TP-7070 7/18 23Section 2 Operation
2.4 Generator Set Operation
2.4.1 Start Signal
A start signal includes the following:
D Remote start signal via contacts 3 and 4 when the
controller is in AUTO mode. The remote start
contacts may be connected to an ATS (used during a
power outage, exercise period, etc.) or a remote
panel.
D Engine Start signal from the controller. Put the
controller into Manual mode. Then press the Engine
Start button on the screen.
Note: The engine crank cycle is 15 seconds cranking
and 15 seconds rest for 3 cycles.
2.4.2 Stop Signal
A stop signal includes the following:
D Removal of start signal via contacts 3 and 4 when the
controller is in AUTO mode. The remote start
contacts may be connected to an ATS (used during a
power outage, exercise period, etc.) or a remote
panel.
D Engine Stop signal from the controller when it is in
Manual mode. Press the Engine Stop button on the
screen.
D Emergency Stop signal. See Section 2.4.4.
2.4.3 Engine Cooldown
Engine Cooldown runs the generator set with no load to
allow hot engine components time to cool slowly before
the engine is stopped.
When the generator set is running in AUTO mode, an
engine cooldown cycle begins when the remote start
input is deactivated. Also, if stopping due to a remote
stop signal, a cooldown cycle begins. The engine runs
for 5 minutes in the cooldown cycle.
Note: No engine cooldown cycle occurs if the Engine
Stop button is pressed (in manual mode), the
Emergency Stop button is pressed, or if a fault
occurs. The shutdown is immediate. If possible,
run the generator set without load for 5 minutes to
ensure adequate engine cooldown.
2.4.4 Emergency Stop
Use the controller emergency stop switch for immediate
emergency shutdown.
The emergency stop switch bypasses the engine
cooldown cycle and immediately shuts down the
generator set.
Note: Use the emergency stop switch(es) for
emergency shutdowns only. Use the controller’s
Manual mode or a remote stop switch for normal
shutdowns.
The controller alarm (fault) button flashes red and the
unit shuts down when the local emergency stop switch is
activated (pressed).
Use the following procedure to reset the generator set
after shutdown by a local or remote emergency stop
switch.
1. Investigate and correct the cause of the
emergency stop.
2. Reset the controller emergency stop switch by
pulling the switch dial outward and/or reset the
remote emergency stop switch (if equipped).
3. Reset the fault on the APM802 controller. See
Section 2.10 for instructions.
4. After resetting all faults using the controller reset
procedure, place the controller into Auto mode or
use Manual mode to restart the generator set. The
generator set will not crank until the reset
procedure completes.
2.4.5 Idle Mode
The generator set controller must be in AUTO mode for
idle mode operation. Idle mode requires a
customer-supplied idle switch connected across
terminals 5 and 6 on terminal block TB10.
When the idle switch on contacts 5 and 6 closes, the
engine runs at low speed (1000 RPM) for 5 minutes.
The engine then ramps up to normal speed and voltage
and continues to run until the idle switch opens. After the
idle switch opens, the engine continues to run through
the cooldown cycle and then shuts down.
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