Liebert Emerson Nx Ups System Users Manual

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

: Liebert Liebert-Emerson-Nx-Ups-System-Users-Manual-571371 liebert-emerson-nx-ups-system-users-manual-571371 liebert pdf

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AC Power

For Business-Critical Continuity

Liebert NX UPS

User Manual–10-30kVA, 400V, 50/60Hz

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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 UPS Room . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

1.3.2 External Battery Room . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

1.3.3 Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

1.4 Positioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

1.4.1 System Cabinets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

1.4.2 10 to 30kVA UPS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

1.4.3 Moving the Cabinets. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

1.4.4 Clearances. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

1.4.5 Access . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

1.4.6 Final Positioning. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

1.4.7 Floor Anchoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

1.4.8 Cable Entry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

1.5 External Protective Devices. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

1.5.1 Rectifier and Bypass Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

1.5.2 External Battery. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

1.5.3 UPS Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

1.6 Power Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

1.6.1 Cable Termination . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

1.7 Control Cables and Communication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

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

1.8 Dry Contacts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

1.8.1 Input Dry Contacts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

1.8.2 Maintenance Bypass Cabinet Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

1.8.3 External Circuit-Breaker Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

1.8.4 Output Dry Contacts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

1.8.5 Emergency Power Off Input. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

1.8.6 External Bypass Switch Interlock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

1.8.7 Battery Start Facility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

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

2.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

2.2 Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

2.3 Battery Cabinet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

2.3.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

2.3.2 Temperature Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

2.3.3 Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

2.3.4 Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

2.3.5 Circuit Isolator Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

2.3.6 Battery Temperature Sensor (Optional) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

2.3.7 Moving the Battery Cabinets. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

2.3.8 Cable Entry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

2.3.9 General Arrangement Drawings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

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2.4 Battery Power Cables. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

2.4.1 Connection Principles. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

2.4.2 Fitting the Batteries. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

2.4.3 Connecting the Battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

2.4.4 Battery Room Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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 Cabinet Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

3.2.2 External Protective Devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

3.2.3 Power Cables. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

3.2.4 Control Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

3.3 Hot-Standby UPS Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

3.3.1 Cabinet Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

3.3.2 External Protective Devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

3.3.3 Power Cables. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

3.4 Dual Bus System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

3.4.1 Cabinet Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

3.4.2 External Protective Devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

3.4.3 Power Cables. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

3.4.4 Control Wires . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

3.4.5 Extended Dual Bus Synchronization Option (DBS Interface Box) . . . . . . . . . . . . . . . . . . . . . 32

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

5.0 OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39

5.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

5.1.1 Split-Bypass Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

5.1.2 Static Transfer Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

5.1.3 Battery Temperature Compensation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

5.1.4 Redundant Control Power Supply Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

5.1.5 Socket Outlet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

5.2 Multi Module UPS—1+N . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

5.2.1 Features of NX Multi-Module UPS Configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

5.2.2 Requirements for Paralleling of UPS Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

5.3 Modes of Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

5.3.1 Normal Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

5.3.2 Battery Mode (Stored Energy Mode) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

5.3.3 Auto-Restart Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

5.3.4 Bypass Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

5.3.5 Maintenance Mode (Manual Bypass) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

5.3.6 ECO Mode (Single UPS Only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

5.3.7 Parallel Redundancy Mode (System Expansion) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

5.3.8 Hot-Standby Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

5.3.9 Frequency Converter Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

5.4 Battery Management—Set During Commissioning. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

5.4.1 Normal Function. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

5.4.2 Advanced Functions (Software Settings Performed by the Commissioning Engineer) . . . . . 44

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

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

6.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

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

6.2 UPS Startup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

6.2.1 Start-Up Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

6.2.2 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 Mimic Power Flow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

7.1.2 Audible Alarm (Buzzer) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

7.1.3 Direct Access Push Buttons (Keys) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56

7.1.4 LCD Monitor and Menu keys. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56

7.1.5 Detailed Description of Menu Items . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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 Battery Ground Fault Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66

8.1.2 Redundant Fan for Power Module. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67

8.1.3 OC Web Card - SNMP/HTTP Network Interface Card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68

8.1.4 Relay Card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69

8.1.5 Multiport-4 Card. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69

8.2 OC485 Web Card – Modbus, Jbus, IGM Net . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71

8.2.1 Remote Alarm Monitor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71

8.2.2 Dust Filter for 10-30kVA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72

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

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

iv

FIGURES

Figure i Model number nomenclature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vi

Figure 1 Residual current circuit breakers (RCCB) symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Figure 2 Auxiliary terminal block detail monitoring board (U2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Figure 3 Input dry contacts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Figure 4 Jumper connection for BCB interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Figure 5 Output dry contacts and EPO wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Figure 6 Battery start for UPS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Figure 7 Single temperature sensor and monitor board-U2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Figure 8 Battery cabinet bottom cable entry location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Figure 9 Battery cabinet with fuse or optional circuit breaker locations . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Figure 10 Battery cabinet internal layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Figure 11 Battery cabinet, bottom entry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Figure 12 Battery room design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Figure 13 Emergency power off connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Figure 14 Typical 1+N system block diagram with common input supply, with separate batteries

and optional output / bypass distribution panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Figure 15 Dry contacts, multiple UPS modules with distribution panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Figure 16 Connection of 1+N system parallel control cables. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Figure 17 Hot standby configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Figure 18 Typical dual bus system configuration with static transfer switch and Load Bus Synch . . . . . . 31

Figure 19 Connections of a typical dual bus system utilising Load Bus Synch . . . . . . . . . . . . . . . . . . . . . . . 32

Figure 20 Electrical connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

Figure 21 General arrangement—10-30kVA UPS module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Figure 22 10-30kVA NX front view with doors open . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

Figure 23 Location of parallel logic board M3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Figure 24 Internal battery layout and connecting—GP12120 F2 (12AH/12V) . . . . . . . . . . . . . . . . . . . . . . . 37

Figure 25 Internal battery layout and connecting—LC-R127R2PG1 (7.2AH/12V) . . . . . . . . . . . . . . . . . . . . 37

Figure 26 Internal battery layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

Figure 27 Single unit block diagram with split-bypass input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

Figure 28 Multiple battery temperature sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

Figure 29 1+N multi-module UPS with external maintenance bypass switch . . . . . . . . . . . . . . . . . . . . . . . 41

Figure 30 Example of configuration for single UPS with external maintenance bypass cabinet. . . . . . . . . 49

Figure 31 UPS control and display panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54

Figure 32 Graphic LCD monitor windows and keypad . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56

Figure 33 Menu tree . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

Figure 34 Help screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64

Figure 35 Default screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65

Figure 36 Battery ground fault detection set connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66

Figure 37 Redundant power module fan set. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67

Figure 38 Communication bays and cable location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67

Figure 39 OC Web Card data summary window . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68

Figure 40 OC Web Card battery data summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68

Figure 41 SiteNet MultiPort4 Intellislot pin configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70

Figure 42 OC485 Web card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71

Figure 43 Dust filter replacement. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72

v

TABLES

Table 1 Maximum steady state AC and DC currents. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Table 2 Distance from floor to connection point on the equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Table 3 Input dry contacts at X3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Table 4 Maintenance bypass cabinet interface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Table 5 External circuit-breaker interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Table 6 Output dry contact relays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Table 7 EPO input contact relays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Table 8 Dimensions and weight. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Table 9 UPS operating modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

Table 10 Rotary switch configurations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

Table 11 UPS control and display panel components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54

Table 12 Rectifier indicator—1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

Table 13 Battery indicator—2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

Table 14 Bypass indicator—3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

Table 15 Inverter indicator—4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

Table 16 Load indicator—5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

Table 17 Status (Alarm) indicator—6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

Table 18 Audible alarm key . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

Table 19 Menu key Icons and their meaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56

Table 20 UPS system window . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58

Table 21 Descriptions of UPS menus and data window items . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58

Table 22 UPS messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60

Table 23 Prompt windows, meanings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64

Table 24 Dry contact fault alarm signal is available for remote monitoring . . . . . . . . . . . . . . . . . . . . . . . . 66

Table 25 Relay Card pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69

Table 26 Relay card jumpers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69

Table 27 SiteNet MultiPort4 Intellislot pin assignment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70

Table 28 NX communication options. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71

Table 29 Compliance with European, international standards. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73

Table 30 Environmental characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73

Table 31 Overall efficiency, heat losses and air exchange . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73

Table 32 Mechanical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74

Table 33 Rectifier AC input (mains) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74

Table 34 Battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75

Table 35 Inverter output to critical load . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75

Table 36 Bypass mains input. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76

vi

Figure i Model number nomenclature

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 Model

Identification Note

Battery cabinet NXE0NBCS

Battery Ground Fault detection kit NXA0UFXBGF

Battery temperature probe (for external battery) NXA0UFXBTS

Maintenance bypass cabinet (separate bypass input) NXE0NMBX Specify total system kVA

Fan Redundancy kit NXE0UFXRF Specify UPS kVA rating

Seismic Anchor kit NXA0UFXSAN

Dual bus control cable 05-10-15 metres NXA0UFXD Specify length in metres

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

These are Intellislot plug-in cards (3 slots

available).

RAM - Remote Alarm Monitor NXA0CFXRAM Requires RELAYCARD-INT

Modem card NXA0CFXMOD

Extended LBS box NXA0UFXLBS

Air Filter NXA0UFXARF One filter

Dual Bus Extension Kit 50-150 Meters NXXXXMLBSKIT

(XXX: 050 or 150) - Specify length in

meters. Used for extension in length or

dual bus arrangement between Nx and

non-Nx sources'

Individual Battery Monitoring BDS 40 or

BDS 256

Specify number of blocks. Consult

Emerson Network Power representatives

for complete configuration

NXe U

NX Product Line

Revision

to Base

Unit

Feature Set for Region

A0 - EMEA

B0 - Aust/NZ

C0 - Japan

D0 - China

E0 - Latin Amer

F0 - Other

Input &

Output

Voltage

50/60Hz

Voltage Code

220/380 F

230/400 U

240/415 G

0A0 010

Output kVA

010

015

020

1

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 war-

ranty.

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 envi-

ronment, 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 Aus-

tralia and New Zealand EMC Framework (C-Tick) and with the following product standards for Unin-

terruptible 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 man-

ufacturer 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.

2

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-ser-

vice personnel. Contact with hazardous voltage is minimized by housing live parts behind safety pan-

els 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 car-

ried out only by trained personnel.

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.

!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.

Single Module UPS Installation

3

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 install-

ing engineer. The particular conditions of each site will determine the applicability of such proce-

dures.

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.

! 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.

Single Module UPS Installation

4

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 envi-

ronment 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.

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 main-

tained 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).

NOTE

The UPS is suitable for mounting on concrete or other non-combustible surface only.

!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.

Single Module UPS Installation

5

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 posi-

tion.

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. Oper-

ational status and alarm information is provided through the front door operator control panel. Mod-

els 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 particu-

lar 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 inter-

nally 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 bat-

teries that can be connected to the UPS to increase its battery run time.

1.4.3 Moving the Cabinets

Ensure that the UPS weight is within the designated surface weight loading of any handling equip-

ment. 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.

!

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.

NOTE

Care must be taken when maneuvering units fitted with batteries. Keep such moves to a

minimum.

Single Module UPS Installation

6

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 recom-

mends providing adequate clearance in the front of the equipment for unimpeded passage of person-

nel 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.

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.

!WARNING

Casters are strong enough for movement across even surfaces only. Caster failure could occur

if they are subjected to shock loading.

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).

Single Module UPS Installation

7

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 split-

bypass 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 dis-

connect 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 characteris-

tics (see Table 35).

Single Module UPS Installation

8

1.6 Power Cables

The cable design must comply with the voltages and currents provided in this section, follow local wir-

ing 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.

!WARNING

Failure to follow adequate earthing procedures may result in electromagnetic interference or

in hazards involving electric shock and fire.

Table 1 Maximum steady state AC and DC currents

UPS

Rating

(kVA)

Nominal Current, Amps Busbar Stud Size

Input Mains Current 1,2

With Full Battery

Recharge

3ph + N

Output Current2

at Full Load

3ph + N

Battery at

End of

Discharge

Input/Output/

Bypass

Cables External

battery

Cables

(Bolts)

Torque

Load

(Nm) 380V 400V 415V 380V 400V 415V Bolt

Hole

Dia.

(mm)

10 22 21 20 15 14 13 22

M6 6 M6 5

15 33 32 31 22 21 20 33

20 44 43 42 30 29 28 44

30 63 62 61 45 44 42 66

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)

Single Module UPS Installation

9

1.6.1 Cable Termination

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.

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.

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

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.

NOTE

The earthing and neutral bonding arrangement must be in accordance with local and national

codes of practice.

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.

NOTE

For frequency converter operation, ensure that the linking busbars between bypass and rectifier

input are removed.

Single Module UPS Installation

10

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.

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.

8. Refit all protective covers removed for cable installation.

!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.

!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.

Single Module UPS Installation

11

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:

• 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

Figure 2 Auxiliary terminal block detail monitoring board (U2)

Intellislot 2

Intellislot 1

Intellislot 3

J1J3

J22

J23

J12

J9

X4

J15

J16

J17

J24

J10J30J26J4J28J25J21

J13

Dry In MBC BCB

BFP INV ACF EPO

X1 X2 X3

J2

LCD

J8

X7

X6

X5

X4

PWR

Modem

SNMP Card

The black square ( )

on each slot indicates Pin 1.

Single Module UPS Installation

12

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

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 ter-

minal 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.

1.8.2 Maintenance Bypass Cabinet Interface

J26 and J30 are the MBC interface.

Table 3 Input dry contacts at X3

Position Name Description

J4.1 ENV3Battery Room Alarm (NC)

J4.2 BtG Battery Ground Fault Detection (NC)

J4.3 GEN1,2 On Generator (NO)

J4.4 +12V +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.

Table 4 Maintenance bypass cabinet interface

Position Name Description

J26.1 T_IT1Input 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_OT1Output 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.

X3

12V

J4 J26 J30 J10

12V

GEN

BtG

ENV

GND

AUX_I

T_IT

FB

GND

F_FAN

FUSE

OL

DRV

12V

AUX_O

T_OT

12V 12V

12V

Single Module UPS Installation

13

1.8.3 External Circuit-Breaker Interface

J10 is the interface to any external battery circuit breaker (BCB).

Figure 4 Jumper connection for BCB interface

Table 5 External circuit-breaker interface

Position Name Description

J10.1 DRV BCB Driver Signal - (reserved)

J10.2 FB BCB Contact State -(reserved)

J10.3 GND Power Ground

J10.4 OL 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.

UPS Monitoring Board

J10

OL

DRV

GND

FB

Battery Circuit Breaker

OL

Aux – N.O.

Aux – N.O.

Single Module UPS Installation

14

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

Table 6 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.

EPO - NCEPO - NO

X2X1

BFP_C

J21 J25 J28

BFP_S

BFP_O

INV_O

INV_S

INV_C

ACF_C

ACF_S

ACF_O

J13

+12V

Single Module UPS Installation

15

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.

X5: Auxiliary DC Power Output

Auxiliary DC power for modem or external SNMP card. The voltage is between 9V to 12V. The maxi-

mum 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

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.

Single Module UPS Installation

16

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 person-

nel.

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). Pro-

vides external output interlock protection for paralleled UPS modules. Short circuit means external

output switch closed.

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

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.

Battery Start Button

Battery Installation

17

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. Complete installation, comprising the battery cabinet, batteries and protective device.

2. Battery cabinets and protective device only—batteries supplied by others

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

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

Battery Installation

18

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 hazard-

ous. 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 immedi-

ately 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.

Battery Installation

19

2.3 Battery Cabinet

2.3.1 Introduction

This cabinet can also be used in conjunction additional cabinets, to provide the necessary accommoda-

tion 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). Tempera-

ture 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.

2.3.5 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 con-

tacts). Refer to 1.8.3 - External Circuit-Breaker Interface for details.

Table 8 Dimensions and weight

Model

Optional

Circuit Breaker

Amperes

Maximum

Discharge Current

(at EOD)

External Cabinet

WxDxH mm (in)

Cabinet Weight

Without Batteries

kg (lb)

Battery Cabinet

50A

10kVA 22A

15kVA 33A

20kVA 44A 820x700x1400

(32-1/4x27-5/8x55) 170 (375)

80A 30kVA 66A

Battery Installation

20

2.3.6 Battery Temperature Sensor (Optional)

The optional external battery temperature sensor kit contains one probe and one temperature trans-

port board as illustrated in Figure 7. It is connected to the UPS Monitor Board.

Figure 7 Single temperature sensor and monitor board-U2

2.3.7 Moving the Battery Cabinets

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.

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 blank-

ing piece fitted at the bottom to reveal the cable entry hole.

!

WARNING

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

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.

Temperature

Sensor

TMP-2

+

IN

-

NC

12V

GND

OUT

UPS

Monitor

Board

– U2

X7

-12V

GND

BAT-T

Cable W2 is packed with the temperature sensor.

Name: W2 L=5m

Name: W1 L=30m

Battery Installation

21

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

828

620

1400

100

700

83

82,5

250

All dimensions are

expressed in millimeters.

Bottom View

Battery Installation

22

Figure 9 Battery cabinet with fuse or optional circuit breaker locations

Bottom cable entry

Battery Installation

23

Figure 10 Battery cabinet internal layout

Minimum service space 65mm

3 Layers:

Largest battery dimensions:

201x170x190 (LxWxH)

Positions of captive nuts for grille mounting

1 Layer:

Largest battery dimensions:

201x170x190 (LxWxH)

Captive nut M6

Hex flange

screw M6x16

1.

15

29

43

Detail B

B

215 280 280 280 292

65 65 65 102

201 10 201 10 2017

635

738

15170101701017010170

520110201218

517010170

368

635

308,6 280 280 328,4

437,8

218,5

AMNXE0NBCSL4BT

All measurements are in millimeters.

Battery Installation

24

Figure 11 Battery cabinet, bottom entry

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.

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

10

8

8

5

1

2 3

4

9

6

13

12

12

11 13

4

6

7

AMNXE0NBCSL4BT

Battery Installation

25

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 pos-

sibility 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 - Bat-

tery Control for details on connecting the circuit breaker box available for the Liebert NX.

Figure 12 Battery room design

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

1

2

3

4

UPS Multi-Module Installation

26

3.0 UPS MULTI-MODULE INSTALLATION

3.1 General

The installation of a multi-module UPS configuration must follow the installation procedure for a sin-

gle 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.

Figure 13 Emergency power off connections

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.

UPS2

UPS1

Monitor Board

Monitor Board

X2:1

X2:2

X2:1

X2:2

EPO

UPS1

X2:3

X2:4 Monitor Board

UPS2

X2:3

X2:4 Monitor Board

EPO

UPS Multi-Module Installation

27

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 proce-

dures 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

Distribution Cabinet

TO LOAD

QUPS

Q1EXT

SW1-A

SW1-D

INVERTER

BATTERY 1

FUSES

CHARGER

UPS1

SUPPLIED BY OTHERS

INPUT MAINS

SUPPLY L1, L2, L3, N

L1, L2, L3, N L1, L2, L3, N

SUPPLY L1, L2, L3, N

CB1

RECTIFER

SW1-C

STATIC

SWITCH

BATTERY 2

FUSES

CHARGER

UPS2

INPUT MAINS

CB1

RECTIFER

SW1-C

STATIC

SWITCH

INVERTER

SW1-A

Q2EXT

QBYP

UPS Multi-Module Installation

28

Figure 15 Dry contacts, multiple UPS modules with distribution panel

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.

Input Distribution

Distribution Panel

UPS 1 UPS 2

Q1Ext

To Load

Q2Ext QnExt

QByp

QUPS

UPS N

M3 Board

X3

Ext. Maint. Ext. Out

M3 Board

X3

Ext. Maint. Ext. Out

M3 Board

X3

Ext. Maint. Ext. Out

1234 123 4 1234

UPS Multi-Module Installation

29

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

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 soft-

ware. 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 out-

put 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.

3.3.2 External Protective Devices

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

NOTE

If it is a hot-standby system, the master (downstream) must be turned on first.

X1-1 X1-2

X2-2 X2-1

Parallel Board

X4

X3 P5

P3

P4 P1

P2

X1-1 X1-2

X2-2 X2-1

Parallel Board

X4

X3 P5

P3

P4 P1

P2

X1-1 X1-2

X2-2 X2-1

Parallel Board

X4

X3 P5

P3

P4 P1

P2

X1-1 X1-2

X2-2 X2-1

Parallel Board

X4

X3 P5

P3

P4 P1

P2

X1-1 X1-2

X2-2 X2-1

Parallel Board

X4

X3 P5

P3

P4 P1

P2

X1-1 X1-2

X2-2 X2-1

Parallel Board

X4

X3 P5

P3

P4 P1

P2

1 2 3 4 5 6

UPS

UPS Multi-Module Installation

30

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 down-

stream UPS through its inverter or bypass. The bypass and the main input sources must be refer-

enced 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 Mod-

ule UPS Installation.

No control wires other than those specified for the single module configuration are required.

Figure 17 Hot standby configuration

INPUT DISTRIBUTION

T

O

L

O

AD

CB1

UPS1

OUTPUT

CB1

DOWNSTREAM UPSTREAM

RECTIFIER

STATIC

SWITCH

INVERTER

Mains L1,

L2, L3, N

L1, L2, L3, N L1, L2, L3, N

Bypass L1,

L2, L3, N

Bypass L1,

L2, L3, N

Mains L1,

L2, L3, N

UPS Multi-Module Installation

31

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 stan-

dard Load Bus Synchroniser activated. Depending on the configuration, follow the appropriate instal-

lation 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 sys-

tems (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

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

Input

Rectifier

UPS1

Bypass

supply

Input

Rectifier

UPS 6

Intermodule

control cable

STS

LBS

Load

Intermodule

control cable

Bypass

supply

Input

Rectifier

Input

Rectifier

UPS 6UPS1

UPS Multi-Module Installation

32

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

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 sys-

tem 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

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

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.

UPS

X1-1 X1-2

X2-2 X2-1

Parallel Board

X4

X3 P5

P3

P4 P1

P2

X1-1 X1-2

X2-2 X2-1

Parallel Board

X4

X3 P5

P3

P4 P1

P2

8

X1-1 X1-2

X2-2 X2-1

Parallel Board

X4

X3 P5

P3

P4 P1

P2

X1-1 X1-2

X2-2 X2-1

Parallel Board

X4

X3 P5

P3

P4 P1

P2

8

UPS

B

Parallel System I Parallel System II

DBS Cable

A

Installation Drawings

33

4.0 INSTALLATION DRAWINGS

Figure 20 Electrical connections

X5

X3

X4

X1

X2 Ext EPO

BCB

Monitor Board

Input

MBC

External Battery

Batt

UPS

Parallel Board

To Customer’s Safety

Earth

Earth

A

B

C

N

A

B

C

N

To Critical Load

Main/Bypass Input

Supply

Power

Cables

+

N

-

J28-1

J28-2

X3 X7

J25

J30

J26

J21

X3

J13

J4

Gen

BPS

AFC

RS-485

Modem-

SNMP

Ext. Maint.

Ext. Out

J28-3

J28-4

J10-1

J10-2

J10-4

J10-3

J22-2

J22-3

J22-4

Installation Drawings

34

Figure 21 General arrangement—10-30kVA UPS module

FRONT VIEW LEFT SIDE VIEW

Leveling feet

Detail A, rear of unit

shown without side panel

Lev

e

10mm dia threaded

mounting holes

86.5

7

2

1

700

600

1400

90

867.5

1380

TOP VIEW BOTTOM VIEW

625

420

180

3 5

4

6

572

210

166

236

346

520

708

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

All dimensions are in mm.

Installation Drawings

35

Figure 22 10-30kVA NX front view with doors open

1

2

3

4

5

External Battery Input

Bypass Input

Main Input

Output

T1

T2

1) Main/Bypass Input terminal (T1)

2) Battery /Output terminal (T2)

3) Input circuit breaker (CB1)

4) Rotary switch (SW1)

5) Monitor board (U2)

Installation Drawings

36

Figure 23 Location of parallel logic board M3

Battery

Start

Interface

NXe 10-30kVA Top View

Parallel

Logic

Board

Installation Drawings

37

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

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

NOTE 1. TYPICAL USED FOR:GP 12120 F2 (12AH/12V)

BATTERY INTERCONNECT

WIRING DIAGRAM 2. REMOVE 43&44 WHEN 42 JARS ARE USED.

REMOVE 41~44 WHEN 40 JARS ARE USED.

BOTTOM LAYER

W501 4pcs 43 41 44 42

W506 W508

W503

BLK BLK BLK

BLK

W502

75

1

7533

1

W511 W510 W515 W514 W513 W512

TOP LAYER

Layer 5 Layer 4 Layer 3 Layer 2 Layer 1

+BATT IN

A2 BOARD

UPS MODULE

-BATT IN

J2 J6J4

RED

W508

W504

W506

W509 W505 W507

BLK

AA

BLU

NIN

W500

34Pcs

NOTE 1 TYPICAL USED FOR: LC-R127R2PG1 (7.2AH/12V)

BATTERY INTERCONNECT

WIRING DIAGRAM

BOTTOM LAYER

W506

G

BLU

BLK

RED

RED

BLU

BLK

G

C

I

C

I

E

K

M

E

K

M

W508

W503 W502

75 175331

W511

BLK BLK BLK BLK

W510

W515 W514 W513 W512

W521W519

W517

W520

W518W516

TOP LAYER

Layer 4 Layer 3 Layer 2 Layer 1

+BATT IN

A2 BOARD

UPS MODULE

-BATT IN

J2 J6J4

RED

W508

W504

W505

W506

W509 W507

BLK

AA

BLU

NIN

Layer 5

W501 4Pcs

W500

68Pcs

Installation Drawings

38

Figure 26 Internal battery layout

136mm

160mm

160mm

160mm

160mm

151mm

Battery

562mm

347mm

Operation

39

5.0 OPERATION

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 com-

mon 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) tech-

nology 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

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.

!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.

Bypass

Input

AC Utility

Input

UPS

Output

Neutral

Wire

SW1/D

SW1/C

Rectifier Inverter

Battery

Charger

Discharge

Battery

Static Swich

Static Swich

SW1/A

SW1/B

CB1

Mainten ance Bypass

Neutral

Wire

Operation

40

5.1.2 Static Transfer Switch

The circuit blocks labeled Static Switch in Figure 27 contain electronically controlled switching cir-

cuits 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.

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

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.

Temperature

Sensor

TMP-2

+

IN

-

NC

12V

GND

OUT

BCB Box

BCB Control

Board – C2

+12V

GND

OUT

X103

X105

X104

X106

X108

UPS

Monitor

Board

– U2

X7

-12V

GND

BAT-T

Temperature

Sensor

TMP-2

+

IN

-

NC

12V

GND

OUT

Temperature

Sensor

TMP-2

+

IN

-

NC

12V

GND

OUT

Temperature

Sensor

TMP-2

+

IN

-

NC

12V

GND

OUT

Operation

41

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 reli-

ability 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

Further, single unit or 1+N groups may be configured as “distributed redundant” systems with inde-

pendent 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 Opera-

tion for more information.

CB1

UPS1

OUTPUT

Qout all UPS

Qout UPS1 Qout UPS2

Qout Byp

Qin Ext

Byp

Qin UPS2 Qin UPS3

Qin UPS1

Qout UPS3

RECTIFIER

STATIC

SWITCH

INVERTER

L1,L2,L3,N L1,L2,L3,N L1,L2,L3,N L1,L2,L3,N L1,L2,L3,N L1,L2,L3,N

L1,L2,L3,N

L1,L2,L3,N

L1,L2,L3,N

Supplied by Others

Input Mains Supply Input Mains Supply Input Mains Supply

Bypass Mains Supply

Distribution Cabinet

Bypass Mains Supply

CB1

UPS2

OUTPUT

RECTIFIER

STATIC

SWITCH

INVERTER

CB1

UPS3

OUTPUT

RECTIFIER

STATIC

SWITCH

INVERTER

Operation

42

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.

5.3 Modes of Operation

The NX UPS is an on-line, double-conversion, reverse-transfer UPS that permits operation in these

modes:

•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

5.3.1 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, sup-

plies the critical AC load. There is no interruption in power to the critical load upon failure or restora-

tion 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.

NOTE

Optional isolation transformers are available for applications where sources do not share the

same neutral reference or where the neutral is not available.

Operation

43

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 inter-

ruption 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 pur-

pose of saving energy. In this mode of operation, not unlike UPS of line-interactive or stand-by tech-

nology, 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 pro-

grammed 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 criti-

cal 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 pro-

grammed 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 out-

put frequency. The input frequency may vary from 40Hz to 70Hz. In this mode the static bypass oper-

ation is disabled, and the battery becomes optional depending on any requirement to operate in

battery mode (stored energy mode).

Operation

44

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 compen-

sation 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.

Operating Procedures

45

6.0 OPERATING PROCEDURES

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.

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 corre-

spond 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.

!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.

Table 9 UPS operating modes

Operating Mode

Rotary Switch

Position Description

Normal Operation NORMAL The UPS is powering the load.

On Static Bypass BYPASS or

NORMAL

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.

On Test TEST

No load power is supplied by the UPS. The load is connected to utility

power via the Maintenance Bypass Supply line. NOTE: The load is not

protected against disturbances in AC input power in this mode.

On Maintenance

Bypass MAINT

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.

Table 10 Rotary switch configurations

Rotary Switch

Position OUTPUT (SW1-A) BYPASS (SW1-C) MAINT

(SW1-D) NEUTRAL (SW1-B)

NORMAL ✔✔ ✔

BYPASS ✔✔ ✔

TEST ✔✔ ✔

MAINT ✔

Operating Procedures

46

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.

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:

4. Turn the rotary switch to BYPASS.

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.

!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

Indicator State

Rectifier indicator 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.

Indicator State

Rectifier indicator Green

Battery indicator Off

Bypass indicator Green

Inverter indicator Off

Load indicator Green

Status indicator Amber

Operating Procedures

47

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 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 automati-

cally 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.

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.

Indicator State

Rectifier indicator Green

Battery indicator Off

Bypass indicator Off

Inverter indicator Green

Output indicator Green

Status indicator Green

NOTE

In bypass mode, the load is being powered by the utility and is not receiving conditioned power

through the inverter.

Operating Procedures

48

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.

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.

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 Powering Down the UPS

To power down the UPS completely, follow the procedures in 6.3 - Switching the UPS from Nor-

mal to Maintenance Bypass.

To completely isolate the UPS from the AC supplies, the main external power input isolator (both iso-

lators, where separate supplies are provided for rectifier and bypass) should be opened (see

Figure 30).

!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.

NOTE

Pressing the Alarm Silence Switch cancels the audible alarm, but leaves the warning message

displayed until the appropriate condition is rectified.

!WARNING

Wait 5 minutes for the internal DC busbar capacitors to discharge before attempting to

remove the internal protective barriers.

!WARNING

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.

!CAUTION

The load equipment is not protected from normal supply aberrations when operating in the

maintenance bypass mode.

!WARNING

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

Operating Procedures

49

6.5 Powering Down the UPS and Maintaining Power to Load

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.

The UPS is now completely powered down.

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.

NOTE

An external Maintenance Bypass Cabinet must be installed before attempting to perform the

following procedure

!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.

!WARNING

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

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

CB1 CB2SW

3P

Operating Procedures

50

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 man-

ually 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 mes-

sage 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.

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.

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.

!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.

Operating Procedures

51

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 pass-

word is 12345. This password provides access to UPS and battery test functions.

Operating Procedures

52

6.12 Isolating One Module in a Multi-Module System

1. With all UPS modules in the system in Normal mode, open the external output isolator.

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.

5. Open rectifier input breaker CB1.

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.

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.

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.

!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.

Operating Procedures

53

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 sys-

tem has been commissioned by authorized personnel and the external power isolators are open.

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 indi-

cator 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:

The UPS is now operating in NORMAL mode.

!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.

# 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

Operator Control Panel and Display

54

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

Table 11 UPS control and display panel components

Component # Function Button 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)_ F1-F4, Help LCD Menu keys

8 Emergency Power Off Button cover — —

EPO

INVERTER ON

FAULT CLEAR SILENCE ON/OFF

3

1

2

45

Status

?

Rotary SW. normal pos.17:2407-07

Manual turn on

Normal mode

17:29

17:30

07-07

07-07

7

8

6

INVERTER OFF

F2 F3 F4 HELPF1

LoadBypass Output

Liebert NX

020kVA 3X3

2005-10-22

Single

17:32:20

Normal

L1-N/L2

229.5

24.5

49.97

397.5

0.99

L2-N/L3

229.5

24.5

49.97

397.5

1.00

L3-N/L1

229.5

24.5

49.97

397.5

0.99

L1-N/L2 voltage (V)

L-N current (A)

Frequency (Hz)

L-L voltage (V)

Power Factor

The operator control panel is divided into three functional areas

Mimic Power Flow Chart Graphic LCD monitor with menu keys Direct Access keys

Operator Control Panel and Display

55

7.1.1 Mimic Power Flow

The LEDs mounted on the mimic flow chart represent the various power paths and current UPS oper-

ational status.

7.1.2 Audible Alarm (Buzzer)

UPS activity is accompanied by the following sounds

Table 12 Rectifier indicator—1

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 Status (Alarm) indicator—6

Green Normal Operation

Yellow UPS Warning e.g. AC Input Failure

Red UPS fault e.g. Fuse or Hardware failure

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

Operator Control Panel and Display

56

7.1.3 Direct Access Push Buttons (Keys)

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 param-

eters. 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.

Figure 32 Graphic LCD monitor windows and keypad

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.

Table 19 Menu key Icons and their meaning

Key F1 F2 F3 F4 Help

Window Type 1

Next Data Window

LEFT RIGHT

ENTER HELP

Window Type 2

Escape

UP DOWN

?

ESC

Liebert NX

20kVA 3X3

?

Output

2005-10-22

Unit #1

17:32:20

Normal

F2 F3 F4 HELPF1

Bypass

Main

A(AB) B(BC) C(CA)

Vphase V 220 220 220

Iphase A 20.5 20.5 20.5

Freq. Hz 50.1 50.1 50.1

Vline V 380 380 380

P.F. 0.99 0.99 0.99

Input breaker closed 01-12 12:28:16

Manual turn on 01-12 12:30:06

UPS in normal mode 01-22 12:30:16

4 - Current Record

Window

3 - UPS Data

Window

2 - UPS Menu

Window

1 - UPS System

Window

5 - Keypad Window

Operator Control Panel and Display

57

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

Battery

Battery voltage (V)

Battery current (A)

Battery temperature (°C)

Remain Time Min.

Battery capacity (%)

Battery boost charging

Battery float charging

Battery disconnected

Command

Battery maintenance test

Battery capacity test

System test

Stop testing

Freshening Charge

Stop Freshening

Charge

Version

UPS version

UPS model

Settings

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

System

Sout (kVA)

Pout (kW)

Qout (kVAR)

Single unit, no

parallel data

Records

(history log)

Language

(Choices for

display)

Mains (input)

L-N voltage (V)

L-N current (A)

Frequency (Hz)

L-L voltage (V)

Power factor

Load

Sout (kVA)

Pout (kW)

Qout (kVAR)

Loadlevel %

Crest factor

Bypass

L-N voltage (V)

Frequency (Hz)

L-L voltage (V)

Output

L-N voltage (V)

L-N current (A)

Frequency (Hz)

L-L voltage (V)

Power factor

TX Input *

L-N voltage (V)

L-L voltage (V)

* 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.

TX Output **

L-N voltage (V)

L-L voltage (V)

Operator Control Panel and Display

58

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.

Menu and Data Window

Use the horizontal arrow keys to navigate between any of the selectable menu and data windows.

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, ECO, Master, Slave or Unit # 1

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

(Status)

Normal, Warning or Fault

Normal = UPS operating Normal

Warning = System attention required, e.g. AC Input Failure

Fault = UPS Fuse or Hardware Failure

Table 21 Descriptions of UPS menus and data window items

Menu

Type Item Type Explanation

Mains

(input)

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

TX Input L-N voltage (V) Phase voltage

L-L voltage (V) Line-line voltage

Bypass

L-N voltage (V) Phase voltage

Frequency (Hz) Bypass frequency

L-L voltage (A) Line-line voltage

Output

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

TX Output L-N voltage (V) Phase voltage

L-L voltage (V) Line-line voltage

Load

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

Operator Control Panel and Display

59

System

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

Battery voltage (V) Battery bus voltage

Battery current (A) Battery bus current

Battery temperature (°C) Internal battery temperature °C

Remain Time Min. Battery run time remaining

Battery boost charging Battery is boost charging

Battery float charging Battery is float charging

Battery disconnected Battery is not connected

Records (history log) Displays all records in the history log

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

Settings

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.

Command

(start/stop

battery &

system

tests)

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 pop-

up window appears about 5 seconds later to show the results.

Stop testing Manually stops a battery maintenance test, battery capacity test or system

test.

Freshening Charge 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

Version 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.

Table 21 Descriptions of UPS menus and data window items (continued)

Menu

Type Item Type Explanation

Operator Control Panel and Display

60

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 Moni-

tor 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 pre-

warning, 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.

Operator Control Panel and Display

61

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.

Table 22 UPS messages (continued)

Message Description / Suggested Action (if any)

Operator Control Panel and Display

62

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.

Table 22 UPS messages (continued)

Message Description / Suggested Action (if any)

Operator Control Panel and Display

63

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.

Table 22 UPS messages (continued)

Message Description / Suggested Action (if any)

Operator Control Panel and Display

64

7.3 Prompt (Pop-Up) Windows

The prompt window is displayed during the operation of the system to alert the user to certain condi-

tions and / or to require user confirmation of a command.

7.4 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

Table 23 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.).

F2 F3 F4 HELPF1

Help information

Select the current record window

Press help key back to main menu

Select the previous menu item

Operator Control Panel and Display

65

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

F2 F3 F4 HELPF1

Liebert NX 2005-05-22 12:30:36

20 kVA-3x3 UNIT #1 NORMAL

Press any key, back to main menu

Options—For Assembly Inside the UPS Cabinet

66

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:

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

Table 24 Dry contact fault alarm signal is available for remote monitoring

Terminal Name Definition

21 Common Battery Ground Fault Detection – can be

programmed as Alarm or Pre-Alarm

22 NC

24 NO

BCB or

Contactor

Battery

Socket Output

Phase

Output

Neutral

Current Transformer

W1-A358 (installed

externally only)

Monitor Board

-U2

UPS

IN DRY-X3

+12V

BtG

Battery Ground

Fault Detection

Resys B470

(AC230)

11

14

A1

A2

K1 K2 I2 I2

4

2

Batt +

Batt -

Batt-N

X

X

Options—For Assembly Inside the UPS Cabinet

67

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

Figure 38 Communication bays and cable location

Fan120 Fan120Fan120Fan120

(AC Fan 1-4)(AC Fan 1-3)(AC Fan 1-2)(AC Fan 1-1)

Redundant AC Fan

TOP VIEW

Standard AC Fan

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.

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)

Top Bay

Mid Bay

Bottom Bay

Relay Card (no port setting required)

Multiport4 (no port setting required)

OCWeb LB / OC485 (port setting 2400 Baud)

Suggested routing of customer-supplied

communication cables

Gland plate for cable exit

DB-9

Monitor

Board

Top

Mid

Preferred Device This LocationLocation

Bottom

Location Preferred Device This Location

Options—For Assembly Inside the UPS Cabinet

68

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

Options—For Assembly Inside the UPS Cabinet

69

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.

**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

8.1.5 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.

Table 25 Relay Card pin configuration

Pin Function Operation

1 UPS Fault Closed if no UPS failure

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 Not supported– use External EPO terminal

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 Closed if not ON Battery power (Utility OK)

19 ÷ 23 Not Used

24 On Bypass Closed if ON BYPASS

25 Not Used

Table 26 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.

Options—For Assembly Inside the UPS Cabinet

70

Figure 41 SiteNet MultiPort4 Intellislot pin configuration

Table 27 SiteNet MultiPort4 Intellislot pin assignment

Pin

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

UPS

CPU

CPU

CPU

CPU

Options—For Assembly Inside the UPS Cabinet

71

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

8.2.1 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.

Table 28 NX communication options

Physical

description

of port

Labeled

ID Name

of Port

On the UPS

LCD screen,

under Settings,

controlled by:

Monitoring

Devices

supported

Baud

rate Comments

Top

Intellislot

Intellislot 2

(On Monitor Board) Comm 1

Multiport 4 any

Relaycard-int any

OCWEB-LB 2400 Not simultaneous with

Multilink in RS232-1

Modbus/Jbus 2400

Middle

Intellislot

Intellislot 1

(On Monitor Board) Comm 2

Multiport 4 any

Relaycard-int any

OCWEB-LB 2400 Not simultaneous with

Multilink in RS232-2

Modbus/Jbus 2400

Bottom

Intellislot

Intellislot 3

(On Monitor Board) Comm 3

Multiport 4 any

Relaycard-int any

OCWEB-LB 2400

Modbus/Jbus 2400

Top

DB9 port RS232-1 Comm 1 Multilink Serial 9600 Not simultaneous with Web

card in top Intellislot.

Bottom

DB9 port RS232-2 Comm 2 Service Software

(Reserved) 9600 Not simultaneous with Web

card in middle Intellislot.

Options—For Assembly Inside the UPS Cabinet

72

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

Bracket

Technical Specifications

73

9.0 TECHNICAL SPECIFICATIONS

9.1 Conformity and Standards

The UPS has been designed to conform to the following European and international standards:

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 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)

Table 30 Environmental characteristics

Rated power, kVA

Unit of

Measurement10152030

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)

Relative Humidity - 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)

Table 31 Overall efficiency, heat losses and air exchange

Rated Power, kVA

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

Inverter Efficiency (DC/AC)

(battery at nominal voltage 480VDC and full-rated linear load)

Rated Power, kVA 10152030

Battery Mode % 91.3 91.7 92.0 92.5

Heat Loss & Air Exchange (Ventilation)

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

Maximum Forced Air Cooling (front intake, back exhaust) L/sec (m3/hr) 119

(428) 239 (860)

Input and output voltage 400VAC, battery charged, full rated linear load

Technical Specifications

74

Table 32 Mechanical characteristics

Rated Power, kVA

Unit of

Measurement 10 15 20 30

Dimensions, WxDxH mm (in) 600x700x1400

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

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 1VAC 380/400/415

(3-phase and sharing neutral with the bypass input)

Input Voltage Tolerance 2VAC 305V to 477V

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

Frequency 2Hz 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)

Harmonic Current Distortion THDI % FL 3 3 3 3

Duration of Progressive

Power Walk-In sec 10 seconds to reach full rated current

(selectable 5 through 30 seconds in 5-second intervals)

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.

Technical Specifications

75

Table 34 Battery

Intermediate DC Circuit

Rated Power,

kVA

Unit of

Measurement 10 15 20 30

Battery Bus

Voltage VDC Nominal: 480V (VRLA Float charge is 540V)

Range: 400V - 616V

Number of Lead-Acid Cells

Nominal 240 = [40 x 6-cell (12V) blocks]

Maximum 264 = [44 x 6-cell (12V) blocks]

Float Voltage V/cell (VRLA) 2.25 V/cell (selectable from 2.2 –2.3V/cell)

Constant current and constant voltage (IU) charge mode

Temperature

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

Ripple Voltage % V float ≤1

Ripple Current % C10 ≤5

Boost Voltage V/cell (VRLA) 2.35 V/cell (selectable from 2.30-2.40V/cell)

Constant current and constant voltage (IU) charge mode

Boost Control

- 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

End Of

Discharge V/cell (VRLA)

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).

Battery Charge V/cell

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

Battery

Charging Power*

max current

(adjustable) 1

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 10 (8) 15 (12) 20 (16) 30 (24)

Rated AC Voltage 1 VAC 380/400/415 V (three-phase, four-wire with neutral

referenced to the bypass neutral)

Frequency 2Hz 50 / 60

Overload % Rated

110% for 60 min

125% for 10 min

150% for 1 min

>150% for 200 msec

Fault Current % Rated 340% current limitation for 200 msec

Non linear load capability 3% Rated 100%

Neutral current capability % Rated 170%

Steady state voltage stability % ±1 (balanced load), ±2 (100% unbalanced load),

Transient voltage response 4%± 5

Total Harmonic Voltage

Distortion (THDV) % < 1 (linear load), < 4 (non linear load 3)

Synchronisation - Window Rated frequency ± 2Hz (selectable ± 0.5 to ± 3Hz)

Slew Rate (Max change rate

of synch frequency) Hz sec

1 Hz/sec

selectable 0.1 to 3Hz/s (single UPS)

0.2Hz/sec (paralleled UPS)

Inverter Voltage Tolerance %V (AC) ±5

1. Factory set to 400V – 380 or 415V selectable by commissioning engineer.

2. Factory set to 50Hz; 60 Hz selectable by commissioning engineer. Frequency converter operation also selectable.

3. EN 50091-3 (1.4.58) crest factor 3:1

4. 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.

Technical Specifications

76

Table 36 Bypass mains input

Rated power, kVA Unit of

Measurement 10 15 20 30

Rated AC Voltage 1VAC

380/400/415 V

three-phase four-wire, sharing neutral with the rectifier input

and providing neutral reference to the output

Rated Current

380V A 15 23 30 45

400V A 15 22 29 43

415V A 14 21 28 42

Overload Capacity %

135% long term

170% 10 min

1000% 100 ms

Upstream Protection,

Bypass Line (by others) N/A Thermomagnetic circuit breaker, rated up to 125%

of nominal output current. IEC 60947-2 curve C.

Current Rating of Neutral Cable A 1.7 x In

Frequency 2Hz 50 / 60

Transfer Time (between

bypass and inverter) ms

Synchronous transfer: ≤1ms

Asynchronous transfer (default): 15 ms (50 Hz), 13.3 ms (60 Hz)

or 40, 60, 80, 100 ms, selectable

Bypass Voltage Tolerance % VAC

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)

Bypass Frequency Tolerance % ± 2.5 ± 5 ± 10 or ± 20 default ±10

Synchronisation - Window Hz 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.

Technical Specifications

77

NOTES

Technical Specifications

78

EmersonNetworkPower.com

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.

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.

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

Emerson Network Power.

The global leader in enabling Business-Critical Continuity™.

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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