SECTION IV
Maintenance
Page 4.1
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4.1 General
Proper maintenance, both preventive and remedial, is the key to optimal
operation of the UPS and will ensure a long and useflil life of the equipment.
Preventive maintenance includes regularly performed procedures designed to
prevent system malfunction and obtain maximum operational efficiency. Re-
medial maintenance consists of troubleshooting the system in order to effect
repairs. Troubleshooting the UPS involves following a logical sequence of steps
which will determine the cause of an alarm and/or malfunction within the shortest
time frame safely possible so as to expedite the repair and return of the equipment
to normal service.
The manufacturer recommends that the monitor panel be inspected
visually every eight-hour shift to see that lights are operating and no alarm
conditions exist. The Alarm History should be checked at this time (see
Paragraph 3.6.2) to determine if any recent alarms have gone un-noticed. If
any unusual conditions exist, call facility maintenance personnel or Service
Hotline: 800-777-8922 or (outside U.S.) 919-871-1800.
4.2 Safety Precautions
For safe and successful maintenance on the system, certain basic safety
precautions must be observed, necessary tools and test equipment must be
available, and properly trained maintenance personnel must be involved.
The following basic safety practices should always be observed:
1. Always be aware that hazardous voltages are present within the UPS even
when the system is not operating.
WARNING
On a single-input UPS, when input voltage does
not equal output voltage, output transformer
(T2) is energized in Maintenance Bypass Mode.
2. Ensure that UPS operating and maintenance personnel are thoroughly familiar
with the equipment and with the contents of this manual.
