TSC 800 TRANSFER SWITCH CONTROLLER
PM 049 REV 9 06/04/24 Thomson Technology
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6.1.4. ABNORMAL SEQUENCE OF OPERATION
6.1.4.1. GENERATOR FAILURE ON LOAD
Should the generator set fail while on load, the transfer switch shall 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.
6.1.4.2. TRANSFER SWITCH FAIL ALARM LOGIC
The TSC 800 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 800 is programmed for force transfer. Refer to the
programming Section 7.5.14 for further information in Force Transfer operation.
6.1.4.3. SERVICE ENTRANCE ATS
For Service Entrance Rated transfer switch applications, the transfer switch
control logic will include external wiring to signal the transfer switch mechanism
to move to the “Service Disconnected” position when Service Disconnect
Operation is required. In this mode the TSC 800’s transfer control outputs and
Transfer Fail feature is disabled. On return to Service the TCS 800 will display
“Resuming Normal Operation” and the Power-Switching Device will be closed
to the utility supply. 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.
NOTE: On return to Normal Service the Engine Start output is inhibited (held
up) for approximately 8 – 10 seconds. Requesting another mode of operation
requiring the engine start contact to close will be ignored until this timer expires.
6.2. LCD DISPLAY OPERATION
The TSC 800 LCD display will operate in the following modes:
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