TS 880 TRANSFER SWITCH
PM064 REV8 10/01/25 44 Thomson Technology
Symptom Possible Causes
- A loose control connection
- Faulty Power Switching Device (refer to Power Switching Device
Troubleshooting Section)
- Defective TSC 800 controller (verify output signals with circuit
board mounted diagnostic LED’s)
- TSC 800 has “Transfer Fail” alarm activated (if programmed as
“Force Transfer). Determine cause of alarm and rectify before
TSC 800 is reset
Transfer to generator source
without a power failure in the
utility source
- A test mode has been activated (check TSC 800 status LCD
display)
- Utility supply voltage is slightly above or below voltage sensing
setpoints. Compare TSC 800 program voltage setpoints with
actual utility voltage displayed on the controller
- Defective TSC 800 controller (verify output signals with circuit
board mounted diagnostic LED’s)
- Utility Power Switching Device has opened due to an over current
condition (Service Entrance type ATS) and TSC 800 “Transfer
Fail” alarm activated. (Note: TSC 800 must be programmed as
“Force Transfer for this to occur). Determine cause of alarm and
rectify before TSC 800 is reset
Generator does not start up or
stop when it should
- Verify remote engine control panel is set for automatic mode
No time delay when there should
be
- Verify time delay function in the TSC 800 program setting as per
programming sheets as supplied with the transfer switch
Power is not available at the load
terminals but the utility or
generator power switching unit
appears to be closed to a live
source
- The Power Switching Device (service entrance type ATS) has
opened due to a fault on the system and TSC 800 “Transfer Fail”
is programmed as “Disabled or Halt Transfer”. Correct the fault,
and manually reset the power switching unit.
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