Kohler 125EOZ/100EFOZ, Service Manual, Page: 60 / 148

TP-5737 5/01 46 Section 6 Decision-Maker
t
1 Controller Troubleshooting
Function Relay
Relay Contact
Normal Position Relay Contact
Action
Energizes/Action:
K2 relay and LED2 lights
St ti Cl th t t/ t it h
K2 Open Close
K10 relay (with F-254717) or K5
relay (with E-254717, engine
components (fuel system, governor,
ignition, etc.), K4 relay, and LED4
lights
Starting: Close the start/stop switch
between N and 47.
Note : Fault shutdowns are inhibited during
startup until K3 energizes. K10
or K5
Open Close
Hourmeter on Decision-Maker
t
1
and Decision-Maker
t
1 Expanded
controllers and engine gauges
(battery voltage, water temperature,
and oil pressure) on
Decision-Maker
t
1 Expanded
controllers
K4 Open Close K20 relay
K20 Open Close Starter motor
Running: Generator winding 7--10
d AC t t
K3 relay and LED3 lights
g g
produces AC output.
Note : K3 relay must obtain AC output
within 30 seconds or overcrank fault
K3 Closed Open
Deenergizes K4 relay and LED4
deenergizes
within 30 seconds or overcrank fault
occurs.
K4 Open Open Deenergizes starter motor
Stopping: Move the start/stop switch to
Deenergizes K2 relay and LED2
deenergizes
Stopping: Move the start/stop switch to
open circuit between N and 47.
K2 Open Open
Deenergizes engine components;
generator set shuts down
Fault shutdowns: Low oil pressure (LOP),
high engine temperature (HET) after the
engine operating temperature reaches
103
_
C (218
_
F), and high exhaust
temperature (ETS) (wet exhaust only) after
the exhaust temperature reaches
K1 relay, LED1 lights, and fault
lamp
the exhaust temperature reaches
88--102
_
C (190--215
_
F). Contacts close
5--8 seconds after reaching shutdown
level.
Note : The fault shutdown latches to keep
the fault lamp lit. Move the generator set
master switch to OFF/RESET.
K1 Closed Open
Deenergizes engine components;
generator set shuts down
Fault shutdown: Overspeed (OS).
Contacts close when engine speed
reaches shutdown level. Factory set at
70 Hz
K1 relay, LED1 lights, and fault
lamp
70 Hz.
Note : The fault shutdown latches to keep
fault lamp lit. Move the generator set
master switch to OFF/RESET.
K1 Closed Open
Deenergizes engine components;
generator set shuts down
Fault shutdown: Overcrank (OC).
Contacts close on overcrank (locked rotor)
if the speed sensor signal is absent longer
than 30 seconds
K1 relay, LED1 lights, and fault
lamp
than 30 seconds.
Note : The fault shutdown latches to keep
the fault lamp lit. Move the generator set
master switch to OFF/RESET.
K1 Closed Open
Deenergizes engine components;
generator set shuts down
Figure 6-3 Relay Controller Sequence of Operation