Section IV
Maintenance
Page 4.2
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4. Keep cabinet doors closed and secured
during normal operation.
5. Never guess about safety procedures. If
any doubt exists, ask someone who
knows.
6. Always be aware of the presence of
high voltage within the UPS. Check with
a voltmeter to make sure power is off and
conditions are safe before attempting to
make repairs, adjustments, etc. within the
unit.
7. Above all, always USE COMMON
SENSE!
4.3 Preventive (Periodic) Maintenance
The following paragraphs describe preventive maintenance procedures which, when
followed, will increase the reliability and efficiency of the UPS system operations.
4.3.1
Air Flow
Blower fans should be checked for cleanliness and proper operation at least annually.
These are located within the power section and should be checked only during a period when
the UPS is in Maintenance Bypass mode. Excessive dirt or imbalance can reduce blower
effectiveness, causing a rise in system temperature which will result in an overtemperature
alarm and possible system shutdown.
4.3.2
Cable Connections
Cable connections to circuit breaker and switch terminals should be checked
whenever the system is powered down and at least annually. This necessitates removal of the
circuit breaker panel to gain access.
WARNING
Be aware of the presence of high voltages within the UPS! When
the system is shut down, wait at least five (5) minutes after all panel
lights go out before proceeding. Then check for the presence of
power with a voltmeter across the input and output terminals.
