Starting
Placing the start/stop switch (Sl) in the start position
connects battery negative (B-) to the start relay coil (Kl).
This energizes the start relay, which closes the K1-
1
/K1-2 relay contacts that connect battery positive (B+)
to the starter motor (Bl).
It
also connects B+ to the fuel
pump (E2) and the K3 relay, through fuse F2 and diode
CR1. (The fuel pump is energized through diode
CR3,
used to bypass ballast resistor
R2,
on initial production
sets. CR3 and
R2
may not be used on later production
sets. Battery positive (B+) is also supplied to the voltage
regulator (pin
7),
for the generator field winding, through
the start disconnect relay (K2) normally closed contacts
(K2-2/ K2-6).
Connecting battery positive (B+)
as
described produces
the following control responses:
0
Flashes the generator field winding to ensure that
there is adequate residual magnetism to inducevol-
tage buildup.
0
Energizes the starter motor
(81).
0
Energizes the fuel pump (E2) which begins pumping
0
Energizes relay K3.
fuel to the carburetor.
Closing the start solenoid (Kl) contacts connects the
battery positive
(B+)
to the starter motor, which begins to
crank the engine to initiate starting.
Starter Lockout-Run
As the engine comes up to speed, the power output from
the generator is applied to the start disconnect relay (K2)
and causes it to energize. Engergizing the K2 relay
opens the K2-1/K2-5 and K2-2/K2-6 contacts and
closes the K2-3/K2-5 contacts. This produces the fol-
lowing control responses:
0
Opening the K2-1 /K2-5 contacts disconnects
B+
from the start solenoid (Kl) de-energizing it and
causing the
K1-1
/K1-2 contacts to open. This dis-
connects B+ from the start motor (Bl).
0
Opening the K2-2/K2-6 contacts disconnects
B+
from the voltage regulator
0
Closing the K2-3/K2-5 contacts applies B+ to the
fuel pump
(E2)
and to the K3 relay, through fuse
F1,
providing fuel flow to the carburetor and ignition
voltage from the magneto assembly
(G2)
to the
spark plug (El).
As the engine begins to run, the start/stop switch
should be released. The switch will automatically return
to the center (Run) position and the engine will continue
to run. The start disconnect relay (K2) will remain ener-
gized and the start solenoid (Kl) remains de-energized.
Charging Circuit
The charging circuit supplies voltage to the choke
heater element (Hl), which activates the heating ele-
ment and opens the choke. The charging circuit also
supplies generator battery charge voltage (20
f
2 volts)
that is rectified to DC by diode (CR2) and supplied
to
the
battery through the charge resistor
(Rl).
This charges
the battery at a variable rate
(1
ampere maximum) during
set operation. The charge rate varies with the generator
load and battery condition.
Stopping
Placing the start/stop switch
(SI)
in the stop position
energizes the K5 relay, which opens K5-301K5-87A
relay contacts.This removes B+from the fuel pump
(E2),
stopping fuel flow to the carburetor. B+ is also removed
from relay K3, which causes the K3-30IK3-87A con-
tacts
to
close and ground the output from the magneto
assembly
(G2).
Placing the start/stop switch in the stop
position also energizes solenoid K4, which pushes
against the governor arm causing it to close the throttle.
Each
of
these actions work together to shut down the
generator set.
As the generator output voltage drops, the start discon-
nect relay (K2) de-energizes, opening contacts
K2-3/K2-5.
Diode CR2 prevents the battery from discharging
through the generator windings when the set is not
running.
7-2
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