TSC 80e TRANSFER SWITCH CONTROLLER
PM091 Rev 0 09/01/21 Thomson Technology
15
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 expiry of
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 and
neutral delay timers 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 80e 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
Disabling of the “TRANSFER SWITCH FAIL” feature is possible
by selecting the “Disconnected” position on “Service Entrance
Models” or by a closure between terminals 38 & 42 on the TSC
80e. In these situations the TSC 80e controller will not verify
that the transfer mechanism has operated correctly to provide
power to the load bus.
To Next Page
Loading...
Need help?
General
