Run; Stop; Engine Safety Shutdown Switches; Low Oil Pressure (Lop) Shutdown - Kohler 32EOZ Service Manual

6.2.2

Run

The K1 relay energizes (LED1 lights) when the B1 and
B2 windings receive AC output from the stator main
field. After a 5--10 second time delay, the K5 relay
energizes (LED5 lights).
Note: The bridge rectifier (BR1) and the voltage
regulator (VR1) provides 12 volts DC voltage to
the K1 and K5 relays.
Stator winding V1--V4 provides voltage sensing source
to the voltage regulator (PBV).
The normally open K1 (A) contacts close to maintain
voltage to the K2 relay (LED2 remains lit).
The normally open K2 contacts remain closed to
maintain voltage to the fuel solenoid and the controller
hourmeter.
The normally open K1 (B) contacts close to energize the
(optional) oil pressure, coolant temperature, battery
voltmeter, hourmeter gauges, and generator ON light.
The normally open K5 contacts close to permit the high
water temperature (HWT), high exhaust temperature
(HET), and low oil pressure (LOP) switches to function.
Note: The LOP switch contacts open when the engine
develops oil pressure.
One set of normally closed K1 (C) contacts open to
disconnect the circuit to (+) connection of the exciter
fields (field flashing).
A set of normally closed K1 (E) contacts open to
disconnect the circuit to (--) connection of the exciter
field (field flashing). The normally closed K1 (D)
contacts open to deenergize the K3 relay (LED3 goes
out) and prevent accidental reenergizing of the starter
motor. The K3 contacts open to deenergize the K20
relay. The K20 contacts open to deenergize the S relay.
The S contacts open to deenergize the starter motor.
When the generator set is running, the start switch
contacts N and 47 are opened by releasing the
start/stop rocker switch.
20 Section 6 Controller Troubleshooting
6.2.3

Stop

Close the start/stop switch between N and 43 (local or
remote).
The K4 relay is energized (LED4 lights).
The normally closed K4 contacts open to deenergize the
K25 relay. The K25 normally open contacts open to
deenergize the fuel solenoid.
The normally open K4 contacts close to maintain ground
to the K4 relay.
As the generator set is shutting down, the K1 relay is
deenergized (LED1 goes out). The normally open K1
(A) contacts open to deenergize the K2 relay (LED2
goes out).
6.3 Engine Safety Shutdown
Switches
6.3.1

Low Oil Pressure (LOP) Shutdown

When low oil pressure occurs, the LOP shutdown switch
contacts close and energize the K4 relay (LED4 lights).
Note: During cranking, the LOP shutdown switch is
deactivated until the K5 relay is energized. This
delay allows the engine to reach normal
operating oil pressure. The normally closed LOP
contacts open when the generator set develops
adequate oil pressure.
The normally closed K4 contacts open to deenergize the
K25 relay. The normally open K25 contacts open to
deenergize the fuel solenoid.
The normally open K4 contacts close to maintain ground
to the K4 relay.
As the generator set shuts down, the K1 relay is
deenergized (LED1 goes out). The normally open K1
(A) contacts open to deenergize the K2 relay (LED2
goes out). The normally closed K2 contacts close to
ground circuit to the K4 relay until the generator set
comes to a complete stop.
TP-5936 7/04