Alpha Technologies AlphaGen 3.5_5.0kW Kohler COM5 - Manual (Page 55)

TP-6482 8/06 55 Section 6 Controller Operation and Test
Section 6 Controller Operation and Test
This section describes troubleshooting procedures for
the generator set control board, shown in Figure 6-1.
Refer to the operation manual for operating instructions.
Refer
to the remote controller manufacturer’s
instructions for troubleshooting and servicing remote
controllers connected to the generator set.
Control circuit boards GM11783 and GM14243 are not
interchangeable.
However, control circuit board
GM17820 can be used to replace either GM11783 or
GM14243.
6.1 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 fault identification. Use the LEDs on the
controller circuit board to assist in the troubleshooting
process. Refer to the wiring diagrams in Section 8 to
assist in the troubleshooting procedure.
6.1.1 Starting Sequence
Placing the generator set master switch in the RUN
position starts the generator set locally.
With the
generator set master switch in the AUTO position,
momentarily closing contacts P6-5 and P6-6 starts the
generator set remotely.
The crank relay energizes, activating the starter motor,
SM. The hourmeter, ignition module, coil, and gas valve
receive power.
When the engine comes up to speed, the low oil
pressure switch contacts open.
6.1.2 Running Sequence
Leads AC1 and AC2 from the AC side of the voltage
rectifier provide speed sensing signals to the control
board.
Note: The generator set shuts down if the controller
does not obtain AC output within 1 second after
engine start (locked rotor shutdown).
6.1.3 Stopping Sequence
Moving the generator set master switch to the stop
position or closing a remote contact between pins P6-6
and P6-7 (and opening P6-5 and P6-6) deenergizes the
run relay and stops the generator set.
M-337000C-B
1
4
5
1. Control circuit board
2. LED locations
3. Voltage adjustment pot 4. Generator set master switch, 3-position
5. Common fault indicator, LED8
P1
P2
P3
R37
FAULT
RUN
AUTO
STOP
LED1 LED3
LED6
LED7
LED5
LED4 LED2
LED8
2
3
Figure 6-1 Controller Board