TP-6461 1/0840 Section 3 Transfer Switch Troubleshooting
Problem
See
Section
CheckPossible Cause
Failure to transfer:
Transfer switch electrical
malfunction
Damaged or wrong coil Check for signs of overheating.
Measure the coil resistance to check
for damaged coil. Replace the coil if it
is damaged.
Verify that the coil voltage rating
matches the transfer switch voltage
rating and source voltage. Replace
with coil that has the correct rating.
3.6
Damaged or wrong resistor (Not
used on all models. See the coil
replacement procedures for your
model to identify resistor.)
Inspect/test resistor (not used on all
models). Replace resistor if damaged.
TOC
Corroded or fused contacts Inspect contacts. Clean or replace. Do
not use an emery cloth or file. See the
Table of Contents for contact
replacement procedures for your
model.
1.2.2
TOC
Coil control contact operation Test coil control contact operation. See
the Table of Contents for control
contact test procedures for your model
transfer switch.
TOC
Faulty connections Check leads and harnesses for loose
connections, broken leads, or incorrect
connections.
W/D
Wrong voltage Check system voltage, controller
system voltage and over/undervoltage
pickup and dropout settings, and
controller meter calibration.
2, 4
Chattering noise when attempting
to transfer
Coil control contact operation See the Table of Contacts for control
contact test procedures for your model
transfer switch.
TOC
Low voltage Check source voltage and connections. 3.3.2
Incorrect spring See the Table of Contents for coil
replacement instructions for your model
transfer switch.
TOC
Wrong coil Check coil voltage rating and verify that
it matches the transfer switch voltage
rating.
—
Contactor transfers then hums or
Auxiliary switches misaligned Realign switches. TOC
burns out solenoid
Auxiliary switches failed Replace switches. TOC
O/I/M= Operation and Installation Manual; O/M = Operation Manual; TOC = Table of Contents, this manual;
W/D = Wiring Diagrams
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