Kohler COM7.5 Service Manual page 41

This section describes troubleshooting procedures for
the generator set control board, shown in Figure 5-1.
Refer to the operation manual for operating instructions.
Refer to the remote
instructions for troubleshooting and servicing remote
controllers connected to the generator set.
5.1 Controller Operation
Microprocessor-based
control of the engine and generator. The control system
accepts remote control inputs for generator start and run
and delivers remote annunciation of unit status and
faults. Internal functions of the controls include start and
stop logic, fault monitoring, generator voltage and
engine speed governing, and fault annunciation through
a common fault LED. See Figure 5-1 for the control
board component locations.
1
2 3 4
1. Common fault indicator LED
2. P1
3. Fuse
4. P2
5. Voltage adjustment potentiometer
6. Generator set master switch
7. P3
Figure 5-1 Generator Set Controls
Generator set master switch.
generator set master switch on the control board allows
local or remote control of the generator set. Momentary
RUN and STOP positions provide local control of the
generator set. The STOP position also resets controller
faults. The generator set master switch moves to the
TP-6120 5/02
Section 5 Controller Operation and Test
controller manufacturer's
controls provide complete
5 7
6
GM22402
A three-position
AUTO position when released, allowing a remote device
to start and stop the generator set. See Section 5.1.3 for
remote start/stop connection information.
5.1.1 Starting the Generator Set
The following procedures describe the actions required
to start the generator set.
Reset the controller by moving the generator set master
switch to the STOP position after applying battery
voltage for the first time or after a voltage interruption.
Local Starting. Move the generator set master switch
to the RUN position and release it to immediately start
the generator set.
Remote Starting. With the generator set master switch
in the AUTO position, close a contact between pins 5
(STT) and 6 (N) on the controller harness connector to
start the generator set.
Note: The control board provides up to 75 seconds of
cyclic cranking before overcrank shutdown
occurs. After a fault shutdown, reset the
controller by moving the generator set master
switch to the STOP position.
At initial startup, the engine's hydraulic lifters may
produce a metallic clicking sound. This is caused by the
hydraulic lifter leakdown during storage.
generator for 5 minutes. The noise will normally cease
in the first minute.
5.1.2 Stopping the Generator Set
The following procedures describe the actions required
to stop the generator set.
Local Stopping. Move the generator set master switch
to the STOP position and release it. The generator set
stops immediately.
Note: When the generator set master switch is
released, it returns to the AUTO position. A start
command from a remote control board can
restart the generator set when the switch is in
AUTO.
Remote Stopping. With the generator set master
switch in the AUTO position, close a remote contact
between pins 6 (N) and 7 (STP) on the controller
harness connector.
Section 5 Controller Operation and Test
Run the
31