenance bypass power switch. If a Liebert® NX™ battery cabinet is
connected, the battery circuit breaker will shunt trip open.
5. Open the rectifier switch CB1 and bypass breaker CB2.
All operator indicators and messages will turn off as the utility-driven internal power supplies
decay. The unit will power down, but the load will continue to be supplied by the manual
Maintenance bypass.

! WARNING
Risk of electrical shock. Can cause injury and death.
Wait 5 minutes for the internal DC busbar capacitors to discharge before attempting
to remove the internal protective barriers.

! WARNING
Risk of electrical shock. Can cause injury and death.
Even with the UPS in maintenance bypass and “Off,” portions of the unit are still energized.
Service is to be performed by qualified personnel only.

NOTICE
Risk of loss of power to connected load. Can cause property damage.
The load equipment is not protected from normal supply aberrations when operating in
maintenance bypass mode.
• To return unit to normal operation, follow the steps in 11.2.1 - Startup Procedure.

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Operating Instructions

11.4

Partially De-Energize the Liebert Nx 480 with Bypass Distribution Cabinet (BDC)
Follow the procedure below to transfer the load from the UPS inverter output to the Maintenance
Bypass line of the UPS. To partially de-energize Liebert NX 480V UPS with Liebert BDC:

NOTICE
Risk of load being dropped by the UPS. Can cause equipment damage.
This procedure must be performed by properly trained and qualified personnel who are
knowledgeable about the operation of this system. Failure to follow these instructions will
result in loss of power and possible damage to critical equipment.
Before performing this operation, read any messages on the LCD to be sure that bypass
supply is regular and the inverter is synchronous with it. If those conditions are not present,
there is a risk of a short interruption in powering the load.
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.

On the Control Panel, press the INVERTER OFF button for 2 seconds.
Close the CB3 Maintenance Bypass Breaker.
Open the CB5 Output Breaker.
Manually open the external battery breaker(s).
Open the CB2 Bypass Input Breaker.
Open the CB1 Rectifier Input Breaker.
Verify that the indicator on the SKRU unit is illuminated.
Press and hold the “Alarm Present Silence” button while rotating and removing the key.
Insert the key into the lock on the MBB and turn the key.
Close the MBB.
Verify MBB is closed.

NOTICE

12.
13.
14.
15.

Risk of improper operation. Can cause property damage from loss of power to connected load.
Failure to close the MBB will interrupt power to the load. The load equipment is not protected
from normal supply aberrations when the Liebert® NX™ is operating in the maintenance
bypass mode.
Open the MIB.
Turn the key to complete lockout of MIB.
Remove the key from lock on MIB.
Insert the key into the SKRU lock unit and turn the key.
UPS is now isolated from the critical load.
For a single-input system—The bypass isolation breaker (BIB) remains closed. This allows
power to remain present at the UPS input; refer to Figure 51.
For a single-source, dual-input system—The bypass isolation breaker (BIB) can be opened to
further isolate the UPS from input power; refer to Figure 21.

! WARNING
Risk of electrical shock and arc flash. Can cause property damage, injury and death.
Wait 5 minutes for the internal DC busbar capacitors to discharge before attempting to
remove the internal protective barriers.

! WARNING
Risk of electrical shock and arc flash. Can cause property damage, injury and death.
Even with the UPS in maintenance bypass and Off, portions of the Liebert® NX™ system are
still energized. Service must be performed by properly trained and qualified personnel only.

NOTICE

Risk of improper operation. Can cause property damage from loss of power to connected load.
The load equipment is not protected from normal supply aberrations when the Liebert® NX™
is operating in the maintenance bypass mode.

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Operating Instructions

11.5

De-Energize the Liebert Nx 480 with Bypass Distribution Cabinet (BDC)
To de-energize the Liebert NX 480V UPS w/ BDC:
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.

On the Control Panel, press the INVERTER OFF button for 2 seconds.
Close CB3 Maintenance Bypass Breaker
Open CB5 Output Breaker
Manually open external battery breaker(s).
Open CB2 Bypass Input Breaker
Open CB1 Rectifier Input Breaker
Verify the indicator on the SKRU unit is illuminated
Press and hold the “Alarm Present Silence” button while rotating and removing the key.
Insert the key into the lock on the MBB and turn the key.
Close the MBB.
Verify the MBB is closed.

NOTICE

12.
13.
14.
15.
16.

11.6

Risk of improper operation. Can cause property damage from loss of power to connected load.
Failure to close the MBB will interrupt power to the load. The load equipment is not protected
from normal supply aberrations when the Liebert® NX™ is operating in the maintenance
bypass mode.
Open the MIB
Turn the key to complete the lockout of MIB
Remove Key from MIB lock.
Insert key into the SKRU lock unit and turn the key.
UPS is now isolated from the critical load.
Open CB3 Maintenance Bypass Breaker.

Energize Nx 480 with Bypass Distribution Cabinet (BDC)
To re-energize the partially de-energized Liebert NX 480V UPS with Liebert BDC:
NOTE
UPS system must be in bypass prior to the start of any transfers. Safety features prevent
transferring the load to bypass while the Liebert NX inverter is powering the load.
1.
2.
3.
4.
5.

Verify the indicator on the SKRU unit is illuminated.
Press and hold the Alarm Present Silence button while rotating and removing the key.
Insert the key into the lock on the MIB and turn the key.
Close the MIB.
Verify that the MIB is closed.

NOTICE
Risk of power interruption. Can cause equipment damage.
Failure to close the MIB will interrupt power to the load.
6.
7.
8.
9.

Open the MBB.
Turn the key to complete locking out the MBB.
Remove the key from the MBB lock.
Insert the key into the SKRU lock unit and turn the key.
The UPS system is now available to be returned to normal operations.
10. Close the CB1 Rectifier Input Breaker.
11. Close the CB2 Bypass Input Breaker.
12. Verify that the Rectifier LED flashes green, then turns solid green after about 30 seconds.

100

Operating Instructions

13.
14.
15.
16.
17.
18.

11.7

Close the CB5 Output Breaker.
Close the external battery breaker(s).
Verify the Battery Alarm LED extinguishes.
Open theCB3 Maintenance Bypass Breaker.
On the Control Panel, press the INVERTER ON button for 2 seconds.
Verify that the Inverter LED turns solid green, and that the unit indicates Normal Mode after
about a minute.

Auto Restart
When the main and bypass sources fail, the UPS draws power from the battery system to supply the
load until the batteries are depleted. When the UPS reaches its end of discharge (EOD) threshold, it
will shut down.
The UPS will automatically restart and enable output power:
• after utility power is restored
• if “Auto Recovery after EOD Enabling” is enabled
• after the “Auto Recovery after EOD Delay Time” expires (the default delay is 10 minutes)
During the auto recovery delay, the Liebert® NX™ will be charging its batteries to provide a safety
margin for equipment shutdown if input power fails again.
If the “Auto Recovery after EOD Enabling” feature is disabled, the user must restart the system
manually.

11.8

Emergency Shutdown With EPO
This circuit has been designed to switch off the UPS in emergency conditions (i.e., fire, flood, etc.). The
system will turn off the rectifier and inverter and will stop powering the load immediately (including
the inverter and bypass), and the battery stops charging or discharging. If a Liebert NX battery
cabinet is connected, the circuit breaker in the battery cabinet will shunt trip open.
If input utility power is present, the UPS’s controls will remain active; however, the output will be
turned off. To remove all power from the UPS, open the external feeder breaker.

11.9

Reset After Shutdown for Emergency Stop (EPO Action) or Other Conditions
Once all appropriate measures have been taken to correct the problem indicated by the alarm
message appearing on the operator control panel display, carry out this procedure to restore the UPS
to regular operation following an EPO action or for the following reasons: Inverter Overtemperature,
Cut-off Overload, Battery Overvoltage, excessive switching (BYP: XFER COUNT BLOCK), etc.
When the user confirms that the fault is cleared:
1. Press the FAULT CLEAR button to let the system exit the emergency-off state.
NOTE
The rectifier will start again, and the bypass will begin to power the load. The Rectifier
indicator flashes while the rectifier is starting up. When the rectifier enters the normal
operation state (about 30 seconds), the rectifier indicator turns green.
2. Press the INVERTER ON button on the right side of the operator control panel for longer than
2 seconds.
NOTE
The rectifier will automatically turn on 5 minutes after the Inverter Overtemp alarm has
cleared.

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Operating Instructions

After the EPO button is pressed, if the input utility is removed, the UPS will shut down completely.
When input utility is returned, if the Bypass input circuit breaker (CB2) and UPS output circuit
breaker (CB5) are closed, the UPS will start up on Bypass. There will be power at the output
terminals of the UPS.

! WARNING
Risk of electrical shock. Can cause injury and death.
If the internal maintenance bypass circuit breaker (CB3) is closed and input utility is present,
there will be power at the output terminals of the UPS.

11.10 Battery Protection
11.10.1Battery Undervoltage Pre-Warning
Before the end of discharge, the Liebert® NX™ displays a Low Battery pre-warning. After this prewarning, the battery has the capacity for 5 minutes discharging with full load (default time). The
Liebert NX can be user-configured to display this warning from 3 to 60 minutes before end-ofdischarge.

11.10.2Battery End-of-Discharge (EOD) Protection
If the battery voltage is lower than the end-of-discharge voltage, the battery converter will be shut
down.

11.11 Multi-Module System Procedures
11.11.1Isolating One Module in a Multi-Module System
1. Turn Off the inverter.
2. Open External Output CB4 in Parallel Cabinet (see Figure 67).
The UPS enters Isolation Status automatically, parallel signaling and communication become
masked and output becomes inhibited.
3. Power Off the unit for maintenance.
4. Power On the unit.
5. Unit enters Test Mode by configuration software setting.
6. Diagnosis or testing.
7. The UPS exits Test Mode by configuration software setting.
Output becomes inhibited because of Isolation Status.
8. Return all switches to the Normal position.
9. Close External Output CB4 in Parallel Cabinet (see Figure 67).
The UPS exits Isolation Status automatically, parallel signaling and communication recovers,
output becomes enabled but interlocking works now.
10. Turn On inverter and join the parallel system.

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Operating Instructions

Figure 67 Typical parallel system block diagram with common input supply, with separate batteries and
optional output / bypass distribution panel

480V, 3W
System Input

MBB

Liebert NX UPS (40-200 kVA)

MIB

Bypass

LDB 1
Static
Switch

RIB 1

AC

DC
DC

IOB 1

User Supplied
Plug-In Output
Breakers

AC
DC

RIB = Rectifier Input
Breaker
IOB = Inverter Output
Breaker
MBB = Maintenance
Bypass Breaker
MIB = Maintenance
Isolation Breaker
LDB = Load Distribution
Breaker

LDB N

DC

480V DC
Battery Input

RIB 2

UPS Module 2

IOB 2

RIB 3

UPS Module 3

IOB 3

RIB 4

UPS Module 4

IOB 4

NOTE
All equipment servicing procedures must be carried out only by trained personnel.

103

480V, 3W
Output

480V, 3W
Output

Operating Instructions

11.11.2Inserting One Module into a Multi-Module System
This procedure outlines how to integrate a UPS module that has been previously isolated from other
modules of a group of paralleled UPS modules. It is assumed that the installation is complete, the
system has been commissioned by authorized personnel and the external power isolators are closed.

! WARNING

Risk of electrical shock. Can cause injury and death.
Utility power will be applied to UPS output terminals.
No operator serviceable parts are located behind covers that require a tool for their removal.
Only properly trained and qualified service personnel are authorized to remove such covers.

1. Open the UPS door to gain access to the main circuit breakers.
2. Open (or confirm disabled) maintenance bypass circuit breaker CB3.
3. Close Input breaker CB1.
The Rectifier indicator flashes on the UPS mimic panel during the startup of the rectifier and
becomes steady green once the rectifier reaches normal operation state after about 30 seconds.
4. Close external battery circuit breaker. This breaker is inside the battery cabinet or is otherwise
adjacent to the battery racks.
5. After the UPS detects the batteries, the red battery indicator extinguishes when the battery
charger starts operation.
6. Close bypass circuit breaker CB2.
7. Press the INVERTER ON control button for 2 seconds.
The inverter will start up and the inverter indicator flashes while it synchronizes to the load
voltage and frequency. After the inverter is ready, the UPS connects to the load, the inverter
indicator becomes steady green and the output indicator turns green.
8. Check that no “Warning” message is displayed in the top right corner of the LCD and that the
indicators have the status shown below.
# LED

LED Function

Status

1

Rectifier indicator

Green

2

Battery indicator

Off

3

Bypass indicator

Off

4

Inverter indicator

Green

5

Output indicator

Green

6

Alarm indicator

Off

The UPS is now operating in NORMAL mode.

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Operating Instructions

11.11.3Shutdown Procedure—Complete UPS and Load Shutdown
This procedure must be followed to completely power down the UPS and the load. All power switches,
isolators and circuit breakers will be opened and power will be removed from the load.
In multi-module systems, perform each step of the procedure in every UPS module before proceeding
to the next step.

NOTICE
Risk of improper operation. Can cause property damage from loss of power to connected load.
This procedure will shut off power to the load. Before beginning this procedure, shut down the
connected load to prevent the possibility of damage.
1. Press the EPO (Emergency Power Off) button at the UPS front panel only. This will disable
Rectifier, Inverter, Static Switch and Battery operation. The load will be de-energized.

! CAUTION
Except in an emergency situation, do not press any remote EPO button.
2. Open the UPS door to gain access to the main circuit breakers.
3. Open the Rectifier input circuit breaker CB1.
4. Open external battery circuit breaker. This breaker is inside the battery cabinet or is otherwise
adjacent to the battery racks.
5. Open Output circuit breaker CB5.
6. Open bypass input circuit breaker CB2.
7. Ensure maintenance bypass circuit breaker CB3 is open.
8. All mimic panel LED indications and messages will extinguish as the mains-driven, internal
power supplies decay.
9. To completely isolate the UPS from the AC supplies, the main external power input isolator (both
isolators, where dual supplies are provided for rectifier and bypass) and external output isolator
must be opened and tagged with warning labels accordingly.

11.12 Commissioning a Parallel System

! CAUTION
The operations described in this section must be performed by authorized electricians or

qualified technical personnel. If you have any difficulty, call 1-800-LIEBERT for assistance.

Check the input and output wiring of each UPS module. Ensure that the phase rotation sequence of
the main inputs and the bypass inputs and outputs of each UPS module are the same. Ensure that
the parallel cables are connected firmly.
It is assumed that the installation is complete, the system has been commissioned by authorized
personnel and the external power isolators are closed. Disconnect the load before startup.

11.13 Parallel System Startup
1. Start each UPS normally as described in 11.2 - UPS Startup.
2. Turn on the inverter of each UPS module one at a time.
3. Apply the load after the last UPS module transfers to inverter. The total load can be determined
through the LCD of either UPS.
4. Verify the load rate of each UPS module. If the load rates are roughly the same, then the parallel
system may be assumed to be operating normally.
NOTE
If one module cannot transfer to inverter mode long after its inverter is on, its output
connection may not be good or its output phase rotation may not be coincident with other
modules. At this time, the LCD for the UPS module will display “inverter asynchronous” and
the inverter indicator will flash continuously. If either UPS module makes abnormal noise
after it transfers to inverter, its parallel cables may be incorrectly connected.
105

Options

12.0 OPTIONS
Several items of optional equipment are available for connection to the Liebert® NX™ UPS.

12.1

Communication and Other User Terminals
The UPS can be integrated into advanced networking environments via UPS monitoring software
such as Microsoft UPS Monitor™, Liebert MultiLink™, Liebert Nform™, Liebert SiteNet™, Modbus /
Jbus, Liebert SiteScan™, Liebert SiteScan 2™, SNMP, etc. They allow UPS status monitoring and
automatic and safe shutdown of the server and PCs.

Figure 68 Monitoring board (U2) auxiliary terminal block detail
J8
J3

J1

LCD

J22

X7

J23

X6

J12
J9
J2
J15

PWR
MODEM
SNMP CARD

X5

J16
J17
Liebert IntelliSlot 2

J13 J21 J25

J28

J4

Liebert IntelliSlot 1

J26 J30 J10

X4

X4

J24

Liebert IntelliSlot 3

BFP INV ACF
X1

EPO
X2

Dry in

MBC

BCB

X3

NOTE: The black square ()
on each slot indicates Pin 1.

12.1.1 Analog Input Interface
At the X6 slot, there are two analog signal channels. Input range is from 0 to +5V, and the precision is
2 percent. “ENV-T” is used for environment temperature detecting.
•
•
•
•

X6 pin 1: Not used
X6 pin 2: +12V
X6 pin 3: ENV-T – environment temperature detection
X6 pin 4: GND

12.1.2 Power Output
The X5 slot can provide power for a modem or an external SNMP card. Available voltage is from 9V to
12V. The maximum current is 500mA.

12.1.3 Liebert IntelliSlot Communication
The Liebert NX has three Liebert IntelliSlot ports to allow field-installation of optional
communication cards. Liebert IntelliSlot cards communicate via Liebert’s proprietary ESP2 protocol
to cards that translate the information into such protocols as SNMP, IGMnet, Modbus or Jbus. Other
cards provide dry contact signals for external signaling of operating status.
The Liebert IntelliSlot communication ports may be installed or removed while the Liebert NX is
operating.

106

Options

12.1.4 Communication and Monitoring
Liebert IntelliSlot Web Card - SNMP/HTTP Network Interface Card
This network interface card provides all real-time data and status information as SNMPv1 traps for
connection to a 10/100-baseT Ethernet connection. The same card also will transmit the same status
information and all measured parameters for display through a Web browser.
Table 33

Liebert® NX™ communication options

Physical
description
of port

Top
Liebert
IntelliSlot

Middle
Liebert
IntelliSlot

Bottom
Liebert
IntelliSlot

Labeled
ID Name
of Port

Intellislot 2
(On Monitor
Board)

Intellislot 1
(On Monitor
Board)

Intellislot 3
(On Monitor
Board)

On the UPS
LCD screen,
under Settings,
controlled by:

Comm 1

Comm 2

Comm 3

Monitoring
Devices
supported

Baud
rate

Multiport 4

any

Relaycard-int

any

Comments

Liebert IntelliSlot
WEB-LB

2400

Not simultaneous with
Multilink in RS232-1;
See 12.1.5 - Configuring
Baud Rates

Modbus/Jbus

2400

See 12.1.5 - Configuring
Baud Rates

Multiport 4

any

Relaycard-int

any

Liebert IntelliSlot
WEB-LB

2400

See 12.1.5 - Configuring
Baud Rates
Not simultaneous with
Multilink in RS232-2

Modbus/Jbus

2400

See 12.1.5 - Configuring
Baud Rates

Multiport 4

any

Relaycard-int

any

Liebert IntelliSlot
WEB-LB

2400

See 12.1.5 - Configuring
Baud Rates

Modbus/Jbus

2400

See 12.1.5 - Configuring
Baud Rates

Top
DB9 port

RS232-1

Comm 1

MultiLink Serial

9600

Not simultaneous with Web
card in top Liebert
IntelliSlot.

Bottom
DB9 port

RS232-2

Comm 2

Service Software
(Reserved)

9600

Not simultaneous with Web
card in middle Liebert
IntelliSlot.

12.1.5 Configuring Baud Rates
The default baud rate for Liebert IntelliSlot cards is 9600. To communicate with the
Liebert OCWEB-LB, Modbus/Jbus or the adapters to permit using Liebert MultiLink, the baud rate
must be set to 2400.
To change the baud rate (refer to Table 33):
1. Use the Navigation keys directly below the LCD to highlight the Settings Screen.
2. Press F1 to move the highlight into the Data & Settings area of the LCD.
3. Use the Navigation keys to scroll down to highlight the current baud rate across from the
appropriate Comm Channel.
NOTE
The Comm Channel settings are not immediately visible because of window-size constraints.
Scroll down to view them on the screen.
4. Press the Enter (F4) key to select the Comm Channel to change.
5. Navigate to underline the desired baud rate (2400).
6. Press the Enter (F4) key to lock in the new baud rate.
107

Options

Figure 69 Liebert® IntelliSlot™ Web card display

Relay Card
The relay card provides voltage-free contact closures for remote monitoring of alarm conditions.
Delivering On Battery, On Bypass, Low Battery, Summary Alarm, UPS Fault and On UPS
signals, the easy-to-install card integrates with AS/400 computers (additional cable required) and
other relay contact monitoring systems.
The relay card is rated for 24 VAC/DC at 1A and supported in any of the three Liebert® IntelliSlot®
bays on the Liebert NX™.Refer to the Liebert Intellislot Relay Card user manual, SL-23211, for pin
and jumper configuration. The manual is available at Liebert’s Web site: www.liebert.com

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Options

MultiPort 4 Card
The MultiPort 4 card provides four sets of voltage-free contact closures for remote monitoring of
alarm conditions UPS operation On Battery and Low Battery condition. A typical application is to
allow a maximum of four computer systems to simultaneously monitor the status (e.g., utility power
failure-low battery) of a single UPS.
This card is supported in any of the three Liebert® IntelliSlot® bays on the Liebert NX™.
Figure 70 MultiPort 4 card pin assignment
CPU

Pin

CPU

UPS
CPU

Assignment
Description

1

Low Battery

2

Not Used

3

Not Used

4

Not Used

5

Not Used

6

Not Used

7

Low Battery Common

8

Utility Fail Common

9

Utility Fail

CPU

12.2

LBS Mode—Load Bus Synchronization
The function of LBS is to keep the output of two independent UPS systems (single unit or multiple
unit) in synchronization even when the two systems are operating in different modes (bypass/
inverter) or on batteries. It is usually used with a Static Transfer Switch connected to the critical load
to achieve dual bus configuration.
NOTE
In LBS configuration, both units must be supplied from the same utility source.

12.2.1 Remote Alarm Monitor
Status and alarm conditions are available on an optional remote alarm monitor (RAM) panel, which is
driven by volt-free alarm status contacts (from an optional relay alarm board).

12.3

Replacing Dust Filters
1. Open the UPS door.
2. The dust filters are behind the door. For each filter, there is a bracket on either side holding the
dust filter in place, as shown in Figure 71.
3. Remove one bracket and loosen the other. The second bracket need not be removed.
4. Remove the old filter and replace with the new filter.
5. Reinstall the bracket that was removed and tighten the other bracket.

Figure 71 Dust filter replacement

Bracket
Sems screw

Bracket

109

Specifications and Technical Data

13.0 SPECIFICATIONS AND TECHNICAL DATA
13.1

Lug Size and Torque Requirements
Use commercially available solderless lugs for the wire size required for your application. Refer to
Table 34. Connect wire to the lug using tools and procedures specified by the lug manufacturer.
Table 34

Torque specifications

Nut and Bolt CombinationS
Grade 2 Standard

Electrical Connections
with Belleville Washers

Bolt Shaft Size

Lb-in

N-m

Lb-in

N-m

1/4
5/16
3/8
1/2

53
107
192
428

6.0
12
22
22

46
60
95
256

5.2
6.8
11
29

Circuit Breakers With Compression Lugs (For Power Wiring)
Wire Size or Range
Lb-in
#6 - #4
#3 - #1
1/0 - 2/0
3/0 - 200 MCM
250 - 400 MCM
500 - 700 MCM

100
125
150
200
250
300

Circuit Breakers With Compression Lugs (For Power Wiring)
Current Rating
Lb-in
400 - 1200 Amps

300.00

Terminal Block Compression Lugs (For Control Wiring)
AWG Wire Size or Range
Lb-in
#22 -#14

3.5 to 5.3

N-m
11
14
17
23
28
34
N-m
34.00
N-m
0.4 to 0.6

NOTE: Use the values in this table unless the equipment is labeled with a different torque value.

Table 35

Battery torque rating

Battery

Initial Torque
in-lb (N-m)

UPS12-100MR

40 (4.5)

UPS12-150MR

25 (2.8)

UPS12-210MR

25 (2.8)

UPS12-300MR

110 (12.4)

UPS12-350MR

110 (12.4)

UPS12-400MR

110 (12.4)

UPS12-490MRLP

110 (12.4)

UPS12-540MR

110 (12.4)

HX300

60 (6.8)

HX330

60 (6.8)

HX400

60 (6.8)

HX500

60 (6.8)

HX540

60 (6.8)

110

Specifications and Technical Data

13.2

Cable Lengths: Floor to Connection Point Inside UPS
To help calculate the total cable length required, refer to Table 36 for the distance from the floor to
selected connection points inside the Liebert® NX™. Determine the cable length required to reach the
Liebert NX, then add the appropriate length from the table and adequate slack for repair and
maintenance.

Table 36

Distance to connection points on the Liebert NX UPS
Distance
From Floor
in. (mm)

From Top of Unit
in. (mm)

Bypass AC input supply

13 (330)

66 (1676)

UPS output AC

13 (330)

66 (1676)

Battery power

13 (330)

66 (1676)

Auxiliary cables: Monitor board (U2)

67 (1702)

11 (279)

Liebert IntelliSlot Communications

60 (1524)

19 (483)

Ground

13 (330)

66 (1676)

Parallel Board

70 (1780)

11 (279)

Connection Point on UPS

Table 37
System
Size

Parallel system current table

Type
E

1+1

E1
E2
E

2+1

E1
E2
E

3+1

E1
E2

kVA

System I/P
Voltage
(VAC)

System Max
Input Current

System
Input OCPCB
Size (A)

O/P Voltage
(VAC)

Nominal
O/P Current
Rating (A)

Output
OCPCB
Size (A)

80

480V

135.0

200

480V

96.2

125

120

480V

202.5

300

480V

144.3

200

80

480V

135.0

200

480V

96.2

125

120

480V

202.5

300

480V

144.3

200

80

N/A

N/A

N/A

480V

96.2

125

120

N/A

N/A

N/A

480V

144.3

200

80

480V

270.0

350

480V

192.5

250

120

480V

405.0

600

480V

288.7

400

80

480V

270.0

350

480V

192.5

250

120

480V

405.0

600

480V

288.7

400

80

N/A

N/A

N/A

480V

192.5

250

120

N/A

N/A

N/A

480V

288.7

400

80

480V

405.0

600

480V

288.7

400

120

480V

607.5

800

480V

433.0

600

80

480V

405.0

600

480V

288.7

400

120

480V

607.5

800

480V

433.0

600

80

N/A

N/A

N/A

480V

288.7

400

120

N/A

N/A

N/A

480V

433.0

600

Type E: BB0, FB0 and KB0 configurations
Type E1: CB1, GB1, LB1 configurations;
Type E2: CB2, CB3, CB4 configurations
Use wiring rated at 75°C or greater.

111

Specifications and Technical Data

Table 38

External cabinet dimensions, including side panels

Wide Parallel Cabinet
Unit

Width

Depth

Height

mm (inch)

1240 (48.8)

965 (38)

2000 (78.7)

Narrow Parallel Cabinet
Unit

Width

Depth

Height

mm (inch)

845 (33.2)

965 (38)

2000 (78.7)

33 in. Battery Cabinet

13.3

Unit

Width

Depth

Height

mm (inch)

845 (33.2)

965 (38)

2000 (78.7)

Cable size and tightening torques
Table 39

Cable size tightening torque at Liebert® NX™ 40kVA UPS terminals
Cable Size
(Copper Wire Only)

Torque to Tighten
Terminal Bus & Lug Body

Main Input
(Single Input)

4

10 N-m

Main Input
(Dual Input)

4

10 N-m

Bypass Input
(Dual Input)

4

10 N-m

Output

3

10 N-m

Bus Type

Table 40

Cable size tightening torque at Liebert NX 60kVA UPS terminals
Cable Size
(Copper Wire Only)

Torque to Tighten
Terminal Bus & Lug Body

Main Input
(Single Input)

1

10 N-m

Main Input
(Dual Input)

1

10 N-m

Bypass Input
(Dual Input)

2

10 N-m

Output

2

10 N-m

Bus Type

Table 41

Cable size tightening torque at Liebert NX 80kVA UPS terminals
Cable Size
(Copper Wire Only)

Torque to Tighten
Terminal Bus & Lug Body

Main Input
(Single Input)

2/0

10 N-m

Main Input
(Dual Input)

2/0

10 N-m

Bypass Input
(Dual Input)

1/0

10 N-m

Output

1/0

10 N-m

Bus Type

112

Specifications and Technical Data

Table 42

Cable size tightening torque at Liebert® NX™ 100kVA UPS terminals
Cable Size
(Copper Wire Only)

Torque to Tighten
Terminal Bus & Lug Body

Main Input
(Single Input)

4/0

10 N-m

Main Input
(Dual Input)

4/0

10 N-m

Bypass Input
(Dual Input)

2/0

10 N-m

Output

2/0

10 N-m

Bus Type

Table 43

Cable size tightening torque at Liebert NX 120kVA UPS terminals
Cable Size
(Copper Wire Only)

Torque to Tighten
Terminal Bus & Lug Body

Main Input
(Single Input)

250

10 N-m

Main Input
(Dual Input)

250

10 N-m

Bypass Input
(Dual Input)

4/0

10 N-m

Output

4/0

10 N-m

Bus Type

Table 44

Cable size tightening torque at Liebert NX 160kVA UPS terminals
Cable Size
(Copper Wire Only)

Torque to Tighten
Terminal Bus & Lug Body

Main Input
(Single Input)

2-3/0

26 N-m

Main Input
(Dual Input)

2-3/0

26 N-m

Bypass Input
(Dual Input)

2-3/0

26 N-m

Output

2-3/0

26 N-m

Bus Type

Table 45

Cable size tightening torque at Liebert NX 200kVA UPS terminals
Cable Size
(Copper Wire Only)

Torque to Tighten
Terminal Bus & Lug Body

Main Input
(Single Input)

2-4/0

26 N-m

Main Input
(Dual Input)

2-4/0

26 N-m

Bypass Input
(Dual Input)

2-4/0

26 N-m

Output

2-4/0

26 N-m

Bus Type

Table 46
Cabinet
Rating

Cable size tightening torque at Liebert NX 480V Battery Cabinet DC input bus terminals
Cable Size
(Copper Wire Only)

Torque to Tighten
Terminal Bus and Lug Body

225A

4/0AWG

15 N-m

350A

400kcmil

15 N-m

600A

2-350kcmil

26 N-m

All control wiring and power wiring must be 600V rated wire.

113

Specifications and Technical Data

13.4

Battery Run Times
Table 47

Enersys battery run times in minutes
Softscale Range
Scalable to 80kVA

External Battery Cabinet

Rated Output, kVA

Type

Quantity

40

60

HX205FR

1

19

HX300FR

1

31

HX330FR

1

HX400RF

1

HX500FR
HX205FR
HX300FR

Scalable to 120kVA

Scalable to 200kVA

Rated Output, kVA

Rated Output, kVA

80

80

100

120

160

200

11

7

N/A

N/A

N/A

N/A

N/A

17

12

12

8

6

N/A

N/A

36

22

15

15

11

8

5

N/A

40

26

18

18

13

10

6

N/A

1

64

38

27

27

20

16

10

7

2

41

27

19

N/A

N/A

N/A

N/A

N/A

2

70

41

32

32

22

18

12

9

HX330FR

2

90

52

37

37

28

23

16

11

HX400RF

2

98

62

41

41

34

27

19

14

HX500FR

2

146

93

66

66

49

38

28

21

HX205FR

3

70

41

33

N/A

N/A

N/A

N/A

N/A

HX300FR

3

109

71

50

51

38

32

21

16

HX330FR

3

146

92

63

63

47

38

27

20

HX400RF

3

156

100

72

72

54

41

32

23

HX500FR

3

224

148

105

106

80

67

46

35

HX205FR

4

97

63

45

N/A

N/A

N/A

N/A

N/A

HX300FR

4

153

99

71

72

54

41

33

23

HX330FR

4

202

131

93

94

69

53

38

30

HX400RF

4

216

142

101

102

77

64

41

35

HX500FR

4

317

206

149

150

113

95

68

50

114

Specifications and Technical Data

Table 48

C&D Dynasty battery run times in minutes
Softscale Range
Scalable to 80kVA

External Battery Cabinet
Type

Quantity

Scalable to 120kVA

Scalable to 200kVA
Rated Output, kVA

Rated Output, kVA

Rated Output, kVA

40

60

80

80

100

120

160

200

UPS12-100MR

1

5

N/A

N/A

N/A

N/A

N/A

N/A

N/A

UPS12-150MR

1

12

6

N/A

N/A

N/A

N/A

N/A

N/A

UPS12-210MR

1

19

10

6

N/A

N/A

N/A

N/A

N/A

UPS12-300MR

1

32

19

12

13

9

6

N/A

N/A

UPS12-350MR

1

38

23

16

16

11

8

N/A

N/A

UPS12-400MR

1

41

28

19

20

14

10

6

N/A

UPS12-490MR

1

65

38

27

27

20

15

8

N/A

UPS12-540MR

1

68

40

31

31

23

17

10

6

UPS12-100MR

2

16

8

5

N/A

N/A

N/A

N/A

N/A

UPS12-150MR

2

31

18

12

N/A

N/A

N/A

N/A

N/A

UPS12-210MR

2

47

30

20

N/A

N/A

N/A

N/A

N/A

UPS12-300MR

2

74

46

33

33

25

20

13

9

UPS12-350MR

2

82

54

38

39

31

25

16

11

UPS12-400MR

2

101

64

45

46

36

28

19

14

UPS12-490MR

2

149

95

67

68

50

39

27

20

UPS12-540MR

2

156

99

70

71

53

41

31

23

UPS12-100MR

3

28

16

10

N/A

N/A

N/A

N/A

N/A

UPS12-150MR

3

50

32

22

N/A

N/A

N/A

N/A

N/A

UPS12-210MR

3

77

48

35

N/A

N/A

N/A

N/A

N/A

UPS12-300MR

3

122

75

53

53

40

34

22

17

UPS12-350MR

3

147

83

65

65

49

39

28

21

UPS12-400MR

3

159

103

73

74

55

46

33

25

UPS12-490MR

3

244

151

107

108

81

68

46

35

UPS12-540MR

3

258

158

112

113

83

71

49

37

UPS12-100MR

4

41

25

17

N/A

N/A

N/A

N/A

N/A

UPS12-150MR

4

71

41

32

N/A

N/A

N/A

N/A

N/A

UPS12-210MR

4

109

70

49

N/A

N/A

N/A

N/A

N/A

UPS12-300MR

4

162

106

76

76

56

47

33

25

UPS12-350MR

4

209

132

90

91

70

55

39

31

UPS12-400MR

4

224

146

103

104

79

66

45

35

UPS12-490MR

4

335

212

152

153

121

97

67

50

UPS12-540MR

4

343

222

159

160

130

101

70

53

115

Specifications and Technical Data

116

UPS Status Messages

APPENDIX A - UPS STATUS MESSAGES
Table 49 shows all event messages as they appear in the current status area of the LCD and in the
history log, along with a description and recommended actions, if any. For further information on the
current status area and the history log, see 2.11 UPS Status Messages.
Table 49

UPS status messages

Event Message

Description / Suggested Action (if any)

Inverter Comm. Fail

The RS-485 communication between internal monitor and inverter has failed. Contact Liebert
Services at 800-543-2378 for assistance.

Rectifier Comm. Fail

The RS-485 communication between internal monitor and rectifier fails. Contact Liebert
Services at 800-543-2378 for assistance.

Parallel Comm. Fail

The CAN communication between different UPS units within a parallel system has failed.
Check if there are some UPS units not powered on in the parallel system. If so, power on these
UPS units and check if the alarm disappears.
Press Fault Clear push button.
If alarm does not clear, contact Liebert Services at 800-543-2378

Battery Overtemp.

The battery temperature is over limit. Check the battery temperature and ventilation

Replace Battery

Battery should be replaced. Contact Liebert Services at 800-543-2378 for assistance.

Battery Low Pre-warning

Before the end of discharging, battery under-voltage pre-warning should occur. After this prewarning, battery should have the capacity for 3 minutes discharging with full load. The time is
user configured from 3 to 60 minutes.
Shut down the load in time to prevent damage to equipment and data.

Battery End of Discharge

Inverter turned off due to low battery voltage.
Check the utility failure and try to recover it.

Mains Volt. Abnormal

Mains voltage exceeds the upper or lower limit and results in rectifier shutdown.
Check the input line-to-line voltage amplitude of rectifier.

Mains Undervoltage

Mains voltage is undervoltage 288V~384V line to line voltage with derated load.
Check the input line-to-line voltage amplitude of rectifier.

Mains Freq. Abnormal

Mains frequency is out of limit range and results in rectifier shutdown.
Check the rectifier’s input voltage frequency

Rectifier Fault

Contact Liebert Services at 800-543-2378 for assistance.

Input Inductor Overtemp.

The temperature of rectifier inductor of rectifier common mode inductor is too high to keep the
rectifier running.
Check the ambient temperature and ventilation; contact Liebert Services at 800-543-2378 for
assistance.

Rectifier Overtemp.

The temperature of the heat sink is too high to keep the rectifier running.
The UPS can recover automatically. Check the environment and ventilation.

Charger Fault

The charger has a fault. Contact Liebert Services at 800-543-2378 for assistance.

Control Power 1 Fail

Control Power 1 has failed or has been lost. Contact Liebert Services at 800-543-2378 for
assistance.

Mains Phase Reversed

Input phase sequence is inverse. Contact Liebert Services at 800-543-2378 for assistance.

Rectifier Overcurrent

The current of rectifier is over limit. Contact Liebert Services at 800-543-2378 for assistance.

Soft Start Fail

Rectifier could not start due to low DC bus voltage. Contact Liebert Services at 800-543-2378
for assistance.

Bypass Unable to Trace

This alarm is triggered by an inverter software routine when the amplitude or frequency of
bypass voltage is beyond the normal range.
The amplitude threshold is fixed for positive and negative 10% rating.
This alarm automatically resets once the bypass voltage goes normal.
First verify that the bypass voltage and frequency displayed on the panel is within the selected
range. Note here the rated voltage and frequency are specified by “Output voltage level” and
“Output frequency level” respectively.
If the displayed voltage is believed to be abnormal, then verify the bypass voltage and frequency
presented to the UPS. Check the external supply if it is found to be faulty.
Contact Liebert Services at 800-543-2378 for assistance.

117

UPS Status Messages

Table 49

UPS status messages

Event Message

Description / Suggested Action (if any)

Bypass Abnormal

This alarm is triggered by an inverter software routine when the amplitude or frequency of
bypass voltage exceeds the limit.
This alarm automatically resets once the bypass voltage goes normal.
First check whether there are relevant alarms such as “Bypass disconnect open,” “Bypass
phase reverse” and “Mains neutral lost.” If they appear, solve them first.
Then verify that the bypass voltage and frequency displayed on the panel is within the bypass
limit. Note here the rated voltage and frequency are specified by “Output voltage level” and
“Output frequency level” respectively.
If the displayed voltage is believed to be abnormal, then verify the bypass voltage and frequency
presented to the UPS. Check the external bypass supply if it is found to be faulty. If the utility is
likely to trigger this alarm frequently, the bypass limit can be increased through the configuration
software according to the customer’s agreement.
Contact Liebert Services at 800-543-2378 for assistance.

Inverter Asynchronous

This alarm is triggered by an inverter software routine when the inverter and bypass waveforms
are misaligned by more than 6 degrees in phase. This alarm resets automatically once the
condition clears.
First check if the alarm “Bypass unable to trace” or “Bypass abnormal” occurs. If so, solve it first.
Verify the waveform of the bypass voltage.
Contact Liebert Services at 800-543-2378 for assistance.

Inverter Fault

This alarm indicates a fault condition exists within the inverter.
Contact Liebert Services at 800-543-2378 for assistance.

Output Voltage Abnormal

This alarm indicates the inverter voltage waveform is abnormal.
Contact Liebert Services at 800-543-2378 for assistance.

Input Current Abnormal

This alarm indicates the rectifier input current is abnormal.
Contact Liebert Services at 800-543-2378 for assistance.

Inv. Inductor Overtemp.

The temperature of the inverter filter inductor or inverter common mode inductor is too high to
keep inverter running.
This alarm is triggered by the signal from a thermostat mounted in the inverter filter inductor.
The UPS would recover automatically after a 5 minute delay from the disappearance of the
overtemperature signal.
If the overtemperature condition is true then check for and verify:
High ambient air temperature.
Blocked cooling airway
Any fan failure
Prolonged inverter overload.
Contact Liebert Services at 800-543-2378 for assistance.

Inverter Overtemp.

The temperature of the inverter heat sink is too high to keep inverter running.
This alarm is triggered by the signal from a temperature monitoring thermostat on the inverter
bridge heat sink.
The UPS will recover automatically after a 5 minute delay from the disappearance of the
overtemperature signal.
If the overtemperature condition is true then check for and verify:
high ambient air temperature.
blocked cooling airway.
any fan failure.
prolonged inverter overload.
Contact Liebert Services at 800-543-2378 for assistance.

Fan Fault

At least one of the cooling fans has failed. Contact Liebert Services at 800-543-2378 for
assistance.

Inverter STS Fail

At least one of the static switches of inverter side is open or short circuit. This fault is locked until
power off. Contact Liebert Services for assistance at 800-543-2378 for assistance.

Bypass STS Fail

At least one of the static switches of bypass side is open or short-circuited. This fault is locked
until power off.
Contact Liebert Services at 800-543-2378 for assistance.

Output Fuse Fail

At least one of the output fuses is open. Contact Liebert Services at 800-543-2378 for
assistance.

Control Power 2 Fail

Control Power 2 is abnormal or lost. Contact Liebert Services at 800-543-2378 for assistance.

118

UPS Status Messages

Table 49

UPS status messages

Event Message

Description / Suggested Action (if any)

Unit Overload

The UPS is overloaded when the load arises above 105% nominal rating.
The alarm automatically resets once the overload condition is removed.
Confirm that the alarm is true by checking the load percent indicated on the LCD panel to
determine which phase is being overloaded.
If the alarm is true, measure the actual output current to verify that the indications are valid.
Disconnect unnecessary load. In a parallel system, a severe load sharing error can also lead to
the alarm.
Contact Liebert Services at 800-543-2378 for assistance.

System Overload

The UPS parallel system is overloaded when the total load arises above 105% nominal rating
for the set basic number of UPS units. The alarm resets automatically once the overload
condition is removed.
Confirm that the alarm is true by checking the system load percent indicated on the LCD panel
to determine which phase is being overloaded.
If the alarm is true, measure the actual output current to verify that the indications are valid.
Disconnect unnecessary load and ensure the safety. In a parallel system, a severe load sharing
error can also leads to the alarm.

Unit Overload Timeout

The UPS is overloaded and the overload times out.
Note 1: The highest loaded phase will indicate overload timing-out first.
Note 2: When the timer is active then alarm “unit overload” should also be active as the load is
above nominal.
Note 3: When the timer has expired, the inverter Static Switch is opened and the load
transferred to bypass. The inverter shutdown and will restart after 1 seconds.
Note 4: If the load decreases lower than 95% after 5 minutes, the system will transfer back to
inverter mode.
Confirm that the alarm is genuine by checking the load percent indicated on the LCD. If an
overload is indicated then check the load, and investigate any additional load connected prior to
the alarm (if applicable).

Inverter Overcurrent

The current of inverter IGBT is over limit. If the fault will not reset, contact Liebert Services at
800-543-2378 for assistance.

Bypass Phase Reversed

The phase sequence direction of bypass voltage is reversed.
Normally, the phase of Phase B lags 120 degrees behind Phase A, and the phase of Phase C
lags 120 degrees behind Phase B.
Verify that the phase rotation of the bypass supply presented to the UPS is correct, and rectify it
if it is found to be in error. Contact Liebert Services at 800-543-2378 for assistance.

Load Impact Transfer

A transfer to bypass occurred due to a large step load. The UPS should recover automatically.
Turn on connected equipment in sequential order to reduce the step loading of the inverter.

Transfer Timeout

The load is on bypass power due to excessive number of transfers that occurred within the last
hour.
The UPS will recover automatically and will transfer the load back to inverter power within an
hour.

Load Sharing Fault

UPS units working within a parallel system are not sharing load current correctly. Contact
Liebert Services at 800-543-2378 for assistance.

DC Bus Abnormal

Shut off inverter due to abnormal DC bus voltage.
Contact Liebert Services at 800-543-2378 for assistance.

System Transfer

The whole paralleled UPS system transferred to bypass at the same time. This message will
appear on the UPS which passive transfer to bypass.

Parallel Board Fault

Parallel board is not working correctly. Contact Liebert Services at 800-543-2378 for assistance.

DC Bus Overvoltage

Rectifier, inverter and battery converter were shut down because DC bus voltage is too high.
Check whether there is a fault in rectifier side. If not, check whether overload occurs.
Restart the inverter after resetting the fault. If fault does not clear, contact Liebert Services at
800-543-2378 for assistance.

Parallel Connect Fault

The parallel cables are not connected correctly in a parallel system.
Reset the fault by pressing the Fault Clear button, then restart the inverter by pressing the
Inverter On button.
If the UPS does not resume normal operation, contact Liebert Services at
800-543-2378 for assistance.

Bypass Overcurrent

Bypass current is over limit above 135% rating. The UPS just alarms and does nothing. Refer to
your installation documentation or contact Liebert Services at 800-543-2378 for assistance.

119

UPS Status Messages

Table 49

UPS status messages

Event Message

Description / Suggested Action (if any)

LBS Active

The LBS setting is active. The UPS is acting as an LBS master or slave in a dual bus
configuration.

Battery ground fault

Battery ground fault from dry contact signal. Contact Liebert Services at 800-543-2378 for
assistance.

Inverter turned On
manually

Manual Turn On via front panel

Inverter turned Off
manually

Manual Turn Off via front panel

EPO

Emergency Power Off

Transfer Confirm

Interrupted Transfer Confirm

Transfer Cancel

Interrupted Transfer is cancel

Unit Off Confirm

Unit Turned Off Confirm

System Off Confirm

Parallel System Turned Off Confirm

Fault Reset

Fault Reset

Alarm Silence

Alarm Silence

Turn On Fail

Turn On Fail

Alarm Reset

Audible Alarm Reset

Bypass Mode

UPS in Bypass Mode

Normal Mode

UPS in Normal Mode

Battery Mode

UPS in Battery Mode

Check UPS output

UPS Shutdown, output power-down

Output Disabled

UPS Output Disabled

Generator Connected

Generator is connected and a signal is sent to UPS

Input CB Open

Input CB is Open

Input CB Closed

Input CB is Closed

Bypass CB Open

Bypass CB is Open

Bypass CB Closed

Bypass CB is Closed

Output CB Open

Output CB is Open

Output CB Closed

Output CB is Closed

Maint. CB Open

Maintenance CB is Open

Maint. CB Closed

Maintenance CB is Closed

Battery Reverse

Connect the battery again and check the wiring of batteries

No Battery

Check the battery and the wiring of batteries

Auto start

After the UPS was shut down at end of discharge, inverter auto starts when utility is restored

BCB closed

BCB closed from dry contact signal

BCB open

BCB open from dry contact signal

Battery Float Charging

Battery is float charging

Battery Boost Charging

Battery is boost charging

Battery Mode

Battery is discharging

Battery Period Testing

Battery is period self-testing.

Batt. Capacity Testing

Battery is capacity self-testing.

Batt. Maint. Testing

Battery is maintenance self-testing.

UPS System Testing

UPS System is testing

Inverter in Setting

Inverter is in parameter setting

Rectifier in Setting

Rectifier is in parameter setting
120

UPS Status Messages

Table 49

UPS status messages

Event Message

Description / Suggested Action (if any)

Balancer Fault

Internal VDC (+) and VDC (-) offset by over 50V exceeding the inverter DC offset compensation
capacity. Inverter shuts down. Load transfers to bypass.

Operation Invalid

This record is registered following an incorrect operation.

Byp. Abnormal Shutdown

Both bypass and inverter voltages unavailable. Load interruption

Setting Save Error

History records not saved (Reserved)

Protocol version clash

Firmware incompatibility between monitor board and digital signal processor board

MBP-T cabinet Fan Fault

Maintenance bypass cabinet fans fault

Ext Input TX Overtemp

External input isolation transformer overtemperature

Ext Output TX Overtemp

External output isolation transformer overtemperature

Battery Room Alarm

Environment in Battery Room Needs Attention

Rec Flash Update

Rectifier firmware is being updated

Inv Flash Update

Inverter firmware is being updated

Monitor Flash Update

Monitor firmware is being updated

Input contactor fault

Input contactor fault

LBS abnormal

LBS is abnormal

DSP firmware error

The inverter firmware is not compatible with the rectifier firmware.

Fan power fail

Fan power has failed

Keyboard fault

Keyboard has a fault. Check the cable between keyboard with U2 board. Contact Liebert
Services at 800-543-2378 for assistance.

KVA Invalid

An invalid kVA has been configured in unit.Contact Liebert Services at 800-543-2378 for
assistance.

KVA updated

The capacity updating is successful.

Output ground fault

Output Line is shorted with ground

121

Ensuring The High Availability
Of Mission-Critical Data And Applications.

Emerson Network Power, a business of Emerson (NYSE:EMR),
is the global leader in enabling Business-Critical Continuity™
from grid to chip for telecommunication networks, data centers,
health care and industrial facilities. Emerson Network Power
provides innovative solutions and expertise in areas including
AC and DC power and precision cooling systems, embedded
computing and power, integrated racks and enclosures,
power switching and controls, infrastructure management,
and connectivity. All solutions are supported globally by local
Emerson Network Power service technicians. Liebert AC power,
precision cooling and monitoring products and services
from Emerson Network Power deliver Efficiency Without
Compromise™ by helping customers optimize their data center
infrastructure to reduce costs and deliver high availability.

Technical Support / Service
Web Site
www.liebert.com
Monitoring
liebert.monitoring@emerson.com
800-222-5877
Outside North America: +00800 1155 4499
Single-Phase UPS & Server Cabinets
liebert.upstech@emerson.com
800-222-5877
Outside North America: +00800 1155 4499
Three-Phase UPS & Power Systems
800-543-2378
Outside North America: 614-841-6598
Environmental Systems
800-543-2778
Outside the United States: 614-888-0246

Locations
United States
1050 Dearborn Drive
P.O. Box 29186
Columbus, OH 43229
Europe
Via Leonardo Da Vinci 8
Zona Industriale Tognana
35028 Piove Di Sacco (PD) Italy
+39 049 9719 111
Fax: +39 049 5841 257
Asia
29/F, The Orient Square Building
F. Ortigas Jr. Road, Ortigas Center
Pasig City 1605
Philippines
+63 2 687 6615
Fax: +63 2 730 9572

While every precaution has been taken to ensure the accuracy
and completeness of this literature, Liebert Corporation assumes no
responsibility and disclaims all liability for damages resulting from use of
this information or for any errors or omissions.
© 2010 Liebert Corporation
All rights reserved throughout the world. Specifications subject to change
without notice.
® Liebert is a registered trademark of Liebert Corporation.
All names referred to are trademarks
or registered trademarks of their respective owners.

SL-25217_REV4_10-12

Rev. Date: 08-09

Emerson Network Power.
The global leader in enabling Business-Critical Continuity™
AC Power
Connectivity

Embedded Computing
Embedded Power

DC Power

Infrastructure Management & Monitoring

Outside Plant
Power Switching & Controls
Precision Cooling

EmersonNetworkPower.com
Racks & Integrated Cabinets
Services
Surge Protection

Emerson, Business-Critical Continuity, Emerson Network Power and the Emerson Network Power logo are trademarks of Emerson Electric Co. or one of its affiliated companies.
©2010 Emerson Electric Co.



---

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