Liebert Emerson Nx Ups System Users Manual

NX UPS System to the manual 8fd40408-e337-466a-ad67-390c4cd64ffc

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AC Power
For Business-Critical Continuity

Liebert NX UPS
User Manual–10-30kVA, 400V, 50/60Hz

TABLE OF CONTENTS
1.0

SINGLE MODULE UPS INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3

1.1

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

1.2

Preliminary Checks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

1.3

Location. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.3.1
1.3.2
1.3.3

1.4

Positioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.4.1
1.4.2
1.4.3
1.4.4
1.4.5
1.4.6
1.4.7
1.4.8

1.5

Rectifier and Bypass Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
External Battery. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
UPS Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Cable Termination . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Control Cables and Communication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
1.7.1

1.8

5
5
5
6
6
6
6
6

Power Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
1.6.1

1.7

System Cabinets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
10 to 30kVA UPS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Moving the Cabinets. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Clearances. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Access . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Final Positioning. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Floor Anchoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cable Entry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

External Protective Devices. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.5.1
1.5.2
1.5.3

1.6

UPS Room . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
External Battery Room . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Monitor Board Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Dry Contacts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
1.8.1
1.8.2
1.8.3
1.8.4
1.8.5
1.8.6
1.8.7

Input Dry Contacts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maintenance Bypass Cabinet Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
External Circuit-Breaker Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output Dry Contacts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Emergency Power Off Input. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
External Bypass Switch Interlock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Battery Start Facility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

12
12
13
14
15
16
16

2.0

BATTERY INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

2.1

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

2.2

Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

2.3

Battery Cabinet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
2.3.1
2.3.2
2.3.3
2.3.4
2.3.5
2.3.6
2.3.7
2.3.8
2.3.9

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Temperature Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Circuit Isolator Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Battery Temperature Sensor (Optional) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Moving the Battery Cabinets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cable Entry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
General Arrangement Drawings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

i

19
19
19
19
19
20
20
20
21

2.4

Battery Power Cables. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
2.4.1
2.4.2
2.4.3
2.4.4

Connection Principles. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fitting the Batteries. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Connecting the Battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Battery Room Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

24
25
25
25

2.5

Battery Control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

3.0

UPS MULTI-MODULE INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

3.1

General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

3.2

Paralleled UPS Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
3.2.1
3.2.2
3.2.3
3.2.4

3.3

27
28
28
29

Hot-Standby UPS Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
3.3.1
3.3.2
3.3.3

3.4

Cabinet Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
External Protective Devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Cables. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Control Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Cabinet Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
External Protective Devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Power Cables. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Dual Bus System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
3.4.1
3.4.2
3.4.3
3.4.4
3.4.5

Cabinet Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
External Protective Devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Cables. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Control Wires . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Extended Dual Bus Synchronization Option (DBS Interface Box) . . . . . . . . . . . . . . . . . . . . .

31
31
31
32
32

4.0

INSTALLATION DRAWINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33

5.0

OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39

5.1

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
5.1.1
5.1.2
5.1.3
5.1.4
5.1.5

5.2

Features of NX Multi-Module UPS Configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Requirements for Paralleling of UPS Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

Modes of Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
5.3.1
5.3.2
5.3.3
5.3.4
5.3.5
5.3.6
5.3.7
5.3.8
5.3.9

5.4

39
40
40
41
41

Multi Module UPS—1+N . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
5.2.1
5.2.2

5.3

Split-Bypass Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Static Transfer Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Battery Temperature Compensation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Redundant Control Power Supply Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Socket Outlet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Normal Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Battery Mode (Stored Energy Mode) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Auto-Restart Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Bypass Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maintenance Mode (Manual Bypass) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ECO Mode (Single UPS Only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Parallel Redundancy Mode (System Expansion) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Hot-Standby Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Frequency Converter Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

42
42
42
43
43
43
43
43
43

Battery Management—Set During Commissioning. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
5.4.1
5.4.2

Normal Function. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Advanced Functions (Software Settings Performed by the Commissioning Engineer) . . . . . 44
ii

5.5

Battery Protection (settings by commissioning engineer) . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

6.0

OPERATING PROCEDURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

6.1

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
6.1.1

6.2

Power Switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

UPS Startup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
6.2.1
6.2.2

Start-Up Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Verify Switching Between Operation Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

6.3

Switching the UPS from Normal to Maintenance Bypass . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

6.4

Powering Down the UPS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

6.5

Powering Down the UPS and Maintaining Power to Load . . . . . . . . . . . . . . . . . . . . . . . . . . 49

6.6

Emergency Shutdown With EPO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

6.7

Auto Restart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

6.8

Reset After Shutdown for Emergency Stop (EPO Action) or Other Conditions . . . . . . . . . . 50

6.9

Language Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

6.10

Changing the Current Date and Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

6.11

Command Password . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

6.12

Isolating One Module in a Multi-Module System. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

6.13

Inserting One Module into a Multi-Module System. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

7.0

OPERATOR CONTROL PANEL AND DISPLAY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54

7.1

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
7.1.1
7.1.2
7.1.3
7.1.4
7.1.5

Mimic Power Flow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Audible Alarm (Buzzer) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Direct Access Push Buttons (Keys) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
LCD Monitor and Menu keys. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Detailed Description of Menu Items . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

55
55
56
56
58

7.2

All Status and Event Messages Displayed on the UPS Front Panel. . . . . . . . . . . . . . . . . . . 60

7.3

Prompt (Pop-Up) Windows. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64

7.4

Dynamic Energy Flow Chart and UPS Help Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64

7.5

Default Screen Saver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65

8.0

OPTIONS—FOR ASSEMBLY INSIDE THE UPS CABINET . . . . . . . . . . . . . . . . . . . . . . . . . . . 66

8.1

Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
8.1.1
8.1.2
8.1.3
8.1.4
8.1.5

8.2

Battery Ground Fault Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Redundant Fan for Power Module. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
OC Web Card - SNMP/HTTP Network Interface Card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Relay Card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Multiport-4 Card. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

66
67
68
69
69

OC485 Web Card – Modbus, Jbus, IGM Net . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
8.2.1
8.2.2

Remote Alarm Monitor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
Dust Filter for 10-30kVA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72

9.0

TECHNICAL SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73

9.1

Conformity and Standards. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73

iii

FIGURES
Figure i
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
Figure 19
Figure 20
Figure 21
Figure 22
Figure 23
Figure 24
Figure 25
Figure 26
Figure 27
Figure 28
Figure 29
Figure 30
Figure 31
Figure 32
Figure 33
Figure 34
Figure 35
Figure 36
Figure 37
Figure 38
Figure 39
Figure 40
Figure 41
Figure 42
Figure 43

Model number nomenclature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vi
Residual current circuit breakers (RCCB) symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Auxiliary terminal block detail monitoring board (U2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Input dry contacts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Jumper connection for BCB interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Output dry contacts and EPO wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Battery start for UPS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Single temperature sensor and monitor board-U2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Battery cabinet bottom cable entry location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Battery cabinet with fuse or optional circuit breaker locations . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Battery cabinet internal layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Battery cabinet, bottom entry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Battery room design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Emergency power off connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Typical 1+N system block diagram with common input supply, with separate batteries
and optional output / bypass distribution panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Dry contacts, multiple UPS modules with distribution panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Connection of 1+N system parallel control cables. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Hot standby configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Typical dual bus system configuration with static transfer switch and Load Bus Synch . . . . . . 31
Connections of a typical dual bus system utilising Load Bus Synch . . . . . . . . . . . . . . . . . . . . . . . 32
Electrical connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
General arrangement—10-30kVA UPS module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
10-30kVA NX front view with doors open . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Location of parallel logic board M3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Internal battery layout and connecting—GP12120 F2 (12AH/12V) . . . . . . . . . . . . . . . . . . . . . . . 37
Internal battery layout and connecting—LC-R127R2PG1 (7.2AH/12V) . . . . . . . . . . . . . . . . . . . . 37
Internal battery layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Single unit block diagram with split-bypass input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Multiple battery temperature sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
1+N multi-module UPS with external maintenance bypass switch . . . . . . . . . . . . . . . . . . . . . . . 41
Example of configuration for single UPS with external maintenance bypass cabinet. . . . . . . . . 49
UPS control and display panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
Graphic LCD monitor windows and keypad . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
Menu tree . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
Help screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
Default screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
Battery ground fault detection set connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
Redundant power module fan set. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
Communication bays and cable location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
OC Web Card data summary window . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
OC Web Card battery data summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
SiteNet MultiPort4 Intellislot pin configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
OC485 Web card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
Dust filter replacement. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72

iv

TABLES
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

Maximum steady state AC and DC currents. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Distance from floor to connection point on the equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Input dry contacts at X3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Maintenance bypass cabinet interface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
External circuit-breaker interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Output dry contact relays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
EPO input contact relays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Dimensions and weight. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
UPS operating modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Rotary switch configurations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
UPS control and display panel components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
Rectifier indicator—1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Battery indicator—2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Bypass indicator—3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Inverter indicator—4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Load indicator—5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Status (Alarm) indicator—6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Audible alarm key . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Menu key Icons and their meaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
UPS system window . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
Descriptions of UPS menus and data window items . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
UPS messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
Prompt windows, meanings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
Dry contact fault alarm signal is available for remote monitoring . . . . . . . . . . . . . . . . . . . . . . . . 66
Relay Card pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
Relay card jumpers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
SiteNet MultiPort4 Intellislot pin assignment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
NX communication options. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
Compliance with European, international standards. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
Environmental characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
Overall efficiency, heat losses and air exchange . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
Mechanical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
Rectifier AC input (mains) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
Battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
Inverter output to critical load . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
Bypass mains input. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76

v

Figure i

Model number nomenclature

NXe

0

A0

010

U

Feature Set for Region

Input &
Output
Voltage

A0 - EMEA
B0 - Aust/NZ

50/60Hz
Voltage

Output kVA

C0 - Japan
Revision
to Base
Unit

D0 - China

010

E0 - Latin Amer

015

F0 - Other

020

Code

220/380

F

230/400

U

240/415

G

NX Product Line

UPS Single Module
Liebert NXe UPS module ratings:
10, 15, 20, 30kVA (with internal battery)
Example: NXE0A0010U =

10kVA module for Europe and Middle East, 400V/230V
output
Options
Battery cabinet

Model
Identification
NXE0NBCS

Battery Ground Fault detection kit

NXA0UFXBGF

Battery temperature probe (for external battery)

NXA0UFXBTS

Maintenance bypass cabinet (separate bypass input)

NXE0NMBX

Fan Redundancy kit

NXE0UFXRF

Seismic Anchor kit

NXA0UFXSAN

Dual bus control cable 05-10-15 metres

NXA0UFXD

Parallel control cable kit 05-10-15 metres

NXA0UFXP

Relay Card (On Bat, Bat Low, On Byp, Sum, UPS Fail)
MultiPort4 (4 sets On Bat, bat Low)
Web browser/TCPIP/SNMP Card
Jbus/Modbus Card

RELAYCARD-INT
MULTIPORT 4
OCWEB-LB
OC485CARD

RAM - Remote Alarm Monitor

NXA0CFXRAM

Modem card

NXA0CFXMOD

Extended LBS box

NXA0UFXLBS

Air Filter

NXA0UFXARF

Dual Bus Extension Kit 50-150 Meters

Individual Battery Monitoring

Note

NXXXXMLBSKIT

BDS 40 or
BDS 256

vi

Specify total system kVA
Specify UPS kVA rating
Specify length in metres
These are Intellislot plug-in cards (3 slots
available).
Requires RELAYCARD-INT

One filter
(XXX: 050 or 150) - Specify length in
meters. Used for extension in length or
dual bus arrangement between Nx and
non-Nx sources'
Specify number of blocks. Consult
Emerson Network Power representatives
for complete configuration

SAFETY PRECAUTIONS
This manual contains information concerning the installation and operation of this Emerson Network
Power Liebert NX™ Uninterruptible Power System (UPS).
This manual should be read before commencing installation.
The UPS must be commissioned and serviced by an engineer approved by the manufacturer (or
agent).
Failure to do so could result in personnel safety risk, equipment malfunction and invalidation of warranty.
The Liebert NX has been designed for Commercial/Industrial use only, and is not recommended for
use in life support applications.
This is a low emission CLASS A Uninterruptible Power System (UPS) product. In a residential environment, this product may nevertheless cause radio interference, in which case, the user may be
required to take additional measures.

Conformity and Standards
This equipment complies with CE directives 73/23 & 93/68 (LV Safety) and 89/336 (EMC), with Australia and New Zealand EMC Framework (C-Tick) and with the following product standards for Uninterruptible Power System (UPS).
• EN / IEC / AS 62040-1-1—General and safety requirements for use in operator access area
• EN / IEC / AS 62040-2—EMC requirements; Class A compliant
• EN / IEC / AS 62040-3—Performance requirements and test methods
For more details, see 9.0 - Technical Specifications
Continued compliance requires installation in accordance with these instructions and the use of manufacturer approved accessories only.

!

WARNING

High Leakage Current
EARTH CONNECTION IS ESSENTIAL BEFORE CONNECTING THE INPUT SUPPLY.
Earth leakage current exceeds 3.5 mA and is less than 860 mA.
Transient and steady-state earth leakage currents, which may occur when starting the
equipment, should be taken into account when selecting instantaneous RCCB or RCD devices.
Residual Current Circuit Breakers (RCCBs) must be selected sensitive to DC unidirectional
pulses (class A) and insensitive to transient current pulses.
Note also that the earth leakage currents of the load will be carried by this RCCB or RCD.
This equipment must be earthed in accordance with the local electrical code of practice.

!

WARNING

Back-Feed Protection Notice

This UPS is fitted with a voltage-free contact closure signal for use with an external
automatic disconnect device (supplied by others) to protect against back-feeding voltage into
the bypass input. If this signal is not used by the installer, a label must be added at the
external bypass input disconnect device to warn service personnel that the circuit is
connected to a UPS.
The text to use is the following or equivalent:
ISOLATE THE UNINTERRUPTIBLE POWER SYSTEM BEFORE WORKING ON THIS
CIRCUIT.

1

User-Serviceable Parts
All equipment maintenance and servicing procedures involving internal access requires the use of a
tool and should be carried out only by trained personnel. There are no user-serviceable parts behind
covers requiring a tool for removal.
This UPS is fully compliant with safety regulations for equipment located in an operator accessible
area. Hazardous voltage is present within the UPS and battery enclosure but out of reach of non-service personnel. Contact with hazardous voltage is minimized by housing live parts behind safety panels that require a tool for their removal. No risk exists to any personnel when operating the
equipment in the normal manner, following the recommended operating procedures.

Battery Voltage Exceeds 400VDC
All physical battery maintenance and servicing requires the use of a tool or a key and should be carried out only by trained personnel.

!

WARNING

Special care should be taken when working with the batteries associated with this equipment.
When connected together, the battery terminal voltage will exceed 400VDC and is potentially
lethal.

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.
Attention should be paid to the recommendations concerning local environmental conditions and the
provision of protective clothing, first aid and fire-fighting facilities.

2

Single Module UPS Installation

1.0

SINGLE MODULE UPS INSTALLATION

1.1

Introduction
This following section describes the requirements that must be taken into account when planning the
positioning and cabling of the Liebert NX uninterruptible power supply and related equipment.
This chapter is a guide as to general procedures and practices that should be observed by the installing engineer. The particular conditions of each site will determine the applicability of such procedures.

!

WARNING

Professional Installation Required
Do not apply electrical power to the UPS equipment before being authorised to do so by the
commissioning engineer.
The UPS equipment shall be installed by a qualified electrical tradesperson in accordance
with the information contained in this manual. All equipment not referred to this manual is
shipped with details of its own mechanical and electrical installation.
NOTE
Three-phase, 4-wire input supply required.
The standard Liebert NX UPS is suitable for connection to 3-phase, 4-wire (+ Earth) TN, TT
and IT AC power distribution systems (IEC60364-3). Optional 3-wire to 4-wire conversion
transformers are available. If it is used in IT AC power distribution systems, a 4-pole circuit
breaker must be used on the input and refer to the relative IT Systems’ standard

!

WARNING
Battery Hazards

Special care should be taken when working with the batteries associated with this equipment.
When connected together, the battery terminal voltage will exceed 400VDC and is hazardous.
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 the skin, the affected area should be washed
immediately with water.

1.2

Preliminary Checks
Before installing the UPS, please carry out the following preliminary checks:
1. Visually examine the UPS and battery equipment for transit damage, both internally and
externally. Report any damage to the shipper immediately.
2. Verify that the correct equipment is being installed. The equipment supplied has an identification
tag on the back of the main door reporting: the type, size and main calibration parameters of the
UPS.

3

Single Module UPS Installation

1.3

Location

1.3.1

UPS Room
The UPS and its internal battery is intended for indoor installation and should be located in an environment with clean air and with adequate ventilation to keep the ambient temperature within the
specified operating range (see Table 30).
All models in the Liebert NX UPS range are air-cooled with the aid of internal fans. Cold air enters
through ventilation grilles at the front of the cabinet and hot air is released through the grilles at the
back. Do not cover the ventilation openings.
If necessary to avoid room temperature build-up, install a system of room extractor fans. Optional air
filters are available if the UPS is to operate in a dusty environment.
The UPS heat dissipation detailed in Table 31 can be used as a guide for air conditioning sizing,
depending on the selected mode of operation:
• Normal Mode (VFI SS 111 Double Conversion UPS)
• ECO Mode (VFD SS 311 Stand By UPS)
If in doubt use Normal Mode figures.
NOTE
The UPS is suitable for mounting on concrete or other non-combustible surface only.

1.3.2

External Battery Room
Batteries should be mounted in an environment where the temperature is consistent and even over
the whole battery. Temperature is a major factor in determining the battery life and capacity. Typical
battery manufacturer performance data are quoted for an operating temperature between 20 and
25°C (68 and 77°F). Operating above this range will reduce the battery life while operation below this
range will reduce the battery capacity. In a normal installation the battery temperature is maintained between 15°C and 25°C (59 and 77°F). Keep batteries away from main heat sources or main air
inlets etc.
Where the batteries are located externally to the main UPS cabinet, a battery protection device
(e.g., fuses or circuit breakers) must be mounted as close as possible to the batteries themselves, and
connected using the most direct route possible.

1.3.3

Storage
Should the equipment not be installed immediately, it must be stored in a room for protection against
excessive humidity and or heat sources (see Table 30).

!

CAUTION

An unused battery must be recharged periodically per battery manufacturer
recommendation. Temporarily connecting the UPS to a suitable AC supply mains and
activating it for the time required for recharging the batteries can achieve this.

4

Single Module UPS Installation

1.4

Positioning
The cabinet is mounted on four castor-wheels for ease of positioning and for short distance movement.
Jacking feet are provided to prevent the UPS from moving once it has been wheeled to its final position.
For optimal design life, the place chosen must offer:
•
•
•
•
•
•
•
•

Easy connection
Enough space to easily work on the UPS
Sufficient air exchange of enough to dispel heat produced by UPS
Protection against atmospheric agents
Protection against excessive humidity and very high heat sources
Protection against dust
Compliance with the current fire prevention requirements
Operating environment temperature between 20°C and 25°C (68 and 77°F). The batteries are at
maximum efficiency in this temperature range (see Table 30).

The UPS cabinet is constructed around a steel chassis with removable panels. The top and side panels
are secured to the chassis by screws.
Access to the power terminals, auxiliary terminals blocks and power switches is from the front. Operational status and alarm information is provided through the front door operator control panel. Models 30kVA and below house both the power components and an internal battery. Cooling air enters
the front of the NX and is exhausted out the rear.

1.4.1

System Cabinets
A UPS may comprise a number of cabinets, depending on the design requirements (e.g., UPS cabinet,
external battery cabinet, external bypass cabinet). In general, all the Liebert cabinets used in a particular installation are of the same height and designed to be positioned side-by-side to form a matching
array.
Refer to 4.0 - Installation Drawings for assistance on positioning the cabinets described below.

1.4.2

10 to 30kVA UPS
The UPS consist of a single cabinet, which uses typically forty (40) 12V battery blocks, fitted internally and connected in series to provide a nominal battery voltage. The UPS may be shipped without
the batteries fitted.
An extended battery option is available. This comprises a separate cabinet containing additional batteries that can be connected to the UPS to increase its battery run time.

1.4.3

Moving the Cabinets

!

WARNING

Ensure that any equipment used to move the UPS cabinet has sufficient lifting capacity.
The UPS is fitted with casters. Take care to prevent the NX from moving when unbolting the
unit from its shipping pallet. Ensure that adequate personnel and lifting aids are available
when removing the shipping pallet.

Ensure that the UPS weight is within the designated surface weight loading of any handling equipment. See Table 32.
UPS and optional cabinets (battery cabinets, top cable entry cabinets, etc.) can be handled by means
of a forklift or similar equipment.
The UPS cabinet also can be moved short distances by its casters.
NOTE
Care must be taken when maneuvering units fitted with batteries. Keep such moves to a
minimum.
5

Single Module UPS Installation

1.4.4

Clearances
The Liebert NX has no ventilation grilles at either side of the UPS. To enable routine tightening of
power terminations within the UPS, in addition to meeting any local regulations, Liebert recommends providing adequate clearance in the front of the equipment for unimpeded passage of personnel with the doors fully opened. It is important to leave of 150mm (5.9") clearance behind the UPS to
permit adequate circulation of air coming out of the unit.

1.4.5

Access
The component layout of the UPS supports front and top access while servicing, diagnosing and
repairing the UPS, thus reducing the space requirement for side and rear access.

1.4.6

Final Positioning
The UPS cabinets are fitted with casters on the base to allow ease of movement and positioning.

!

WARNING

Casters are strong enough for movement across even surfaces only. Caster failure could occur
if they are subjected to shock loading.

When the equipment has been finally positioned, ensure the adjustable feet are set so that the UPS
will remain stationary and stable.

1.4.7

Floor Anchoring
Diagrams in 4.0 - Installation Drawings show the location of the holes in the base plate through
which the equipment may be bolted to the floor. If the equipment is to be installed on a raised floor it
should be mounted on a pedestal suitably designed to accept the equipment point loading. Refer to the
base view Figure 21 to design this pedestal.

1.4.8

Cable Entry
Cables can enter the Liebert NX UPS and battery cabinet from below. Cable entry is made possible by
removing a blanking piece fitted at the bottom of equipment to reveal the cable entry hole.

1.5

External Protective Devices
Circuit breakers or other protective devices must be installed in the AC supply, external to the UPS.
This chapter provides guidelines for qualified installers who must have knowledge of local wiring
practices pertaining to the equipment to be installed.

1.5.1

Rectifier and Bypass Input
Overcurrent protection must be installed at the distribution panel of the incoming main supply. The
protection must discriminate with the power cables current capacity and with the overload capacity of
the system (see Table 35). As a guideline, a thermomagnetic circuit breaker, with an IEC 60947-2
trip curve C (normal) for 125% of the current listed in Table 1 is suitable.
Split-Bypass—If a split-bypass is used, install separate protective devices for the rectifier and for
the bypass in the incoming mains distribution panel.
NOTE
Rectifier and bypass input sources must be referenced to the same neutral potential.

NOTE
For IT power systems, four-pole protective devices must be used, external to the UPS, both
upstream of the input distribution panel and downstream (toward the load).

6

Single Module UPS Installation

Earth Leakage (RCD):
Any residual current detector (RCD) installed upstream of the UPS input supply must be:
• sensitive to DC unidirectional pulses (Class A)
• insensitive to transient current pulses, and
• must have an average sensitivity, adjustable between 0.3 and 1A.
Figure 1

Residual current circuit breakers (RCCB) symbols

To avoid false alarms, earth leakage monitoring devices when used in systems with split-bypass input
or when used in paralleled UPS configurations, must be located upstream of the common neutral
sinking point. Alternatively, the device must monitor the combined four-wire rectifier and splitbypass input currents.
The residual earth current introduced by the RFI suppression filter inside the UPS is greater than
3.5mA and less than 860mA. Liebert recommends verifying the selectivity with all other differential
devices both upstream of the input distribution board and downstream (toward the load).

1.5.2

External Battery
The UPS and its associated batteries are protected against overcurrents through a DC compatible disconnect device.

1.5.3

UPS Output
Any external distribution board used for load distribution shall be fitted with protective devices that
discriminate with those used at the bypass input to the UPS and with the UPS overload characteristics (see Table 35).

7

Single Module UPS Installation

1.6

Power Cables
The cable design must comply with the voltages and currents provided in this section, follow local wiring practices and take into consideration the environmental conditions (temperature and physical
support media).
For cable entry terminal, refer to Figure 22.

!

WARNING

Before starting the UPS, ensure that you are aware of the location and operation of the
external isolators that connect the ups input/bypass supply to the mains distribution panel.
Check that these supplies are electrically isolated and post any necessary warning signs to
prevent their inadvertent operation.

!
Table 1

WARNING

Failure to follow adequate earthing procedures may result in electromagnetic interference or
in hazards involving electric shock and fire.
Maximum steady state AC and DC currents
Nominal Current, Amps
Input Mains Current
With Full Battery
Recharge
3ph + N

Busbar Stud Size

1,2

Output Current2
at Full Load
3ph + N

Input/Output/
Bypass
Cables

UPS
Rating
(kVA)

380V

400V

415V

380V

400V

415V

Battery at
End of
Discharge

10

22

21

20

15

14

13

22

15

33

32

31

22

21

20

33

20

44

43

42

30

29

28

44

30

63

62

61

45

44

42

66

Bolt

Hole
Dia.
(mm)

External
battery
Cables
(Bolts)

Torque
Load
(Nm)

M6

6

M6

5

1. Input mains current listed for common rectifier and bypass AC input. For split input the rectifier current is 94% of the currents
listed.
2. Non-linear loads (switch mode power supplies) affect the design of the output and bypass neutral cables. The current
circulating in the neutral cable may exceed the nominal phase current. A typical value is 1.5 In.
3. Protective earth cable: Connect each cabinet to the main ground system must follow the most direct route possible.
The earth conductor shall be sized in accordance with the AC supply fault rating, cable lengths and type of protection. Typical
cross sectional areas are 2.5mm2 (10kVA), 6mm2 (15kVA), 10mm2 (20kVA), 16mm2 (30kVA), as per AS / IEC 60950-1
4. When sizing battery cables, a maximum volt drop of 4 VDC is permissible at the current ratings given in Table 1. The load
equipment is generally connected to a distribution board containing individually protected busbars rather than connected
directly to the UPS output. The output cables from paralleled units to the parallel distribution bus should be of same length so
as to optimise the sharing of current. Do not form coils, so as to minimise the formation of electromagnetic interference.
5. For terminal location – refer to 4.0 - Installation Drawings)

Table 2

Distance from floor to connection point on the equipment
UPS

Minimum Distance
mm (in.)

Rectifier A.C. Input supply

284 (11-1/5)

Bypass A.C. Input supply

284 (11-1/5)

UPS Output A.C.

369 (14-1/2)

Battery Power

369 (14-1/2)

Auxiliary cables: Monitor board (U2)

1104 (43-1/2)

8

Single Module UPS Installation

1.6.1

Cable Termination

NOTE
The operations described in this section must be performed by authorised electricians or
qualified technical personnel. If you have any difficulties, do not hesitate to contact our
Customer Service and Support Department. See the back page of this manual for contact
information.
Once the equipment has been finally positioned and secured, connect the power cables as described in
the following procedure.
Refer to the appropriate cable connection drawing in 4.0 - Installation Drawings.
1.

Verify that the UPS equipment is isolated from its external power source and all the UPS power
isolators are open. Check that these supplies are electrically isolated and post any necessary
warning signs to prevent their inadvertent operation.
2. Open the door to the UPS cabinet and remove the front protective cover to gain access to the
connections bars.
3. Connect the safety earth and any necessary bonding earth cables to the copper earth busbar
located on the floor of the equipment below the power connections. All cabinets in the UPS must
be connected to the user’s ground connection.
NOTE
The earthing and neutral bonding arrangement must be in accordance with local and national
codes of practice.
Identify and make power connections for incoming cables according to one of the two procedures
below, depending on the type of installation.
Common Input Connections
4. For common bypass and rectifier inputs, connect the AC input supply cables between the mains
distribution panel and the UPS input (mA-mB-mC-N terminals) and tighten the connections to
5Nm (M6 Bolt). Ensure correct phase rotation.
Split-Bypass Connections
5. If a split-bypass configuration is used, connect the AC input supply cables to the rectifier input
busbars (mA-mB-mC-N terminals) and the AC bypass supply cables to the bypass input
(bA-bB-bC-N terminals) and tighten the connections to 5 Nm (M6 Bolt). Ensure correct phase
rotation.
NOTE
For split-bypass operation, ensure that the linking busbars between bypass and rectifier input
are removed.
The AC input and the AC bypass supplies must be referenced to the same neutral point.
Frequency Converter Mode
If a frequency converter configuration is used, connect the AC input supply cables to the rectifier
input busbars (U1-V1-W1-N terminals) to 5Nm for M6 bolts, to 13Nm for M8 bolts or to 26Nm (M10
bolt). Ensure correct phase rotation and tighten the connections. There will not be any AC
bypass supply cables to the bypass input (U3-V3-W3-N terminals).
NOTE
For frequency converter operation, ensure that the linking busbars between bypass and rectifier
input are removed.

9

Single Module UPS Installation

Output System Connections
6.

Connect the system output cables between the UPS output (oA-oB-oC-N terminals) and the
critical load and tighten the connections to 5 Nm (M6 Bolt). Ensure correct phase rotation.

!

WARNING

If the load equipment will not be ready to accept power on the arrival of the commissioning
engineer, ensure that the system output cables are safely isolated at their ends.

Internal UPS Battery Connection
7. The battery consists of a series string connection of 5 x 8 (or 10) x 12V 6-cell battery blocks.
a. Ensure that the 8 (or 10) battery blocks in each tier (tray) are interconnected.
b. Connect the positive, neutral and negative cables to the UPS terminals.
c. Plug in the cables between the tiers.
d. Ensure correct polarity battery string series connections (i.e., intertier and
interblock connections are from positive to negative terminals.

!

WARNING

Hazardous Battery Terminal Voltage 480VDC
Ensure correct polarity of string end connections to the UPS terminals, i.e., positive to
positive, negative to negative and neutral to neutral, but leave these UPS terminal cables
disconnected until connection is authorised by the commissioning engineer.
Ensure correct polarity of string end connections to the battery circuit breaker and from the
battery circuit breaker to the UPS terminals, i.e., positive to positive and negative to negative,
but disconnect one or more battery cell links in each tier.
Do not reconnect these links and do not close the battery circuit breaker before authorised by
the commissioning engineer.

8. Refit all protective covers removed for cable installation.

10

Single Module UPS Installation

1.7

Control Cables and Communication

1.7.1

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:
•
•
•
•
•
•
•

Figure 2

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)
Intellislot™ interface
Modem interface
Temperature detect interface
Auxiliary terminal block detail monitoring board (U2)
J8
J3

J1

LCD

J22

X7

J23

X6

J12
J9
J2
J15

PWR
Modem
SNMP Card

J16
J17
Intellislot 2
J13

J21

J25

J28

J4

J26

J30

J10

Intellislot 1

X4
J24

Intellislot 3
BFP

INV
X1

ACF

EPO
X2

Dry In

MBC

BCB

X3

11

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

X4

X5

Single Module UPS Installation

1.8

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

1.8.1

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

Figure 3

Input dry contacts
12V

12V
12V

12V

DRV

FB

GND

OL

FUSE

F_FAN

J10
T_OT

T_IT

AUX_O

J30
AUX_I

GND

ENV

BtG

J26
GEN

12V

J4

12V

X3

X3 Ancillary Control and Alarms
X3 IN DRY: Environmental, Battery Ground Fault and Generator Contacts
The UPS accepts external signalling from voltage-free (dry) contacts connected to finger-proof, push-in terminal X3 IN DRY. Subject to prior software programming, the signalling is accepted by the UPS when
connection between the relevant terminal and the +12V terminal is altered. Cables connected to X3 IN
DRY must be segregated from power circuits (for screening purposes), double insulated and of a typical 0.5
to 1mm2 cross-section area for maximum runs between 25 and 50 meters (82-164 ft), respectively.
Table 3

Input dry contacts at X3

Position

Name

J4.1

ENV3

J4.2

BtG

J4.3

GEN1,2

J4.4

+12V

Description
Battery Room Alarm (NC)
Battery Ground Fault Detection (NC)
On Generator (NO)
+12V Power

1 - Must be configured by 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.

1.8.2

Maintenance Bypass Cabinet Interface
J26 and J30 are the MBC interface.
Table 4

Maintenance bypass cabinet interface

Position

Name

Description

J26.1

T_IT1

Input transformer overtemperature (NC)

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 (NC)

J30.3

T_OT1

Output Transformer Overtemperature (NC)

J30.4

AUX_O

Reserved

1

- Must be configured by software before becoming active

NOTE
All auxiliary cables of terminal must be double-insulated. Wire should be 0.5-1.5mm2
(16-20AWG) stranded for maximum runs between 25 and 50 meters (82-164ft.) respectively.

12

Single Module UPS Installation

1.8.3

External Circuit-Breaker Interface
J10 is the interface to any external battery circuit breaker (BCB).

External circuit-breaker interface

Table 5
Position

Name

Description

J10.1

DRV

BCB Driver Signal - (reserved)

J10.2

FB

BCB Contact State -(reserved)

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. Wire should be 0.5-1.5mm2
(16-20AWG) stranded for maximum runs between 25 and 50 meters (82-164ft.) respectively.
Jumper connection for BCB interface

UPS Monitoring Board

OL

J10
GND
FB
DRV

Figure 4

Aux – N.O.
Aux – N.O.

Battery Circuit Breaker

13

Single Module UPS Installation

1.8.4

Output Dry Contacts
There are three output dry contact relays at the X1 slot (see Figure 5 and Table 6)

Figure 5

Output dry contacts and EPO wiring
+12V

Table 6

X2

ACF_O

J28
ACF_S

ACF_C

J25
INV_O

INV_C

BFP_O

J21
BFP_S

BFP_C

J13

INV_S

X1

EPO - NO

EPO - NC

Output dry contact relays

Position

Name

Description

J13.2

BFP_O

Bypass feedback protection relay; normally open; closed when bypass SCR is shorted

J13.3

BFP_S

Bypass feedback protection relay center

J13.4

BFP_C

Bypass feedback protection relay; normally closed; open when bypass SCR is shorted

J21.2

INV_O

Inverter mode relay; normally open; closed when UPS is in inverter mode

J21.3

INV_S

Inverter mode relay center

J21.4

INV_C

Inverter mode relay; normally closed. Opened when UPS is in inverter mode

J25.2

ACF_O

Main input fault relay; normally open. Closed when main input is in fault

J25.3

ACF_S

Main input fault relay center

J25.4

ACF_C

Main input fault relay; normally closed. Open when main input is in fault

NOTE
All auxiliary cables of terminal must be double-insulated. Wire should be 0.5-1.5mm2
(16-20AWG) stranded for maximum runs between 25 and 50 meters (82-164ft.) respectively.

14

Single Module UPS Installation

1.8.5

Emergency Power Off Input
The UPS has an Emergency Power Off (EPO) function that operates by a button on the control panel
or by a remote contact provided by the user. The EPO button is under a hinged, clear plastic shield.
The X2 slot, shown in Figure 5, is the remote EPO input interface. The EPO has an 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&2 or X2: 3&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 5 and Table 7). If this function
is not used, terminals X2: 3&4 must be opened and X2: 1&2 must be closed.
Table 7

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 NC contacts.
NOTE
All auxiliary cables of terminal must be double-insulated. Wire should be 0.5-1.5mm2
(16-20AWG) stranded for maximum runs between 25 and 50 meters (82-164ft.) respectively.

X5: Auxiliary DC Power Output
Auxiliary DC power for modem or external SNMP card. The voltage is between 9V to 12V. The maximum current is 500mA.

X6: Analog Input Interface
Two analog signal channels with an input range is from 0 to +12V. The precision of detection is ÷3%.
•
•
•
•

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

X7: External Battery Temperature Detector Interface
Interface for TMP12Z temperature detector, normally connected to an external battery cabinet (see
Figure 7).
Pin reference:
•
•
•
•

X7 pin 1: Not used
X7 pin 2: +12V (Power supply for Temperature Monitoring Probe)
X7 pin 3: BAT-T (Battery Temperature signal)
X7 pin 4: GND

15

Single Module UPS Installation

Serial Ports RS232-1 and RS232-2
RS232-1 provides serial data and is intended for direct use with Liebert MultiLink monitoring and
server shutdown software.
RS232-2 provides serial data and is intended for use by authorized commissioning and service personnel.
These serial ports are shared with the optional Web browser, SNMP, ModBus and relay cards. Refer
to Table 28 regarding compatibility of simultaneous use.

Intellislot Web Browser, SNMP, ModBus and Relay Cards Interface
There are three interface slots available for optional Web browser, SNMP, ModBus and Relay cards
as illustrated in 8.0 - Options—For Assembly Inside the UPS Cabinet.

1.8.6

External Bypass Switch Interlock
EXT-Maint X3-1&2 on UPS Parallel Board M3 (leave open if no external bypass switch is used)
Provides external maintenance bypass interlock protection for the UPS. Short circuit means external
bypass closed.
EXT-Out (X3-3&4) on UPS Parallel Board (leave shorted if no external output switch is used). Provides external output interlock protection for paralleled UPS modules. Short circuit means external
output switch closed.
NOTE
UPS Parallel Board M3 is located behind protective covers accessible after opening the UPS
front door – removal of this barrier requires the use of a tool and is restricted to service
personnel.
NOTE
Jumper JP1 (located next to X3) needs to be removed for X3:3&4 to work properly.

1.8.7

Battery Start Facility
1. Rotate the switch to Normal Mode.
2. Verify that the batteries are connected.
3. Press Battery Start Button.
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.
4. After UPS has initialized, press Inverter On

Figure 6

Battery start for UPS
Battery Start Button

16

Battery Installation

2.0

BATTERY INSTALLATION

2.1

Introduction
The UPS battery bank consists of battery blocks connected in series to provide a D.C. string voltage as
required by the UPS converter. The 'AUTONOMY TIME' (the time during which the battery can
maintain supply to the load in the event of a mains failure) is limited by the ampere-hour capacity of
the battery blocks and in some cases this results in several strings being connected in parallel.
The NX usually has internal batteries, but longer run time is available by using an external battery
cabinet.
The battery cabinet will be supplied in one of the following forms:
1.
2.

Complete installation, comprising the battery cabinet, batteries and protective device.
Battery cabinets and protective device only—batteries supplied by others
NOTE
10kVA to 30kVA UPS models contain an internal battery compartment that can accommodate
up to 44 blocks of batteries for 12Ah/12V; 80 blocks of batteries for 7.2Ah/12V

The battery bank may be disconnected from the UPS for maintenance or service.

17

Battery Installation

2.2

Safety
Special care should be taken when working with the batteries associated with the Liebert NX UPS
system. When all the cells are connected together, the battery terminal voltage is potentially hazardous. The battery installation must be segregated from all but appropriately qualified maintenance
personnel by locating the cells in a key-lockable cabinet or in a purpose-designed, dedicated battery
room. When the batteries require maintenance, these precautions must be taken:
• The rotary switch must be turned to Maint. position.
• The input circuit breaker (CB1) must be opened.
• The ANDERSON connector must be disconnected..
NOTE
The fuse on the battery EMI board (UHA241A2-10kkVA, UHK241A2-15/20kVA,
UHS242A2-30kVA) is 600VDC/30A, High Speed Fuse.
NOTE
Full safety instructions concerning the use and maintenance of UPS batteries are provided in
the appropriate battery manufacturers manuals. The battery safety information contained in
this section relates to key considerations that must be taken into account during the
installation design process and might affect the design outcome depending on localised
conditions.

!

WARNING

Hazardous battery voltage present behind covers
No user-serviceable parts are located behind covers that require a tool for their removal. Only
qualified service personnel are authorised to remove such covers.
When using internal batteries in 10 to 30kVA units, the batteries are always connected
through power fuses to the UPS and to the segregated terminal bars available for connection
to an external battery.
Isolate any internal battery connections before attempting to access the segregated terminal
bars available for connection to an external battery.
The following general battery safety precautions and warnings should be observed at all
times:
• A battery can present risk of electric shock or burn from high- short-circuit currents.
• The full nominal string voltage, when the battery blocks are interconnected, is 480VDC,
which is hazardous
• Only qualified personnel should install or service batteries.
• Eye protection should be worn to prevent injury from electrical arcs.
• Remove rings, watches, necklaces, bracelets and all other metal objects.
• Use only tools with insulated handles.
• Wear rubber gloves and a rubber apron when handling batteries.
• If a battery leaks electrolyte or is otherwise damaged, it should be placed in a container
resistant to sulfuric acid and disposed of in accordance with local regulations.
• If electrolyte comes into contact with the skin the affected area should be washed immediately with plenty of clean water.
• Batteries must always be disposed of according to local environmental laws.
• When replacing batteries, use the same number and type that were originally fitted.
• Disconnect charging source before connecting or disconnecting battery terminals.
• Determine whether the battery is inadvertently grounded. If it is inadvertently grounded,
remove the source of the ground. Contact with any part of a grounded battery can result in
electrical shock.

18

Battery Installation

2.3

Battery Cabinet

2.3.1

Introduction
This cabinet can also be used in conjunction additional cabinets, to provide the necessary accommodation required by the larger cells associated with system’s having a long autonomy time.
Where two (or more) cabinets are used they are positioned alongside each other and secured and
bonded together. If the cabinet(s) is located immediately adjacent to the main UPS equipment the two
units are bolted together.

2.3.2

Temperature Considerations
Valve-regulated, lead acid battery cells are sensitive to ambient temperature and should be operated
between 15°C and 25°C (59-77°F). Battery capacity is increased by 1% for every 1°C (2°F) increase in
temperature up to 25°C (77°F). Battery life is reduced at temperatures above 25°C (77°F).
When batteries are mounted in the same room as the UPS unit, it is the battery that dictates the
designed maximum ambient temperature, not the UPS. — i.e. in the case of valve-regulated cells, the
ambient room temperature should be kept between 15°C and 25°C (59-77°F), and not between 0°C
and 40°C (32-104°F) (which is the specified main equipment operating temperature range). Temperature deviations are permissible for short periods, provided the average temperature does not exceed
25°C (77°F).

2.3.3

Dimensions
The external dimensions are shown in Table 8. These are the same height and depth as the UPS
module and provide a matching appearance when bolted together. All cabinets are fitted with doors,
which must be fully opened in order to fit or remove the batteries. The door swing must therefore be
taken into consideration when planning the positioning of the cabinets.

2.3.4

Weight
The unladen weight is shown below in Table 8. When designing the battery installation the weight of
the batteries and cables must be added to the unladen weight. This is particularly important when
placing the NX on a raised floor.
Table 8

Dimensions and weight

Model

Battery Cabinet

2.3.5

Optional
Circuit Breaker
Amperes

Maximum
Discharge Current
(at EOD)

External Cabinet
WxDxH mm (in)

50A

10kVA 22A
15kVA 33A
20kVA 44A

820x700x1400
(32-1/4x27-5/8x55)

80A

30kVA 66A

Cabinet Weight
Without Batteries
kg (lb)

170 (375)

Circuit Isolator Features
The UPS is fitted with Anderson connectors and fuses for connection and disconnection of internal
batteries. External battery banks require battery fuses or circuit breaker (with optional status contacts). Refer to 1.8.3 - External Circuit-Breaker Interface for details.

19

Battery Installation

2.3.6

Battery Temperature Sensor (Optional)
The optional external battery temperature sensor kit contains one probe and one temperature transport board as illustrated in Figure 7. It is connected to the UPS Monitor Board.

Figure 7

Single temperature sensor and monitor board-U2
Name: W2 L=5m
Temperature
Sensor

Name: W1 L=30m

X7
NC
12V
OUT
GND

+
IN
TMP-2

Monitor
Board
– U2
-12V
BAT-T
GND
UPS

Cable W2 is packed with the temperature sensor.

2.3.7

Moving the Battery Cabinets

!

WARNING

Ensure any lifting equipment used in moving the cabinet has sufficient lifting capacity.

Ensure that the weight is within the designated surface weight loading of any handling equipment.
See Table 8 for weight details.
Battery cabinets can be handled by means of a fork lift or similar equipment.
NOTE
Care must be taken when maneuvering units fitted with batteries. Keep such moves to a
minimum.
When the equipment has been finally positioned ensure the adjustable feet are set so that the
battery cabinet will remain stationary and stable.
Seismic anchors option is available for anchoring the unit to a concrete floor.

2.3.8

Cable Entry
Cables enter the battery cabinet from the bottom. Cable entry is made possible by removing a blanking piece fitted at the bottom to reveal the cable entry hole.

20

Battery Installation

2.3.9

General Arrangement Drawings
Refer to Figures 8 and 10 for general arrangement of battery cabinet models.

Figure 8

Battery cabinet bottom cable entry location

Bottom View
700
250

82,5
100 83

1400

620
828
All dimensions are
expressed in millimeters.

21

Battery Installation

Figure 9

Battery cabinet with fuse or optional circuit breaker locations

Bottom cable entry

22

Battery Installation

Figure 10 Battery cabinet internal layout
Positions of captive nuts for grille mounting

292

328,4

102

Minimum service space 65mm

B

65

29
280

280

280

280
65

Captive nut M6

43

215

1.

3 Layers:
Largest battery dimensions:
201x170x190 (LxWxH)

170 10 170

5

218

201 10 201

5

15

635

201 10 201 10 201

1 Layer:
Largest battery dimensions:
201x170x190 (LxWxH)

368

7

635

170 10 170 10 170 10 170

308,6

218,5

437,8

280

65

15

738

All measurements are in millimeters.

AMNXE0NBCSL4BT

23

Detail B

Hex flange
screw M6x16

Battery Installation

Figure 11 Battery cabinet, bottom entry
12
11

13
4
6

1

7

8
4
6
13
12
8

9
5

AMNXE0NBCSL4BT
2

10

3

Item #

Item Name

1

Grille steel

2

Grille steel

3

Middle pillar

4

Cover module BC Small NXe

5

Ground bus

6

Captive nut M4

7

Captive nut M6

8

Screw flange M6x16

9

Nut flange M6

10

Screw M6x16 countersink

11

Spring washer M4

12

Flat washer M4

13

Screw mushroom head cross M4x12

2.4

Battery Power Cables

2.4.1

Connection Principles
The following notes, in conjunction with the diagrams, illustrate the broad principles to be followed
when fitting and connecting the majority of battery installations.

24

Battery Installation

2.4.2

Fitting the Batteries
1. In general, at least 10mm (3/8") must be left unobstructed on all vertical sides of the battery
blocks to permit free air movement around the cells.
2. Clearance should be allowed between the top of the cells and the underside of the shelf above (this
is necessary for monitoring and servicing the cells).
3. When installing the batteries on racks always work from the bottom shelf upwards to prevent
raising the centre of gravity.

2.4.3

Connecting the Battery
1. When the battery cabinet is installed on a raised floor the battery power cables and optional circuit
breaker control cables can be routed to the UPS cabinet via the floor of the cabinet. If the UPS and
battery cabinet are located adjacent to each other and located on a solid floor these cables can be
passed between the cabinets via the lifting apertures located in the lower sides of the cabinets.
2. In general it is recommended that the inter-connecting cables be fitted to the batteries within
their particular level before fitting the inter-level connecting cables, followed finally by the cables
to the circuit breaker.
3. An insulating shroud should be fitted to each terminal after its connection has been made.
4. When connecting the cables between the battery string ends to the optional circuit breaker always
connect the circuit breaker end of the cable first.

2.4.4

Battery Room Design
Whatever the type of mounting system selected, the following conditions should be noted:
• Cell Layout—1
Whichever battery mounting system is used, the batteries should be arranged to prevent the possibility of simultaneous contact with two exposed live parts having a potential greater an 150V.
Where this is not possible, insulated terminal shields must be installed and insulated cables must
be used for connections.
• Service Platform—2
The service platform (or duckboard) must be slip-proof, insulated from the floor and at least one
metre (39 in.) wide.
• Connections—3
All connections must be as short as possible.
• Battery Protection Fuses/Circuit Breaker—4
The battery circuit breaker is generally installed at the front of the battery room. See 2.5 - Battery Control for details on connecting the circuit breaker box available for the Liebert NX.

Figure 12 Battery room design

4

1

3
2

2.5

Battery Control
Battery temperature sensor cables are connected between UPS auxiliary terminal block X3 BCB, the
Battery Temperature sensor and the battery as shown in Figure 7.
Cables connected to X3 BCB must contain a protective earth wire or a shield, be segregated from
power circuits, double insulated and of a typical 0.5 to 1mm2 cross section area for maximum runs
between 25 and 50 meters respectively. The shield should be connected to the protective earth of the
battery cabinet or battery breaker, not at the UPS
25

UPS Multi-Module Installation

3.0

UPS MULTI-MODULE INSTALLATION

3.1

General
The installation of a multi-module UPS configuration must follow the installation procedure for a single UPS module with the additional requirements detailed in this chapter.
In addition to the local EPO push button on the front panel of the UPS module (that stops operation of
that module), the UPS supports also a remote emergency stop to permit simultaneous multi-module
shutdown.
NOTES
1. The remote emergency power off switch must be voltage-free and Normally Open or
Normally Closed.
2. The open voltage supplied is 12VDC, < 20mA
3. This external emergency stop may be supplied with a second set of contacts that can be used
to trip incoming mains or bypass supply circuit breakers supplied by others and fitted with
remote trip units.
4. Normally Closed EPO - X2: 1&2, these terminals are supplied factory-linked on the monitor
board.

Figure 13 Emergency power off connections
UPS2
X2:3
X2:4
X2:3
X2:4

Monitor Board

Monitor Board

UPS1

EPO
UPS2
X2:1
X2:2
X2:1
X2:2

Monitor Board

UPS1

EPO

26

Monitor Board

UPS Multi-Module Installation

3.2

Paralleled UPS Modules
The basic installation procedure of a parallel system comprising two or more UPS modules is the
same as that of single module system. The following sections only introduce the installation procedures specific to the parallel system.

3.2.1

Cabinet Installation
Place the UPS modules side by side and interconnect as shown in Figure 14. The distribution panel
(external bypass cabinet) is optional but recommended for ease of maintenance and system testing.

Figure 14 Typical 1+N system block diagram with common input supply, with separate batteries and
optional output / bypass distribution panel

SUPPLIED BY OTHERS

INPUT MAINS

INPUT MAINS

SUPPLY L1, L2, L3, N

UPS1

SUPPLY L1, L2, L3, N

CB1

UPS2

RECTIFER

CB1

RECTIFER

SW1-C

FUSES

SW1-C

FUSES
STATIC
SWITCH

CHARGER

STATIC
SWITCH

BATTERY 2

BATTERY 1

CHARGER

INVERTER

INVERTER

SW1-A

SW1-A

L1, L2, L3, N

L1, L2, L3, N

Q2EXT

Q1EXT

QUPS

SW1-D

Distribution Cabinet

TO LOAD

27

QBYP

UPS Multi-Module Installation

Figure 15 Dry contacts, multiple UPS modules with distribution panel

Input Distribution

UPS 1

UPS 2

UPS N

M3 Board
X3

M3 Board
X3

M3 Board
X3
Ext. Maint. Ext. Out

Ext. Maint. Ext. Out

Ext. Maint. Ext. Out

1 2 3 4

1 2 3 4

1 2 3 4

Q1Ext

Q2Ext

Distribution Panel

QUPS

QnExt

QByp

To Load

3.2.2

External Protective Devices
Refer to the instructions in 1.0 - Single Module UPS Installation.

3.2.3

Power Cables
The wiring of power cables is similar to that of single module system. The Bypass and the Main input
sources must be referenced to the same neutral potential and input earth leakage monitoring devices,
if installed, must be located upstream of the common neutral sinking point. Refer to the instructions
in 1.0 - Single Module UPS Installation.
NOTE
The length and specification of power cables including the bypass input cables and UPS output
cables should be the same. This facilitates load sharing when operating in bypass mode.

28

UPS Multi-Module Installation

3.2.4

Control Cables
Intermodule Control
Shielded and double insulated control cables available in lengths of 5, 10 and 15 meters must be must
be interconnected in a ring configuration between UPS modules as shown below. The parallel control
board is mounted on the top, behind protective cover of each UPS module (refer to Figure 23). The
ring configuration ensures high reliability of the control. Refer to Figure 16.

Figure 16 Connection of 1+N system parallel control cables

3.3

Hot-Standby UPS Modules

3.3.1

Cabinet Installation

X1-2

X1-2

X1-1

X2-1

P1

X2-2

P2

P1

P2
X1-1

X2-1

X1-2
P4

X1-1

X2-2

X4

P3

X1-2

X2-1

P1

P2

P2
X1-1

X2-2

Parallel Board
X3
P5

X4

P4

X1-2

X4

X2-1

6

Parallel Board
X3
P5

P3

X1-1

X2-2

5

Parallel Board
X3
P5

P3

X1-2

X2-1

4

X4

P3

P1

P2

X2-2

P3

P3

X1-1

X2-1

P4

P2

X2-2

X4

P1

X4

Parallel Board
X3
P5

P1

Parallel Board
X3
P5

P4

Parallel Board
X3
P5

UPS

3

P4

2

P4

1

Place the UPS modules side by side and interconnect as shown below.
The hot standby mode comprises two series connected UPS modules of the same rating. One module
is designated as the hot standby master (downstream), and the other module is designated as the hot
standby slave (upstream). Their roles are determined by power connection and configuration software. In normal operation, both slave and master operate in normal mode and the output from one
upstream (slave) UPS feeds the bypass input to the other (downstream/master) UPS. The output of
the downstream (master) UPS is connected to the critical load and is always synchronised to the output of the upstream (slave) UPS. If the inverter of the UPS connected to the load fails, the inverter of
the upstream (slave) UPS supplies the load through the downstream (master) UPS bypass circuit.
The system can be programmed to cycle the downstream (master) UPS between normal mode and
bypass mode so that both ups are equally exercised.
NOTE
If it is a hot-standby system, the master (downstream) must be turned on first.

3.3.2

External Protective Devices
Refer to the instructions in 1.0 - Single Module UPS Installation.

29

UPS Multi-Module Installation

3.3.3

Power Cables
The wiring of power cables is similar to that of single module system except that the output of the
upstream UPS is fed into the bypass input of the downstream UPS, and the load is fed by the downstream UPS through its inverter or bypass. The bypass and the main input sources must be referenced to the same neutral potential and input earth leakage monitoring devices, if installed, must be
located upstream of the common neutral sinking point. Refer to the instructions in 1.0 - Single Module UPS Installation.
No control wires other than those specified for the single module configuration are required.

Figure 17 Hot standby configuration

INPUT DISTRIBUTION
UPSTREAM

DOWNSTREAM

Bypass L1,
L2, L3, N

Mains L1,
L2, L3, N

Bypass L1,
L2, L3, N

Mains L1,
L2, L3, N

CB1

CB1
RECTIFIER
STATIC
SWITCH
INVERTER

L1, L2, L3, N

L1, L2, L3, N

UPS1
OUTPUT
TO LOAD

30

UPS Multi-Module Installation

3.4

Dual Bus System

3.4.1

Cabinet Installation
The Dual Bus System consists of two independent UPS configurations each consisting of one or more
UPS modules. Dual Bus Systems are high availability configurations suitable for loads with multiple
input terminals. For single input loads an optional Static Transfer Switch may be added and the standard Load Bus Synchroniser activated. Depending on the configuration, follow the appropriate installation instructions for each system.
Place the UPS modules side by side and interconnect as shown below.
The objective of the Dual-bus Synchronizer (DBS) is to keep the output of two independent UPS systems (or parallel systems) in synchronization. One system is designated as the master; the other is
designated as the slave. The operating modes covered comprise master and or slave operating
inverter or bypass mode.

Figure 18 Typical dual bus system configuration with static transfer switch and Load Bus Synch
Bypass
supply

Bypass
supply

Input
Rectifier
UPS 6

Input
Rectifier
UPS1

Intermodule
control cable

Input
Rectifier

LBS

Input
Rectifier
UPS 6

UPS1

Intermodule
control cable

STS

Load

3.4.2

External Protective Devices
Refer to the instructions supplied in 1.0 - Single Module UPS Installation.

3.4.3

Power Cables
The wiring of power cables is similar to that of single module system. The Bypass and the Main input
sources must be referenced to the same neutral potential and input earth leakage monitoring devices,
if installed, must be located upstream of the common neutral sinking point. Refer to the instructions
in 1.0 - Single Module UPS Installation

31

UPS Multi-Module Installation

3.4.4

Control Wires
For Liebert NX to NX dual bus configuration, interconnect the optional DBS cable between any DBS
ports of two parallel systems as illustrated in Figure 19.

Figure 19 Connections of a typical dual bus system utilising Load Bus Synch

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

DBS Cable

P4

X1-1
P3

P4

X1-2

X2-1

Parallel Board
X3
P5

X4

P4

X2-2

P2

X2-1

P1

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

NOTE
Example shown with ring control cables ("8") for DSB applied to two 1+1 paralleled systems.

3.4.5

Extended Dual Bus Synchronization Option (DBS Interface Box)
For Liebert NX to non- NX (whether another Liebert UPS range or not) dual bus configuration, one
DBS interface box shall be mounted on the non- Liebert NX UPS. In this situation, the other UPS system is always treated as a master and the following conditions are covered:
• Master and slave are both on inverter
• Master on bypass, slave on inverter
NOTE
Extended DBS interface box is also used for extending DBS cable length up to
150 meters (490ft) for DBS configuration between two groups of NX UPS systems.

32

Installation Drawings

4.0

INSTALLATION DRAWINGS

Figure 20 Electrical connections

Earth
UPS

To Customer’s Safety
Earth

A
X3

Ext. Maint.

B
Parallel Board

C

Ext. Out

To Critical Load

N

Power
Cables
A
B
X5

X4

ModemSNMP

Main/Bypass Input
Supply

N

RS-485

J4
Gen

J13

BPS

J21

AFC

J25

X2 Ext EPO

Input

X3
J26
MBC
J28-1
J28-2
J28-3
J28-4

BCB

J30
X3

External Battery

X7

J10-1
J10-2
J10-4
J10-3
J22-2
J22-3
J22-4

X1

C

Monitor Board

+ N Batt

33

Installation Drawings

Figure 21 General arrangement—10-30kVA UPS module
600

700

10mm dia threaded
mounting holes

2
7

86.5

1400

1
Leve
Detail A, rear of unit
shown without side panel

Leveling feet

90
LEFT SIDE VIEW

FRONT VIEW

420
180

3

5
4

867.5
708

572
6

1380
166
210

236
346
520

625

BOTTOM VIEW

TOP VIEW

All dimensions are in mm.

34

1) Air inlet grille
2) Air outlet grille
3) Adjustable fixing feet
4) Castors for maneuvering
5) Seismic anchors (option)
6) Cable entry
7) Operator control and display panel

Installation Drawings

Figure 22 10-30kVA NX front view with doors open
1) Main/Bypass Input terminal (T1)
2) Battery /Output terminal (T2)
3) Input circuit breaker (CB1)
4) Rotary switch (SW1)
5) Monitor board (U2)

5

4

3

2
1

T2
External Battery Input
Output
T1
Main Input
Bypass Input

35

Installation Drawings

Figure 23 Location of parallel logic board M3

Battery
Start
Interface

Parallel
Logic
Board

NXe 10-30kVA Top View

36

Installation Drawings

Figure 24 Internal battery layout and connecting—GP12120 F2 (12AH/12V)
BOTTOM LAYER
Layer 5

Layer 4

43

W501 4pcs

Layer 3

TOP LAYER
Layer 1

Layer 2

41

44

42

W500
34Pcs

77

55

33

1 1

W503 BLK W502

W511 BLK W510

W515 BLK W514

W513 BLK W512

W506
W506
BLU

W504
A A

BLK

W508
RED

W508

W509 W505

J2

J4

J6
NIN

+BATT IN

BATTERY INTERCONNECT
WIRING DIAGRAM

W507

NOTE

-BATT IN

1. TYPICAL USED FOR:GP 12120 F2 (12AH/12V)
2. REMOVE 43&44 WHEN 42 JARS ARE USED.
REMOVE 41~44 WHEN 40 JARS ARE USED.

A2 BOARD
UPS MODULE

Figure 25 Internal battery layout and connecting—LC-R127R2PG1 (7.2AH/12V)
BOTTOM LAYER
Layer 5

Layer 4

Layer 3
W520

W501 4Pcs

TOP LAYER
Layer 1

Layer 2

W517

W500
68Pcs

W514

W513

BLK

W512

W506
BLU W506

BLK

A A W504

RED

W508

W508

W509 W505
J2
+BATT IN

W507

J4

J6
NIN

BATTERY INTERCONNECT
WIRING DIAGRAM

-BATT IN

A2 BOARD
UPS MODULE

NOTE

37

1

TYPICAL USED FOR: LC-R127R2PG1 (7.2AH/12V)

RED

BLK

W521

11

M M

W515

K K

W510

E E

BLK

BLU

I

W511

I

W502

W519

33
RED

BLK

BLK

W503

5 5

BLK

W518

77

C C

BLU

G G

W516

Installation Drawings

Figure 26 Internal battery layout

347mm

151mm

562mm

160mm

160mm

160mm

160mm
Battery

136mm

38

Operation

5.0

OPERATION
!

WARNING

Hazardous Mains and / or Battery Voltage present behind covers.
No user-serviceable parts are located behind covers that require a tool for their removal. Only
qualified service personnel are authorised to remove such covers.

5.1

Introduction
Liebert’s NX™ Uninterruptible Power System system provides continuous, high-quality AC power to
your business-critical equipment, such as telecommunications and data processing equipment. The
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 NX utilizes the latest in high frequency, double-conversion pulse width modulation (PWM) technology and fully digital controls to enhance its reliability and increase the ease of use.
The standard NX consists of the UPS and internal batteries in a compact, single cabinet.
As shown in Figure 27, 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 27 Single unit block diagram with split-bypass input
SW1/D

Maintenance Bypass
Static Swich

Bypass
Input

SW1/C

UPS
Output

AC Utility
Input

SW1/A
CB1
Rectifier

Neutral
Wire

Discharge

Inverter

Static Swich
SW1/B

Battery
Charger
Neutral
Wire
Battery

5.1.1

Split-Bypass Input
Figure 27 illustrates the Liebert NX UPS in what is known as the split-bypass configuration wherein
a separate power switch to a dedicated bypass power source that also feeds the maintenance bypass
line connects the static bypass line. Where a separate power source is not available, the bypass and
rectifier input supply connections are linked.

39

Operation

5.1.2

Static Transfer Switch
The circuit blocks labeled Static Switch in Figure 27 contain electronically controlled switching circuits that enable 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; but in the event of a UPS overload or 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
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.

5.1.3

Battery Temperature Compensation
For 10-30kVA UPS with internal batteries, a standard temperature probe is installed to measure the
internal battery temperature to optimize battery management. The measured temperature can be
displayed from the UPS front panel.
For UPS with external batteries, an optional battery temperature interface equally optimises the
external battery management by connecting up to four external temperature sensors from the battery
cabinet(s) to a control unit inside the UPS.

Figure 28 Multiple battery temperature sensors
Temperature
Sensor

+
IN
TMP-2

X103

NC
12V
OUT
GND

Temperature
Sensor

X104

NC
12V
OUT
GND

+
IN
TMP-2

X108
+12V
OUT
GND

Temperature
Sensor

X105

NC
12V
OUT
GND

+
IN
-

BCB Control
Board – C2

X106

NC
12V
OUT
GND

+
IN
TMP-2

BCB Box

40

Monitor
Board
– U2
-12V
BAT-T
GND
UPS

TMP-2

Temperature
Sensor

X7

Operation

5.1.4

Redundant Control Power Supply Board
The UPS is equipped with two identical and fully redundant control power supply boards. Each of
them takes inputs from the AC and DC sources. When one of the sources or even if one of the control
power boards fails, the UPS system can still operate normally. This feature further enhances the reliability of the system.

5.1.5

Socket Outlet
One single-phase Shuko-type universal outlet of 3A current handling capability provides nominal
UPS output voltage of up to 3A current capacity for the ease of testing, commissioning & servicing of
the UPS.

5.2

Multi Module UPS—1+N
Multi-module UPS are formed by several “single unit” UPS modules to constitute “1+N”system where
groups of one or more, up to six, single units operate together for the purpose of providing additional
power or reliability or both. The load is equally shared between any paralleled UPS.

Figure 29 1+N multi-module UPS with external maintenance bypass switch
Qin UPS1

Qin UPS2

Qin UPS3
Qin Ext
Byp

Supplied by Others
Input Mains Supply

Input Mains Supply

L1,L2,L3,N

CB1

L1,L2,L3,N

Input Mains Supply

Bypass Mains Supply
L1,L2,L3,N
L1,L2,L3,N

Bypass Mains Supply
L1,L2,L3,N
L1,L2,L3,N

L1,L2,L3,N

CB1

CB1

RECTIFIER

RECTIFIER

RECTIFIER

STATIC
SWITCH

STATIC
SWITCH

STATIC
SWITCH

INVERTER

INVERTER

INVERTER

UPS1
OUTPUT
Qout UPS1

Qout all UPS

L1,L2,L3,N

UPS2
OUTPUT
Qout UPS2

Distribution Cabinet

UPS3
OUTPUT
L1,L2,L3,N
Qout UPS3

Qout Byp

Further, single unit or 1+N groups may be configured as “distributed redundant” systems with independent outputs that nevertheless are synchronised through a Load Bus Synchroniser (LBS) so that
critical loads can be seamlessly transferred from one system to another. See 5.3 - Modes of Operation for more information.

41

Operation

5.2.1

Features of NX Multi-Module UPS Configurations
1. The hardware and firmware of single module UPS units is completely compatible with the
requirements of a multi-module system. Multi-module configuration is achieved merely through
settings in configuration software.
2. Parallel control cables are connected in a ring, providing both performance and redundancy.
Dual-bus control cables are connected between any two UPS modules of each bus. The intelligent
paralleling logic provides the user with maximum flexibility. For example, shutting down or
starting up UPS modules in a parallel system can be done in any sequence. Transfers between
Normal and Bypass modes of operation are synchronised and self –recovering e.g. following
overloads and their clearance.
3. The total load of the multi-module system can be queried from each module’s LCD display.

5.2.2

Requirements for Paralleling of UPS Modules
A group of paralleled modules behave as if it were one large UPS with the advantage of presenting
higher reliability. In order to assure that all modules are equally utilised and to comply with relevant
wiring rules, the following requirements apply:
1. All UPS modules must be of the same rating and must be connected to the same bypass source.
2. The bypass and the main input sources must be referenced to the same neutral potential.
3. Any RCD, Residual Current monitoring device, if installed, must be of an appropriate setting and
located upstream of the common neutral bonding point. Alternatively, the device must monitor
the combined 4-wire rectifier and split-bypass input currents of the system. Refer to the High
Leakage Current Warning on page 1.
4. The outputs of all UPS modules must be connected to a common output bus.
NOTE
Optional isolation transformers are available for applications where sources do not share the
same neutral reference or where the neutral is not available.

5.3

Modes of Operation
The NX UPS is an on-line, double-conversion, reverse-transfer UPS that permits operation in these
modes:
•
•
•
•
•
•
•
•
•

5.3.1

Normal Mode
Battery Mode (Stored Energy Mode)
Auto-Restart Mode
Bypass Mode
Maintenance Mode (Manual Bypass)
ECO Mode
Parallel Redundancy Mode
Hot-Standby Mode
Frequency Converter Mode

Normal Mode
The UPS inverter continuously supplies the critical AC load. The rectifier/charger derives power from
the AC mains input source and supplies DC power to the inverter while simultaneously FLOAT or
BOOST charging its associated backup battery.

5.3.2

Battery Mode (Stored Energy Mode)
Upon failure of the AC mains input power; the inverter, which obtains power from the battery, supplies the critical AC load. There is no interruption in power to the critical load upon failure or restoration of the AC mains input power after which the “Normal Mode” operation will continue without the
necessity of user intervention.

5.3.3

Auto-Restart Mode
The battery may become exhausted following an extended AC mains failure. The inverter shuts down
when the battery reaches the End Of Discharge voltage (EOD). The UPS may be programmed to
“Auto Recovery after EOD” after a delay time. This mode and any delay time are programmed by the
commissioning engineer.
42

Operation

5.3.4

Bypass Mode
If the inverter overload capacity is exceeded, or if the inverter becomes unavailable for any reason,
the static transfer switch will perform a transfer of the load from the inverter to the bypass source,
with no interruption in power to the critical AC load. Should the inverter be asynchronous with the
bypass, the static switch will perform a transfer of the load from the inverter to the bypass with interruption in power to critical AC load. This is to avoid paralleling of unsynchronised AC sources. This
interruption is programmable but typically set to be less than 3/4 of an electrical cycle, e.g., less than
15ms (50Hz) or less than 12.5ms (60Hz).

5.3.5

Maintenance Mode (Manual Bypass)
A manual bypass switch is available to ensure continuity of supply to the critical load when the UPS
becomes unavailable e.g. during a maintenance procedure. This manual bypass switch is fitted in all
UPS modules and rated for full load of one module.

5.3.6

ECO Mode (Single UPS Only)
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 are beyond pre-defined and adjustable limits the critical AC load is 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).

5.3.7

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

5.3.8

Hot-Standby Mode
This is an alternative 1+1 redundancy application that ensures higher availability or better usage
control or both. Two UPS are connected in Hot Stand By mode as follows: UPS 1connects to the critical load, and UPS 2 connects to the bypass of UPS 1. The remaining AC inputs are connected to the
incoming AC mains supply. UPS 1 synchronises to the output of the UPS 2 ensuring uninterrupted
load transfer from UPS 1 to UPS 2 or vice versa. This ensures that any specified load is supplied by a
UPS while still providing a bypass path to cater for overloads. Further, the system can also be programmed to reverse UPS1 between Normal and Bypass Modes so that each UPS is equally utilised.
This interval is programmable from 1 to 4,320 hours (180 days).

5.3.9

Frequency Converter Mode
The NX UPS can be programmed into frequency converter mode for either 50Hz or 60Hz stable output frequency. The input frequency may vary from 40Hz to 70Hz. 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).

43

Operation

5.4

Battery Management—Set During Commissioning

5.4.1

Normal Function
• Constant charging current—Current can be set up to limit charging power.
• Constant boost voltage boost (if applicable)—Voltage of boost charging can be set as required
by the type of battery.
For Valve Regulated Lead Acid (VRLA) batteries, maximum boost charge voltage should not
exceed 2.4V / cell.
• Float Charge—Voltage of float charging can be set as required by the type of battery.
For VRLA, float charge voltage should be between 2.2V to 2.3V.
• Float Charge Temperature Compensation (optional)—A coefficient of temperature compensation can be as required by the type of battery.
• End of discharge protection (EOD)—If the battery voltage is lower than the EOD, the battery
converter will shut down and the battery is isolated to avoid further battery discharge. EOD is
settable from 1.6V to 1.75V per cell (VRLA) or 0.9 to 1.1 V per cell (NiCd).
• Battery Low Warning Time—Settable between 3 and 60 minutes. The default is 5 minutes.

5.4.2

Advanced Functions (Software Settings Performed by the Commissioning Engineer)
Battery Self-Test and Self-Service
At periodic intervals 20% of the rated capacity of the battery will be discharged automatically. The
minimum amount of load must exceed 20% of the nominal rating of the UPS module. If the load is less
than 20%, auto-discharge cannot be executed. The periodic interval can be set from 30 to 360 days.
The periodic testing can also be inhibited.
• Conditions—Battery float charge for at least 5 hours, load 20~100% of rated UPS capacity
• Trigger—Manually through through the command of Battery Maintenance Test in the LCD
panel or automatically
• Battery Self-Test Interval—30-360 days (default setting is 60 days)

5.5

Battery Protection (settings by commissioning engineer)
Battery Undervoltage Pre-warning
The battery undervoltage pre-warning occurs before the end of discharge. After this pre-warning, the
battery should have the capacity for 3 remaining minutes discharging with full load. The time is user
configured from 3 to 60 minutes.
Battery End of Discharging (EOD) Protection
If the battery voltage is lower than the EOD, the battery converter will be shut down. EOD is settable
from 1.6V to 1.75V per VRLA cell (or 1.0 to 1.1V per NiCd cell).
Battery Isolator Open Warning
If the battery isolator is open, this warning will occur.
The external battery to the UPS through an external battery isolator, which is manually closed and
electronically tripped via the UPS control circuits.

44

Operating Procedures

6.0

OPERATING PROCEDURES
!

WARNING

Hazardous mains and / or battery voltage present behind covers.
No user-serviceable parts are located behind covers that require a tool for their removal. Only
qualified service personnel are authorised to remove such covers.

6.1

Introduction
The NX can operate in any of four modes, as shown in Table 9. This section provides instructions on
switching between modes, resetting the UPS, switching the inverter On and Off and performing other
operations.
Table 9

UPS operating modes
Rotary Switch
Position
NORMAL

Operating Mode
Normal Operation
On Static Bypass

BYPASS or
NORMAL

On Test

TEST

On Maintenance
Bypass

MAINT

Description
The UPS is powering the load.
The load power is supplied through the static bypass line. This may be
considered as a temporary mode during load transfers between inverter
and maintenance bypass or supply under abnormal operating conditions.
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.
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.

NOTE
1. The user controls and indicators mentioned in these procedures are identified in 7.0 Operator Control Panel and Display.
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 unit 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 NX, the unit must be
commissioned by a Liebert factory-trained service engineer.

6.1.1

Power Switches
The UPS unit power switches are CB1 and SW1.
• CB1-Input Current Breaker. Connects the utility supply to the UPS input.
• SW1 - Rotary switch. Has four positions—NORMAL, BYPASS, TEST and MAINT—that correspond to different positions of the SW1-A/B/C/D.
The positions of the rotary switch (SW1) are:
• SW1-A—Output Isolator. Connects the output of the UPS to the load.
• SW1-B—Neutral Isolator. Connects neutral to the UPS.
• SW1-C—Bypass Isolator. Connects the UPS with the bypass supply.
• SW1-D—Maintenance Bypass Isolator. Permits supply of the load directly by the bypass line for
maintenance of the UPS unit.
The functions of the rotary switch are shown in Table 10.
Table 10
Rotary switch configurations
Rotary Switch
Position
NORMAL
BYPASS
TEST
MAINT

OUTPUT (SW1-A)

BYPASS (SW1-C)

✔
✔

✔
✔
✔

MAINT
(SW1-D)

✔
✔
45

NEUTRAL (SW1-B)
✔
✔
✔

Operating Procedures

6.2

UPS Startup
The 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.

6.2.1

Start-Up Procedure
To start the UPS from a fully powered-down condition:
1. Open the UPS door to gain access to the main power switches.

!

WARNING
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.

!

CAUTION
Do not operate the rotary switch too fast. Always wait at least 30 seconds when rotating the
switch from one position to another

2. Close CB1.
3. Turn the rotary switch to TEST.
The bypass static SCR (M2) closes automatically and the LCD begins to show start-up 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. After
initialization, the bypass static switch closes.
Because output switch SW1-A is still open, the UPS channels power through Maintenance Bypass
Supply line (SW1-D). The bypass indicator extinguishes, provided that the bypass is normal.
The UPS mimic display indicators will be:
Indicator
Rectifier indicator

State
Off

Battery indicator

Off

Bypass indicator

Off

Inverter indicator

Off

Load indicator

Off

Status indicator

Off

!

WARNING

Do NOT turn the rotary switch until the rectifier indicator stops flashing green.
4. Turn the rotary switch to BYPASS.
Indicator

State

Rectifier indicator

Green

Battery indicator

Off

Bypass indicator

Green

Inverter indicator

Off

Load indicator

Green

Status indicator

Amber

The maintenance switch SW1-D opens and output switch SW1-A closes. The UPS powers from
static bypass instead of from maintenance bypass. The bypass and load indicators turn on. The
design of the rotary switch ensures uninterrupted output.

46

Operating Procedures

5. Turn the rotary switch to NORMAL, then 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 transfers from bypass to inverter, the bypass indicator turns off and the inverter and load
indicators turn on.
The UPS is operating normally. The UPS mimic display indicators will:

6.2.2

Indicator

State

Rectifier indicator

Green

Battery indicator

Off

Bypass indicator

Off

Inverter indicator

Green

Output indicator

Green

Status indicator

Green

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 NX.
To return to normal mode, wait a few seconds and close CB1. The rectifier will restart automatically after 10 seconds and resume feeding power to the inverter.
Switch from Normal Mode to Bypass Mode
• Press 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
• Turn the rotary switch to NORMAL.
• In bypass mode, press the INVERTER ON button. When the inverter is ready, the UPS will
switch to normal mode.

47

Operating Procedures

6.3

Switching the UPS from Normal to Maintenance Bypass
Follow the procedure below to transfer the load from the inverter output to the Maintenance Bypass
line of the UPS.

!

CAUTION

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 UPS is operating normally.
1. Press the INVERTER OFF button on the right side of the operator control panel for longer than 2
seconds.
The Inverter indicator will turn off and the status indicator (6) 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 appropriate condition is rectified.
2. Open the UPS door to gain access to the main power switches, SW1 and CB1.
3. Turn the rotary switch to BYPASS position. The UPS Bypass Static Switch still supply power to
load.
4. Turn the rotary switch to TEST. The load is now on maintenance bypass.
5. Turn the rotary switch to MAINT.
6. Open rectifier switch CB1. 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.

!

6.4

WARNING

Wait 5 minutes for the internal DC busbar capacitors to discharge before attempting to
remove the internal protective barriers.

!

WARNING

!

CAUTION

Even with the UPS rotary switch in maintenance bypass position portions of the unit are still
energized. Service is to be performed by qualified personnel only.

The load equipment is not protected from normal supply aberrations when operating in the
maintenance bypass mode.

Powering Down the UPS
To power down the UPS completely, follow the procedures in 6.3 - Switching the UPS from Normal to Maintenance Bypass.
To completely isolate the UPS from the AC supplies, the main external power input isolator (both isolators, where separate supplies are provided for rectifier and bypass) should be opened (see
Figure 30).

!

WARNING

To prevent injury to personnel, lockout or tagout the service supplies.

48

Operating Procedures

6.5

Powering Down the UPS and Maintaining Power to Load
NOTE
An external Maintenance Bypass Cabinet must be installed before attempting to perform the
following procedure
If the UPS needs to be shut down completely while maintaining power to the load, follow these steps:
1. Perform Steps 1 through 5 in 6.3 - Switching the UPS from Normal to Maintenance
Bypass.
2. Close the external maintenance bypass rotary switch to Maint position.

!

WARNING

!

WARNING

On the primary input distribution panel, which is often located distant from the UPS area, a
label should be posted advising service personnel that the UPS circuit is under maintenance.

Wait 5 minutes for the internal DC busbar capacitors to discharge.

The UPS is now completely powered down.
NOTE
The maintenance bypass power switch may be operated at any time while the UPS is powered
down to connect the load to the maintenance bypass supply if required
The procedure can be performed only after the installation has been completed (which includes the
maintenance bypass cabinet), after the system has been placed in operation by authorized personnel.
See Figure 30 for more information.
Figure 30 Example of configuration for single UPS with external maintenance bypass cabinet.
CB1

SW

CB2

3P

49

Operating Procedures

6.6

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, inverter and stop powering the load immediately (including the
inverter and bypass), and the battery stops charging or discharging.
If the input utility is present, the UPS’s controls will remain active; however, the output will be
turned off. To remove all power from the UPS, the external feeder breaker should be opened.

6.7

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).
If the “Auto Recovery after EOD Enabling” feature is disabled, the user may restart the system manually by pressing “Fault Clear” button.

6.8

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.
2. Press the INVERTER ON button on the right side of the operator control panel for longer than
2 seconds.
NOTE
The rectifier will start again, and the bypass will begin to power the load (for units with
internal battery contactor installed, the battery contactor will close). 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.
NOTE
The rectifier will be turned On automatically when the overtemperature fault disappears at
5 minutes after the disappearance of overtemperature signals.

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 rotary switch (SW1) is in either Bypass or in Normal position,
the UPS will start up on Bypass. There will be power at the output terminals of the UPS.

!

WARNING

If the rotary switch is in the Maint. position and input utility is present, there will be power at
the output terminals of the UPS.

50

Operating Procedures

6.9

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 than the one being displayed:
1. From the main menu, press the F1 (shift) key to move the cursor to the menu at the top of the
screen.
2. Press F2 and F3 (left and right arrows) as needed to select the Language menu.
3. Press F1 (shift) to move the cursor to the data and settings area of the LCD.
4. Use F2 and F3 (up and down) to select the required language.
5. Press the F4 (enter) key to accept the language selection.
6. 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.

6.10

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

6.11

Command Password
Password protection is used to limit the control functions accessible to the operator. The default password is 12345. This password provides access to UPS and battery test functions.

51

Operating Procedures

6.12

Isolating One Module in a Multi-Module System
NOTE
The Multi-Module system must have at least one UPS module redundant in the system and
have an external output breaker installed with interlocking cables connected to the UPS
module. The inverter firmware in each UPS in the system must be I140 or greater.
1. With all UPS modules in the system in Normal mode, open the external output isolator.
NOTE
Opening the external output isolator under these condtions puts the UPS module into Standby
mode. This is indicated by a flashing inverter LED and the message “Check UPS output.”
An “Inverter asynchronous” alarm is also normal. The remaining UPS modules will remain on
line and “Parallel comm fail” will annunciate.
2. Press the UPS EPO to isolate the batteries.
3. Open the UPS door to gain access to the main power switches SW1 and CB1.
4. Turn the rotary switch (SW1) to the Bypass position then continue to rotate to Test.
NOTE
With the UPS external output breaker open and auxiliary switches closed the UPS control will
enable the UPS switch to be rotated through “Bypass” without initiating the remaining on line
UPS modules to transfer to Bypass.
5. Open rectifier input breaker CB1.

!

WARNING

Hazardous Battery Voltage
No operator serviceable parts are located behind covers that require a tool for their removal.
Only qualified service personnel are authorised to remove such covers.
The UPS battery and connecting terminals remains energized at hazardous voltage levels at
all times. The battery is located behind protective covers that require a tool for their removal:
inside the UPS cabinet, inside a free-standing battery cabinet or on open racks inside a
dedicated battery room that may be locked.

52

Operating Procedures

6.13

Inserting One Module into a Multi-Module System
This procedure is indicated to reintegrate 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 open.

WARNING

!

Mains voltage will be applied to UPS output terminals.
No operator serviceable parts are located behind covers that require a tool for their removal.
Only qualified service personnel are authorised to remove such covers.

1. Open the UPS door to gain access to the main power switches.
2. Rotate the switch to Test position. The LCD display becomes active.
3. Close the Input breaker CB1
The Rectifier indicator flashes on the UPS mimic panel during the startup of rectifier and
becomes steady green once the rectifier reaches normal operation state after about 30s.
4. Close external battery circuit breaker QF1 (where an external battery is used). This breaker is
located inside the battery cabinet (if used) or is otherwise adjacent to the battery racks
5. Following battery availability being detected by the UPS, the red battery indicator extinguishes
moments after when the battery charger starts operation.
6. Rotate switch to Bypass position
7. Turn the rotary switch to NORMAL.
8. Close external output power isolators.
9. Press the INVERTER ON control button for 2 seconds.
The inverter will startup and the inverter indicator will flash 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 becomes green.
10. Check that no “Warning” message is displayed in the top right corner of the LCD Monitor and the
status of the indicators as follows:
# 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.

53

Operator Control Panel and Display

7.0

OPERATOR CONTROL PANEL AND DISPLAY

7.1

Introduction
The operator control panel and display is located on the front door of the UPS. The panel is the access
point for operator control and monitoring of all measured parameters, UPS and battery status and of
event and alarm logs.

Figure 31 UPS control and display panel
The operator control panel is divided into three functional areas
Mimic Power Flow Chart

Graphic LCD monitor with menu keys
6

3

Status

1

4

5

Liebert NX
020kVA 3X3

2005-10-22
Single

Bypass

2

7

17:32:20
Normal

Output

L1-N/L2
L1-N/L2 voltage (V) 229.5
L-N current (A)
24.5
Frequency (Hz)
49.97
L-L voltage (V)
397.5
Power Factor
0.99
Rotary SW. normal pos.
Manual turn on
Normal mode

Direct Access keys

8

Load
L2-N/L3
229.5
24.5
49.97
397.5
1.00

07-07
07-07
07-07

L3-N/L1
229.5
24.5
49.97
397.5
0.99

EPO

INVERTER ON

INVERTER OFF

FAULT CLEAR

SILENCE ON /OFF

17:24
17:29
17:30

?
F1

Table 11

F2

F3

F4

HELP

UPS control and display panel components

Component #

Button

Function

Function

1

Rectifier (Input AC to DC)

EPO

Emergency Power Off button

2

Battery (DC Back-up)

Inverter ON

Inverter start button

3

Bypass Input

Inverter OFF

Inverter shutdown button

4

Inverter (DC to AC)

Fault Clear

Reset button

5

Load (AC Output)

Silence On/Off

Audible Alarm Mute

6

UPS Status and Alarm indicator

7

Audible Alarm (Buzzer)_

8

Emergency Power Off Button cover

—
F1-F4, Help

54

—

—
LCD Menu keys
—

Operator Control Panel and Display

7.1.1

Mimic Power Flow
The LEDs mounted on the mimic flow chart represent the various power paths and current UPS operational status.
Table 12
Green

Rectifier in Normal Operation

Flashing
Green

Input AC Normal, but rectifier not operating

Red

Rectifier Failed

Off

Rectifier Not operating, Input AC Not Available or out of normal range

Table 13

Battery indicator—2

Green

Battery Normal, but discharging and powering the load

Flashing
Green

Battery End of Discharge pre-warning

Red

Battery abnormal (Failed, Absent or Polarity Reversed) or Battery
Converter abnormal
(Failed, overcurrent, overtemperature)

Off

Battery and Converter Normal, Battery charging.

Table 14

Bypass indicator—3

Green

Load on Bypass power

Red

Bypass not available, out of normal range or Static bypass switch fault.

Off

Bypass Normal, load not on bypass

Table 15

Inverter indicator—4

Green

Inverter Normal and powering the load

Flashing
Green

Inverter ON, starting up, synchronising,
or standing by (ECO mode)

Red

Inverter failed

Off

Inverter not operating

Table 16

Load indicator—5

Green

UPS output ON and Normal

Red

UPS output ON and Overloaded

Off

UPS output OFF.

Table 17

7.1.2

Rectifier indicator—1

Status (Alarm) indicator—6

Green

Normal Operation

Yellow

UPS Warning e.g. AC Input Failure

Red

UPS fault e.g. Fuse or Hardware failure

Audible Alarm (Buzzer)
UPS activity is accompanied by the following sounds
Table 18

Audible alarm key

Single beep

Direct Access key acknowledgement

One beep
per second

UPS Warning e.g. AC Input Failure

Continuous
beep

Fault e.g. Fuse or Hardware failure

55

Operator Control Panel and Display

7.1.3

Direct Access Push Buttons (Keys)
Emergency Power Off (EPO)

Disconnects Power to the Load. Disables rectifier, inverter, static bypass
and battery operation.

Inverter ON

Enables Inverter Operation

Inverter OFF

Disables Inverter Operation

Fault clear

Resets blocked UPS functions (subject to any fault being cleared)

Silence ON/OFF

Toggle type buzzer mute. Any new fault re-enables the buzzer.

Press and hold Direct Access key briefly until acknowledged by a single beep.

7.1.4

LCD Monitor and Menu keys
The user-friendly and menu-driven 320 x 240 dot graphic LCD monitor displays real time data and at
the same time stores 512 historical records that can retrieve for reference and diagnosis.
The user can perform commands or easily browse through the input, output, load and battery parameters. For quick reference, the UPS status and any warnings are always highlighted without the need
of navigating through the menu. The versions of converter firmware, inverter firmware and internal
monitor firmware can also be displayed on the LCD.
Menu keys F1 to F4 are used to navigate within the graphic LCD monitor windows.
Table 19

Menu key Icons and their meaning

Key

F1

F2

F3

F4

Help

?

Window Type 1
LEFT

RIGHT

UP

DOWN

ENTER

Next Data Window

Window Type 2

HELP

ESC
Escape

Figure 32 Graphic LCD monitor windows and keypad

Liebert NX
20kVA 3X3

2005-10-22
Unit #1
Bypass

Main

A(AB)
220
20.5
50.1
380
0.99

Vphase V
Iphase A
Freq. Hz
Vline V
P.F.

Input breaker closed
Manual turn on
UPS in normal mode

17:32:20
Normal
Output
B(BC)
220
20.5
50.1
380
0.99

C(CA)
220
20.5
50.1
380
0.99

01-12 12:28:16
01-12 12:30:06
01-22 12:30:16

?
F1

F2

F3

56

F4

HELP

1 - UPS System
Window
2 - UPS Menu
Window
3 - UPS Data
Window

4 - Current Record
Window
5 - Keypad Window

Operator Control Panel and Display

The function of keys F1 to F4 is shown by a self-explanatory icon as appropriate for the particular
window. As shown in Figure 32 above, pressing F1 moves the cursor (resting in “OUTPUT”) from the
UPS Menu Window (2) to current record window (4) where it would first rest in “Input breaker closed’.
In a similar manner, pressing F2 would move the cursor from the Output data window to the Bypass
data window.
The summary menu tree is shown below. Refer to 7.2 - All Status and Event Messages Displayed
on the UPS Front Panel for a detailed description of each menu item.
Figure 33 Menu tree
Mains (input)

TX Input *

Bypass

Output

TX Output **

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

L-N voltage (V)
L-L voltage (V)

L-N voltage (V)
Frequency (Hz)
L-L voltage (V)

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

L-N voltage (V)
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 capacity (%)
Battery boost charging
Battery float charging
Battery disconnected

(history log)

Language

Settings

Command

Version

(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

Battery maintenance test
Battery capacity test
System test
Stop testing

UPS version
UPS model

Freshening Charge
Stop Freshening
Charge
* 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.

57

Operator Control Panel and Display

7.1.5

Detailed Description of Menu Items
The description that follows refers to the graphic LCD monitor window shown on Figure 32.
UPS System Window: This fixed-pane window displays current time and date and identifies the UPS,
its configuration and its status.
Table 20

UPS system window

Description

Explanation

Liebert NX

UPS family name

2005-10-22

YYYY-MM-DD (see Settings menu for other date formats)

12:30:36

Current Time (24 hr HH:MM:SS format)

30kVA-3x3

30kVA = UPS rated output, 3 x 3 = 3-phase input and output

(Configuration)

Single = single double-conversion unit
ECO = single stand-by unit with double-conversion fall-back
Master = master in a 1+1 Hot Stand By system
Slave = slave in a 1+1 Hot Stand By system
Unit # 1 = of max 6 double-conversion units in a parallel system

Single, ECO, Master, Slave or Unit # 1

(Status)
Normal, Warning or Fault

Normal = UPS operating Normal
Warning = System attention required, e.g. AC Input Failure
Fault = UPS Fuse or Hardware Failure

Menu and Data Window
Use the horizontal arrow keys to navigate between any of the selectable menu and data windows.
Table 21
Menu
Type

Mains
(input)

TX Input

Bypass

Output

TX Output

Load

Descriptions of UPS menus and data window items
Item Type

Explanation

L-N voltage (V)

Phase voltage

L-N current (A)

Phase current

Frequency (Hz)

Input frequency

L-L voltage (v

Line-line voltage

Power factor

Power factor

L-N voltage (V)

Phase voltage

L-L voltage (V)

Line-line voltage

L-N voltage (V)

Phase voltage

Frequency (Hz)

Bypass frequency

L-L voltage (A)

Line-line voltage

L-N voltage (V)

Phase voltage

L-N current (A)

Phase current

Frequency (Hz)

Input frequency

L-L voltage (V)

Line-line voltage

Power factor

Power factor

L-N voltage (V)

Phase voltage

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

58

Operator Control Panel and Display

Table 21
Menu
Type

System

Battery

Records
Language

Settings

Command
(start/stop
battery &
system
tests)

Version

Descriptions of UPS menus and data window items (continued)
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

(history log)

Displays all records in the history log

(choices for text displayed) User may select any of 12 languages for LCD text.
Display contrast

Adjust the LCD display contrast

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 Intellislot 1

Comm2 baud rate

Communication baud rate setting for Intellislot 2

Comm3 baud rate

Communication baud rate setting for Intellislot 3

Communication address

This setting is applicable to RS485 communication mode

Communication mode

Communication Mode Setting

Callback times

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

Phone No.2

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

Phone No.3

When 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.

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 100%.

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 100%.

System test

This is a self-test of the UPS. When the user activates this function, a popup 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

This command will allow a temporary Equalize charge for the batteries.
This charge is configurable for 1 to 36 hours

Stop Freshening Charge

Manually stop a Freshening Charge

UPS version

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

UPS model

Provides UPS model information—for example, 400V-50Hz.

59

Operator Control Panel and Display

Current Record Window
Keeps a log the events that resulted in the current mode of operation. Ignores transient conditions
that have been resolved.
Use “page” (F1) and up / down arrow to read the events.
For a complete history log, refer to the Records tab of the Menu and Data Window.
Refer to Table 22 for a complete list of supported status messages.

7.2

All Status and Event Messages Displayed on the UPS Front Panel
This is the complete list of UPS events and status messages supported for display in either the Record
window (Historic data) or in the Current window (Prevailing data) as described in 7.1.4 - LCD Monitor and Menu keys.

Table 22

UPS messages

Message

Description / Suggested Action (if any)

Inverter Comm. Fail

Internal RS485 communication failure between monitor and inverter

Rectifier Comm. Fail

Internal RS485 communication failure between monitor and rectifier

Parallel Comm. Fail

The CAN communication between different UPSs within a parallel system fails.
1.Check if there are some UPSs not powered on in the parallel system. If so, power on these
UPSs and check if the alarm disappears.
2. Press Fault Clear push button.

Battery Overtemp.

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

Ambient Overtemp.

The Ambient temperature is over limit. Check the ventilation of UPS room.

Battery Fault

Battery detected faulty (Reserved)

Replace Battery

Battery test failed, Battery should be replaced.

Battery Low Pre-warning

Before the end of discharge, battery undervoltage 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.

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-neutral voltage amplitude of rectifier.

Mains Undervoltage

Mains Voltage is undervoltage 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

Rectifier detected faulty. Rectifier shuts down. Battery discharges.

Rectifier Overtemp.

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

Batt. Contactor Fail

Battery contactor or circuit breaker not responding to control signals.

Batt. Charger Fault

The voltage of the battery charger is too high.

Control Power 1 Fail

UPS operates but Redundant Control Power is not available.

Mains Phase Reversed

AC Input phase sequence is reversed.

Rectifier Overcurrent

Rectifier is overloaded.

Soft Start Fail

Rectifier could not start due to low DC bus voltage

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.
1. 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.
2. 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.
60

Operator Control Panel and Display

Table 22

UPS messages (continued)

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 if there are some relevant alarms such as “Bypass disconnect open”, “Bypass phase
reverse” and “Mains neutral lost”. If they appear, solve them first.
1. 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.
2. 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 changed a little larger
through the configuration software according to the customer’s agreement.

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 is no longer true.
1. First check if the alarm “Bypass unable to trace” or “Bypass abnormal” occurs. If so, solve it
first.
2. Verify the waveform of the bypass voltage. If it is too distorted, ask the customer to verify and
seek any possible measurements.

Inverter Fault

Inverter output voltage beyond limits. Load transfers to bypass.

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:
1. high ambient air temperature.
2. blocked cooling airway.
3. any fan failure.
4. prolonged inverter overload

Fan Fault

At least one of the cooling fans has failed

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.

Bypass STS Fail

At least one of the static switches of bypass side is open or short circuit. This fault is locked until
power off

Operation Invalid

This record is registered following an incorrect operation:

Output Fuse Fail

At least one of the inverter output fuses is blown. Inverter shuts down. Load transfers to bypass.

Control Power 2 Fail

UPS operates but Redundant Control Power is not available.

Unit Over load

The UPS is confirmed to be overload when the load arises above 105% nominal rating.
The alarm automatically resets once the overload condition is removed.
1. Confirm that the alarm is true by checking the load percent indicated on the LCD panel to
determine which phase is being overloaded.
2. 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.

System Over load

The UPS parallel system is confirmed to overload when the total load arises above 105%
nominal rating for the set basic number of UPSs. The alarm automatically resets once the
overload condition is removed.
1. Confirm that the alarm is true by checking the system load percent indicated on the LCD
panel to determine which phase is being overloaded.
2. 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.

61

Operator Control Panel and Display

Table 22

UPS messages (continued)

Message

Description / Suggested Action (if any)

Unit Over load Timeout

The UPS is confirmed to overload 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 10 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).

Byp. Abnormal Shutdown

Both bypass and inverter voltages unavailable. Load interruption

Inverter Over Current

Inverter Pulse Width Modulation module overloaded.

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

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 Time-out

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 modules within a parallel system are not sharing the load current equally.

DC Bus Abnormal

DC input voltage to inverter beyond limits. Inverter shuts down. Load transfers to bypass.

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

Malfunction of the paralleling control circuits of this UPS module. Can cause “System Transfer”
to bypass.

DC Bus Over Voltage

Rectifier, inverter and battery converter were shutdown because DC bus voltage is too high.
Check whether there is a fault in rectifier side. If no, then check whether overload occurs.
Restart the inverter after resetting the fault

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.

Bypass Over Current

Bypass current is over limit above 135% rating. The UPS just alarms and does nothing.

LBS Active

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

Setting Save Error

History records not saved. (Reserved)

Mains Neutral Lost

AC Input mains reference neutral not detected.

Protocol version clash

Firmware incompatibility between Monitor Board and Digital Signal Processor Board.

Battery ground fault

Battery leakage to ground detected (option)

Inv. Turned On Manually

Manual Turn On via front panel

Inv. Turned Off Manually

Manual Turn Off via front panel

EPO

Emergency Power Off direct access key pressed or external command received

Transfer Confirm

Prompt to press “enter” key to acknowledge that an interrupted load transfer to bypass will
happen.

Transfer Cancel

Prompt to press “ESC” key to avoid that an interrupted load transfer to bypass will happen.

Unit Off Confirm

Prompt to press “enter” key to acknowledge that the UPS will be disconnected from other
paralleled UPS modules.

System Off Confirm

Prompt to press “enter” key to acknowledge that the all paralleled UPS will be disconnected
from the load.

62

Operator Control Panel and Display

Table 22

UPS messages (continued)

Message

Description / Suggested Action (if any)

Fault Reset

Fault clear direct access key pressed

Alarm Silence

Silence On/Off direct access key pressed

Turn On Fail

Inverter failed to turn on when Inverter On direct access key was pressed. This may be as a
result of Invalid Operation (Maintenance bypass on) or DC bus or rectifier not ready.

Alarm Reset

Fault clear or Silence On/Off direct access key pressed

Bypass Mode

Load supplied from AC input bypass supply.

Normal Mode

Load supplied from Inverter output through double conversion of the AC mains input supply.

Battery Mode

Load supplied from Inverter output through double conversion of the Battery supply.

Source share mode

Load supplied from Inverter output through shared double conversion of the AC mains input
supply and of the Battery supply.

UPS Shutdown

UPS Shutdown, output power-down

Check UPS Output

Inverter off during normal startup (diagnostics information only)

Generator Connected

Generator active signal received. Source share mode may be activated pending UPS settings.

BCB open

Battery Circuit Breaker status (open)

BCB closed

Battery Circuit Breaker status (closed)

Battery Float Charging

Battery status (Float charge mode)

Battery Boost Charging

Battery status (Boost charge mode)

Battery Discharging

Battery status (discharge mode)

Battery Period Testing

Automatic periodic battery maintenance discharge test (20% capacity discharge)

Batt. Capacity Testing

User initiated battery capacity discharge test (100% capacity discharge)

Batt. Maint. Testing

User initiated maintenance discharge test (20% capacity discharge)

UPS System Testing

User initiated UPS self test

Inverter in Setting

Inverter starting up and synchronising

Rectifier in Setting

Rectifier starting up and synchronising

MBP-T cabinet Fan Fault

Maintenance bypass cabinet fans fault.

Ext Input TX Overtemp

External Input Isolation Transformer Over Temperature

Ext Output TX Overtemp

External Output Isolation Transformer Over Temperature

Battery Room Alarm

Environment in Battery Room Needs Attention

Rotary Sw. Test Pos.

Rotary switch is in test position.

Rotary Sw. Normal Pos.

Rotary switch is in normal position.

Rotary Sw. Bypass Pos.

Rotary switch is in bypass position.

Rotary Sw. Maint. Pos.

Rotary switch is in maintenance position.

Battery Contactor Open

Battery Contactor Open

Battery Contactor Close

Battery Contactor 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 UPS was shutdown at EOD, inverter auto starts when utility restore

Rec. Flash Update

Rectifier firmware is being update

Inv. Flash Update

Inverter firmware is being update

Monitor Flash Update

Monitor firmware is being update

Input contactor fault

Input contactor is in fault

Contactor P.S. 1 fault

Contactor Power Supply board 1 Fault

Contactor P.S. 2 fault

Contactor Power Supply board 2 Fault

LBS abnormal

LBS is abnormal

DSP firmware error

The inverter firmware does not match with the rectifier firmware.
63

Operator Control Panel and Display

7.3

Prompt (Pop-Up) Windows
The prompt window is displayed during the operation of the system to alert the user to certain conditions and / or to require user confirmation of a command.
Table 23

7.4

Prompt windows, meanings

Prompt

Meaning

Transfer with interrupt, please confirm or cancel

Inverter and Bypass supplies are not synchronised and
any load transfer between the supplies will cause a brief
load interruption.

The load is too high to be transferred with interrupt

The total load must be less than the capacity of one unit
to allow a parallel system to perform an interrupted
transfer from bypass to inverter.

This Operation Leads to Output Shutdown, Confirm or
Cancel

No alternative supply is available and any Inverter Off
operation will cause the load to be de-energised.

This operation leads to inverter overload, confirm or
cancel

The turn-off this inverter will lead to the overload of
remaining inverter(s) in a parallel system.

Turn on more UPS to carry current load

The number of paralleled inverters already turned on is
insufficient to carry the existing load.

Battery will be depleted, confirm

Battery Capacity test discharges the battery 100%

System self test finished - everything is ok.

No action required

System self test finished - Please check the current
warnings.

Check “Current Records” window

Enter control password

Required for Battery or UPS test (default = 12345)

Battery Self Test aborted, condition not met

Battery self-test condition is not enough. User should
check whether battery state is boost charging and
whether load level is greater than 20 percent.

Battery Refresh Charge aborted, condition not met

Boost charging condition is not enough, such as (No
battery, charger has failed, etc.).

Dynamic Energy Flow Chart and UPS Help Screen
This screen displays a mimic diagram of the UPS that includes energy flow and status of isolation and
transfer switches. Press the “Help” key to activate this screen. Press again to toggle between this
screen and the main screen.

Figure 34 Help screen

Help information
Select the current record window
Select the previous menu item

Press help key back to main menu

F1

F2

F3

64

F4

HELP

Operator Control Panel and Display

7.5

Default Screen Saver
This default screen is displayed following at least 2 minutes of operation with no new alarm. After
another delay, the backlight turns off. Press any key (F1-F4 or Help) to reactivate the screen.

Figure 35 Default screen

Liebert NX
20 kVA-3x3

2005-05-22
UNIT #1

12:30:36
NORMAL

Press any key, back to main menu

F1

F2

F3

65

F4

HELP

Options—For Assembly Inside the UPS Cabinet

8.0

OPTIONS—FOR ASSEMBLY INSIDE THE UPS CABINET
Several items of optional equipment are available for connection to the Liebert NX UPS. These are
described in this section of the manual and should be fitted prior to installation.

8.1

Protection

8.1.1

Battery Ground Fault Detection
In addition to any residual current device mounted externally and upstream the UPS or when
optional isolation transformers are fitted to the UPS, an optional residual battery current device can
be fitted to detect leakage current from the battery into the PE (Protective Earth) Residual current
range monitored: 30~3000mA.
Power supply voltage for the set: AC230V (L-N);
When a battery ground fault is detected, an alarm will appear on the UPS display panel.
An additional Dry contact fault Alarm signal is available for remote monitoring:
Table 24
Terminal
21

Dry contact fault alarm signal is available for remote monitoring
Name

Definition

Common

Battery Ground Fault Detection – can be
programmed as Alarm or Pre-Alarm

22

NC

24

NO

The Battery ground fault detection set contains one CT (current transformer) and one DC sensitive
residual current monitor. The connection of this set for UPS is illustrated as follows.
Figure 36 Battery ground fault detection set connections

Current Transformer
W1-A358 (installed
externally only )

Battery

BCB or
Contactor

Batt +
Batt-N
Batt -

Socket

Output
Phase

Output
Neutral

X

X

K1

K2

I2

Monitor Board
-U2

I2

A1

11

4 +12V

A2

14

2

Battery Ground
Fault Detection
Resys B470
(AC230)

66

IN DRY-X3

BtG
UPS

Options—For Assembly Inside the UPS Cabinet

8.1.2

Redundant Fan for Power Module
In addition, to ensure sufficient cooling power at various operation modes with 100% rated load, a
redundant power module fan set can be supplied, thus ensuring continuity of UPS operation even
with the failure of some fans. No extra footprint is required.

Figure 37 Redundant power module fan set
Redundant AC Fan
(AC Fan 1-1)

(AC Fan 1-2)

(AC Fan 1-3)

Standard AC Fan
(AC Fan 1-4)

Fan120

Fan120

Fan120

Fan120

TOP VIEW
Figure 38 Communication bays and cable location
Location

Preferred Device This Location

RS-232-1 DB-9 (COM Port 1) - Serial MultiLink Software
(Port Setting 2400 Baud)
RS-232-2 DB-9 (COM Port 2 - Service Access Software
(Port Setting 9600 Baud)

DB-9
Monitor
Board

Location

Preferred Device This Location

Top Bay
Mid Bay
Bottom Bay

Relay Card (no port setting required)
Multiport4 (no port setting required)
OCWeb LB / OC485 (port setting 2400 Baud)

Top
Mid
Bottom

Gland plate for cable exit

Suggested routing of customer-supplied
communication cables
Notes:
a) All Intellislot cards are supported in any bay.
b) Port sharing is:
- PERMITTED between RS232-x DB9 devices and Relay /
Multiport4 Intellislot cards (i.e., Serial Multilink software
will work from RS232-1 DB9 also when relay card is
inserted in the top bay.
- NOT PERMITTED between RS-232-x D-B9 devices and
OCWeb / OC485 cards (i.e., Serial MultiLink software will
not work from RS232-1 DB-9 when OCWeb card is inserted
in the top bay.

67

Options—For Assembly Inside the UPS Cabinet

8.1.3

OC 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 network and in addition the same card will also transmit the
same status information and all measured parameters for display via a Web browser.
This card is supported in the top, middle and bottom Intellislot bays.

Figure 39 OC Web Card data summary window

Figure 40 OC Web Card battery data summary

68

Options—For Assembly Inside the UPS Cabinet

8.1.4

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/VDC at 1A and supported in any of the three NX Intellislot bays.
Table 25

Relay Card pin configuration

Pin

Function

Operation
Closed if no UPS failure

1

UPS Fault

2-3

Not Used

4

UPS Fault

Closed if UPS fails

5

Summary Alarm**

Closed if SUMMARY ALARM** occurs

6

Summary Alarm**

Closed if no alarm conditions are present

7

Any Mode Shutdown return

Not Supported– use External EPO terminal

8

Not Used

9

Common - Low Battery

10

Low Battery

Closed if battery is OK

11

Low Battery

Closed if LOW BATTERY point occurs.

12-13

Not Used

14

UPS Any Mode Shutdown

15

On UPS

Closed if ON UPS (inverter) power

16

On Battery

Closed if ON BATTERY power (Utility failure)

17

Common - UPS Fault, Summary Alarm,
On UPS, On Battery, On Bypass

18

On Battery

19 ÷ 23

Not supported– use External EPO terminal

Closed if not ON Battery power (Utility OK)

Not Used

24

On Bypass

25

Not Used

Closed if ON BYPASS

**A Summary Alarm occurs when any of the following conditions exist:
•
•
•
•

Utility power is out of the acceptable range (voltage and/or frequency)
UPS is in BYPASS MODE (load not on Inverter power)
UPS Battery is LOW
UPS fault has occurred

Table 26
#

8.1.5

Relay card jumpers

Connection

Description

JP01

Pin 9 to Pin 17

Allows all relay COMMONS to be tied together.

JP02

Pin 7 to Pin 17

Irrelevant for NX - (Interconnects all relay COMMONS and the (not
supported) ANY MODE SHUTDOWN Return.

Multiport-4 Card
The Multiport-4 card provides 4 sets of voltage-free contact closures for remote monitoring of alarm
conditions UPS operation On Battery and battery low condition. A typical application is to allows 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 NX Intellislot bays.

69

Options—For Assembly Inside the UPS Cabinet

Figure 41 SiteNet MultiPort4 Intellislot pin configuration
CPU

CPU

UPS
CPU

CPU

Table 27
Pin

SiteNet MultiPort4 Intellislot pin assignment
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

70

Options—For Assembly Inside the UPS Cabinet

8.2

OC485 Web Card – Modbus, Jbus, IGM Net
The OpenComms 485 Card facilitates SiteScan Web or Building Management Systems monitoring.
The RS232 port is used for connection to a personal computer for setting up.
The RS-485 port supports IGM Net and Modbus/JBus protocols and maps the operation of the UPS
including status, alarms and data (voltages, currents, frequency, power, power factor, temperatures
etc.)

Figure 42 OC485 Web card

Table 28

NX communication options

Physical
description
of port

Top
Intellislot

Labeled
ID Name
of Port

Intellislot 2
(On Monitor Board)

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

Comm 1

Monitoring
Devices
supported
Multiport 4

any

Relaycard-int

any

OCWEB-LB
Modbus/Jbus

Middle
Intellislot

Intellislot 1
(On Monitor Board)

Comm 2

Relaycard-int

any

OCWEB-LB

8.2.1

Comm 3

Top
DB9 port

RS232-1

Comm 1

Bottom
DB9 port

RS232-2

Comm 2

2400

Not simultaneous with
Multilink in RS232-2

any
any

OCWEB-LB

2400

Modbus/Jbus

2400

Service Software
(Reserved)

Not simultaneous with
Multilink in RS232-1

2400

Relaycard-int

Multilink Serial

Comments

2400
any

Multiport 4
Intellislot 3
(On Monitor Board)

2400

Multiport 4

Modbus/Jbus
Bottom
Intellislot

Baud
rate

9600

Not simultaneous with Web
card in top Intellislot.

9600

Not simultaneous with Web
card in middle Intellislot.

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

71

Options—For Assembly Inside the UPS Cabinet

8.2.2

Dust Filter for 10-30kVA
Installing the two dust filters in the Liebert NX requires only a Phillips screwdriver. Each filter is
held in place by a bracket on either side of each filter. To install each filter:
1. Open the UPS door and locate the filters (on the back side of the front door; see Figure 43).
2. Remove one bracket and loosen the screw on the second bracket. The second bracket need not be
removed (see Figure 43).
3. Remove the dust filter to be replaced.
4. Insert the clean filter.
5. Reinstall the bracket, tightening the screw securely.
6. Tighten the screw on the second bracket.

Figure 43 Dust filter replacement

Bracket
Sems screw

72

Bracket

Technical Specifications

9.0

TECHNICAL SPECIFICATIONS

9.1

Conformity and Standards
The UPS has been designed to conform to the following European and international standards:
Table 29

Compliance with European, international standards

Description

Normative reference

General and safety requirements for UPS used in
operator access areas

EN 50091-1-1 /IEC 62040-1-1 / AS 62040-1-1

Electromagnetic compatibility (EMC) requirements for
UPS

EN 50091-2 / IEC 62040-2 / AS 62040-2 (Class A)

Method of specifying the performance and test
requirements of UPS

EN 50091-3 / IEC 62040-3 / AS 62040-3 (VFI SS 111)

The product standards in Table 29 incorporate relevant compliance clauses with generic IEC and EN
standards for safety (IEC/EN/AS60950), electromagnetic emission and immunity (IEC/EN/AS61000
series) and construction (IEC/EN/AS60146 series and 60529).
Table 30

Environmental characteristics
Unit of
Measurement

10

15

20

30

Acoustic Noise Level at 1 Meter (39 in)

dBa

51.0

51.5

51.6

56

Altitude of Operation

m (ft)

≤1000m (3280 ft) above sea level
de-rate power by 1% per 100m(328 ft) between
1000 and 2000 m (3280 and 6560 ft)

-

0 to 95% non condensing

Operating Temperature

°C (°F)

0 to 40 (32-104°)
Battery life is halved for every 10° (18°) increase
above 20° (68°)

Storage-Transport Temperature for UPS

°C (°F)

-20 to 70 (-4 to 158)

Recommended Battery Storage
Temperature

°C (°F)

-20 to 30 (-4 to 86)°F)
(20°C [68°F] for optimum battery storage)

Rated power, kVA

Relative Humidity

Table 31

Overall efficiency, heat losses and air exchange
Unit of
Measurement

10

15

20

30

Normal Mode (dual conversion)

%

90.4

91.2

91.3

91.9

ECO Mode

%

93.2

94.2

94.7

96.6

Rated Power,

kVA

10

15

20

30

Battery Mode

%

91.3

91.7

92.0

92.5

Rated Power

kVA

10

15

20

30

Normal Mode

kW

1.6

1.8

2.2

2.6

ECO Mode

kW

1.3

1.4

1.4

1.5

No Load

kW

1.3

1.3

1.3

1.3

L/sec (m3/hr)

119
(428)

Rated Power, kVA

Inverter Efficiency (DC/AC)
(battery at nominal voltage 480VDC and full-rated linear load)

Heat Loss & Air Exchange (Ventilation)

Maximum Forced Air Cooling (front intake, back exhaust)
Input and output voltage 400VAC, battery charged, full rated linear load

73

239 (860)

Technical Specifications

Table 32

Mechanical characteristics

Rated Power, kVA
Dimensions, WxDxH

Unit of
Measurement

10

15

20

30

600x700x1400
(23-9/16x27-5/8x55)

mm (in)

Mass
Mass without batteries

kg (lb)

180 (397)

204 (450)

204 (450)

210 (463)

Finish

N/A

Pantone 877 (Silver grey)
equivalent Becker Silver epoxy polyester powder 041-37-2

Protection Degree, IEC (60529)

N/A

IP20 (finger-proof with front doors open or closed)

Table 33

Rectifier AC input (mains)

Rated Power, kVA

Unit of
Measurement

10

15

20

30

Rated AC Input Voltage 1

VAC

380/400/415
(3-phase and sharing neutral with the bypass input)

Input Voltage Tolerance 2

VAC

305V to 477V
304V to 208V (output derated below 70%)

Hz

50/60Hz (tolerance 40Hz to 70Hz)

Power Factor

kW/kVA, full
load
(half load)

0.99 (0.98)

Input Power

kVA rated 3
(maximum 4)

8.9 (11.7)

13.3 (18.9)

17.8 (23.3)

26.6 (35.0)

Input Current

A rated 3
(maximum 4)

12.9 (16.9)

19.3 (27.4)

25.8 (33.8)

38.6 (50.7)

THDI % FL

3

3

3

3

Frequency 2

Harmonic Current Distortion
Duration of Progressive
Power Walk-In

10 seconds to reach full rated current
(selectable 5 through 30 seconds in 5-second intervals)

sec

1. Rectifier operates at any of the rated supply voltages and frequencies without further adjustment.
2. At 305V input mains the UPS maintains the specified output voltage at rated load without discharging a previously charged
battery
3. IEC 62040-3 / EN 50091-3: at rated load and input voltage 400V, battery charged
4. IEC 62040-3 / EN 50091-3: at rated load and input voltage 400V, battery charging at maximum rated power.

74

Technical Specifications

Table 34

Battery
Intermediate DC Circuit

Rated Power,
Unit of
kVA
Measurement
Battery Bus
VDC
Voltage
Number of Lead-Acid Cells
Nominal
Maximum
Float Voltage

10

15
20
Nominal: 480V (VRLA Float charge is 540V)
Range: 400V - 616V

30

240 = [40 x 6-cell (12V) blocks]
264 = [44 x 6-cell (12V) blocks]
2.25 V/cell (selectable from 2.2 –2.3V/cell)
Constant current and constant voltage (IU) charge mode

V/cell (VRLA)

Temperature
Compensation
Ripple Voltage
Ripple Current

mV/°C/cl

- 3.0 (selectable 0 to – 5.0 around 25°C or 30°C. or inhibit)

% V float
% C10

Boost Voltage

V/cell (VRLA)

≤1
≤5
2.35 V/cell (selectable from 2.30-2.40V/cell)
Constant current and constant voltage (IU) charge mode
- float-boost current trigger 0.050 C10 (selectable 0.030-0.070)
- boost-float current trigger 0.010 C10 (selectable 0.005-0.025) with
24 hr safety timeout (selectable 8-30 hr)
- boost mode inhibit also selectable
1.63 V/cell (selectable from 1.60~1.75 V/cell
Auto Inverse EOD voltage x discharge current mode
(The end of discharge voltage increases at low discharge currents).
2.4 V/cell (selectable from 2.3-2.4V/cell)
Constant current and constant voltage (IU) charge mode
Programmable auto trigger or inhibit of boost mode

Boost Control
End Of
Discharge

V/cell (VRLA)

Battery Charge
Battery
Charging Power*
max current
(adjustable) 1

V/cell
kW

2.5

5

5

7.5

A

3.75

7.5

7.5

12

* At low input voltage the UPS recharge capability increases with load decrease (up to the maximum capacity indicated)
1. Max currents listed are for EOD voltage of 1.67 V/cell for 240 cells.

Table 35

Inverter output to critical load

Rated Power, kVA (kW)

Unit of
Measurement

Overload

% Rated

Fault Current
Non linear load capability 3
Neutral current capability
Steady state voltage stability
Transient voltage response 4
Total Harmonic Voltage
Distortion (THDV)
Synchronisation - Window

% Rated
% Rated
% Rated
%
%

10 (8)
15 (12)
20 (16)
30 (24)
380/400/415 V (three-phase, four-wire with neutral
referenced to the bypass neutral)
50 / 60
110% for 60 min
125% for 10 min
150% for 1 min
>150% for 200 msec
340% current limitation for 200 msec
100%
170%
±1 (balanced load), ±2 (100% unbalanced load),
±5

%

< 1 (linear load), < 4 (non linear load 3)

Hz sec

Rated frequency ± 2Hz (selectable ± 0.5 to ± 3Hz)
1 Hz/sec
selectable 0.1 to 3Hz/s (single UPS)
0.2Hz/sec (paralleled UPS)
±5

Rated AC Voltage 1
Frequency

2

Slew Rate (Max change rate
of synch frequency)
Inverter Voltage Tolerance
1.
2.
3.
4.

VAC
Hz

%V (AC)

Factory set to 400V – 380 or 415V selectable by commissioning engineer.
Factory set to 50Hz; 60 Hz selectable by commissioning engineer. Frequency converter operation also selectable.
EN 50091-3 (1.4.58) crest factor 3:1
IEC 62040-3 / EN 50091-3 also for 0-100-0% load transient. Transient recovery time: return to within 5% of steady state
output voltage within half a cycle.

75

Technical Specifications

Table 36

Bypass mains input

Rated power, kVA

Unit of
Measurement

Rated AC Voltage 1

VAC

10

15

20

30

380/400/415 V
three-phase four-wire, sharing neutral with the rectifier input
and providing neutral reference to the output

Rated Current
380V
400V
415V
Overload Capacity
Upstream Protection,
Bypass Line (by others)
Current Rating of Neutral Cable
Frequency 2
Transfer Time (between
bypass and inverter)
Bypass Voltage Tolerance
Bypass Frequency Tolerance
Synchronisation - Window

A
A
A
%
N/A
A
Hz
ms

% VAC
%
Hz

15
15
14

23
30
45
22
29
43
21
28
42
135% long term
170% 10 min
1000% 100 ms
Thermomagnetic circuit breaker, rated up to 125%
of nominal output current. IEC 60947-2 curve C.
1.7 x In
50 / 60
Synchronous transfer: ≤1ms
Asynchronous transfer (default): 15 ms (50 Hz), 13.3 ms (60 Hz)
or 40, 60, 80, 100 ms, selectable
Upper limit: +10, +15 or +20, default +15
Lower limit –10, -20, -30 or -40, default: -20
(delay time to accept steady bypass voltage: 10 sec)
± 2.5 ± 5 ± 10 or ± 20 default ±10
Rated frequency ±2Hz (selectable ± 0.5 to ±3Hz)

1. Factory set to 400V – 380 or 415V selectable by commissioning engineer.
2. Factory set to 50Hz; 60 Hz selectable by commissioning engineer. Bypass condition ignored when UPS set as frequency converter.

76

Technical Specifications

NOTES

77

Technical Specifications

78

Ensuring The High Availability
0f Mission-Critical Data And Applications.

Emerson Network Power, the global leader in enabling business-critical
continuity, ensures network resiliency and adaptability through
a family of technologies—including Liebert power and cooling
technologies—that protect and support business-critical systems.
Liebert solutions employ an adaptive architecture that responds
to changes in criticality, density and capacity. Enterprises benefit
from greater IT system availability, operational flexibility and
reduced capital equipment and operating costs.

Technical Support / Service
Web Site
www.liebert.com
Monitoring
800-222-5877
monitoring@liebert.com
Outside the US: 614-841-6755
Single-Phase UPS
800-222-5877
upstech@liebert.com
Outside the US: 614-841-6755
Three-Phase UPS
800-543-2378
powertech@liebert.com
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
7/F, Dah Sing Financial Centre
108 Gloucester Road, Wanchai
Hong Kong
852 2572220
Fax: 852 28029250

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.
© 2006 Liebert Corporation
All rights reserved throughout the world. Specifications subject to change
without notice.
® Liebert and the Liebert logo are registered trademarks of Liebert
Corporation. All names referred to are trademarks
or registered trademarks of their respective owners.

SL-25410_REV2_08-06

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

Integrated Cabinet Solutions

EmersonNetworkPower.com
Outside Plant
Services
Power Switching & Control
Site Monitoring
Precision Cooling

Surge Protection

Business-Critical Continuity, Emerson Network Power and the Emerson Network Power logo are trademarks and service marks of Emerson Electric Co.
©2006 Emerson Electric Co.



---

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