TS 910 TRANSFER SWITCH
PM140 REV 2 14/01/23 52 Thomson Power Systems
20 TROUBLESHOOTING
Will not re-transfer to utility source
- TSC 9 Isolation plug is disconnected
A test mode has been activated (check TSC 9 status LED)
Utility voltage is below 80% rated voltage (check utility source
for adequate voltage)
A loose control connection
Defective utility solenoid coil
TSC 9 has incorrect voltage configuration jumper setting for
correct system voltage
Defective TSC 9 controller (verify output signals)
TSC 9 has “Transfer Fail” alarm activated as indicated by
flashing Load on Utility LED. Determine cause of alarm and
rectify before TSC 9 is reset
In-phase transfer control has not detected an ‘in-phase
condition to permit transfer. Transfer switch will automatically
bypass an in-phase transfer after 5 minutes
Will not transfer to generator source
upon failure of utility source
TSC 9 Isolation plug is disconnected
Generator set not producing enough voltage/frequency or
output circuit breaker open
TSC 9 has incorrect voltage configuration jumper setting for
correct system voltage
Warm-up time delay function has not timed out yet (verify TSC
9 timer setting)
A loose control connection
Defective generator solenoid
Defective TSC 9 controller (verify output signals with circuit
board mounted diagnostic LED’s)
TSC 9 has “Transfer Fail” alarm activated as indicated by
flashing Load on Generator LED. Determine cause of alarm
and rectify before TSC 9 is reset
If Utility voltage is present, In-phase transfer control has not
detected an ‘in-phase condition to permit transfer. Transfer
switch will automatically bypass an in-phase transfer after 5
Transfer to generator source without a
power failure on the utility source
A TEST or EXERCISE mode has been activated (check TSC 9
status LED)
Utility supply voltage is less than 70% on one or both phases
of nominal voltage
Verify TSC 9 has correct voltage configuration jumper setting
for system voltage
Defective TSC 9 controller (verify output signals with circuit
board mounted diagnostic LED’s)
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