TSC 80 TRANSFER SWITCH CONTROLLER
PM063 Rev 7 09/02/27
Thomson Technology
15
neutral delay timer (0-30 seconds adjustable) setting. Once the time delay expires, the
re-transfer sequence will be completed.
An engine cooldown timer circuit will be initiated once the load is transferred from the
generator supply. Following expiry of the cooldown delay period (0 - 30 min.
adjustable) the engine start signal will be removed (contact opening) to initiate
stopping of the generator set.
3.1.2. ABNORMAL OPERATION
3.1.2.1.TEST CONDITION
A test pushbutton on the transfer switch shall signal a simulated utility power
fail signal to the transfer switch controller. The transfer switch shall operate as
per a normal utility power fail condition. The neutral delay circuit logic will be
active during transfer to and from the generator supply (i.e. when both sources
of power are available).
The transfer switch shall remain on generator supply until the test mode is
terminated. It will then retransfer back to the utility supply following the transfer
return timer and then continue to operate the generator set for its cooldown
period then stop.
3.1.2.2.GENERATOR FAILURE ON LOAD
Should the generator set fail while on load, the transfer switch shall retransfer
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 shall apply to a normal utility failure as
well as any test condition.
3.1.2.3.TRANSFER SWITCH FAIL ALARM LOGIC
The TSC 80 controller contains logic to detect a transfer mechanism failure.
Should a failure be detected, a forced transfer to the alternate supply will be
initiated. Detailed logic operation is as follows
:
NOTE
The “TRANSFER SWITCH FAIL” feature can be disabled by
activating the “Service Entrance” Mode by jumpering terminal
Summary of Contents for TSC 80
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