THOMSON TS 870 - Over Current Trip; Service Disconnect Procedure

TS 870 Transfer Switch
PM062 REV 11 16/04/19 26 Thomson Power Systems
5.4.2. OVER CURRENT TRIP
Should the utility power switching device trip open due to an over current condition,
TSC 900 transfer controller will initiate an engine start signal and will permit transfer of
the load to the generator supply provided the TSC 900 is programmed for Forced
Transfer. The utility source will be locked out and the load will remain on the generator
supply until the TSC 900 alarm signal is manually reset.
Refer to the TSC 900 Instruction Manual for further details on Transfer Fail/Force
Transfer operation.
Should the generator power switching device trip open due to an over current condition,
TSC 900 transfer controller will initiate transfer of the load to the utility supply provided
the TSC 900 is programmed for “Forced Transfer”. The generator source will be locked
out and the load will remain on the utility supply until the TSC 900 alarm signal is
manually reset.
5.4.3. SERVICE DISCONNECT PROCEDURE
To perform a service disconnect (i.e. to disconnect the utility and generator supplies),
the following procedure is required:
1. Move the Service Disconnect control switch located on the door of the
transfer switch to the Transfer to Neutral position and wait 2 seconds for the
ATS to complete a transfer to the neutral position.
2. Once the ATS has transferred to the neutral position, move the Service
Disconnect control switch to the Disconnected position.
3. Verify that the Service Disconnected pilot light is illuminated. If the Light is
illuminated, the service has been successfully disconnected and it is safe to
perform any maintenance procedures as required. In this condition, the
transfer switch is in the neutral position, with both utility and generator
transfer power switching devices open. The transfer switch will remain in
this condition, regardless of condition of the utility and generator supplies.
NOTE: If the Service Disconnect Light is not illuminated, additional
procedures are required (refer to the following procedure #5.2.4).
4. Attach safety lockout padlock to the "Service Disconnect" control switch to
prevent unauthorized change in operating condition and verify transfer
switch door is locked closed. If the door is not locked, turn and remove door
key.
WARNING