CONTROl
DESCRIPTION
(Mechanical governor gensets)
The generator set control consists
of
the compo-
nents listed below (see Figure
7-1
):
• Control panel assembly
• Printed circuit board
(A
1)
• Start/Run/Stop switch (S1)
• Fuse (F1}
• Fuse (F2)
• Start solenoid (K1)
• Stop latch relay (K5)
• Fuel valve solenoid (E4)
• Fuel pump (E3)
• Remote start control
• Circuit breaker(s)
• Voltage regulator (VR1)
• Terminal board (TB1)
Control
Panel
Assembly
The control panel assembly consists of:
• Printed circuit board
(A
1)
• Start/Run/Stop switch (S1}
• Fuse (F1)
• Fuse (F2)
Printed
Circuit
Board
(A 1
):
The printed circuit
board controls
the
engine start, start disconnect/
run, and stop functions. It is mounted the rear
of
the control panel. It contains
V\i'iring
harness con-
nections
to
the engine, generator, and remote start
control;
the
start-stop switch
(S1
); and the control
fuse (F1).
Start/Run/Stop
Switch
(S1):S1
is
a
switch which starts and stops the
The switch
returns to the center (run)
oos~tlm
released.
lt
is mounted on the circuit board,
not field-replaceable.
panel. Spare fuses are inside the fuse holder; use
only Onan-supplied 5-amp fuses.
Fuse (F2): This slow-blow 5-amp fuse protects the
fuel pump circuit from overcurrent conditions. It is
removable from the front
of
the control panel.
Spare fuses are inside the
F1
fuse holder; use only
Onan-supplied fuses.
Start Solenoid (K1}
The
K1
start solenoid opens and closes the circuit
between the starter motor and the battery. The
starting current load requires that the solenoid con-
tacts have a 300-amp contact rating.
A single ter-
minal connects to the 12-volt solenoid coil.
Two
studs provide connection points
to
the battery and
starter cables; the battery B+ stud connection pro-
trudes through
the
control panel to the outside
of
the control housing for convenient access.
Stop Latch Relay (K5}
The K5 stop latch relay latches the generator set
off
when switch
S1
is moved to the STOP position.
This prevents the set from restarting when the
switch is momentarily placed in the STOP position,
then released. The K5 relay is located inside the
control box.
Fuel
Pump (E3}, Fuel Valve Solenoid (E4}
The E3 fuel
pump
is
initially energized (through
CR9) at the same time the start solenoid
K1
is ener-
gized, by closure
of
start relay
K4
contacts. After
the set is started, fuel pump relay K6
is deactivated
and the fuel pump then receives its current through
a separate connection. Fuel pump power
is
recti-
fied to
DC
by
CR
1
0.
CR9 then serves
as
a blocking
diode to prevent current flow
to
start solenoid
K1
and fuel pump relay
KS.
Fuel valve solenoid
E4
parallels fuel pump E3; it
serves
as
a safety measure by blocking fuel flow
when the fuel pump
is
not activated.
~~~mote
Start Control
remote start control enables the generator set
deluxe
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