THOMSON TS 880 - 17 Power Switching Device Troubleshooting (800 A-4000 A Insulated Case Switch Type Ats)

TS 880 TRANSFER SWITCH
PM064 REV8 10/01/25 45 Thomson Technology
17. POWER SWITCHING DEVICE TROUBLESHOOTING (800A-4000A
INSULATED CASE SWITCH TYPE ATS)
MALFUNCTIONS PROBABLE CAUSES CORRECTIVE ACTIONS
The power switching device
cannot be opened locally.
- Open push-button locked. - Remove the locking.
- Faulty mechanism or main
circuits bonded.
- Contact Thomson Technology Service
Department.
The power switching device
cannot be manually closed.
-
power switching device closing
on short-circuit.
-
Clear the fault. Check power switching
device condition before putting back into
operation.
-
Fault trip indicator-on power
switching device button not
reset. (Service Entrance type
ATS)
- Reset fault trip indicator-button.
-
power switching device not fully
connected. (draw-out type only)
-
Connect power switching device fully.
- Anti-pumping function. - Move transfer mode switch to the manual
position, then back to the auto position to
cycle the control signal.
-
power switching device not
charged.
- Check the geared motor power supply is
greater than 85% nominal voltage. Check
the power supply circuit. Attempt a manual
recharging. Replace the geared motor if
necessary. (Contact Thomson Technology
Service Department)
- Closing coil is continuously
supplied.
- Move transfer mode switch to the manual
position, then back to the auto position to
cycle the control signal.
-
power switching device locked
in “open” position.
- Remove the locking.
-
power switching device
interlocked.
- Check whether this refusal to close is not
normal.
The power switching device
does not recharge
electrically.
- Charge motor supply voltage too
low (less than 85% nominal
voltage).
- Apply a voltage greater than 85% nominal
voltage. Check the charge motor electrical
circuit. Attempt to recharge manually. If
problem: mechanism is faulty. Contact
Thomson Technology Service Department.
If okay: motor faulty. Replace it.
It is impossible to insert the
racking handle to connect or
to disconnect the power
switching device.
- There is a padlock or a key-lock
for connected or disconnected
position. There is a racking
interlock.
- Remove disabling.
-
The extraction rails or the power
switching device is not
completely pushed in.
-
Push the rails or the power switching
device completely in.
It is impossible to extract
the right side rail (on
chassis alone) or the power
switching device.
- The racking handle is remained
inserted.
- Remove the racking handle and put it in its
storage.
-
The power switching device is
not completely disconnected.
-
Disconnect the power switching device