TSC 900 TRANSFER SWITCH CONTROLLER
PM 151 REV 5 16/04/19 Thomson Power Systems
3.3. ATS OPERATION MODE DESCRIPTIONS
The TSC 900 has the following main operating modes as described per the table below:
ATS Mechanism
Control Outputs
ATS automatically transfers to generator
(source 2) during a utility (source 1) failure and
automatically returns power to utility once
restored
Outputs automatically
operate ATS
mechanism per
automatic sequence of
operation
Output contact closes to start
engine during a utility (source 1)
failure and opens to stop engine
once utility power has transferred
back on load.
ATS is Out of Service - will not automatically
operate during a utility power failure
Outputs remain in their
last state to keep ATS
in its current position
Output is disabled - engine will not
start during a utility power failure
1
Engine will stop if it was previously
running
ATS is Out of Service -will not automatically
operate during a utility power failure. ATS can
be operated manually for testing or emergency
operation
Outputs de-energize to
allow ATS to be
operated manually
Output is disabled - engine will not
start during a utility power failure
1
.
Engine will stop if it was previously
running
ATS transfers to neutral position to disconnect
power to the load. ATS will not automatically
operate during a utility power failure.
Outputs momentarily
energize to move ATS
mechanism to the
neutral position
Output is disabled - engine will not
start during a utility power failure
1
.
Engine will stop if it was previously
running
When ONLOAD TEST mode is initiated, a utility
power failure condition will be simulated which
will cause engine to start and ATS will transfer
to generator supply. When TEST mode is
terminated, ATS will transfer back to utility
supply and engine will stop
Outputs automatically
operate ATS
mechanism per
automatic sequence of
operation
Output contact closes to start
engine during the ONLOAD TEST
mode. Output automatically opens
when test mode is terminated and
ATS is back on utility power
When OFF LOAD TEST mode is initiated,
engine will start and run off load. When OFF
LOAD TEST mode is terminated, engine will
stop
Outputs do not change
state unless utility or
generator supply fails
in Off Load test mode
Output automatically closes to start
engine during the OFF LOAD test
mode. Output automatically opens
when test mode is terminated
When a TIMED TEST is initiated, the ATS will
perform test per the selected type (i.e. on load
or off load) and time period. The Generator, will
continue to run for the TIMED TEST duration,
then will automatically stop.
Outputs operate ATS
mechanism per
automatic sequence of
operation if
programmed for ON
LOAD TEST operation.
Output contact closes to start
engine during the TIMED TEST
mode. Output automatically opens
when exercise mode is terminated
When an EXERCISE SCHEDULE occurs, the
ATS will perform exercise test on the pre-
selected calendar date and time. The
Generator will operate on load or off load as
selected, and will continue to run for the
Exercise duration period as selected. If a re-
occurring Exercise mode is selected, ATS will
repeat an exercise test based on the calendar
dates and times as selected.
Outputs operate ATS
mechanism per
automatic sequence of
operation if
programmed for ON
LOAD TEST operation.
Output contact closes to start
engine during the EXERCISE test
mode. Output automatically opens
when exercise mode is terminated
1
The TSC 900 requires continuous control power (i.e. utility/gen power on, or 24VDC aux power on) to keep the automatic engine start
output disabled. If control power is de-energized, the engine start output will close in approximately 3 minutes, once its internal control
power reservoir de-energizes. This in turn will cause a repeating engine start/stop event every 3-4 minutes. To prevent engine start/stop
cycling condition upon loss of control power, the local engine control panel should be selected for the OFF operating mode.
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