Routine Maintenance; Record Log; Air Filters - Emerson Liebert NXL 250 kVA Operation And Maintenance Manual

4.3

Routine Maintenance

You should 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 malfunction.
If you have any doubt as to what must be done, call Liebert Services at 1-800-LIEBERT for further
instructions.
NOTE
Service and maintenance work must be performed only by properly trained and qualified
personnel and in accordance with applicable regulations as well as with manufacturers'
specifications.
The UPS is designed for unattended operation, but does require some common-sense maintenance.
• Keep good records—Troubleshooting is easier if you have historical background.
• 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 (22-26°C) in order to meet
design specifications for capacity and longevity.
The UPS will reliably meet all performance specifications and design life at temperatures up to
104°F (40°C). However, performance and longevity will be optimized when the UPS is operated at
the same temperature as the batteries. Contact your local Liebert sales representative or call
1-800-LIEBERT for further details.
• Keep connections tight—Tighten all connections at installation and at least annually
thereafter (see torque requirements, Table 7.)
• Keep it inspected—Periodically inspect external upstream and downstream circuit breakers to
assure that the trip current settings are correct.
Become familiar with typical ambient conditions surrounding equipment so that abnormal
conditions may be more quickly recognized. Know what typical meter readings are and where
adjustable settings should be.
4.3.1

Record Log

Set up a maintenance log to record scheduled checks and any abnormal conditions.
The log should have space for all metered parameter indications including phase readings, alarm
messages, UPS mode of operation, air filter replacement date and observation notes. A second log
should be maintained for the DC source as directed by the DC source manufacturer.
A periodic walk-through inspection of the UPS and DC source rooms is advised to check for visible
and audible indications of problems. Log the inspection, metered parameter indications and any
discrepancies.
4.3.2

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. 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 dictates.
All NXL models have a replaceable air filter located inside the front doors. These filters can be
changed while the UPS is in operation.
® ™
Liebert NXL 70
Maintenance