Section 6 Decision-Makert 1 Controller Troubleshooting; Decision-Makert 1 And Decision-Makert 1 Expanded Relay Controller - Kohler 40COZ/33CFOZ Service Manual

Section 6 Decision-Makert 1 Controller Troubleshooting

6.1 Decision-Makert 1 and
Decision-Makert 1
Expanded Relay Controller
The following text covers the relay controller sequence
of operation during generator start, run, stop, and fault
shutdown modes. Use this information as a starting
point for controller fault identification. See Section 2 to
identify controller external components. See Figure 6-1
and Figure 6-2 to identify internal components of the
relay controller. Use the LEDs on the controller circuit
board to assist in the troubleshooting process. An
illuminated LED indicates the respective relay is
receiving power; the LED does not indicate whether that
relay is energized. See Figure 6-3 and Figure 6-4.
2
1
7
11
1. TB1 AC terminal block
2. Governor
3. Controller main circuit board (E-254717 COZ models or
F-254717 EOZ models)
4. 15-amp fuse
5. K5 relay
6. Ground strap
7. Hourmeter (front panel)
8. Fault lamp (front panel)
9. Voltage adjust potentiometer (front panel)
10. 10-amp fuse (front panel)
11. Generator set master switch (front panel)
Figure 6-1 Decision-Makerä 1 Relay Controller
Internal Components
TP-5737 5/01
3
4
5
6
8
9
10
A-336597A-D
1 2 3
7
11
1. TB2 terminal block
2. Governor
3. K5 relay
4. Controller main circuit board (E-254717 COZ models or
F-254717 EOZ models)
5. TB1 AC terminal block
6. Ground strap
7. Fault lamp (front panel)
8. Hourmeter (front panel)
9. Generator set master switch (front panel)
10. Voltage adjust potentiometer (front panel)
11. 10-amp fuse (front panel)
Figure 6-2 Decision-Makerä 1 Expanded
Relay Controller Internal Components
A change in the circuit board affects the function of some
relays. Circuit board E-254717 has four internal relays
with an external K5 relay for engine run components.
Circuit board F-254717 has five relays with an external
K10 relay for engine run components. The fifth relay
designated K5 latches the fault lamp during fault
shutdown when in the auto/remote start mode.
Although the circuit boards are similar, the changes
relating to K5/K10 alter the troubleshooting information.
Section 6 Decision-Makert 1 Controller Troubleshooting
4 5
6
10 9 8
A-336598A-K
45