Liebert NX 10kVA, NX 15kVA, NX 20kVA, NX 30kVA Installation Manual
NX™
POWER AVAILABILITY
INSTALLATION MANUAL
10-30kVA
208V, 60Hz
CONTACTING LIEBERT FOR SUPPORT
To contact Liebert Global Services for information or repair service in the United States, call
1-800-LIEBERT (1-800-543-2378). Liebert Global Services offers a complete range of start-up
services, repair services, preventive maintenance plans and service contracts.
For repair or maintenance service outside the 48 contiguous United States, contact Liebert Global
Services, if available in your area. For areas not covered by Liebert Global Services, the authorized
distributor is responsible for providing qualified, factory-authorized service.
For LGS to assist you promptly, please have the following information available:
Tag Number___________________________________________________________________
Site ID________________________________________________________________________
Part numbers: _________________________________________________________________
Serial numbers:________________________________________________________________
Rating: _______________________________________________________________________
Date purchased: _______________________________________________________________
Date installed:_________________________________________________________________
Location: ______________________________________________________________________
TABLE OF CONTENTS
CONTACTING LIEBERT FOR SUPPORT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . INSIDE FRONT COVER
IMPORTANT SAFETY INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
GLOSSARY OF SYMBOLS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.0 INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
1.1 External Inspections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.2 Internal Inspections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.2.1 Storing for Delayed Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.3 Preliminary Checks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.3.1 Identification. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.4 UPS Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.4.1 Environmental Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.5 Mechanical Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.5.1 System Composition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.5.2 10-30kVA UPS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.5.3 Positioning the UPS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.5.4 Clearances. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.5.5 Floor Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.5.6 Cable Entry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.5.7 Optional Cabinets. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.0 ELECTRICAL CONNECTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
2.1 Power Cabling. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.1.1 Cable Rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.1.2 UPS Input Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.1.3 Cabling Guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.1.4 Cable Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2.1.5 Safety Ground . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
2.1.6 Protective Devices. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
2.1.7 Cabling Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
2.2 Control Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
2.2.1 Monitor Board Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
2.3 Dry Contacts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
2.3.1 Input Dry Contacts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
2.3.2 Maintenance Bypass Cabinet Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
2.3.3 BCB Box Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
2.3.4 Output Dry Contacts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
2.3.5 EPO Input—Optional . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
2.4 UPS Startup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
2.4.1 Startup Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
2.5 Switching the UPS from Normal to Maintenance Bypass . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
2.6 Powering Down the UPS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
i
3.0 BATTERY INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
3.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
3.2 Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
3.3 UPS Batteries . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
3.4 Temperature Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
3.5 Battery Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
3.5.1 Battery Undervoltage Pre-Warning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
3.5.2 Battery End-of-Discharge (EOD) Protection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
3.5.3 Battery Fuse-Blow Warning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
3.6 External Battery Cabinet Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
3.6.1 Fitting the Batteries. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
3.6.2 Connecting the Batteries . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
3.7 Matching Battery Cabinets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
3.7.1 Installation Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
3.7.2 Connecting the Battery Cabinet to the UPS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
3.8 Non-Standard Batteries. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
4.0 MAINTENANCE BYPASS CABINET . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
4.1 Bypass Switch. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
4.2 UPS Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
4.3 Bypass Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
4.4 Maintenance Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
4.5 Mounting the Cabinet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
4.6 Cable Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
4.6.1 Wiring Preparation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
4.6.2 Power Cable Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
4.6.3 Input/Output Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
4.7 Bolting Cabinets Together . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
4.8 Operating Procedures. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
4.8.1 Startup and Initialization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
4.8.2 Shutting Down the UPS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
4.8.3 Transferring System from UPS to Maintenance Bypass Operation . . . . . . . . . . . . . . . . . . . . 31
4.8.4 Transfer the System from Maintenance Bypass to UPS Operation . . . . . . . . . . . . . . . . . . . . 31
4.8.5 Transfer the System from UPS Operation to Maintenance Bypass . . . . . . . . . . . . . . . . . . . . 31
4.9 Input and Output Transformer Voltages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
5.0 OPTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33
5.1 Dual Bus Synchronizer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
5.1.1 Performance Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
5.1.2 DBS Cable and Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
ii
5.2 Configuring Parallel System Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
5.2.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
5.2.2 Conditions for Parallel System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
5.2.3 Features of Parallel System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
5.2.4 Operating Principles. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
5.2.5 Operation Modes Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
5.2.6 Intermodule Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
5.3 Installing Parallel System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
5.3.1 Cabinet Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
5.3.2 Preliminary Checks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
5.3.3 Protective Devices. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
5.3.4 Power Cables. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
5.3.5 Parallel Control Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
5.4 Commissioning a Parallel System. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
5.5 Parallel System Startup. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
5.5.1 Emergency Power Off (EPO) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
5.6 Battery Circuit Breaker Box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
6.0 SPECIFICATIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41
6.1 Conformity and Standards. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
6.2 UPS Environmental . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
6.3 UPS Mechanical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
6.4 UPS Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
6.4.1 Battery Manufacturers and Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
6.4.2 Input Rectifier. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
6.4.3 DC Intermediate Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
6.4.4 Inverter Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
6.4.5 Bypass Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
7.0 INSTALLATION DRAWINGS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
8.0 S
8.1 Lug Size and Torque Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
8.2 Cable Lengths: Floor to Connection Point Inside UPS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
PECIFICATIONS AND TECHNICAL DATA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .53
FIGURES
Figure 1 Cabinet arrangement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Figure 2 Single module block diagram (dual input configuration) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Figure 3 Input busbars . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Figure 4 Battery fuses and connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Figure 5 Ground and neutral busbar connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Figure 6 Monitor board U2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Figure 7 Auxiliary terminal block detail . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Figure 8 Input dry contacts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Figure 9 Output dry contacts and EPO wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Figure 10 Narrow battery cabinet, 27 in. (690mm) - rear view. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
iii
Figure 11 Wide battery cabinet, 57 in. (1488mm) - front view . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Figure 12 Battery cabinet—details . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Figure 13 Battery tray and supports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Figure 14 Single UPS with external Maintenance Bypass Cabinet—typical configuration . . . . . . . . . . . . . 27
Figure 15 Maintenance Bypass Cabinet—access plate removed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Figure 16 Maintenance Bypass Cabinet wiring access panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Figure 17 Dry contact for X3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Figure 18 DBS cable connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Figure 19 1+1 system block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Figure 20 Connecting '1+1' system parallel control cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Figure 21 Connecting EPO push button . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Figure 22 Battery circuit breaker box connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Figure 23 Dimensional view- front and left side views . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Figure 24 Dimensions continued—top and bottom views . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Figure 25 Main components—typical unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Figure 26 Cable connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Figure 27 Location of internal batteries . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Figure 28 Battery connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Figure 29 Electrical connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Figure 30 Battery cabinet interconnection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Figure 31 Maintenance Bypass interconnection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
TABLES
Table 1 Input dry contacts at X3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Table 2 Maintenance bypass cabinet interface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Table 3 BCB box interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Table 4 Output dry contact relays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Table 5 EPO input contact relays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Table 6 Key to UPS control cable connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Table 7 Available battery circuit breaker boxes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Table 8 Environmental characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Table 9 Mechanical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Table 10 Approved batteries . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Table 11 Rectifier input power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Table 12 DC intermediate circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Table 13 Inverter output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Table 14 Linear load derating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Table 15 Bypass input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Table 16 Liebert -supplied interconnect wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Table 17 Liebert-supplied interconnect wiring for Maintenance Bypass Cabinet . . . . . . . . . . . . . . . . . . . . 52
Table 18 Torque specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Table 19 Battery torque rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Table 20 UPS terminal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
Table 21 Maintenance Bypass Cabinet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Table 22 Maintenance Bypass Cabinet lug sizes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
Table 23 Maintenance Bypass Cabinet weights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
Table 24 Maintenance Bypass Cabinet dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
Table 25 Distance to connection points on the NX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
Table 26 Battery cabinet physical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
iv
IMPORTANT SAFETY INSTRUCTIONS
SAVE THESE INSTRUCTIONS
This manual contains important instructions that should be followed during installation of your
Liebert NX™ UPS and batteries.
Read this manual thoroughly, paying special attention to the sections that apply to your installation,
before working with the UPS. Retain this manual for use by installing personnel.
WARNING
!
Exercise extreme care when handling UPS cabinets to avoid equipment damage or injury to
personnel. The UPS module weight ranges from 850 to 1400 lb. (386 to 635kg).
Determine unit weight and locate center of gravity symbols
before handling the UPS. Test lift and balance the cabinet
before transporting. Maintain minimum tilt from vertical at all times.
Battery manufacturers supply details of the necessary precautions to be observed when
working on, or in the vicinity of, a large bank of battery cells. These precautions should be
followed implicitly at all times.
Follow all battery safety precautions when installing, charging or servicing batteries. In
addition to the hazard of electric shock, gas produced by batteries can be explosive and
sulfuric acid can cause severe burns. When connected, the nominal battery voltage is 324VDC
and is potentially lethal.
In case of fire involving electrical equipment, use only carbon dioxide fire extinguishers or
those approved for use in fighting electrical fires.
Extreme caution is required when performing maintenance.
Be constantly aware that the UPS system contains high DC as well as AC voltages.
Check for voltage with both AC and DC voltmeters prior to making contact.
WARNING
!
As with other types of high power equipment, dangerous voltages are present within the UPS
and battery enclosure. The risk of contact with these voltages is minimized as the live
component parts are housed behind a hinged, lockable door. Further internal safety screens
make the equipment protected to IP20 standards.
No risk exists to any personnel when operating the equipment in the normal manner,
following the recommended operating procedures.
All equipment maintenance and servicing procedures involve internal access and should be
carried out only by trained personnel.
WARNING
!
High ground leakage current: Ground connection is essential before connecting the input
supply.
This equipment must be grounded in accordance with local electrical codes.
Maximum load must not exceed that shown on the UPS rating label.
1
CAUTION
!
This equipment is fitted with RFI suppression filters.
Ground leakage current exceeds 3.5 mA and is less than 1000 mA.
Transient and steady-state ground leakage currents, which may occur when starting the
equipment, should be taken into account when selecting instantaneous residual current
circuit breakers (RCCBs) or residual current devices (RCDs).
RCCBs must be selected sensitive to DC unidirectional pulses (Class A) and insensitive to
transient current pulses.
Note also that the ground leakage currents of the load will be carried by this RCCB or RCD.
WARNING
!
Under typical operation and with all UPS doors closed, only normal safety precautions are
necessary. The area around the UPS system should be kept free of puddles of water, excess
moisture and debris.
Special safety precautions are required for procedures involving handling, installation and
maintenance of the UPS system and the battery. Observe all safety precautions in this
manual before handling or installing the UPS system. Observe all precautions in the
Operation and Maintenance Manual, before as well as during performance of all maintenance
procedures. Observe all battery safety precautions before working on or near the battery.
This equipment contains several circuits that are energized with high voltage. Only
test equipment designed for troubleshooting should be used. This is particularly true for
oscilloscopes. Always check with an AC and DC voltmeter to ensure safety before making
contact or using tools. Even when the power is turned Off, dangerously high electric charges
may exist within the UPS.
All power and control wiring should be installed by a qualified electrician. All power
and control wiring must comply with the NEC and applicable local codes.
ONLY qualified service personnel should perform maintenance on the UPS system.
When performing maintenance with any part of the equipment under power, service
personnel and test equipment should be standing on rubber mats. The service personnel
should wear insulating shoes for isolation from direct contact with the floor (earth ground).
Never work alone, even if all power is removed from the equipment. A second person should
be standing by to assist and summon help in case an accident should occur.
CAUTION
!
This unit complies with the limits for a Class A digital device, pursuant to Part 15 Subpart J
of the FCC rules. These limits provide reasonable protection against harmful interference in a
commercial environment. This unit generates, uses and radiates radio frequency energy and,
if not installed and used in accordance with this instruction manual, may cause harmful
interference to radio communications. This unit is not designed for use in a residential area.
Operation of this unit in a residential area may cause harmful interference that the user must
correct at his own expense.
Battery Cabinet Precautions
The following warning applies to all battery cabinets supplied with UPS systems. Additional warnings and cautions applicable to battery cabinets may be found in 3.0 - Battery Installation.
WARNING
!
Internal battery strapping must be verified by manufacturer prior to moving a battery cabinet
(after initial installation).
• Battery cabinets contain non-spillable batteries.
• Keep units upright.
• Do not stack.
• Do not tilt.
Failure to heed this warning could result in smoke, fire or electric hazard.
Call 1-800-LIEBERT before moving battery cabinets (after initial installation).
2
GLOSSARY OF SYMBOLS
Risk of electrical shock
!
R
i
-
PbH2SO4
Indicates caution followed by important instructions
AC input
AC output
Requests the user to consult the manual
+
Indicates the unit contains a valve-regulated lead acid battery
Recycle
DC voltage
Equipment grounding conductor
Bonded to ground
AC voltage
3
1.0 INSTALLATION
The Liebert NX™ UPS is designed primarily for telecommunications and data processing applications. Liebert Corporation neither recommends nor knowingly sells this product for use with life support and other designated “critical” devices.
This section describes the NX’s environmental requirements and mechanical considerations that
must be taken into account when planning the positioning and cabling of the UPS equipment.
Because every site is unique, this section presents a guide to general procedures and practices that
should be observed by the installing engineer, rather than step-by-step installation instructions.
WARNING
!
Do not apply electrical power to the UPS equipment before the arrival of the commissioning
engineer.
WARNING
!
The UPS equipment should be installed by a qualified engineer in accordance with the
information contained in this section.
WARNING
!
Special care should be taken when working with the batteries associated with this equipment.
When connected together, the nominal battery voltage is 324 VDC and is potentially lethal.
• Eye protection should be worn to prevent injury from accidental electrical arcs.
• Remove rings, watches and all metal objects.
• Only use tools with insulated handles.
• Wear rubber gloves.
If a battery leaks electrolyte or is otherwise physically damaged, it must be replaced, stored in
a container resistant to sulfuric acid and disposed of in accordance with local regulations.
If electrolyte comes into contact with skin, the affected area should be washed immediately
with large amounts of water.
Installation
NOTE
The NX UPS can be used in TN utility system.
1.1 External Inspections
1. While the UPS system is still on the truck, inspect the equipment and shipping container(s) for
any signs of damage or mishandling. Do not attempt to install the system if damage is apparent.
If any damage is noted, file a damage claim with the shipping agency within 24 hours and contact
Liebert Global Services at 1-800-LIEBERT to inform them of the damage claim and the condition
of the equipment.
2. Compare the contents of the shipment with the bill of lading. Report any missing items to the
carrier and your local Liebert representative immediately.
1.2 Internal Inspections
1. Remove any packaging material, then visually examine the UPS and battery equipment for
transit damage, both internally and externally. Report any such damage to the shipper and to
Liebert immediately.
2. Check the nameplate inside the cabinet door to verify that the model number and rating
correspond to the ones specified. Record the model number and serial number in the front of this
installation manual. This information is necessary should service be required.
3. Check for loose connections or unsecured components in the cabinet.
4. Check for shipping damage to internal components.
4
1.2.1 Storing for Delayed Installation
If the equipment will not be installed immediately, it must be stored indoors where the humidity is no
higher than 90% and the temperature is no higher than 104°F (40°C). The storage area must protect
the NX from excessive moisture (see 5.1 - Dual Bus Synchronizer).
CAUTION
!
If the UPS must remain disconnected from power for more than six (6) months, the battery
must be recharged before use. To charge the batteries, the unit must be connected to utility
power and started up—the charger operates only while the NX is operating.
CAUTION
!
When batteries are installed in the UPS or are cabinet-mounted adjacent to the UPS unit, the
battery—not the UPS—dictates the designed maximum ambient temperature.
1.3 Preliminary Checks
1.3.1 Identification
The equipment supplied has an identification tag on the back of the main door listing the type and
size of the UPS.
1.4 UPS Location
1.4.1 Environmental Considerations
Before installing the NX, verify that the UPS room satisfies the environmental conditions stipulated
in 5.1 - Dual Bus Synchronizer, paying particular attention to the ambient temperature and air
exchange system.
The UPS unit should be installed in a cool, dry, clean-air environment with adequate ventilation to
keep the ambient temperature within the specified operating range 32°F to 104°F (0°C to 40°C).
All NX models are cooled by internal fans. Cooling air enters the devices through ventilation grids at
various points on the cabinet and is released through grids on the top of the unit. To permit proper
airflow and prevent overheating or malfunctioning, do NOT cover the ventilation openings or allow
fans or equipment to blow air down onto the NX.
If necessary, a system of extractor fans should be installed to aid cooling-air flow If the unit is to be
operated in an environment that is not clean-air, a suitable air filtration system should be used to
ensure the unit works properly.
See Table 9 for details on heat dissipation.
Installation
CAUTION
!
When batteries are installed in the UPS or are cabinet-mounted adjacent to the UPS unit, the
battery—not the UPS—dictates the designed maximum ambient temperature.
Battery Location
Temperature is a major factor in determining battery life and capacity. Battery manufacturers recommend an operating temperature of 77°F (25°C). Ambient temperatures warmer than this reduce battery life; temperatures below this reduces battery capacity. In a typical installation, battery
temperature should be maintained between 68°F and 86°F (20-30°C). Batteries should be placed
where there are no main heat sources or air inlets to prevent portions of batteries from being either
much warmer or much cooler than other parts of the batteries.
1.5 Mechanical Considerations
The NX is constructed with a steel frame and removable panels. Top and side panels are secured to
the chassis by screws. The doors may be opened for access to power connections bars, auxiliary terminals blocks and power switches.
The UPS comes with an operator control panel, which provides basic operational status and alarm
information. The cabinet houses both the power components and the internal batteries. Cooling is
provided by internal fans. The unit sits on four casters. Adjustable leveling feet are provided to prevent the UPS from moving once it has been moved to its final position.
5
1.5.1 System Composition
A UPS system can comprise a number of equipment cabinets, depending on the individual system
design requirements—e.g., UPS cabinet and External Bypass cabinet. In general, all cabinets used
will be the same height and are designed to be positioned side-by-side to form an aesthetically appealing equipment suite.
Refer to 7.0 - Installation Drawings for the positioning of the cabinets described below.
1.5.2 10-30kVA UPS
The 10-30kVA NX consists of a single cabinet housing the UPS and its internal battery string.
An extended battery option kit is available. This comprises a separate cabinet containing additional
batteries that can be connected to the UPS to increase its total battery capacity (see 3.6 - External
Battery Cabinet Installation).
Maintenance Bypass-Transformer Cabinet options are available to:
• Provide an external wraparound maintenance bypass switch
• Change input voltage
• Change output voltage
• Provide three-wire input and four-wire output
• Provide load neutral isolation
For details on installing a Maintenance Bypass Cabinet or Transformer Cabinet, see 7.0 - Installa-
tion Drawings.
Installation
1.5.3 Positioning the UPS
Choose a location for the UPS that offers:
• Easy connection to inputs, outputs and auxiliary equipment
• Enough space to service the UPS
• Air circulation sufficient to expel heat produced by UPS
• Protection against moisture and excessive humidity
• Protection against dust and other particulate matter
• Compliance with fire prevention regulations and practices
• Operating environment temperature of 68°F to 86°F (20°C to 30°C) for maximum battery efficiency
Considerations in Moving the NX
Ensure that the UPS weight is within the designated surface weight loading (lb./ft2 or kg/cm2) of any
handling equipment. See Table 9 for weights of various units.
To move the UPS and optional battery cabinets:
• The NX may be rolled on its casters when moving the unit a short distance. For longer distances,
move the UPS with a forklift or similar equipment to ease the relocation and to reduce vibration.
The optional battery cabinets should be moved with a forklift or similar equipment.
WARNING
!
Ensure that any equipment that will be used to move the NX has sufficient lifting capacity.
The NX weight ranges from 850 to 1400 lb. (386 to 635kg). See Table 9 for details. The UPS
presents a tipping hazard. Do not tilt the NX further than 15 degrees from vertical.
The UPS is fitted with casters—take care to prevent movement when unbolting the
equipment from its shipping pallet. Ensure adequate personnel and lifting equipment are
available when taking the NX off its shipping pallet. Do not tilt the unit more than 15 degrees
from center.
6
WARNING
!
The casters are strong enough for movement across even surfaces only. Casters may fail if
they are subjected to shock loading, such as being dropped or rolled over holes in the floor or
obstructions. Such failure may cause the unit to tip over, injuring personnel and damaging
the equipment.
Care must be taken when maneuvering units fitted with batteries. Keep such moves to a
minimum. For further information, see Battery Cabinet Precautions on page 2.
Leveling in Final Position
When the equipment has been finally positioned, ensure that the adjustable leveling feet are set so
that the UPS will remain stationary and stable (see 7.0 - Installation Drawings).
1.5.4 Clearances
There are no ventilation grilles on the sides or rear of the UPS. The sides must be accessible during
installation. After installation, the unit may be placed with the rear against a wall and optional cabinets on either side.
To enable routine tightening of power terminations within the UPS, make sure there is sufficient
clearance in front of the NX to permit free passage of personnel with the door fully opened.
Leave a minimum of 2 ft. (610mm) between the top of the UPS and the ceiling to permit adequate air
circulation above the unit. Liebert recommends against using air conditioning or other systems that
blow air onto the top of the unit.
Installation
1.5.5 Floor Installation
The diagrams in 7.0 - Installation Drawings show the location of holes in the base plate for bolting
the equipment to the floor. An optional anchoring kit is available. For information, see your local Liebert representative.
If the equipment is to be placed on a raised floor, it should be mounted on a pedestal that will support
the equipment point loading. Refer to the bottom view in Figure 23 to design this pedestal.
1.5.6 Cable Entry
Cables can enter the NX from the top, through the bottom or through the left side. Cable entry is
made possible by removing the left-side panel or a metal plate attached to the top or bottom of the
UPS.
Connecting cables to the NX requires that the UPS be accessible from the left side to allow personnel
to complete the connections and make necessary adjustments. After installation is complete, the NX
may be serviced from the front.
NOTE
When installing the UPS, the customer must provide a disconnect at the output of the UPS.
7
1.5.7 Optional Cabinets
If your NX installation includes a Maintenance Bypass Cabinet, the NX must be positioned to allow
the Maintenance Bypass Cabinet to be bolted to left side of the NX (see Figure 1). Cables from the
Maintenance Bypass Cabinet must be brought through the bottom side of the NX for connection.
The Maintenance Bypass Cabinet must be cabled and bolted to the NX before the UPS and bypass
cabinet are moved into their final position. Connect the input wiring to the Maintenance Bypass Cabinet ONLY after the units are connected and positioned.
Battery cabinets may be bolted to either side of the NX, unless used in configurations that include a
Maintenance Bypass Cabinet; refer to 1.5.7 - Optional Cabinets.
Figure 1 Cabinet arrangement
Installation
ALL UNITS VIEWED FROM ABOVE
Liebert
Maintenance
Bypass
Cabinet
NX connected only to MBC
(MBC must be on left side of the NX)
NX
(Battery Cabinets may be on either side of the NX)
Maintenance
Bypass
Cabinet
NX connected to Maintenance Bypass Cabinet and Battery Cabinets
(MBC must be on left side of the NX)
(Battery Cabinets may be on either side of the NX)
Liebert
NX
Battery
Cabinet
NX connected to Battery Cabinets
Liebert
NX
Battery
Cabinet
Battery
Cabinet
Battery
Cabinet
8
2.0 ELECTRICAL CONNECTIONS
The UPS requires both power and control cabling once it has been mechanically installed. All control
cables must run separate from power cables in metal conduits or metal ducts that are electrically
bonded to the metalwork of the cabinets to which they are connected.
WARNING
!
Before connecting input power to the NX, ensure that you are aware of the location and
operation of the overcurrent protection devices that connect the UPS input/bypass supply to
the power distribution panel.
De-energize and lockout or tagout all incoming high- and low-voltage power circuits before
installing cables or making any electrical connections.
For cable entry information, refer to 1.5.6 - Cable Entry.
2.1 Power Cabling
2.1.1 Cable Rating
The main factors affecting the choice and size of cable are voltage, current (also taking into account
overcurrent), room temperature and conditions of installation of the cable.
The power cables of the system must be sized with respect to the following description:
Electrical Connections
• UPS input cables - The UPS input cables must be sized for the maximum input current, including the maximum battery recharge current, given in Table 20, with respect to the unit rating and
the input AC voltage.
• UPS bypass and output cables - The bypass and output cables must be sized for the nominal
output current, given in Table 20, with respect to the unit rating and the output AC voltage.
• Battery cables - Each UPS unit has its own internal batteries factory-wired. If connecting an
external battery cabinet, the battery cables must be sized for the battery discharge current at the
end-of-discharge voltage, as given in Table 20, with respect to the unit rating.
NOTE
Table 20 gives nominal currents for determining the size of UPS power cables. Other
important factors to consider include cable route length and coordination with protective
devices.
The power cables can be sized to suit the UPS unit rating according to Table 20.
Lug Size and Torque Requirements
Refer to Table 18 for lug size and torque requirements.
9
2.1.2 UPS Input Configuration
Figure 2 illustrates the NX in a split bypass (dual-input) configuration. In this configuration the
Static Bypass and the Maintenance Bypass lines are supplied from a separate feed from the Main
input. Both sources must be protected externally with properly sized protective devices. By default,
the unit ships with internal links installed between the Bypass input and Main input (Single Input
configuration). To wire the unit as a dual input UPS, remove the links and wire the bypass to the
input bus bars, then wire the Main input directly to CB1 (see Figure 3).
Figure 2 Single module block diagram (dual input configuration)
Electrical Connections
Maintenance Bypass
Bypass Input
AC Utility Input
CB1
Neutral Wire
Discharge
Battery
2.1.3 Cabling Guidelines
The following are guidelines only and are superseded by local regulations and codes of practice where
applicable.
1. Take special care when determining the size of the neutral cable, as current circulating on the
neutral cable may be greater than nominal current in the case of non-linear loads. Refer to the
values in 6.4 - UPS Electrical Characteristics.
2. The ground conductor should be sized according to such factors as the fault rating, cable lengths
and type of protection. The ground cable connecting the UPS to the main ground system must
follow the most direct route possible.
3. Consider using paralleled smaller cables for heavy currents—this can ease installation.
4. When sizing battery cables, a maximum voltage drop of 4VDC is permissible at the current
ratings in Table 20. For terminal connection sizing, see Table 20.
5. In most installations, especially parallel multi-module systems, the load equipment is connected
to a distribution network of individually protected busbars fed by the UPS output, rather than
connected directly to the UPS itself. When this is the case, the UPS output cables can be rated to
suit the individual distribution network demands rather than being fully load-rated.
SW1/D
SW1/C
Contactor
Rectifier
Inverter
Battery
Charger
Static Switch
Contactor
UPS Output
SW1/A
Neutral Wire
SW1/B
NOTE
If more load is added to the distribution panel, the unit’s cabling must be resized.
6. When laying power cables, do not form coils; this will help avoid increasing formation of
electromagnetic interference.
NOTE
Left-side access is required when making power connections. Cable connections must be made
before a cabinet is attached to the left side of the NX or before the UPS is placed where another
obstruction, such as a wall, is against the NX’s the left side.
10
2.1.4 Cable Connections
The rectifier input, bypass and output are accessible from the left side of the unit for installation. All
require lug type terminations. They are connected to busbars on the left side of the NX and below the
switch, as shown in Figure 3. These busbars are accessible when the left side panel is removed. Busbars to connect external batteries are accessible from the front of the UPS.
NOTE
External battery connection access requires removal of a protective panel on the lower front of
the UPS to the left of the bottom two battery shelves.
Figure 3 Input busbars
Electrical Connections
Remove these links
for dual input
configuration and
wire UPS Main input
directly to CB1
Output Busbars
(Phases are
indicated by
letters below the
bars)
CB
OUTPUT BYPASS
The internal batteries are connected with Anderson connectors inside the battery compartment. The
batteries are connected to fuses to protect the NX and connected equipment (see Figure 4).
Figure 4 Battery fuses and connections
Rectifier Input
Busbars
(Phases are
indicated by
letters below the
bars)
ACBA
Internal battery input
connections
150A 500V AC/DC
B
Bussmann
MADE IN USA
11
150A 500V AC/DC
B
Bussmann
MADE IN USA
Battery fuses
(fuses are behind
access plate on
front of UPS; see
Note on page 11)
2.1.5 Safety Ground
The safety ground busbar is located below the neutral input and output busbars as shown in
Figure 5 below. The safety ground cable must be connected to the ground busbar and bonded to each
cabinet in the system.
All cabinets and cable conduit should be grounded in accordance with local regulations.
WARNING
!
Failure to follow proper grounding procedures can result in electric shock hazard to personnel
or the risk of fire, should a ground fault occur.
NOTE
Proper grounding significantly reduces problems in systems caused by electromagnetic
interference.
NOTE
The ground and neutral busbars are accessible when the left protective cover plate is removed.
Cable connections must be made before a cabinet is attached to the left side of the NX or before
the UPS is placed where another obstruction, such as a wall, is against the NX’s the left side.
Figure 5 Ground and neutral busbar connections
Output neutral
busbar
Electrical Connections
Ground
busbar
2.1.6 Protective Devices
For safety, it is necessary to install circuit breakers in the input AC supply and external battery battery cabinets, external to the UPS system. Given that every installation has its own characteristics,
this section provides guidelines for qualified installation engineers with knowledge of operating practices, regulatory standards and the equipment to be installed.
UPS Rectifier and Bypass Input Supply
• Protection from excessive overcurrents and short circuits in power supply input
External overcurrent protection for the AC output circuit is to be provided. See 6.4 - UPS Elec-
trical Characteristics and Table 11 for overload capacity.
High-speed fuses and SCRs are used for internal battery circuit overcurrent protection. When an
external battery supply is used, overcurrent protection for the battery circuit is to be provided by
the customer.
• Dual Input
When wiring the UPS with dual inputs, the Rectifier input and the Bypass input must be protected separately. Size the breakers according to the input currents shown in Table 20.
OUTPUT
NEUTRAL
INPUT
NEUTRAL
Input neutral
busbar
System Output
When using an external distribution panel for load distribution, the output neutral and input neutral
must be separated at the input to the UPS.
12
2.1.7 Cabling Procedure
CAUTION
!
The operations described in this section must be performed by authorized electricians or
qualified technical personnel. If you have any difficulties, contact your local Liebert
representative or Liebert Global Services.
NOTE
Hydraulic pressure pliers, combinative tools and piston ring pliers should be used to connect
AC wiring.
Once the equipment has been positioned and secured for operation, and the battery and ground collars have been connected (see 2.1.4 - Cable Connections), connect the power cables as described
below. (Study the reference drawing in 7.0 - Installation Drawings.)
1. Verify that all incoming high and low voltage power circuits are de-energized and locked out or
tagged out before installing cables or making any electrical connections.
2. Remove the left side panel to gain access to the connections bars.
3. Connect the safety ground and any necessary bonding ground cables to the copper ground busbar
located on the bottom of the equipment below the power connections. All cabinets in the UPS
must be connected to the user’s ground connection.
NOTE
The grounding and neutral bonding arrangement must comply with the National Electrical
Code and all applicable local codes.
Electrical Connections
4. Identify and make power connections with incoming cables according to Steps 5 through 11.
Common Input Connections
5. For common bypass and rectifier inputs, connect the AC input supply cables between the power
distribution panel and the UPS input busbars (A-B-C terminals) and tighten the connections to
44 lb-in. (5 N-m) (M6 bolt).
6. The input neutral cable must be connected to the input neutral busbar (N). See Figure 5.
Dual Input Connections
7. For bypass connect the AC input supply cables between the power distribution panel and the UPS
input busbars (A-B-C terminals) and tighten the connections to 44 lb-in. (5 N-m) (M6 bolt).
8. For Rectifier Input connect AC input supply cables between the power distribution panel and the
UPS input circuit breaker (A-B-C terminals)
9. The bypass input neutral cable must be connected to the input neutral busbar (N). See Figure 5.
Output System Connections—Ensure Correct Phase Rotation
10. Connect the system output cables between the UPS output busbars (A-B-C N terminals) and the
critical load and tighten the connections to 44 lb-in. (5 N-m) (M6 bolt).
WARNING
!
If the load equipment will not be ready to accept power on the arrival of the commissioning
engineer, then ensure that the system output cables are safely isolated.
Internal UPS Battery Connections
The UPS internal batteries will be connected at the factory, EXCEPT the Anderson connections
between the shelves and to the fuses.
WARNING
!
The DC bus is live when this internal battery connection is made. This connection is to be
performed ONLY by Liebert Global Services at startup.
Observe the battery cable polarity. Be sure that the battery connector is made with the correct polarity.
11. Refit all protective covers removed for cable installation
13
2.2 Control Cables
2.2.1 Monitor Board Features
Based on your site’s specific needs, the UPS may require auxiliary connections to manage the battery
system (external battery circuit breaker, battery temperature sensor), communicate with a personal
computer or provide alarm signaling to external devices or for Remote Emergency Power Off (REPO).
The monitor board, arranged for this purpose, is located on the rear of the operator access door. The
main features are:
• Input and Output dry contacts signal (one pair of contacts of relay)
• Emergency Power Off control (EPO)
• Environmental parameter input interface
• User communication (for data setting and user background monitor)
• Intellislot™ interface
• Modem interface
• Temperature detect interface
Figure 6 shows the relationship and connection between the monitoring (U2) board and other boards
in the UPS.
Figure 6 Monitor board U2
Electrical Connections
M5
Auxiliary Power
Figure 7 Auxiliary terminal block detail
J8
LCD
J2
U1
DSP Control
U2
Monitor Board
X1
User Interface
Board
J3
K1
Key & LED Board
Parallel Logic
J1
M3
Board
J22
J23
J12
J9
J15
J16
X7
X6
PWR
MODEM
SNMP CARD
X5
J13 J21 J25 J28 J4 J26 J30 J10
BFP INV ACF EPO Dry in MBC BCB
X4
X2
X3
14
Intellislot 2
Intellislot 1
Intellislot 3
J17
X4
X4
J24
NOTE: The black square (!)
on each slot indicates Pin 1.
2.3 Dry Contacts
The UPS provides input dry contacts and output dry contacts.
2.3.1 Input Dry Contacts
There are several input dry contacts at the X3 slot.
Figure 8 Input dry contacts
Table 1 Input dry contacts at X3
Position Name Description
J4.1 ENV
J4.2 BtG Battery Ground Fault Detection (N.C.)
J4.3 GEN
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.
3
1,2
Electrical Connections
Battery Room Alarm (N.C.)
Generator Join Detection (N.O.)
2.3.2 Maintenance Bypass Cabinet Interface
J26 and J30 are the MBC interface.
Table 2 Maintenance bypass cabinet interface
Position Name Description
J26.1 T_IT
J26.2 AUX_I Reserved
J26.3 +12V +12V Power
J26.4 GND Power Ground
J30.1 FUSE Reserved
J30.2 F_FAN Fan Fail Alarm (N.C.)
J30.3 T_OT
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 16-20AWG stranded.
1
Input transformer over temperature (N.C.)
1
Output Transformer Overtemperature (N.C.)
15
Loading...