Stopping - Kohler 10CCOZ61 Service Manual

Stopping

Normal Stop. A normal stop is initiated by rocking the
Start/Stop Switch on the controller front panel to the
Stop position and then releasing the switch. Holding
the switch in the Stop position energizes the GP
relay, causing further, unnecessary heating of the
glow plugs. In the Stop position, the Start/Stop switch
provides a ground through two blocking diodes to
energize the K4 relay (LED4 lights). The normally open
K4A contacts then close, latching the K4 relay in an
energized condition.
At the same time, normally closed K4B contacts open to
de-energize the FP (fuel pump) motor and the K25 relay.
The normally open K25 contacts then open to
de-energize the FS (fuel) solenoid, turning off the flow of
fuel. With the fuel supply and fuel pump both turned off,
the engine turns off.
With the engine turned off, the generator output decays
and causes relays K1 and K5 to de-energize (LED1 and
LED5 go out). The normally open K1D contacts then
open, de-energizing the K2 relay (LED2 goes out) and
opening the normally open K2 contacts to interrupt
power to the remaining controller relay circuits,
including relay K4. As a result, the latch-up of the K4
relay is broken to return the controller circuits to a normal
pre-start condition.
Emergency Stop. An emergency stop is initiated by
depressing the Emergency Stop Switch on the
controller front panel. The Emergency Stop Switch is
intended only for emergency conditions; the
Start/Stop Switch should be used for normal stops.
Depressing the Emergency Stop Switch (ES) opens the
normally closed ES contacts, interrupting power to the
controller relay circuits to cause immediate turnoff of the
FP (fuel pump) motor and the FS (fuel) solenoid. With
the fuel supply and fuel pump both turned off, the engine
turns off and the generator output decays.
When it is activated, the Emergency Stop Switch locks in
the depressed position. Before the set can be started
again, it is necessary to rotate the switch and release the
locking mechanism so the normally closed ES contacts
can close and restore power to the controller circuits.
TP-5648 8/93
12 VDC
GP
S
K25
10 A.
B.C.
ALT
K20
10 A.
ES
LED2
K2
K3
K20
LED3
K2
K3
K4B
K25
FP
K1F
F
K5
FROM SAFETY
LED4
SHUTDOWN
SWITCHES
K4
K7
K7
K6
OP
HR
WT
BV
K1A K1B
1.5 A.
VOLTAGE
REGULATOR
MAIN FIELD
LED1
K1 K5
Figure 5-3. Sequence of Operation, Stopping
GLOW PLUGS
GP
M
FS
STOP/
PREHEAT
START
S
K1C
K1D
K1E
K4A
K2
SDR
K7
V
1.5 A.
HZ
L2
LO
A2
A1
LO
L1
LED5
OVERSPEED
PROTECTION SDR
CIRCUIT BOARD
Controller Troubleshooting 5-3