CONTROL PANEL
\
PC
BOARD
ASSEMBLY
fi
REAR VIEW
REMOTE CONNECTOR
SOCKET. NOTE TAB IS
AT
BOTTOM
OF
SOCKET
STOP
GND STRT
COMPONENT SIDE
FIGURE
7-3.
NHE CONTROL PANEL ASSEMBLY
Starting
Placing the Start/Run/Stop switch in the Start posi-
tion connects battery ground (B-) to the K4 start
relay. This energizes the K4 relay which closes two
sets of contacts (K4-2,8 and K4-9,15) that connects
battery positive
(B+)
to
the generator field windings
(CR4+), T1 ignition coil, E3 fuel pump, and K1 start
solenoid. Connecting B+ as described produces the
following control responses:
0
Flashes the field to ensure that there is adequate
residual magnetism to induce voltage build-up.
0
Energizes the ignition coil (T1
)
so
it
can produce an
ignition spark when the breaker points open and
close.
Energizes the fuel pump (E3) which begins pump-
ing fuel to the carburetor.
Energizes the K1 start solenoid to close the K1
contacts.
Closing the K1 start solenoid contacts connects
B+
to
the starter motor. This energizes the starter motor
which begins to crank the engine to initiate starting.
SC-1521
Starter Lock-Out-Run
When the engine starts, the low oil pressure switch
(52) closes to connect battery ground (B-) to the K3
run relay.
As
the engine comes
up
to speed, AC out-
put voltage from the generator is supplied to the
choke heater element (Hl) and to the K2 generator
relay. This activates the heating element (which
opens the choke) and also energizes the K2 relay.
Energizing the K2 relay closes one set of contacts
(K2-23) that connect B+ to the K3 run relay. This
energizes the K3 relay which opens two sets of con-
tacts to produce the following control responses:
Closing the K3-9,15 contacts (which parallel the
K4-2,8 contacts) provides an alternate pathway for
supplying
B+
to the T1 ignition coil and
E3
fuel
Pump.
0
Opening the K3-1,8 contacts disconnects B+ (CR4
positive terminal) from the generator field wind-
ings.
o
Closing the K3-2,8 contacts connects B+ to run
light, time meter, and battery condition meter.
0
Opening the K3-9,16 contacts disconnects B+from
the K4 start relay causing
it
to de-energize.
7-3
Redistribution or publication of this document
by any means, is strictly prohibited.
Redistribution or publication of this document
by any means, is strictly prohibited.
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