Kohler 20EFOZ Service Manual

TP-6071 3/0022 Section 6 Controller Troubleshooting
6.3 Engine Safety Shutdown
Switches
6.3.1 Low Oil Pressure (LOP) Shutdown
Switch
When low oil pressure occurs, the LOP shutdown switch
contacts close and energize the K4 relay (LED4 lights).
Note: During cranking, the low oil pressure shutdown
switch is deactivated until the K5 relay energizes.
This delay allows the engine to reach normal
operating oil pressure. The normally closed LOP
contacts open when the generator set develops
oil pressure.
The normally closed K4 contacts open to deenergize the
K25 relay. The closed (normally open) K25 contacts
open to deenergize the fuel solenoid.
The normally open K4 contacts close to maintain a
ground to the K4 relay.
As the generator set shuts down, the K1 relay
deenergizes (LED1 goes out). The normally open K1
contacts open to deenergize the K2 relay (LED2 goes
out). The normally closed K2 contacts close to ground
the circuit to the K4 relay until the generator set comes to
a complete stop.
6.3.2 High Water Temperature (HWT)
and High Exhaust Temperature
(HET) Shutdown Switch
When a high temperature occurs, the shutdown switch
contacts close and energize the K4 relay (LED4 lights).
The normally closed K4 contacts open to deenergize the
K25 relay. The closed (normally open) K25 contacts
open to deenergize the fuel solenoid.
The normally open K4 contacts close to maintain a
ground to the K4 relay.
As the generator set shuts down, the K1 relay
deenergizes (LED1 goes out). The normally open K1
contacts open to deenergize the K2 relay (LED2 goes
out). The normally closed K2 contacts close to ground
the circuit to the K4 relay until the generator set comes to
a complete stop.
TP-6071
Figure 6-3 Safety Shutdown Circuit Schematic

Kohler 20EFOZ Specifications

General

Brand	Kohler
Model	20EFOZ
Category	Portable Generator
Language	English