GMC 1976 ZEO 6083 Maintenance Manual page 724

*N .L . - No Load
F.L . - Full Load
OPERATION (FIGURE 90)
STARTING:
Push start switch S3 . Battery current flows thru
K1 solenoid, K2 contacts and start switch S3 to
battery negative (GND). K 1 solenoid closes con
tacts, feeding current to starter motor and to choke
El plus K3 relay. K3 relay contacts close the circuit
to the ignition coil T1 and fuel pump E2 plus fuel
solenoid K4. The engine cranks and the fuel pump,
fuel solenoid, and ignition operate to start the engine .
The remote start switch is connected as shown in
Figure 91 .
NOTE :
For details on control panel, refer to fig-
ures 92 and 93 .
ENGINE STARTS :
When the starting rpm increases, the alternator
develops a voltage great enough to be rectified and
energize relay K2 . Relay K2 contacts close to hold
relay K3 energized, and K2 normally closed contacts
open to drop K1 start solenoid . K3 contacts main-
tain current to ignition coil, fuel pump, and fuel
solenoid. The engine continues running and K2 re-
mains energized.
STOP ENGINE:
Relay K3, energized by K2, maintains ignition.
To stop engine, push the stop switch which shorts
out K3 . Relay K3 drops out to remove power from
the fuel pump, fuel solenoid and ignition coil. Resis-
tor R2 absorbs the power that was supplied to K3
during the period the stop switch is held close as the
engine slows to a stop .
GENERATOR VALUES FOR 4KW
GENERATOR VALUES FOR 6KW
CONTROLS
ONAN MOTOR GENERATOR
24C- 4 7
LOW OIL PRESSURE SHUTDOWN :
The control has a built-in time delay of 2 to 4
BTI
BTI . . . . . . . . . . . . . . . . . . . . . . . . . Battery
B1 . . . . . . . . . . . . . . . . . . . . . . . . . . Starter
EI . . . . . . . . . . . . . . . . . . .Electric Choke
E2 . . . . . . . . . . . . . . . . . . . . . . Fuel Pump
E9, E4 . . . . . . . . . . . . . . . . . Spark Plugs
F1 . . . . . . . . . . . . . . . . . . . . . 5 amp. Fuse
G1 . . . . . . . . . . . . . . . . . . . . . . Alternator
K1 . . . . . . . . . . . . . . . . . . . Start Solenoid
St . . . . . . . . . . . . . . . . . . . . . Breaker Box
S2 . . . . . . . . . Low Oil Pressure Switch
S3 . . . . . . . . . . . . . . . . Start-Stop Switch
Ti . . . . . . . . . . . . . . . . . . . . . Ignition Coil
VR1 . . . . . . . . . . . . . . .Voltage Regulator
RTM . . . . .Running Time Meter (Opt .)
BCM . Battery Condition Meter (Opt .)
K4 . . . . . . . . . . . . . . . . . . . .Fuel Solenoid
A-4961
Figure 90-Control System Schematic
MODEL
TYPICAL
N.L . VOLTS
TYPICAL
F.L . VOLTS
N.L . VOLTS
X1 to H1
N .L. VOLTS
F1 to F2
RESISTANCE
F1 to F2
RESISTANCE
H1 to X1
CURRENT
FULL LOAD
4KW 125 112 100 VAC 40V DC 28 Ohms 0.83 Ohms 33 Amps
MODEL
TYPICAL
N.L . VOLTS
TYPICAL
F.L . VOLTS
N.L . VOLTS
X1 to H1
N.L . VOLTS
F1 to F2
RESISTANCE
F1 to F2
RESISTANCE
H1 to X1
CURRENT
FULL LOAD
6KW 123
I
113 80 VAC 50V DC
38 Ohms 0.85 Ohms 50 Amps