Liebert 30-130kVA User Manual

AC Power For Business-Critical Continuity

Npower™ UPS

Operation & Maintenance Manual–30-130kVA, 60Hz, Single Module System

TABLE OF CONTENTS

IMPORTANT SAFETY INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

OVERVIEW OF MANUAL. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

1.0 INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3

1.1 System Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

1.1.1 Reliability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

1.1.2 Versatility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

1.2 Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

1.3 Modes Of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

1.3.1 Normal (Load On UPS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

1.3.2 Input Power Failure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

1.3.3 Recharge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

1.3.4 Overload . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

1.3.5 Bypass (Internal) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

1.3.6 External Maintenance Bypass . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

1.3.7 Off-Battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

1.4 Operator Controls. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

1.5 Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

2.0 THEORY OF OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8

2.1 General Component Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

2.1.1 UPS Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

2.1.2 Battery System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

2.2 Detailed Component Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

2.2.1 Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

2.2.2 Rectifier/Charger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

2.2.3 Battery Charging Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

2.2.4 Inverter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

2.2.5 Static Bypass Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

3.0 OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14

3.1 Operator Controls. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

3.1.1 Operator Control Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

3.1.2 Navigation Buttons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

3.1.3 Rotary Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

3.2 Security Access and Passwords . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

3.3 Display Screens and Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

3.3.1 Mimic Display Screen. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

3.3.2 Startup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

3.3.3 Shutdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

3.3.4 Status Reports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

3.3.5 Configuration Screens . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

3.3.6 Manual Transfer. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56

3.3.7 Battery Management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

3.3.8 Auto Restart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66

3.3.9 System Status Monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68

3.4 Faults, Alarms, Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71

3.4.1 Faults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71

3.4.2 Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72

3.4.3 Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88

3.5 Communication Interfaces. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88

3.5.1 RS-232 Port: Local Reporting Terminal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89

3.5.2 Worldwide Reporting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89

3.5.3 Remote Alarm Status Panel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91

3.5.4 SiteScan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91

3.5.5 Setting Up External Communication Devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92

3.6 Modes Of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92

3.6.1 Load on Bypass . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92

3.6.2 OK to Transfer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92

3.6.3 Momentary Overloads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93

3.6.4 Input Power Failure (Load on Battery). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93

3.6.5 Automatic Operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94

4.0 MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .96

4.1 Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96

4.2 Routine Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97

4.2.1 Record Log. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97

4.2.2 Air Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97

4.2.3 Battery Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97

4.2.4 Battery Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98

4.2.5 Torque Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99

4.3 Detecting Trouble . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100

4.4 Reporting a Problem. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100

4.5 Corrective Actions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100

4.6 Recommended Test Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100

FIGURES

Figure 1 UPS controls and display screen (with example of the monitor/mimic screen). . . . . . . . . . . . . . . . 6

Figure 2 80 kVA UPS outside and inside views . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Figure 3 Operator control panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Figure 4 Navigation buttons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Figure 5 Rotary switch. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Figure 6 Configuration screen. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Figure 7 User settings screen, page 6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Figure 8 Menu tree . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Figure 9 Main menu screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Figure 10 Monitor / mimic display screen example: normal power flow. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Figure 11 Mimic display screen example: utility fail. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Figure 12 Mimic display screen example: load on bypass, UPS module on and charging battery . . . . . . . . 22

Figure 13 Monitor / mimic display screen example: load on bypass, UPS module off, service mode . . . . . . 23

Figure 14 Mimic display screen detail . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Figure 15 Input status screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Figure 16 DC bus / battery status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Figure 17 Bypass input status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Figure 18 Output load status screen. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Figure 19 Active faults and alarms screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Figure 20 Active faults and alarms, loss of power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Figure 21 System ratings screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Figure 22 Mimic display screen with load on bypass and switches closed . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Figure 23 Startup / shutdown procedures screen. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Figure 24 Manual startup screen, close static switch contactors screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Figure 25 Target and ramp values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Figure 26 DC bus setpoint screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Figure 27 External maintenance bypass switch, dual-input UPS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Figure 28 External maintenance bypass switch, single-input UPS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Figure 29 Set number of battery cabinets screen. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

Figure 30 User shutdown screen. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Figure 31 Manual transfer / retransfer screen when transfer is allowed . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Figure 32 Manual transfer / retransfer screen when transfer is not allowed . . . . . . . . . . . . . . . . . . . . . . . . 34

Figure 33 Status report screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

Figure 34 Event log report screen showing most recent event. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Figure 35 Event log report screen showing previous event . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Figure 36 Event log report screen showing previous event . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Figure 37 History log metering report screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

Figure 38 History log status report screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

Figure 39 History log faults/alarms report screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

Figure 40 Configuration screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

Figure 41 System ratings, page 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

Figure 42 System ratings, page 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

Figure 43 System settings screen, page 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

Figure 44 Date setting screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

Figure 45 Time setting screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 46 System settings, page 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

Figure 47 System settings, page 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

Figure 48 Enter password screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

Figure 49 Single /dual input screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

. . . . . . . . . . . . 41

iii

Figure 50 Options screen, page 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

Figure 51 10% passive filter settings screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

Figure 52 Options screen, page 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

Figure 53 Options screen, page 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

Figure 54 Options screen, page 4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

Figure 55 Communication options Screen, page 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

Figure 56 Auto dial screen. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

Figure 57 Modem selection screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

Figure 58 Auto dial screen, page 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

Figure 59 Pager support configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

Figure 60 Communications options screen, page 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

Figure 61 User settings screen, page 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

Figure 62 User settings screen, page 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

Figure 63 User settings screen, page 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

Figure 64 User settings screen, Page 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

Figure 65 User settings screen, page 5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

Figure 66 10% Passive filter settings screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

Figure 67 User settings screen, page 6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

Figure 68 Factory settings screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

Figure 69 Factory settings screen, page 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

Figure 70 Factory settings screen, page 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

Figure 71 Alarm / fault name screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

Figure 72 Alarm edit screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

Figure 73 Customer alarm interface screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

Figure 74 Customer alarm interface screen, page 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

Figure 75 Programmable output relay board #1, AS400 assignment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

Figure 76 Relay assignments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

Figure 77 Programmable output relay board, standard set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54

Figure 78 Programmable output relay board, standard set, page 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54

Figure 79 Programmable output relay board, user defined . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54

Figure 80 List of alarm faults screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

Figure 81 Manual transfer / retransfer screen when transfer is allowed . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56

Figure 82 Manual transfer / retransfer screen when transfer is not allowed . . . . . . . . . . . . . . . . . . . . . . . . 57

Figure 83 Battery management screen. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

Figure 84 Battery test screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

Figure 85 Automatic test screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58

Figure 86 Set battery cycle screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59

Figure 87 Set battery duration screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59

Figure 88 Battery equalizer screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60

Figure 89 Auto screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60

Figure 90 Manual screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60

Figure 91 Equalize time period screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60

Figure 92 Equalize voltage screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

Figure 93 Battery temperature compensation charge screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

Figure 94 Battery temperature compensation enable/disable screen. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

Figure 95 Battery temperature compensation charge screen, page 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62

Figure 96 Battery temp compensation edit screen. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62

Figure 97 Battery cycle monitor screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62

Figure 98 Battery cycle monitor screen, page 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . 63

Figure 99 0-30 seconds discharge cycles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63

Figure 100 Summary page screen. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64

Figure 101 User settings, page 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65

Figure 102 Battery time low warning screen. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65

Figure 103 Auto restart setting screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66

Figure 104 Auto restart screen layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66

Figure 105 System status screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67

Figure 106 System status screen, page 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68

Figure 107 System status screen, page 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68

Figure 108 System status screen, page 4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68

Figure 109 Summary alarm in active position screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71

Figure 110 Summary alarm editing screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72

Figure 111 Pager support screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89

Figure 112 Load on bypass, UPS not available . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91

Figure 113 Load on bypass (UPS available and battery charging). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91

Figure 114 Utility fail, load on battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92

TABL ES

Table 1 Key locations on UPS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Table 2 Key locations on operator control panel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Table 3 External maintenance bypass switch positions and actions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

Table 4 External maintenance switch configuration options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

Table 5 Default time settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58

Table 6 Abbreviations used in alarm messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72

Table 7 Alarms, functions, and corrective actions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73

Table 8 Service terminal command summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88

Table 9 Battery voltage record . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97

Table 10 Circuit breakers with compression lugs (for power wiring) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97

Table 11 Terminal block with compression lugs (for control wiring) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97

Table 12 Recommended test equipment and tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98

IMPORTANT SAFETY INSTRUCTIONS

SAVE THESE INSTRUCTIONS.

This manual contains important instructions that should be followed during maintenance of your Npower UPS and batteries.

WARNING

Exercise extreme care when handling UPS cabinets to avoid equipment damage or injury to personnel. Refer to separate installation manual for equipment handling information and installation procedures.

Follow all battery safety precautions in 4.0 - Maintenance when installing, charging, or servicing batteries. In addition to the hazard of electric shock, gas produced by batteries can be explosive and sulfuric acid can cause severe burns.

In case of fire involving electrical equipment, use only carbon dioxide fire extinguishers or others approved for use in electrical fire fighting.

Extreme caution is required when performing maintenance.

Be constantly aware that the UPS contains high DC as well as AC voltages. With input power off and the battery disconnected, high voltage at filter capacitors and power circuits should be discharged within 30 seconds. However, if a power circuit failure has occurred, you should assume that high voltage may still exist after shutdown. Check with a voltmeter before making contact.

AC voltage will remain on the system bypass, the UPS output terminals and the static bypass switch, unless associated external circuit breakers are opened.

Check for voltage with both AC and DC voltmeters prior to making contact.

When the UPS system is under power, both the operator and any test equipment must be isolated from direct contact with earth ground and the UPS chassis frame by using rubber mats.

Some components within the cabinets are not connected to chassis ground. Any contact between floating circuits and the chassis is a lethal shock hazard. Exercise caution that the test instrument exterior does not make contact either physically or electrically with earth ground.

OVERVIEW OF MANUAL

The Npower manual is organized so that information can be found quickly. Each major topic is separated by sections, and there is a Table of Contents for each section. The names of the sections and their contents are described below.

Section 1 - INTRODUCTION is a summary of the Npower Uninterruptible Power System (UPS). It describes some of the unique features and benefits of the Npower UPS, as well as the design principles and standards that Liebert follows in the manufacture of each system. A description of the Npower system and an overview of its functions are also included.

Section 2 - THEORY OF OPERATION is an explanation of the major circuit groups of the Npower UPS. This section is for individuals who want to know both the basics and the specifics of each major component. The text explains how the UPS handles electrical disturbances and interruptions.

Section 3 - OPERATION is written for facility personnel responsible for the operation of the system. It details the procedures required to start-up the system, to transfer the load between the available sources, and to shut down the system. Both manual and automatic operations are described. Operator controls and displays, including the solid state liquid crystal display (LCD) screen, are illustrated and explained for the UPS Module.

Section 4 - MAINTENANCE lists routine maintenance checks and helps the Operator pinpoint and quickly resolve problems if they arise.

If you require assistance for any reason, call Liebert Global Services at 1-800-LIEBERT. For best service, please have the following information available:

Part Numbers:

Serial Numbers:

kVA Rating:

Date Purchased:

Date Installed:

Location:

Input Voltage:

Output Voltage:

Battery Reserve Time:

1.0 INTRODUCTION

1.1 System Description

The role of the UPS system is to supply uninterruptible, clean power to the critical load. It maintains a full-voltage, low-distortion output, even if the utility source power sags or becomes distorted.

If there is an outage of the source power, the UPS maintains power to the load until an alternate source of power is activated, or until the original power source is restored. If input AC power is not restored, the UPS maintains the load (with the battery plant) long enough that the critical equipment can be shut down in an orderly manner. The Npower UPS module displays the rate of battery discharge and calculates the amount of battery time remaining based on the actual connected load. The time that the battery will maintain the load depends on the capacity of the battery backup plant and the size of the load.

The system control logic automatically manages critical bus operation. System logic is resident in Digital Signal Processors (DSPs) for precise control and improved reliability.

If the critical load current exceeds the rated load of the Npower UPS system, the control logic determines the magnitude of the overload and reacts appropriately. Overloads are usually the result of inrush current requirements. The UPS system supports loads that are 150% of the rated load for up to 60 seconds, 125% of the rated load for up to ten minutes, and 104% of the rated load indefinitely.

If the load surpasses the overload capacity of the UPS, the load is automatically transferred to bypass without interruption. When the load returns to within the UPS rating, it is either automatically or manually returned (retransferred) to the UPS. How and when the load is returned to the UPS depends on several factors: how long the overload lasted, how many overload conditions occurred before transfer, whether there is an imminent failure of any part of the UPS, etc. In the unlikely event of a fault within the UPS, the control logic, which continuously monitors all critical circuits within the UPS system, transfers the load to bypass without interruption and simultaneously sets off local and remote alarms. For a few specified faults, the UPS is shut down. The UPS can be manually returned to service when the fault has been corrected.

Introduction

The Npower UPS display system provides precise monitoring of the UPS, fast alarm response, and quick troubleshooting. For easy manual operations, menu-driven software provides access to several step-by-step help screens. All operator functions are performed using menu-prompted displays and a minimum number of operator controls. Available options include external communication capability with both automatic dial-out and dial-in features for early warning and diagnosis of abnormal conditions.

The system software allows the operator or Liebert Global Services to enter application specific information. Overload, overvoltage, battery discharge, and shutdown limits can be set by the operator. In effect, the software is tailored for each site.

The UPS system protects critical equipment from source power disturbances and outages, load faults, and UPS malfunctions. This triple protection virtually eliminates computer and computing equipment downtime as a result of utility source power problems.

1.1.1 Reliability

Reliability is the most important design goal for Uninterruptible Power Systems. All Liebert 3-Phase UPS systems have demonstrated reliability by achieving a field-proven critical bus MTBF in excess of one million hours. In addition, our Quality Assurance program is certified to the requirements of ISO 9001 standards.

Liebert UPS systems are ETL listed to the requirements of UL 1778, CSA Certified and (when applicable) CE marked. All equipment and components are manufactured to applicable UL, NEC, IEC, EN, NEMA, ANSI, IEEE, EN50091-1, EN50091-2 and CSA standards and guidelines.

Designed For Success

The keys to reliability in the design of the UPS system are using conservatively rated components, minimizing transfers to bypass, making operator controls understandable, and providing easy access for maintenance and repair. Liebert UPS systems lead the industry in all these areas.

For example, the Npower can clear substantial overloads through the solid state static bypass switch without transferring to the bypass source. By minimizing transfers to bypass, the Npower minimizes operation of electrical components and enhances system reliability.

As mentioned above, the system control logic has been packaged into Digital Signal Processors (DSPs) to optimize system performance and eliminate the failure-prone discrete logic boards used in other brands of UPS products. Furthermore, these DSPs are isolated from heat-generating components to ensure optimal operating temperatures.

Factory Backup and Service Assistance

Introduction

Reliability depends on more than just UPS module design. Improper installation can cause any system to fail. To prevent this, service technicians from Liebert Global Services thoroughly inspect the installation of all our systems to ensure they are installed properly and operating within performance specifications.

Once a UPS is properly installed, you -- the on-site equipment operator -- are the most important factor in preventing critical bus failures or unplanned transfers to bypass. To make your task easier, the UPS provides easy-to-follow, prompted instructions on its operator display screen.

If you ever need help, call your Liebert distributor or sales representative. Your attention to proper installation, operation, and periodic maintenance will ensure that your mission-critical operations receive the best possible protection from electrical disturbances and outages.

1.1.2 Versatility

The Npower has a number of features and options that can be customized to your specific needs. See

1.5 - Options for details. Visit the battery manufacturer’s Web site for information on obtaining the manual if you don’t already have it.

1.2 Safety Precautions

Read this manual thoroughly, paying special attention to the sections that apply to you, before working with the UPS. Also read the battery manufacturer's manual before working on or near the battery.

Under typical operation and with all UPS doors closed, only normal safety precautions are necessary. The area around the UPS system and battery should be kept free from puddles of water, excess moisture, or debris.

Special safety precautions are required for procedures involving handling, installation, and maintenance of the UPS system or the battery. Observe precautions in the separate Installation Manual before handling or installing the UPS system. Observe precautions in 4.0 - Maintenance of this manual before and during performance of all maintenance on the UPS or battery.

This equipment contains several circuits that are energized with high voltage. This is particularly true for oscilloscopes. Always check with an AC and DC voltmeter to ensure safety before making contact or using tools. Even when the power is turned Off, dangerously high potentials may exist at the capacitor banks. Observe all battery precautions when near the battery for any reason.

Introduction

ONLY qualified service personnel should perform maintenance on the UPS system. When performing maintenance with any part of the equipment under power, service personnel and test equipment should be standing on rubber mats. The service personnel should wear insulating shoes for isolation from direct contact with the floor (earth ground).

Unless all power is removed from the equipment, one person should never work alone. A second person should be standing by to assist and summon help in case an accident should occur. This is particularly true when work is performed on the battery.

Three types of messages are used throughout the manual to stress important text. Carefully read the text below each Warning, Caution, and Note and use professional skills and prudent care when performing the actions described by that text.

A Warning signals the presence of a possible serious, life-threatening condition. For example:

WARNING

Lethal voltages may be present within this unit even when it is apparently not operating. Observe all cautions and warnings in this manual. Failure to do so could result in serious injury or death. Do not work on or operate this equipment unless you are fully qualified to do so! Never work alone.

A Caution indicates a condition that could seriously damage equipment and possibly injure personnel. For example:

CAUTION

Make sure you understand the proper sequence before operating any circuit breaker. Operating a Maintenance Bypass circuit breaker out of sequence could cut off power to the critical load.

A Note emphasizes important text. If the note is not followed, equipment could be damaged or may not operate properly. For example:

NOTE

If the UPS system has a blown fuse, the cause should be determined before you replace the fuse. Contact Liebert Global Services.

1.3 Modes Of Operation

Refer to 2.0 - Theory of Operation and 3.0 - Operation for more details.

1.3.1 Normal (Load On UPS)

The utility AC source provides power to the rectifier/charger in the UPS module. The rectifier/charger converts the utility AC power to DC and supplies DC power to the UPS module inverter while simultaneously float charging the battery plant. The UPS inverter converts DC to AC and furnishes AC power to the critical bus.

1.3.2 Input Power Failure

If the utility source power fails or is outside the acceptable range, the battery plant becomes the primary supplier of DC power to the inverter.

1.3.3 Recharge

After the utility source power is restored, or an alternate power source becomes available, the rectifier/charger slowly walks-in to once again power the inverters and recharge the battery plant.

1.3.4 Overload

Overloads in critical systems may be caused by inrush currents during connected equipment startup or by faults in the critical load or distribution network. The Liebert Npower UPS system can maintain full output voltage regulation while sustaining the following overloads:

• Up to 125% for 10 minutes

• Up to 150% for 1 minute

• Up to 200% for 10 cycles

For momentary faults above 200% of rated current, the static switch turns on for 10 cycles to supply power from the bypass source. Up to 6,000 amps of current can be supplied for the first half cycle.

The critical load remains on the UPS module for the above conditions. If the UPS system overload capacity is exceeded, an automatic transfer to bypass is initiated, which keeps the static switch on and opens the inverter output contactor.

Whenever you have an overload condition, you should determine the cause of the overload.

1.3.5 Bypass (Internal)

The UPS control logic initiates an automatic transfer to the bypass source if the overload-current-versus-time curve is exceeded or if specified UPS system faults occur. You can also manually transfer the load to the bypass (without interruption) if you must take the UPS module out of service for maintenance.

With the rotary switch in the Bypass position, most key components and operating modes can be checked without disturbing the critical bus. However, certain key power-carrying components will require complete system shutdown or isolation through an external maintenance bypass cabinet for 100% service.

Introduction

1.3.6 External Maintenance Bypass

The installation of an External Maintenance Bypass Cabinet or panel board is recommended to allow you to totally isolate the UPS from all power sources. Use of the External Maintenance Bypass is described in SIB External Maintenance Bypass on page 30.

1.3.7 Off-Battery

The battery plant can be disconnected from the rectifier/charger by using an external Module Battery Disconnect (MBD) circuit breaker. The UPS continues to function normally, though it does not have power outage back-up capability until the battery plant is reconnected.

Figure 1 UPS controls and display screen (with example of the monitor/mimic screen)

MIMIC DISPLAY

RECT.

BATTERY

CHG

INV.

SYS. STATUS

LOAD

1.4 Operator Controls

Liebert Npower UPS modules are equipped with a microprocessor-based Operator Display Screen and Control Panel designed for convenient and reliable operation. The front panel location of the monitoring and control system enables the Operator to quickly identify the current status of the UPS and to perform most of the manual operations.

The operator display screen is driven by an easy-to-follow menu-prompted software program that controls and monitors the UPS system.

Detailed instructions on how to interpret the displays and use the controls are in 3.0 - Operation.

1.5 Options

A number of standard pre-designed options are available from Liebert for your UPS system. Described below are the most frequently provided options. Note that the battery items (1 and 2) are required to complete the UPS system. The remaining options provide improved system performance or convenience.

1. Battery and Racks. The batteries provide power in the event of a power outage. The Liebert UPS can use a variety of battery types, provided the battery plant is designed for the UPS DC voltage range and the load requirements of your application.

2. Module Battery Disconnect. The UPS system utilizes a separate Module Battery Disconnect for remotely located batteries. A sensing circuit in the UPS module, set at the battery low voltage limit, trips the Module Battery Disconnect to safeguard the battery from excessive discharge. The Module Battery Disconnect has an undervoltage release mechanism designed to ensure that during any shutdown or failure mode all battery potential is removed from the UPS system.

3. Input Distortion Filter (Trap). This filter reduces input current reflected harmonic distortion to less than 10% THD at full load. The filter is factory installed within the UPS. This filter also improves the input power factor to better than 0.95 lagging.

4. Load Bus Synchronization (LBS). The Load Bus Sync (LBS) option keeps two independent UPS modules (and therefore their critical load buses) in sync, even when the modules are operating on batteries or asynchronous AC sources. This means that critical loads connected to both load buses can switch seamlessly between the two.

5. SiteScan Central Monitoring System. Liebert manufactures a central monitoring system that automatically displays key UPS measurements and alarms, as well as data from a variety of sensors. This monitoring system signals alarms so corrective action can be taken. Events and data can be printed in hard copy. Data can be logged for analysis. The SiteScan Interface port is standard for the Npower.

6. Remote Alarm Status Panel. The UPS system may also be provided with an optional Remote Alarm Status Panel. This Panel provides eight LED indicators and may be placed at a convenient location near the critical load. A functional description of the Remote Alarm Status Panel is provided in 3.5.3 - Remote Alarm Status Panel.

7. Open Comms - Discrete Output Option OC-DO (Programmable Relay Board). Each option has 8 channels. Up to two Programmable Relay options can be installed in the same UPS. Any alarm/ event can be programmed onto any channel or channels. Programming is performed through the LCD display. Each relay channel has two sets of Form-C dry contacts rated 1 Amp @ 30 VDC or 250 mAmp @ 125 VAC.

8. Open Comms - Discrete Input Option OC-DI (Input Contact Isolator). Provides UPS module interface for up to eight user relay inputs (normally open dry contacts) for user alarm messages. The user through the LCD display can program the UPS alarm messages. The input alarm can also be installed to trigger an Open Comms - Discrete Output Option channel. Each alarm can have auto-dial, event log, and time delay (0 to 999.9 seconds).

9. Optional Power Supply (OPS). An additional control power supply is required when a Remote Alarm Status Panel and/or three or more battery circuit breakers are present in the system.

10. Internal Modem. Provides a 2400-baud modem in the UPS capable of dialing out from the UPS or accepting incoming calls and connecting to a remote terminal, computer or PC. A command set allows the user to view the alarm status, event log status, history status and system settings. The modem can also be configured to dial out two different telephone numbers, a primary and a backup number as a result of a significant UPS event. The selection of dial-out events is programmable by the Operator.

11. Network Interface Card - NIC. This option provides internal hardware and software to communicate (via SNMP and HTTP) to any I.P.-based Ethernet network. Connection to the network is made by a 10 baseT Ethernet cable provided by the user.

Introduction

2.0 THEORY OF OPERATION

2.1 General Component Description

The UPS system includes all of the equipment necessary to continuously provide computer- grade AC power to a critical load, even when there is an interruption of the utility line power. It consists of the UPS modules and a back-up battery plant. Refer to Figure 2.

2.1.1 UPS Module

The UPS module consists of system controls, a rectifier/charger, an inverter, protective devices, and other accessories.

System Controls: The system control logic automatically manages critical bus operation and monitors performance of the UPS module. Microprocessor technology and dedicated firmware provide advanced logic control and a comprehensive display of information. The UPS module status is displayed locally. Optional ports permit communicating with external devices.

Rectifier/Charger: The rectifier/charger converts utility power from AC to DC to charge the battery and provide the DC input to the inverter. Its design limits reflected harmonic current distortion to source power and provides low-ripple DC power for charging batteries.

Inverter: The inverter converts DC power into the precise AC power required to supply a sensitive critical load. The inverter converts DC power into a pulse-width-modulated (PWM) that is easily filtered into a clean sine wave output. The PWM also minimizes the harmonic voltage distortion caused by typical switching power supplies and other nonlinear load components used in computers and related electronics.

Theory of Operation

Static Bypass Switch: The static (solid-state) bypass switch immediately transfers the load from the inverter to the bypass AC power source in the event of a severe overload on the system or a failure within the UPS. This transfer takes place without any interruption of the power supplied to the load. The system includes redundant circuits to detect and isolate shorted SCRs in the static switch.

Bypass Circuit: The bypass circuit consists of switches and associated synchronizing and control circuitry to transfer the load to/from the bypass source.

2.1.2 Battery System

The battery is used as the alternate source of power to supply DC power to the inverter if the AC supply voltage is outside the acceptable range. The battery supplies power to the inverter until the utility power is restored or until an alternate power source is available. If AC source power is not restored or an alternate power source is not available, the battery can be sized to provide power long enough for an orderly shutdown of the load.

2.2 Detailed Component Descriptions

2.2.1 Controls

Hardware

The Npower UPS operator interface display system is designed to provide all of the information that is required for the operation of each UPS module. The following is a list of the hardware features:

1. The control logic performs automatic operations with minimal operator interface. The limited number of manual controls are easy-to-use.

2. Each Npower UPS cabinet is equipped with an easy-to-read liquid crystal display (LCD) screen. It presents information in a way that is easy to understand at an eye-level front panel location.

3. The display is controlled by a dedicated microprocessor with a non-volatile (EPROM) program and a battery-backed event memory.

4. The Npower can be ordered with communication ports for: a. Transmission of present status information to remote terminals via a resident auto-dial

communications program and an external or optional internal modem. This port also responds to inquiries of the UPS and history from the remote terminal.

b. Reporting UPS and history information in response to inquiries from a local terminal (no

modem required). c. Reporting information to a Liebert SiteScan Central Monitoring System. d. Relaying selected alarm messages to a Liebert Remote Alarm Status Panel and to a separate

terminal board for customer use. e. Reporting key systems information via SNMP interface to a network monitoring system.

Theory of Operation

NOTE

All external communication devices are optional equipment.

Firmware

The operator interface display system software enables the operator to monitor the UPS system status, to control the power flow through the UPS, to monitor all of the meter readings, to execute the start-up, shutdown, and the load transfer procedures, to access the event history files, and to make adjustments to the programmable parameters. The following is a list of the firmware features:

1. The menu-driven software prompts the operator for input.

2. Step-by-step instructions assist the operator during the start-up, shutdown, and the load transfer procedures. This helps to eliminate operator errors.

3. Graphics-based mimic diagrams illustrate the position of internal switches and the power flow through the UPS system.

4. The Present Status screen reports information about the system's present status. The History Status screen chronicles the events leading up to and immediately after a fault. The Event History screen lists all of the alarm messages that have been logged over a period of time.

Refer to 3.0 - Operation for a description of the controls and indicators located on the Operator Control Panel.

2.2.2 Rectifier/Charger

The UPS module rectifier/charger consists of input fuses, AC current-limiting circuit, battery equalize charge circuit, DC filter, battery charge-current-limiting circuit, and bridge rectifiers.

Operation

The rectifier/charger converts the AC input power to DC power. This conversion is accomplished by 3phase bridge rectifiers using SCRs. All phases are individually fused. For all modules, reflected input current THD is less than 30% at full load (which may be reduced to less than 10% with optional filter).

The filtered output of the rectifier/charger provides regulated DC power to drive the inverter and charge the battery.

Input

The input is sized to allow enough current to recharge the battery and supply a full-rated load at the same time.

Input Current Limit

AC input current sensing transformers (CTs) are used to measure current levels. Control circuitry monitors the CTs and restricts the AC current to less than 125% of the full input current rating by reducing the battery charging voltage. This current limit is adjustable from 100 to 125% of the system capacity measured in AMPS, with the default setting at 125% (maximum AMPS). An external dry contact closure (field supplied) activates a reduced second level of the battery charge current limiting circuit for use with a back-up generator.

Theory of Operation

Input Current Limit, Second Level

A second level of input current limit is initiated by an external contact closure (field supplied for use with back-up generator), and is adjustable from 85 to 100% (factory set at 100%).

During a rectifier re-start following battery discharge, the current slowly ramps up (walks-in) from 20% of the rated input current to 100% over a 15 to 20 second period. The maximum rate of change of the AC input current is 15% per second. The input current walk-in reduces the start-up surge distortion effects on all other equipment connected to the same source and prolongs the service life of internal components.

Input Current Inrush

The maximum sub-cycle of inrush current is typically less than 6-8 times normal.

Input Power Factor

The rated input power factor is no less than 0.80 lagging at the nominal input voltage and the full rated UPS load. The optional input filter will improve the power factor to better than 0.92 lagging at full load. Refer to drawings for your specific model.

2.2.3 Battery Charging Circuit

The UPS module charging circuit is capable of recharging the battery plant to 95% of full capacity within 10 times the discharge time. Recharging the last 5% takes longer because of characteristics inherent in the battery. DC ripple voltage is limited to 0.5% RMS to preserve battery life during longterm float charging while the UPS system is operating on utility source power.

Operation After Discharge

When commercial power is interrupted, the battery continues to supply DC power to the inverter without interruption to the critical load. If the AC source power is restored before the battery has fully discharged, the rectifier automatically restarts and resumes carrying the inverter and battery recharge load requirements.

Theory of Operation

Operation After End-of-discharge

The battery time screen displayed on the control panel enables you to estimate when battery shutdown will occur. You will have enough time to energize an alternate AC power source or to initiate an orderly shutdown of the critical load. If the battery plant discharges to the shutdown point during an outage, the UPS automatically disconnects the load, the AC input, and the battery. After AC input power is restored, the rectifier can be manually restarted by the Operator.

Battery Disconnect

The module battery disconnect (MBD) circuit breaker is used to isolate the UPS module from the battery during maintenance, and to automatically disconnect the battery from the inverter at the end of battery discharge. The MBD circuit breaker must be closed manually unless you have the optional motorized battery breaker. (See 3.3.8 - Auto Restart).

Battery Charge Current Limiting

The battery recharge current, after a battery discharge, is limited to between 1 and 25% (adjustable) of the full load maximum discharge current stated in AMPS. This regulates the amount of current that flows from the power source to the battery while the battery is recharging.

The battery charge current limit is factory set at one-half of maximum or 12.5% for normal operation and at 1% for alternate power source recharge operation.

Battery Equalize Charge Circuit

The battery equalize charge feature can be manually initiated or it can be programmed to operate automatically. Either can be selected from the battery equalize screen displayed on the control panel.

The automatic battery equalizing charge circuit increases the rectifier/charger output voltage to charge the battery anytime there is a power outage of 30 seconds or longer. The equalizing voltage is slightly higher than the float voltage. This helps all the batteries in a string to reach a uniform state of charge.

2.2.4 Inverter

The inverter is a solid state device that converts the DC output of the rectifier/charger or the battery to AC power.

Operation

The inverter converts DC power from either the battery or the rectifier/charger into three pulsewidth-modulated/six-step waveforms. These waveforms are filtered into low-distortion sine wave power. The inverter is controlled by a Digital Signal Processor (DSP). This DSP controls the precise synchronization, amplitude, and frequency of the output voltage.

In addition to the inverter efficiently supplying a regulated AC output from a DC source, the inverter output provides isolation between the critical load bus and the commercial source power. The inverter is configured to handle most critical load inrush surges. It maintains output voltage Total Harmonic Distortion (THD) within specifications even when handling nonlinear computer loads.

NOTE

The manufacturers of the valve-regulated batteries supplied with Liebert’s standard battery cabinets recommend that when first installed the batteries be equalize charged. After that initial equalize charge, they recommend no further equalize charging for their batteries. Other manufacturers may have different recommendations for their products. Consult the battery manufacturer’s manual for specific information about equalize charging.

Output Regulation and Overload Performance

The inverter is capable of sustaining full output voltage (±1% of the nominal voltage) for up to 150% overload at the output for as long as 60 seconds without reducing the output voltage. It can also handle at least 125% of the rated current for up to 10 minutes. If an overload exceeds the system capacity and a bypass source is available, the critical load is transferred to the bypass source and the inverter is disconnected from the load.

Nonlinear Load Characteristics

Computers and computer equipment with switching power supplies generate nonlinear currents rich in fifth and seventh harmonics.

The inverter pulse-width-modulated waveform, coupled with the output filter, provides a natural path for reducing the fifth and seventh harmonic currents produced by the load. The inverter/filter limits the output voltage THD to less than 3% with up to 100% typical electronic data processing (EDP) loads. EDP equipment characteristically includes both nonlinear and linear load components.

Unbalanced Load Characteristics

Unbalanced loads are actively regulated. The phase-to-phase voltage balance is maintained to within 2%, even with a 50% load imbalance.

2.2.5 Static Bypass Switch

A static bypass switch is an integral part of the UPS. An automatic transfer control circuit senses the status of the operator controls, UPS logic signals and alarm messages, and critical bus operating conditions. If the inverter output can no longer supply the critical load, the static bypass switch automatically transfers the critical load to the bypass source without interruption.

Static Switch Backfeed Protection

The static bypass system is equipped with redundant disconnect circuits that prevent backfeed of lethal voltage to the bypass input in the event of a shorted static switch SCR. If a shorted SCR is detected, the static bypass switch is isolated and an alarm is annunciated at the UPS control panel, while the critical load remains on UPS output power.

Theory of Operation

Pulsed Parallel Operation

When an overload condition such as magnetic inrush current or a branch load circuit fault exceeds 200% of the full-load current rating, the static bypass switch pulses on for 10 cycles. This allows up to 6000 amperes from the bypass line to clear the overload without a complete transfer to bypass (a Liebert design exclusive). The bypass source is in parallel with the UPS system, permitting the bypass source to carry the initial overload current. If the overload clears before 10 cycles, a load transfer to bypass is not made. If the overload condition continues to exceed the inverter capacity, the automatic transfer is made (maintaining the load voltage within the specified limits).

Load Transfers

Transfers to (transfer) or from (retransfer) the bypass may be performed automatically or manually in a make-before-break (MBB) sequence.

Manual load transfers and retransfers are initiated by the Operator from the UPS Control Panel.

Automatic transfers are initiated by the UPS system control logic when an overload is beyond the specified capabilities of the UPS inverter or when a fault occurs within the UPS module. An automatic retransfer is initiated if this function is enabled and if system conditions for a retransfer are present.

Theory of Operation

Transfer and Retransfer Conditions

1. Automatic Transfers to Bypass: Critical bus conditions that will initiate an automatic transfer of the critical load from the UPS

inverter output to the bypass source are: a. Output Overload: overcurrent condition in excess of the current-versus-time overload capacity

curve. b. Over/Under Voltage (OV/UV): critical bus voltage is outside the allowable tolerance. c. Inverter Inoperative: inverter diagnostic circuitry senses an imminent inverter output OV/UV

condition: d. Battery discharged to the shutdown voltage. e. Inverter or rectifier fault condition (power, logic, or over-temperature) present or imminent. f. Failure of system logic or logic power.

2. Manual Transfers: Manual transfers may be initiated at any time provided no transfer inhibition conditions are

present.

3. Transfer Inhibited: A manual transfer to the bypass source will be inhibited if any of the following conditions exist: a. Bypass frequency deviates ±0.5 Hz from the nominal. b. UPS system to bypass voltage difference (DV) exceeds a predetermined percentage (normally

10%).

c. OK to Transfer signal from the control logic is not present.

4. Automatic Retransfers to UPS: Critical bus conditions that must be present to initiate an automatic retransfer (Auto-Rexfer) of

the critical load from the bypass source to the UPS system are: a. The number of Auto-Rexfer Attempts selected must be greater than zero (0). If zero (0) is

selected, no automatic retransfer will occur. b. Critical load was initially transferred to the bypass source due to a system overload only. c. Overload has since been eliminated (the load has dropped below 100% of the rated load). d. Both the Input contactor and Battery (MBD) circuit breakers have remained closed since the

overload transfer. e. OK to Transfer signal received from the control logic for at least 10 seconds, within 5 minutes

of the overload transfer. (A manually initiated retransfer from bypass is required for

overloads lasting 5 minutes or more.) f. Cyclic-type system overloads, which occur up to five (select range is 0 to 5) times in 60

minutes, are automatically returned to the UPS system for each event including the Nth

overload. A manually initiated retransfer from bypass is required for the N+1 overload.

5. Manual Retransfers: Manual retransfers may be initiated at any time provided no retransfer inhibition conditions are

present.

6. Retransfer Inhibited: A retransfer (automatic or manual) from the bypass source to the UPS system shall be inhibited if

any of the following conditions exist: a. Retransfer Inhibitions:

1. Bypass frequency exceeds ±0.5 Hz of the nominal.

2. UPS system-to-bypass voltage difference (DV) exceeds a predetermined percentage (normally 10%).

3. OK-to-Transfer signal from the control logic is not present.

4. Inverter or rectifier fault.

b. Automatic Retransfer Inhibitions (in addition to those above):

1. The load transfer to bypass was not caused by an output overload.

2. Excessive cyclical overloads within a one-hour period.

3. Retransfer conditions are not satisfied within 5 minutes of the initial transfer.

3.0 OPERATION

3.1 Operator Controls

The Npower operator controls and indicators are located on the UPS Module Cabinet door and inside the cabinet. See Figure 2. The Operator Control Panel is located in the upper lefthand corner of the door, enabling the Operator to quickly identify the current status of the UPS system and to perform most of the manual operations. The operator display screen is driven by an easy-to-follow menuprompted software program. The internal control system executes programs which generate messages on this display screen. Screen messages instruct the Operator during start up, operation, and shutdown. The screen also displays status information upon request. Operating the UPS consists of watching the indicators on the operator control panel and making appropriate responses. Further UPS monitoring and testing is achieved by navigating through a series of menu selections on the display screen.

Figure 2 80 kVA UPS outside and inside views

Operation

Table 1 Key locations on UPS

Item Description Function

1 Operator Control Panel Contains Display screen, Navigation buttons and Emergency Power OFF button.

2 Rotary Switch Provides manual selection of Normal, Bypass and Service modes.

3 Fuse Blocks Contain fuses for UPS control power.

Figure 3 Operator control panel

Table 2 Key locations on operator control panel

Item Description Function

1 Emergency Power Off Button Turns power off in an emergency situation.

2 Display Screen Enables Operator to monitor power flow and meter readings, receive

3 Navigation Buttons Enables Operator to access menu screens and make selections.

Operation

reports, and execute operational procedures.

3.1.1 Operator Control Panel

The Operator Control Panel enables the operator to perform the following tasks:

• Obtain a quick indication of operational status:

• Is the critical bus OK?

• Is the UPS system OK?

• Is the battery available?

• Is the bypass line available?

• Monitor the power flow through the UPS system and monitor all meter readings:

• Is the critical load being supplied power from the UPS system or bypass?

• Are input, battery, and output voltage, frequency, and current readings at nominal levels?

• How much battery time is still available during an outage?

• Is the battery recharging after discharge?

• Execute operational procedures:

• Perform critical bus transfer/retransfer between the UPS and the bypass line.

• Start-up and shutdown the UPS.

• Shutdown the system instantly in the event of an emergency.

• Access status reports and history files:

• Obtain a complete listing of the present status of the UPS including input, output, and battery voltage, frequency, and current readings, and any alarms that may be present.

• Review a complete history report of all events leading up to and immediately after a fault condition.

• Examine an archive listing of all alarm conditions that have occurred over a period of time.

• Make adjustments to programmable parameters (access limited by Security Access function):

• Set the date and the time functions.

• Change the auto-dial phone number and the modem options.

• Select the number of auto-retransfer attempts.

• Make adjustments to the UPS output voltage before performing a manual load transfer.

Operation

3.1.2 Navigation Buttons

The Navigation Buttons are located below the Display Screen.

Figure 4 Navigation buttons

STARTUP / SHUTDOWN STATUS REPORTS CONFIGURATION

SELECT

MAIN MENU

DOWN

MANUAL TRANSFER

BATTERY MANAGEMENT

ALARM RESET

LARM

SILENCE

ESCAPE

The SELECT button is used to select a particular item from the options on the screen. When you press this button, the screen that is selected will be immediately displayed.

The UP and DOWN buttons are used to move the cursor around the screen in order to highlight appropriate selections.

The ALARM SILENCE button silences the audible alarm and discontinues the flashing of the alarm messages.

The ALARM RESET button clears a latching alarm after the alarm condition is corrected.

The ESCAPE button is used to exit the screen and return to the Mimic Display.

3.1.3 Rotary Switch

The Rotary Switch is located on the lower right side of the panel inside the cabinet. This switch provides single-point control of the UPS.

NOTE

Improper positioning of the rotary switch can result in unwanted actions. Therefore it is important to read the complete instructions before using this switch, and to follow Operator prompts on the display screen.

Figure 5 Rotary switch

Operation

The Rotary Switch has 3 positions:

• NORMAL: The Normal switch position is used under most operational conditions.

• BYPASS: The Bypass switch position directs the power flow through the Internal Bypass Circuit. The UPS module may be either on or off. If the UPS module is on and the batteries require charging, charging will take place.

• SERVICE: The Service switch position directs the load to the Internal Bypass Circuit so the UPS can be serviced.

NOTE

For purposes of this manual, assume that the rotary switch will always be in the NORMAL position.

NOTE

If the position of the rotary switch must be changed, as in servicing, it is imperative that the Operator observe the light in the corner of the Rotary Switch panel before making any change. The switch position may be changed only if the light is green. Never move the switch if the light is red. Instead, call the Liebert Global Services technician.

NOTE

The LED light is positioned in the lower left-hand corner.

3.2 Security Access and Passwords

Password protection is provided in the Npower UPS system to protect you from any unauthorized configuration of the system. A default password is installed on your system when you receive it.The default password is NPWR. It is important, however, that you enter your own secure password as soon as possible. The following procedure will enable you to do this.

1. From the MAIN MENU on the Display Screen, navigate to the primary CONFIGURATION Screen. It will look like the figure below.

Figure 6 Configuration screen

CONFIGURATION

SYSTEM RATINGS SYSTEM SETTINGS

FACTORY SETTINGS ALARM MASK

CUSTOMER ALARM INTERFACE

Operation

EXIT

2. Highlight USER SETTINGS using arrow keys, and press SELECT.

3. The USER SETTINGS screen will come up.

4. Bracket NEXT using arrow keys and press SELECT five times. This will take you to the sixth page of the USER SETTINGS screen.

Figure 7 User settings screen, page 6

USER SETTINGS

AUTO RESTART SETTING SYSTEM ACTIVE FILTER ENABLE ENABLED TEMPERATURE BATT. CB TRIP NO

CHANGE PASSWORD INTERRUPTED TRANSFER ENABLE DISABLE

PREV.

Highlight CHANGE PASSWORD. This action will bring up the PASSWORD screen. You must know the current password in order to change it. Next, you will be prompted to enter a new 4-digit password. The new password may contain letters from A through Z and/or digits from 1 through 9.

5. You now have 5 minutes to examine and configure password-protected screens.

6. After five minutes you must re-enter the password in order to unlock further password-protected screens.

CANCEL

SAVE & EXIT

NOTE

eac

The TIME and DATE of all password changes are logged in the event log.

3.3 Display Screens and Procedures

y Cy

The Operator Interface Display System of the Npower allows quick access to any screen the operator chooses. The default screen is the Mimic Display Screen.

MENU TREE

The figure below shows the primary screens that you can access through the Operator Interface Display System.

Figure 8 Menu tree

Operation

Main MenuMain MenuMain MenuMain Menu

Bypass Input Status

(Dual Input Only)

Input Status

Output Load Status

Battery Status

System Faults/ Alarms

Mimic / Display

Manual Transf. / Retransfer

Auto Startup

Manual Startup

User Shut Down

Startup / Shutdown

Instructions

InstructionsInstructionsInstructions

Battery Mgmt.

Battery

Batter Te st

Te st

Batter Equilizer

Battery Te mp

Compensation Charge

Batter

cle

Monitor

Batter

Time

Remaining

Status Reports

Confi

CalibrationCalibration

Event Log

Histor Log 1

Histor Log 2

stem

S Status

Clear Histor Logs

Clear Event Log

uration

System Ratings

System Settin

User Settin

Factory Settin

Alarm Mask

Customer Alarm Interface

NOTE

Any screens where changes in configuring, settings or data can be made (including all the Configuration screens) are password-protected.

Operation

Primary Screens

The Main Menu has eight primary screens. Please note that some screens have multiple pages because not all the information can fit on one page. To access the next page, highlight NEXT and press SELECT. To access the previous page, highlight PREV and press SELECT.

• Mimic Display. This graphic portrays the power flow through the UPS. Switch indications, system status, and alarm messages are all displayed on this screen. Detail screens can display input voltage and current readings, battery status, and load characteristics and alarm info.

• Status Reports. This display consists of three sub-menu selections: present status, history log and event log. These screens display data on the system's present and past performance. They also display information about any faults that have occurred in the system. Total operating hours are displayed here.

• Configuration. This screen displays the current configuration of the UPS system. It also enables the operator to reset the date, time, dial-out phone numbers and System Options. System Options include Temperature-Compensated Charging, Customer Alarm Definitions and Battery Load Test. The operator can view, but can not change, any of the settings unless the password is entered. See 3.2 - Security Access and Passwords for more information.

• Manual Transfer. This screen specifies all of the steps required to manually transfer the critical load between the UPS and the bypass source. Comparisons of the voltage, frequency, and phase synchronization of the UPS output and the bypass line are also illustrated to aid in the transfer or retransfer procedure.

• Startup and Shutdown Procedures. These screens list step-by-step procedures to start up UPS or to shut it down for maintenance or repairs. Screens include the following: Auto Startup, Manual Startup, and two types of Operator Shutdown procedures.

• Battery Management. These screens display information on battery self tests, battery equalization, and battery compensated charging. This enables the operator to immediately see the effects of load shedding on time remaining and to accurately assess his power resources. The battery equalize screen lets the operator change the battery equalize recharging mode from manual to automatic, and to observe or change the equalize time. Battery equalize charge voltage is higher than battery float (constant) charge voltage.

NOTE

Secondary Screens

The secondary screens show detailed information relating to the primary screens. These screens are illustrated below under each primary screen. Like the primary screens, the secondary screens may also consist of multiple pages. To get to the next page, highlight and Select the word NEXT. To return to the previous screen, highlight and Select the word PREV.

STATUS INFORMATION

Module status information is available on the display screen when the Control Power is ON, even when the UPS module is not operating. The same system status information is also available at local and remote terminals. See 3.3.4 - Status Reports for information on status reports and 3.5 - Com- munication Interfaces for information on Operator communication interfaces.

If a module display screen is blank, either power is not available, the Rectifier Input (RIB) circuit breaker (external to the UPS module) is open, or the Control Power is OFF. If power is available and a display is blank, contact Liebert Global Services (1-800-Liebert, or 1-800-543-2378).

Main Menu Screen

The Main Menu contains the primary menu selections that monitor and control the operation of the UPS. To access one of these screens, use the NAVIGATIONAL BUTTONS beneath the screen.

First, press the UP or DOWN button until the desired screen is highlighted. Then press the SELECT button.

From any screen, pushing the Escape button once will return you to the Mimic Screen.

Figure 9 Main menu screen

STARTUP / SHUTDOWN STATUS REPORTS CONFIGURATION

Operation

MAIN MENU

MANUAL TRANSFER BATTERY MANAGEMENT

3.3.1 Mimic Display Screen

From Main Menu move the highlighted cursor to MIMIC DISPLAY and press the Select button. This brings up the Mimic Display Screen.

The Mimic Display screen is the default screen on the Operator Display. It is a simplified block diagram showing an overall view of the power flow through the UPS system. Solid lines indicate power flow; white lines with thin black edges indicate that power is not flowing in that area. The following examples illustrate power flow under different conditions.

Figure 10 Monitor / mimic display screen example: normal power flow

MIMIC DISPLAY

RECT.

BATTERY

CHG

INV.

LOAD

SYS. STATUS

In this example, power is available from the normal and bypass sources, as well as from the battery. Notice that the switching devices are all closed except for the bypass switch at the top. The load is operating on conditioned power from the inverter. The battery is being charged by the rectifier. The static switch is operative and ready to respond to momentary demands for overload current.

Figure 11 Mimic display screen example: utility fail

Operation

RECT.

BATTERY

INV.

FAULTS

LOAD

DISCHG

In this example, we see that a utility failure has shut down both the normal and bypass power sources. The battery is connected and supplying power to the load.

MAIN MENU

MANUAL TRANSFER

STARTUP / SHUTDOWN STATUS REPORTS CONFIGURATION

Figure 12 Mimic display screen example: load on bypass, UPS module on and charging battery

BATTERY MANAGEMENT

MIMIC DISPLAY

RECT.

BATTERY

CHARGE

INV.

FAULTS / ALARMS

LOAD

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