TS 910 TRANSFER SWITCH
PM140 REV 0 12/02/09
48
Thomson Technology
20. TROUBLESHOOTING
Symptom
Possible Causes
Will not re-transfer to utility source
upon restoration
- 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
minutes
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)
