Liebert 600T - Manual (Page 31)

Wiring Connections 25
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.