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Maintenance
Liebert
®
NX
™
36
Battery Cell Terminals: Check for discoloration, corrosion and connection integrity. Clean and
tighten if necessary. NOTE that when installing a new battery, the initial torque value is 5 lb.-in.
more than the retorque value. Table 7 shows battery retorque values.
If the system uses a different model battery, contact Liebert Services for the required torque value.
To access battery cell terminals, disconnect the inter-tier cable and two shelf retaining screws. Once
disconnected, 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 terminal 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.
Other DC Sources
If the UPS system uses a DC source other than a factory-supplied Matching Battery Cabinet, perform
maintenance on the DC source as recommended in the DC source manufacturer’s maintenance
manual, available on the manufacturer’s Web site.
Table 6 Battery retorque values
Battery Mfr. Battery Model #
Retorque Value
in-lb (N-m)
C&D
UPS12-300MR 110 (12.4)
UPS12-350MR 110 (12.4)
UPS12-400MR 110 (12.4)
UPS12-490MRLP 110 (12.4)
UPS12-540MR 110 (12.4)
Enersys
HX205-FR 65 (7.3)
HX300-FR 65 (7.3)
HX330-FR 65 (7.3)
HX400-FR 65 (7.3)
HX500-FR 65 (7.3)
HX540-FR 65 (7.3)
16HX800F 100 (11.3)
16HX925F 100 (11.3)
East Penn
24HR3000 65 (7.3)
27HR3500 65 (7.3)
31HR4000 65 (7.3)
31HR5000 65 (7.3)