TP-6519 8/1738 Section 4 Controller
4.3 Sequence of Operation
The following sections describe the controller sequence
of operation during generator start, run, stop, and fault
shutdown modes. Use this as a starting point for
controller and relay board fault identification. Refer to
thewiringdiagramsinSection7toassistinthe
troubleshooting procedure.
4.3.1 Starting Sequence, Master Switch
Moved to RUN
When the master switch is moved to the RUN position,
there is a delay of about 2 seconds before the controller
attempts to start the engine. The electronic governor
moves to its start position. The fuel (run) relay
energizes and the corresponding LED on the control
board turns on. (See Section 4.6 for relay information.)
Then the crank and flash relays energize and the
corresponding LEDs turn on. The c ontroller display
indicates the crank cycle 1 code, CC 1.
The controller attempts to start the generator set three
times (three crank cycles, 15 seconds crank and 15
seconds off). If the generator set does not start in three
attempts, the system shuts down on an overcrank fault.
When the engine comes up to speed, the low oil
pressure switch contacts open.
Note: The controller circuit board prevents fault
shutdowns during startup until the crank
disconnect relay energizes.
The cyclic cranking cycle is programmed into the
controller’s application code and is not adjustable in the
field.
The factory sets the cranking cycle for three cycles of
15 seconds on time and 15 seconds off time. If the
cranking cycle seems shorter than the factory setting,
check the engine starting battery.
4.3.2 Starting Sequence, Remote Start
The generator set master s witch must be in the AUTO
position for remote start/stop by a remote switch or
automatic transfer switch.
The remote start contact c loses across engine start
leads 3 and 4 to s tart the generator set. The start
sequence proceeds as described in Section 4.3.1,
Starting Sequence, Master Switch Moved to RUN.
4.3.3 Running Sequence
When the engine speed reaches 750 rpm, the crank
relay deenergizes and the crank LED turns off. When
the output voltage reaches about 30 VAC, the flash relay
deenergizes and the flash LED turns off.
4.3.4 Stopping Sequence, Master
Switch Moved to OFF/RESET
Place the generator master switch in the OFF/RESET
position. The run relay deenergizes and the run LED (1)
turns off. The generator set stops.
4.3.5 Stopping Sequence, Remote Stop
The generator set master s witch must be in the AUTO
position for remote start/stop by a remote switch or
automatic transfer switch.
When the remote start contact across leads 3 and 4
opens, the run relay deenergizes and the run LED (1)
turns off. The generator set stops.
4.3.6 Standby Mode
When the generator set master switch is in the AUTO
position, the controller is in standby mode. Engine
runtime hours are shown on the display. A remote s tart
signal (contact closure) will start and run the generator
set.
If there is no start signal for 48 hours, the controller goes
into sleep mode.
4.3.7 Sleep Mode
When the generator set master switch is in the AUTO
position, the controller powers down automatically if
there is no start signal for 48 hours after shutdown. The
controller display is dark and battery draw is minimized.
A remote start signal (from a transfer switch or a remote
start/stop switch connected to controller leads 3 and 4)
reactivates the controller. Moving the generator set
master switch to the RUN position also activates the
controller.
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