Product Manual

4. Troubleshooting7-2019
23A052S254 (Issue 3) Copyright © 2019 Cummins Inc.
WARNING
Improper operation of the generator set presents a hazard that can cause severe personal injury
or death. Observe all safety precautions in your generator set manuals.
TABLE 7. TROUBLESHOOTING THE TRANSFER SWITCH (PROBLEM #1)
Problem Possible Causes Corrective Actions
The transfer switch
failed to transfer to
the generator set.
1. The K1 relay coil may not have received a
signal from the controller.
Refer to the interconnect diagram at the end
of this manual and check for the transfer
command signal at TB4. Generator set
models C13N6H, C17N6H, C20N6H require a
jumper between TB4-3 and TB1-4.
2. K1 relay may malfunction. Verify the K1 relay coil is energizing:
1. If the coil is energizing:
• Check the wiring between the relay
and the transfer switch (B1 and
B2). It should be 240 VAC.
• Check to see if the transfer switch
is faulty.
2. The coil is not energizing:
• Check to see if the K1 relay is
faulty.
• If faulty, replace the K1 relay.
3. There may be a defective wire. Check, inspect, or replace the defective wire.
4. The switch mechanism solenoid may have
failed.
Be sure that both voltage sources are turned
off before operating the switch manually.
Manually operate the switch by using the
operator handle to manually transfer the
switch. If the switch manually transfers, the
solenoids are burnt out; replace the switch
mechanism.
5. There may be loose or broken parts within
the switch mechanism.
Be sure that both voltage sources are turned
off before operating the switch manually.
Manually operate the switch by using the
operator handle to manually transfer the
switch. If the switch does not manually
transfer, replace the switch mechanism.
6. If the generator set started it may have
been running an Exercise program.
The transfer switch does not transfer for a
programmed exercise.
7. The circuit breaker on the generator set
may be set to off (open).
Close the generator set circuit breaker.