De-energizing the K4 relay opens the K4-2,8 and K4-
9,15 relay contacts. Opening the K4-2,8 contacts has
no effect since they are in parallel with the closed
K3-9,15 contacts which connect
B+
to the ignition
coil and thefuel pump. Opening the K4-9,15 contacts
disconnects
B+
from the K1 start solenoid. De-
energizing the K1 start solenoid disconnects B+from
the starter motor which stops cranking.
When the S1 switch is placed in the
RUN
position, the
engine continues to run. Relays K2 (generator relay)
and K3 (run relay) areenergized while relays K1 (start
solenoid) and K4 (start relay) are de-energized.
Generator voltage is rectified to DC by the CR1 power
rectifier and supplied
to
the battery through the
charge resistor
(R6).
This charges the battery at a
constant rate
(1
ampere maximum) during set
operation.
Stopping
Placing the Start/Stop/Run switch (Sl) in the Stop
position grounds the K3 run relay. This de-energizes
the K3 relay which opens the K3-2,8 and K3-9,15 relay
contacts to disconnect B+ from the ignition coil, fuel
Trouble
Engine
Does Not
Crank
solenoid, run light, meters, and K5 solenoid. De-
energizing the
K5
relay closes the K5-30, 87A con-
tacts which holds the K3 relay grounded. This pre-
vents the set from restarting
if
the S1 switch is
released from the Stop position.
Without ignition or fuel, the engine stops. As the
generator output voltage drops, the K2 generator
relay also de-energizes. All components return to
their de-energized position following set shut-down.
CR1 prevents the battery from discharging through
the generator windings while the set is stopped.
,
NHE
CONTROL TROUBLESHOOTING
Use the troubleshooting guide to help locate prob-
lems related to the NHE control. Figures 7-1 and
7-3
show the location
of
most of the control components.
Refer to the wiring diagram in Figure
7-2
for location
of all terminal connections.
The troubleshooting guide is divided into six sec-
tions. After identifying the problem, refer to the guide
for the possible cause and the recommended correc-
tive action.
-
TROUBLESHOOTING
THE
NHE CONTROL
Possible Cause
1.
If
engine cranks at set but
not at remote control panel,
fault is due to:
a. open circuit in remote control
b. remote start switch faulty
2. If engine cranks at remote
control panel but not at set,
fault is due to:
a. open circuit in wiring between
S1 switch and PC board, or
b. faulty S1 switch
3. Insufficient voltage for
cranking due to:
a. Battery not charged, or
b. Terminal connections loose
or dirty
4. Control fuse
F1)
is
open
7-4
Corrective
Action
1
a.
lb.
2a.
2b.
3a.
3b.
Check for continuity and
and correct if circuit is
open
Replace remote start
control switch
Check for continuity and
correct if circuit is open
Replace
S1
switch
Check condition of battery
and recharge or replace
Clean and tighten all
connections at battery,
K1
start solenoid, and
starter motor
can cause severe personal
injury or death. Disconnect
the negative battery
(-)
cable
at the battery ferminal before
servicing.
4.
Replace fuse
(5
ampere)
.
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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