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Maintenance
35 Liebert
®
NX
™
NOTICE
Risk of improper cleaning. Can cause equipment damage.
Batteries should be cleaned with a dry cloth or a cloth lightly moistened with water. Do not
use cleaners on the batteries. Solvents can make the battery cases brittle.
Because individual battery characteristics are not identical and may change over time, the
UPS module is equipped with circuitry to equalize battery cell voltages. This circuit increases
charging voltage to maintain flooded type battery cells at full capacity.
Because individual battery characteristics are not identical and may change over time, the
UPS module is equipped with circuitry to equalize battery cell voltages. This circuit increases
charging voltage to maintain flooded type battery cells at full capacity.
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, measure 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 Liebert Services.
Power Connections: Check for corrosion and connection integrity. Inspect wiring for discolored or
cracked insulation. Clean and/or retighten as required. Refer to torque specifications in Table 7.
!
WARNING
Risk of electric shock, explosive reaction, hazardous chemicals and fire. Can cause equipment
damage, personal injury and death.
Do not use equalize charging with valve-regulated, lead-acid batteries. Refer to the battery
manufacturer’s manual, available on the manufacturer’s Web site, for specific information
about equalize charging.
Table 5 Battery voltage, nominal and float
Number of Cells
Battery Voltage, VDC
Nominal Float
240 480 527 - 552