Running - Kohler 10CCOZ61 Service Manual

Running

During engine startup, flashing current is provided to the
generator exciter field through a normally open contact
of the K2 relay and normally closed contacts of the K1
relay. The resulting generator output from the B1/B2
stator winding, rectified and limited to a 12 VDC level,
energizes the K1 relay (LED1 lights). After a 5 to 10
second delay, the K5 relay is energized (LED5 lights).
Both relays remain energized during normal running.
Energizing the K1 relay opens the normally closed K1A
and K1B contacts that supply flashing current to the
generator exciter field. Field exciter current for
continued operation is then supplied by the voltage
regulator, operating from an input supplied by generator
stator winding 55/66.
Energizing the K1 relay opens the normally closed K1C
contacts between the Start/Stop switch and the K2 relay
in the engine startup circuit. However, at the same time,
the normally open K1D contacts close to keep the K2
relay energized in order to maintain operating power for
the other relays and the hourmeter, oil pressure gauge,
water temperature gauge, and battery voltage gauge on
the controller front panel as well as the overspeed
protection circuit board within the controller.
Energizing the K1 relay opens the normally closed K1E
contacts to de-energize the K3 relay. As a result, K20
and the S (Starter) solenoid de-energize to disengage
and de-energize the starter motor, even when the
Start/Stop switch is held in the Start position. The other
devices energized during engine starting, that is relay
K25, the fuel pump, and the fuel solenoid, remain
energized to keep the engine running and to supply
excitation to the B.C. Alt (battery charging alternator).
Finally, energizing the K1 relay closes the normally open
K1F contacts to supply a high to the F (Fault) light. The
fault light and the shutdown switches that activate it are
explained in the Safety Shutdown paragraph on the next
page.
5-2 Controller Troubleshooting
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 5-2. Sequence of Operation, Running
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
TP-5648 8/93