TS 880 TRANSFER SWITCH
PM064 REV8 10/01/25 43 Thomson Technology
NOTE:
There are no user serviceable components located on the
TSC 800 printed circuit board. If the TSC 800 controller is
deemed to be defective it must be returned to the Thomson
Technology Factory for repair or replacement. Please refer to
Section 22 for further detailed on product return procedures
required.
16. TROUBLESHOOTING (800A-4000A INSULATED CASE SWITCH TYPE
ATS)
Symptom Possible Causes
Will not re-transfer to utility source
upon restoration
- Control wiring isolation plug is removed
- A test mode has been activated (check TSC 800 status LCD
display)
Utility disconnect switch is in the de-energized position (Service
Entrance Rated ATS). Switch to the energized position.
- Transfer mode selector is not in “auto” position
- Utility voltage or frequency is outside the pre-programmed limits
(check utility source for adequate voltage & frequency)
- 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
Will not transfer to generator
source upon failure of utility
source
- Control wiring isolation plug is removed
- Generator set not producing enough voltage/frequency or output
circuit breaker open
- Warmup time delay function has not timed out yet (verify TSC
800 timer setting)
- Transfer mode selector is not in “auto” position
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