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114 Maintenance
Matching Battery Cabinets (Optional)
Although the individual battery cells are sealed (valve-regulated) and require only minimal maintenance, the
Battery Cabinets should be given a periodic inspection and electrical check. Checks should be performed at least
annually to ensure years of trouble-free service.
Voltage Records. With the Battery Cabinet DC circuit breaker closed and the connected UPS operating, mea-
sure and record battery float voltage. With the DC circuit breaker open, measure and record the nominal (open
circuit) voltage. Both these measurements should be made across the final positive and negative terminal lugs.
Compare these values with those shown below. The recorded nominal voltage should be no less than the value
shown, while the recorded float voltage should be within the range shown. If a discrepancy is found, contact Lie-
bert Global Services.
Power Connect ions. Check for corrosion and connection integrity. Visually inspect wiring for discolored or
cracked insulation. Clean and/or retighten as required. Refer to torque specifications in Table 4.
Battery Cell Terminals. Check for discoloration, corrosion, and connection integrity. Clean and tighten if nec-
essary. Note that when installing a new battery, the initial torque value is 5 lb.-in. more than the retorque value.
Retorque values are:
If you have a different model battery, contact Liebert Global Services for the required torque value.
To access battery cell terminals, disconnect the inter-tier cable and two shelf retaining screws. Once discon-
nected, insulate (with protective boot or electrical tape) the cables to prevent accidental shorts. The battery shelf
can now be pulled out. Tighten each terminal connection to the retorque value. When replacing a battery, the ter-
minal connections must be cleaned and tightened. Disconnect and insulate the cables connected to the battery.
Secure each battery shelf with retaining screws when maintenance is complete.
Rack-Mounted Batteries
If the UPS system uses a battery other than a factory-supplied Matching Battery Cabinet, perform maintenance
on the battery as recommended in the battery manufacturer’s maintenance manual.
4.3.4 Torque Requirements
All electrical connections must be tight. Table 4 provides the torque values for the connections in the UPS.
Number of Cells
Battery Voltage (VDC)
Nominal Float
240 480 527 - 576
Battery Manufacturer Battery Model Number Retorqu e Value
Johnson Controls Batteries UPS12
-270(FR) 32 lb-in.
UPS12
-310(FR) 52 lb-in.
UPS12
-370(FR) 52 lb-in.
UPS12
-475(FR) 100 lb-in.
C&D Batteries LS12
-100 100 lb-in .
12G
-17 100 lb-in.
Power Batteries PRC12110X 65 lb
-in.
PRC12120X 65 lb
-in.
PRC12150X 85 lb
-in.
PRC1290X 65 lb
-in.
TC12110X 65 lb
-in.
TC12120X 65 lb
-in.
TC12150X 85 lb
-in.
TC1290X 65 lb
-in.
NOTE
Refer to battery manufacturer's manual for the proper torque values required for the
battery.
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