TSC 800 TRANSFER SWITCH CONTROLLER
PM 049 REV 10 08/09/25 Thomson Technology
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6. OPERATING INSTRUCTIONS
To operate the TSC 800 controller and associated transfer switch using the front faceplate
pushbuttons, refer to the following detailed operating instruction sub-section descriptions.
6.1. AUTOMATIC SEQUENCE OF OPERATION
6.1.1. NORMAL SEQUENCE OF OPERATION (OPEN TRANSITION
TRANSFER)
Under normal operating conditions, the transfer switch operates automatically during a
failure and restoration of utility power and does not require operator intervention.
NOTE:
Refer to sections 6.5 & 6.10 which may require operator
intervention
When utility supply voltage drops below a preset nominal value (70 – 99% of rated
adjustable) on any phase, an engine start delay circuit will be initiated. Following
expiry of the engine start delay period (0 - 60 sec. adjustable) an engine start signal
(contact closure) will be given.
Once the engine starts, the transfer switch controller will monitor the generators
voltage and frequency levels. Once the generator voltage and frequency rises above
preset values (70 – 99% nominal adjustable) a warm up time delay will be initiated.
Once the warm up timer (0 - 3000 Sec adjustable) expires the transfer to utility supply
signal will be removed (i.e. contact opening) and the transfer to generator supply
signal (contact closure) will be given to the transfer switch mechanism. The load will
then transfer from the utility supply (i.e. opening the utility power switching device) to
the generator supply (closing the generator power switching device) to complete a
break-before-make open transition transfer sequence.
The generator will continue to supply the load until the utility supply has returned and
the retransfer sequence is completed as follows: When the utility supply voltage is
restored to above the present values (70 - 99% of rated adjustable) on all phases, a
utility return delay circuit will be initiated. Following expiry of the utility return timer (0 –
50.0 min. adjustable), the transfer to generator supply signal will be removed (contact
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