Sl-Start/Run/Stop switch
S2-Low oil pressure cut-out switch
S3-Breaker points
CR1-Power rectifier
CRCField rectifier
F1-Fuse
B1-Starter motor
G1-Generator
El-Spark plug
E2-Spark plug
E3-Fuel solenoid
RG-Battery charge
resistor
K1-Start solenoid
KBGenerator relay
(AC)
K3-Run relay
K4-Start relay
K5-Stop relay
FIGURE
7-5
TYPICAL CONTROL SCHEMATIC
-
LP GAS
NHEL CONTROL OPERATION
This operation description applies to
NHEL
series
generator sets. The schematic diagram shown in Fig-
ure
7-5
is intended as an example to help follow the
circuit description. Always referto thespecific wiring
diagram that corresponds to the model and spec
number
of
the generator set when troubleshooting
problems.
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 connect
battery positive
(B+)
to the generator field windings
(CR4+),
T1 Ignition coil, E3 fuel solenoid valve, K5
stop relay, and K1 start solenoid. Connecting
B+
as
described produces the following control responses:
Flashes the field to ensure that there is adequate
residual magnetism to induce voltage build up.
Energizes the ignition coil
(Tl)
so
it can begin
producing an ignition spark when the breaker
points open and close.
Energizes the fuel solenoid valve (E3) which
opens to allow fuel to flow to the carburetor.
Energizes the K5 stop relay to open the K5
contacts.
0
Energizes the K1 start solenoid to close the K1
contacts.
Opening the K5 stop relay contacts opens the circuit
that holds the K3 run relay grounded. This allows the
K3 relay to energize when connected to
B+.
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.
Starter
Lock-Out
-
Run
When the engine starts, the low oil pressure switch
(S2)
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 K2
generator relay. This energizes the K2 relay which
closes one set
of
contacts (K2-2,5) that connects
B+
to the K3 run relay. This energizes the K3 relay which
opens two sets of contacts and closes two sets of
7-9
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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