Starting
Moving the Start/Run/Stop switch
to
the Start posi-
tion connects battery ground (B-)
to
relays A
1-K3
and A 1-K1. Normally-open contacts
on
A
1-K3
close, connecting
B+
to
the
following:
•
Governor
control board
A4
•Relay
K4
• Ignition coil
T1
• Start solenoid
K1
(through N.C. contacts
of
A
1-K2
relay
• Relay K2 (through resistors
R1
and R2)
Normally-open contacts on relay
K1
close,
connecting
B+
to
the following:
• Voltage regulator
VR1
(to build-up exciter)
NOTE:
Pre..Spec
D generator sets have fuel pumps
that are powered directly rather than through
K4
contacts. Otherwise their control functions are
Identical
to
those described here.
The following control responses take place:
•
Governor
control board A4
moves
the
throttle
to
an
open position
after
a 1-second delay.
•
K4
relay contacts close
to
provide
power
to
fuel
pump
E3 and fuel
pump
solenoid E4.
•
The
field
is
flashed
to
provide residual
magnet-
ism
to
buildup.
J1-3
is
ener-
gized.
• Ignition coil
T1
is energized,
to
begin
produc-
ing sparks
when
ignition
module
83
is acti-
vated.
• Start solenoid
K1
is energized, connecting
B+
to
the
starter motor, which cranks
the
engine
for
starting.
1,\1
Solenoid tuel valve
E4
(see Figure
iS
releasing fuel
to
the
carburetor"
When
governor
control board
A4
determines that
the
generator
reaches
1150
RPM, it connects
ground to relay
A 1-K2. A
1-K2
contacts open, which
opens
the
exciter
circuit
after
initial start and closes
another
circuit
to
the fuel
pump
and ignition coil af-
ter
K3
is
de-energized.
Starter
Lockout-Run
When
the
engine
cranks, the
low
oil pressure
switch is bypassed until
the
engine reaches operat-
ing speed. Normally,
with
the engine running, the
switch is open.
When
the
StarVRun/Stop switch is
released
and
returns
to
center
(Run) position, the
engine continues
to
run. A
1-K3
is de-energized,
opening the B+ line to
the
field exciter,
governor
control board, start solenoid, fuel
pump
and
fuel
valve solenoid.
At
the
same
time, A
1-K2
is
ener-
gized, and A
1-K2
contacts open which block the
start solenoid from being activated while the set is
running.
Another
set
of
K2 contacts close
to
con-
tinue
to
provide
power
to
the
fuel pump, fuel valve
solenoid, ignition coil
and
governor
controller.
(On electronic-governor
generator
sets, the engine
can
be
started and run,
even
ifthe
lead
to
the
low
oil
pressure switch is disconnected
or
missing,
as
long
as
this lead is not grounded.)
Off
the
control board, bridge rectifier C R 1 0 receives
AC voltage through
generator
leads
81/82,
and
provides DC voltage
through
battery charge resis-
tor
R1
to
charge
the
starting battery.
On
pre-Spec
D gensets, the B1/B2 connection is paralleled
to
power
the
choke
heater
element, opening the
choke.
On
Spec
D sets, the autochoke
is
powered
directly
by
B+
voltage.
Stopping
Moving start-stop switch
S1
to
the
STOP
position
grounds
resistors A 1-R1
and
A 1-R2. The
governor
actuator
responds
by
closing the throttle, cutting
off
'fuel
to
the engine. Relay A 1-K2 Is de-energized,
dlsconnecting
the
B+
line from the fuei
pump
and
:gnition coil.
shutdown.
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