TSC 800 TRANSFER SWITCH CONTROLLER
PM 049 REV 10 08/09/25 Thomson Technology
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The transfer switch shall remain on generator supply until the test mode is terminated.
It will then re-transfer back to the utility supply and continue to operate the generator
set for its cooldown period then stop.
6.1.3.2. TEST CONDITION (CLOSED TRANSITION TRANSFER)
When a load test is initiated in the closed transition transfer mode, the generator will
start and following its warm up delay, the generator will close its power-switching
device when it is in synchronism with the utility supply via external logic device. If the
transfer switch is supplied with a “Momentary” Closed Transition transfer control
option, the utility power switching device will immediately trip open approximately 50-
100 milliseconds after the generator power switching device closes to complete the
“make-before-break” transfer sequence. If the transfer switch is supplied with a “Soft-
Load” Closed Transition transfer control option, the utility power switching device will
remain closed for approximately 5-10 seconds to allow a soft-load power transfer
sequence to be completed as controlled by an external device. The utility power
switching device will then trip open to complete the “make-before-break” transfer
sequence..
The generator will continue to supply the load until the test mode has been removed
and the re-transfer sequence is completed as follows: The utility power-switching
device will close when it is in synchronism with the generator supply via external logic
device.. If the transfer switch is supplied with a “Momentary” Closed Transition transfer
control option, the generator power switching device will immediately trip open
approximately 50-100 milliseconds after the utility power switching device closes to
complete the “make-before-break” re-transfer sequence. If the transfer switch is
supplied with a “Soft-Load” Closed Transition transfer control option, the generator
power switching device will remain closed for approximately 5-10 seconds to allow a
soft-load power transfer sequence to be completed as controlled by an external device.
The generator power switching device will then trip open to complete the “make-
before-break” re-transfer sequence.
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