Kohler l654 Service Manual page 19

I2 VOLT
3CRT
La?-
FUEL 'PUMP
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TRANSFORMER
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CEN::
ATOR
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L2 LI
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"EARLIER MODELS ONLY
241753
Figure 5-7. Sequence of Operation
Schematic 7.5kW
1. Pressing the start-stop switch to the start position ener-
gizes both the cranking contactor "C" and the 2CR relay.
(Diode REI will prevent this from happening if the battery
is connected in reverse.)
5-4
2. Energizing the 2CR relay will allow current to flow
through the 10 Amp in-line fuse to the ignition coil, choke
heater, carburetor shut-down solenoid and electric fuel
pump (if equipped).
3. Energizing
cranking contactor "C" will allow current to
flow to the starter motor and crank the engine. The car-
buretor choke solenoid will also be energized and current
can flow through the normally closed 4CR contacts to the
"B" terminal of the aenerator voltage regulator for the
initial voltage build-up.
4. When the engine starts and the generator is producing
AC output, the 4CR relay (mounted in the generator end
bracket) will energize.
5. The normally CLOSED contacts in the V.B.U. (voltage
. .
bui,ld-up) circuit will then open and disconnect the battery
supply from the generator voltage regulator.
6. The normally OPEN 4CR contacts will close and allow
the 3CR relay to become energized. All the 3CR contacts
will then change positions, the normally open contacts
will close and the normally closed contacts will open.
7. The normally closed 3CR contacts in series with the
"C" cranking contactor will open deenergizing the "C"
contactor. This offers protection from engaging the starter
motor while the unit is operating.
8. The 3CR contacts in series with the 2CR relay coil will
close, maintaining current flow to the 2CR relay coil.
The 2CR relay controls current flow to the engine ignition
circuit.
9. The
now closed 3CR contacts in series with the ICR
relay coil and engine safety cutouts will allow the ICR relay
to become energized if the safety cutout contacts close.
The ICR relay also energizes when the start-stop switch is
placed in the stop position.
10. Energizing the ICR relay, either by the engine safety
cutouts or by placing the start-stop switch to the stop posi-
tion will disrupt current flow to the 2CR relay coil and in
turn prevent current flow to the ignition circuit when the
2CR contacts in this circuit open.
5-3. FUSES
A
WARNING
UNIT STARTS WITHOUT NOTICE!
To prevent accidental
starting on units with a remote start/stop switch, always
disconnect battery (remove negative lead first and recon-
nect it last) to disable generator set before working on any
equipment connected to generator.
There is one IO Amp fuse inside the controller (Figure 5-l).
This fuse protects the controller against damage in the
event a short develops in the engine wiring. If this fuse
"blows" the set will stop. If the set has stopped due to
causes other than lack of fuel, engine malfunction, or low
oil pressure, remove the cover of the controller and check
the fuse. If blown, replace the fuse then attempt to restart
the generator set. If the set will not start, or if the fuse
blows again, locate and correct the cause.