NOTE
On earlier models a 10 Amp fuse is mounted in-
line between the controller and ignition coil.
See the wiring diagram, It protects the control-
ler in the event of a shorted or failed ignition
coil, fuel pump, choke heater, shut-down con-
trol or engine wiring.
NOTE
If the 10 Amp in-line fuse is blown the engine
will not crank. If the 10 Amp fuse inside the
controller is blown the engine will crank but
not start. If either fuse blows while the engine
is running, the set will stop.
NOTE
On 4.5 (twin) & 7.5kW models, a self-resetting
circuit breaker located in the generator end
bracket protects the battery charging circuit.
The 7.5kW model uses an 8 Amp circuit break-
er. The 4.5kW (twin) and early 7.5kW models
5-5. RELAYS
There are four relays in the generator set. One relay is lo-
cated in the generator end bracket (Figure 6-7). The other
three relays are mounted inside the controller. Refer to
Figure 5-8 when checking or replacing relays. The function
of each relay is described below.
. ICR (STOP RELAY)
- When energized, deenergizes
the 2CR relay.
l 2CR (IGNITION RELAY) - When energized, pro-
vides battery supply to the engine electrical system.
l 3CR (INTERLOCK RELAY) - When energized, de-
energizes the
“C” cranking contactor, and provides
current to energize the ICR relay upon closing of the
engine safety cutouts.
l 4CR (VOLTAGE SENSING RELAY) - When ener-
gized, disconnects excitation current from battery to
regulator and field (V.B.U.), and energizes the 3CR
relay. (The 4CR relay is located inside the generator
end bracket.)
use a 5 Amp circuit breaker.
5-4. REl DIODE
A diode is located in-line between
the start-stop switch and
the 2CR relay to protect against
reverse battery polarity.
When replacing the diode, make
certain connections are
made with the arrow on the diode directing away from the
start-stop switch (Figure 5-8).
STARTING 1 RUNNING 1 STOPPING
“C” contactor
energized
2CR relay
energized
4CR relay
energized
3CR relay
energized
2CR relay
energized
’ 1CR relay
energized
5-5
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