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Battery Installation
24
Figure 12 Battery tray and supports
3.3.4 Connecting the Battery Cabinet to the UPS
After the battery cabinet equipment has been positioned and secured for operation and the batteries
have been connected, connect the power cables as described below. (See Figure 34.)
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 UPS front protective cover to gain access to the equipment ground busbar.
3. Connect the safety ground and any necessary bonding ground cables to the copper ground busbar.
(example: UPS located on the bottom of the equipment below the power connections).
All cabinets in the UPS system must be connected to the user's ground connection.
4. Connect the system battery cables. Be sure that the battery connections are made with the right
polarity, and tighten the connections to 44 lb-in. (5 N-m) (M6 Bolt). Do not close the battery circuit
breaker before the equipment has been commissioned.
5. Connect supplied auxiliary control cable to pins J10.2 and J10.3 on the U2 monitoring board (see
2.3 - Dry Contacts).
3.4 Non-Standard Batteries
When batteries other than a matching battery cabinet are used, a remote battery disconnect switch
with overcurrent protection is required per the National Electrical Code. Contact your local Liebert
sales representative about this option.
Install battery racks, cabinets and batteries in accordance with the manufacturer's instructions.
Verify that the battery area has adequate ventilation and battery operating temperature complies
with the manufacturer's specifications and with all applicable national and local codes.
If you have any questions concerning batteries, battery racks or accessories, contact Liebert Services
at 1-800-543-2378.
3.5 BCB Shunt Trip
The Liebert NX battery cabinet has the shunt trip installed in the circuit breaker. When a DC ground
fault (using the optional DC Ground Fault kit), a battery overtemperature or EPO is activated, the
shunt trip will open the circuit breaker.
NOTE
The grounding bonding arrangement must be in accordance with the National Electrical Code
and all applicable local codes.
NOTE
The Liebert NX battery Cabinet circuit breaker will not open at the end of a battery
discharge. The UPS will isolate the batteries internally in this situation.
Slot in support
secured by screw-in
connector at corner
of battery tray ...
... and notched end of
support slips into slot at
top corner of battery
compartment