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Wiring Considerations
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7.3 Battery Wiring
The UPS may be supplied with battery cabinets or a rack-mounted battery system.
Power wiring to the battery cabinet connects positive, negative and ground power cables from the bat-
tery cabinet to the associated UPS. Connection of the UPS to the battery cabinet serves to both charge
and discharge the batteries (when needed). The battery disconnect (circuit breaker) requires a control
cable. Except for interconnect wiring between multiple battery cabinets, power and control cables are
field supplied. Refer to Battery Cabinet submittal drawings.
Call Liebert Global Services to schedule installation check-out, final battery intercell connections and
start-up.
!
WARNING
A battery intercell connection on each tier of the Liebert battery cabinet is disconnected for
safety during shipment. Do not complete these connections. A Liebert Global Services
representative will complete these connections as part of start-up. An improperly installed
unit can result in injury to personnel or damage to equipment.
!
CAUTION
Be sure polarity is correct when wiring the battery cabinet to the connected equipment
(positive to positive; negative to negative). If polarity is not correct, fuse failures or equipment
damage can result.
!
CAUTION
Cables between batteries and the UPS should be run in matched pairs,
positive-with-negative, within each conduit or cable run. Grouping
like-polarity cables together (i.e., positive-with-positive and
negative-with-negative) can cause stress or damage to the cables,
conduit or buswork.
NOTE
A Liebert Battery Specialist can perform a detailed inspection of the entire battery system to
ensure it meets current IEEE standards. This inspection service is recommended because
batteries are a critical part of the UPS system.