Test Modes; Over Current Protection - THOMSON TS 880 Service Manual

power switching units must be manually operated as follows.
manually, push the unit's OPEN pushbutton. The unit should then open. Repeat
for the other power switching unit.
4. Close the transfer switch door securely using a suitable tool. Lock the door in
the closed position and remove the key.
6. Attach a safety lockout padlock to the service disconnect control switch to
prevent unauthorized change in operating condition and verify transfer switch
door is locked closed.
7. To reenergize the load, remove the padlock(s) from the service disconnect
control switch, and move the switch to the Energized position. The transfer
switch will immediately return to the utility or generator supply if within normal
operating limits.
5.3.

TEST MODES

The transfer switch may be tested utilizing the TSC 800 controller push-buttons or optional
four position test switch. A simulated utility power failure condition will be activated when
the test mode is selected. The transfer switch will operate as per a normal utility power fail
condition.
The transfer switch will remain on generator supply until the test mode is terminated. It will
then immediately transfer back to the utility supply and then continue to operate the
generator set for its cooldown period then stop. Note: The transfer switch will automatically
return to the utility supply (if within nominal limits) if the generator set fails while in the test
mode.
6.

OVER CURRENT PROTECTION

Thomson Technology TS 880 series of Automatic Transfer Switches may be supplied with or
without integral over current protection as described below:
PM064 REV8 10/01/25
TS 880 TRANSFER SWITCH
WARNING!
Failure to open both power switching devices
to the OPEN position may result in serious
personal injury or death due to electrical
shock.
21
To operate
Thomson Technology