TSC 900 TRANSFER SWITCH CONTROLLER
PM 151 REV 1 15/10/08 Thomson Power Systems
3.4.5. ABNORMAL SEQUENCE OF OPERATION
3.4.5.1. GENERATOR FAILURE ON LOAD
Should the generator set fail while on load, the transfer switch will automatically
re-transfer the load back to the utility supply if within nominal limits. The utility
return timer will be bypassed in this condition.
NOTE:
This operating condition applies to a normal utility failure as well
as any test condition.
3.4.5.2. TRANSFER SWITCH FAIL ALARM LOGIC
The TSC 900 controller contains logic to detect a transfer mechanism failure.
Should a failure be detected, a forced transfer to the alternate supply will be
initiated if the TSC 900 is programmed for force transfer. Refer to the
programming Section 5 for further information in Force Transfer operation.
3.4.5.3. SERVICE ENTRANCE ATS
For Service Entrance Rated transfer switch applications, the transfer switch
control logic will include signal the transfer switch mechanism to move to the
“Service Disconnected” position when Service Disconnect Operation is
required. In this mode the TSC 900’s transfer control outputs and Transfer Fail
feature is disabled. On return to normal operation, the Utility Power-Switching
Device will be closed to the utility supply if available. Should the utility supply
be out of limits the generator will be issued a start command and the load
transfer to the generator supply once its warm-up time has expired. The ATS
returns to Auto control and will return to the utility supply as previously describe
for the appropriate ATS design type.
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