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4.2 Routine Maintenance
You are encouraged to become thoroughly familiar with the equipment, but at no time should you go
beyond the specific procedures in this manual while performing maintenance or correcting a malfunc-
tion. If you have any doubt as to what must be done, call Liebert Global Services at 1-800-LIEBERT
for further instructions. The UPS is designed for unattended operation, but does require some com-
mon sense maintenance.
• Keep good records.
• Troubleshooting is easier if you maintain historical service records.
• Keep it clean: Maintain the UPS free of dust and any moisture.
• Keep it cool:
• Battery systems must be kept in the range of 72-77° F (22-25° C) in order to meet design spec-
ifications for capacity and longevity.
• The UPS will reliably meet all performance specifications at temperatures up to 104° F
(40°C), and can be slightly derated for operation at even higher temperatures. However, per-
formance and longevity will be optimized when the UPS is operated at the same temperature
as the batteries.
• Keep connections tight.
• Tighten all connections at installation and at least annually thereafter. (See 4.2.5 - Torque
Requirements).
4.2.1 Record Log
Set up a maintenance log to record scheduled checks and any abnormal conditions.
The log should have space for all metered data including phase readings, alarm messages, UPS mode
of operation, air filter replacement date, and observation notes. A second log should be maintained for
the battery module as directed by the battery manufacturer.
A periodic walk-through inspection of the UPS and battery rooms is advised to check for visible and
audible indications of problems. Log the inspection, metered parameter indications, and any discrep-
ancies.
4.2.2 Air Filters
The air filters must be inspected and serviced on a regular schedule. The period between inspections
will depend upon environmental conditions. Under normal conditions, the air filters will require
cleaning or replacement approximately every two months.
All Npower models have replaceable filter elements behind the grille in the front of the unit. This ele-
ment can be changed with the UPS operating, by opening the outer door for access.
Abnormal or dusty conditions will require more frequent cleaning and replacement of air filters.
Inspect installations in new buildings more often, then extend the inspection period as experience dic-
tates.
4.2.3 Battery Maintenance
!
WARNING
These maintenance procedures will expose hazardous live parts. Refer servicing to qualified
personnel.
DC fuses operate at the rated battery voltage at all times. A blown DC bus fuse indicates a
serious problem. Serious injury or damage to the equipment can result if the fuse is replaced
without knowing why it failed. Call Liebert Global Services for assistance.