Liebert 600T User Manual

Page 31

Wiring Connections

5. The UPS System Output Neutral is connected to one common point and solidly grounded per

requirements of the National Electrical Code. The ground connection inside the UPS SCC

cabinet may be required by the power wiring configuration at your site.

6. For Battery Cabinets:

DC power cables (and ground) from Battery Cabinet to UPS Module, and between Battery Cab-

inets. Observe polarity. DC power cables should be installed in matched pairs (positive and neg-

ative).

7. For remote battery, install DC power cables (and ground) from battery to Module Battery

Disconnect, and then to UPS Module DC bus. Observe polarity.

8. Module Battery Disconnect control wiring to UPS Module, and between Battery Cabinets if

applicable.

9. Control wiring from System Control Cabinet (SCC) to UPS modules. Wiring must be run in

individual separate steel conduit.

10. Power and control connections required for the Maintenance Bypass.

11. Power connections from SCC to critical load bus. Observe phase rotation.

12. Control wiring to Remote Monitor Panel, if used. Selected alarm messages are also available for

customer use through a set of contacts on a separate terminal board. Wiring must be run in

individual separate steel conduit.

13. Emergency Power Off control wiring (to SCC) must be run in separate steel conduit.

14. Communications wiring (to SCC) for terminals, site monitoring or for modem must be run in

separate steel conduit.

15. Any additional special wiring required at your site.

Abbreviations for Circuit Breakers

BFB

Bypass Feeder Breaker

BIB

Bypass Input Breaker

CB1

Module Input Breaker

CB2

Module Output Breaker

MBB

Maintenance Bypass Breaker

MBD

Module Battery Disconnect

MBFB

Maintenance Bypass Feeder Breaker

MIB

Maintenance Isolation Breaker

RIB

Rectifier Input Breaker

SBB

System Bypass Breaker

SBS

Static Bypass Switch

CAUTION

UPS bypass and system output neutral must be connected to only

one common point in the UPS system. This neutral line must be

grounded at the source.

NOTE

DC power and battery circuit breaker control cables are provided with some

Liebert-brand Battery Cabinets. Power cables are sized for interconnecting

Battery Cabinets. Field-supplied cabling might be required to connect

Battery Cabinets to the UPS module, depending on cabinet configuration

and layout.

DANGER

DO NOT MAKE ANY CONNECTIONS BETWEEN BATTERY TIERS

IN THE BATTERY CABINET. THESE CONNECTIONS WILL BE

MADE BY THE LIEBERT CUSTOMER SERVICE

REPRESENTATIVE DURING START-UP.