TP-6322 9/0432 Section 6 Service Part Replacement
Unbalanced weight.
Improper lifting can cause severe
injury or death and equipment
damage.
Use adequate lifting capacity.
Never leave the transfer switch
standing upright unless it is securely
bolted in place or stabilized.
WARNING
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.
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.
6.1 Before and After Servicing
Components
Before Service. Follow these instructions before
opening the enclosure and servicing the transfer switch.
1. Prevent the emergency power source generator
set from starting by placing the generator set
master switch in the OFF position; disconnecting
power to the generator set battery charger, if
installed; and removing the generator set engine
start battery cables, negative (--) lead first.
2. Disconnect or turn off both the normal and
emergency power sources before opening the
enclosure door. Check circuits with a voltmeter to
verify that the power is off before servicing
components inside the enclosure.
After Service Follow these instructions after servicing
the transfer switch.
1. Reinstall barriers.
2. Remove debris from the enclosure.
3. See Section 2.1 for startup instructions.
6.2 Contactor Assembly
Note: Serviceable contactor assembly parts can be
replaced without removing the contactor
assembly from the enclosure.
6.2.1 Contactor Assembly Removal
1. Disable the generator set and disconnect all power
sources as described in Section 6.1 before
opening the transfer switch enclosure.
2. Loosen the power terminal lugs and disconnect the
normal, emergency, and load power conductors,
and label and tape the ends of the conductors.
3. Disconnect the contactor wiring harness from the
controller at connector P1.
4. Remove the nuts and lock washers located at the
four corners of the contactor’s back plate that
secure the contactor assembly to the back wall of
the enclosure.
5. Lift and pull the contactor assembly from the
enclosure.
6.2.2 Contactor Assembly Installation
1. Position the contactor assembly on the mounting
studs inside the transfer switch enclosure.
2. Reinstall the nuts and lock washers that secure the
contactor assembly.
3. Reconnect the power source and load conductors
to the lugs. Tighten the connections to the torques
shown in Section 3.1.2 of this manual.
Note: Connect the source and load phases as
indicated by the markings and drawings.
Improper connections may cause short
circuits or cause phase-sensitive load
devices to malfunction or operate in reverse.
4. Reconnect the contactor wiring harness to the
controller at connector P1.
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