TP-6487 8/0720 Section 3 Scheduled Maintenance
Short circuits. Hazardous voltage/current can cause
severe injury or death. Short circuits can cause bodily injury
and/or equipment damage . Do not contact electrical
connections with tools or jewelry while making adjustments or
repairs. Remove all jewelry before servicing the equipment.
NOTICE
Hardware damage. The transfer switch may use both
American Standard and metric hardware. Use the correct size
tools to prevent rounding of the bolt heads and nuts.
NOTICE
Electrostatic discharge damage. Electrostatic discharge
(ESD) damages electronic circuit boards. Prevent
electrostatic discharge damage by wearing an approved
grounding wrist strap when handling electronic circuit boards
or integrated circuits. An approved grounding wrist strap
provides a high resistance (about 1 megohm), not a direct
short, to ground.
Screws and nuts are available in different hardness
ratings. To indicate hardness, American Standard
hardware uses a series of markings and metric
hardware uses a numeric system. Check the markings
on the bolt heads and nuts for identification.
3.2 Testing
3.2.1 Weekly Generator Set Exercise
Use the exerciser or a manual test to start and run the
generator set under load once a week to maximize the
reliability of the standby power system. See Section 2.7
for test i nstructions and Section 2.8 for instructions to set
the exerciser.
Optional accessories allow adjustment of the exercise
schedule and duration. See Sections 2.8 and NO TAG.
Refer to the generator set operation manual for exercise
recommendations.
3.2.2 Monthly Automatic Control
System Test
Test the transfer switch’s automatic control system
monthly. See Section 2.7 for the test procedure.
D Verify that the expected sequence of operations
occurs as the switch transfers the load to the standby
source when a preferred source failure occurs or is
simulated.
D Observe the indicator LEDs included on the transfer
switch to check their operation.
D Watch and listen for signs of excessive noise or
vibration during operation.
D After the switch transfers the load to the standby
source, end the test and verify that the expected
sequence of operations occurs as the transfer switch
retransfers to the preferred source and signals the
generator set to shut down after a cooldown period.
3.3 Inspection and Service
Contact an authorized distributor/dealer to inspect and
service the transfer switch annually and also when any
wear, damage, deterioration, or malfunction of the
transfer switch or its components is evident or
suspected.
3.3.1 General Inspection
External Inspection. Keep the transfer switch clean
and in good condition by performing a weekly general
external inspection of the transfer switch for any
condition of vibration, leakage, excessive temperature,
contamination, or deterioration. Remove
accumulations of dirt, dust, and other contaminants
from the transfer switch’s external components or
enclosure with a vacuum cleaner or by wiping with a dry
clothorbrush.
Note: Do not use compressed air to clean the transfer
switch because it can cause debris to lodge in the
components and damage the switch.
Tighten loose external hardware. Replace any worn,
missing, or broken external components with
manufacturer-recommended replacement parts.
Contact a local authorized distributor/dealer for specific
part information and ordering.
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