TP-6322 9/0410 Section 3 Scheduled Maintenance
Servicing the transfer switch. Hazardous voltage can
cause severe injury or death. Deenergize all power sources
before servicing. Open the main circuit breakers of all transfer
switch power sources and disable all generator sets as
follows: (1) Move all generator set master controller switches
to the OFF position. (2) Disconnect power to all battery
chargers. (3) Disconnect all battery cables, negative (--) leads
first. Reconnect negative (--) leads last when reconnecting the
battery cables after servicing. Follow these precautions to
prevent the starting of generator sets by an automatic transfer
switch, remote start/stop switch, or engine start command
from a remote computer. Before servicing any components
inside the enclosure: (1) Remove all jewelry. (2) Stand on a
dry, approved electrically insulated mat. (3) Test circuits with a
voltmeter to verify that they are deenergized.
Servicing the transfer switch controls and accessories
within the enclosure. Hazardous voltage can cause
severe injury or death. Disconnect the transfer switch
controls at the inline connector to deenergize the circuit boards
and logic circuitry but allow the transfer switch to continue to
supply power to the load. Disconnect all power sources to
accessories that are mounted within the enclosure but are not
wired through the controls and deenergized by inline
connector separation. Test circuits with a voltmeter to verify
that they are deenergized before servicing.
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
When replacing hardware, do not substitute with inferior
grade hardware. 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.
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.
3.1 Inspection and Service
Contact an authorized distributor/dealer to inspect and
service the transfer switch when any wear, damage,
deterioration, or malfunction of the transfer switch or its
components is evident or suspected.
3.1.1 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 noise,
temperature, contamination, or deterioration. Remove
accumulations of dirt, dust, and other contaminants from
the transfer switch’s exterior with a vacuum cleaner or
by wiping with a dry cloth or brush. Do not use
compressed air to clean the switch because it can cause
debris to lodge in and damage the components.
Replace any worn, missing, or broken external
components with manufacturer-recommended
replacement parts. Contact a local authorized
distributor/dealer for part information and part ordering.
Tighten loose external hardware.
3.1.2 Internal Inspections, Procedures,
and Tests
Internal Inspection. Disconnect all power sources,
remove the transfer switch enclosure cover, and inspect
internal components every six months (more frequently
in dusty or dirty areas) or when any condition noticed
during an external inspection may have affected internal
components. Inspect for:
D Accumulations of dirt, dust, moisture, or other
contaminants
D Signs of corrosion
D Worn, missing, or broken components
D Loose hardware
D Wire or cable insulation deterioration, cuts, or
abrasion
D Signs of overheating or loose connections:
discoloration of metal, melted plastic, or a burning
odor
D Other evidence of wear, damage, deterioration, or
malfunction of the transfer switch or its components.
Cleaning. Remove contaminants from internal
components with a vacuum cleaner or by wiping with a
dry cloth or brush if possible. Do not use compressed air
to clean the switch because it can cause debris to lodge
in and damage the components.
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