Troubleshooting – Technicolor - Thomson POWER & CONTROL TS 870 User Manual

Page 37

TS 870 TRANSFER SWITCH

PM062 REV 8 10/01/25

Thomson Technology

18.

TROUBLESHOOTING

DANGER!!!!

Arc Flash and Shock Hazard. Will cause severe injury or death.

Do not open equipment until ALL power sources are disconnected

This equipment must be installed and serviced only by qualified electrical

personnel utilizing safe work practices and appropriate Personal Protective

Equipment (PPE). Failure to do so may cause personal injury or death

Symptom

Possible Causes

Will not re-transfer to utility source
upon restoration

- Isolation plug out

- Utility disconnect switch is in the de-energized position

(Service Entrance Rated ATS). Switch to the Energized
position.

- A test mode has been activated (check TSC 80E status LED)

- Utility voltage is below the pre-programmed limits (check utility

source for adequate voltage)

- A loose control connection

- Faulty motor limit switch

- Defective motor

- TSC 80E has incorrect voltage setting as set via software

programming

- Defective TSC 80E controller (verify output signals with circuit

board mounted diagnostic LED’s)

- TSC 80E has “Transfer Fail” alarm activated as indicated by

flashing Load on Utility LED. Determine cause of alarm and
rectify before TSC 80E is reset

Will not transfer to generator source
upon failure of utility source

- Isolation plug out

- Generator set not producing enough voltage/frequency or

output circuit breaker

open