Section
7.
Control
INTRODUCTION
The control system includes all functions that relate to
starting, monitoring
for
fault conditions, instrumentation,
battery charging, and stopping. This section covers how
the control operates, where the components are
located, and basic troubleshooting procedures.
CONTROL DESCRIPTION
The generator set control consists
of
the following
components:
0
Panel mounted Start/Stop Switch (Sl)
0
Start Solenoid
(Kl)
0
Start Disconnect Relay (K2)
0
Control Fuses (F1
&
F2)
0
Battery Charge Resistor (Rl)
Shutdown Circuit (K3, K4, K5)*
0
Optional Remote Start Control
Start/Stop Switch
The startlstop switch (Sl) isasingle pole, double throw
(SPDT), rocker-typeswitch used for starting or stopping
the generator set. Placing the switch in either the start or
stop position will initiate the appropriate control func-
tion. The switch will automatically return to the center
(Run) position when released.The switch is mounted on
the control panel and is removable for service re-
placement.
Start Solenoid
The start solenoid (Kl) is used for opening and closing
the circuit between the starter motor and the battery.
The start solenoid is used because of the high current
load imposed during starting.The solenoid is made with
heavy duty contacts to withstand high current draw
during start-up. The start solenoid is located on the left
side of the unit near the base and is not serviceable
through the removable access cover.
Start Disconnect Relay
The start disconnect relay
(K2)
energizes once the
generator set output reaches
70
volts AC. This opens
the circuit between the start solenoid (Kl) and the bat-
tery and causes the starter motor
(Bl)
to stop cranking.
The start disconnect relay also closes the circuit between
the battery and the fuel pump (E2)** and the K3* relay
during generator set operation. The start disconnect
relay is located on the control panel and is removable
for service replacement.
Control
Fuses
Provide protection for the control
box
wiring and remote
wiring from short circuit or other overload. The cranking
fuse provides protection during start-up, and the run-
ning fuse provides protection while the generator set is
running. The control fuses are mounted on the front of
the control panel and are removable for service
replacement.
Battery Charge Resistor
The battery charge resistor limits the battery charge rate
to
no more than
1
ampere. The resistor mounts on top of
the generator and is removable for service replacement.
Shutdown Circuit*
The shutdown circuit consists of two relays (K3,
K5)
and
a solenoid
(K4).
These components work together to
prevent the generator set from running once the start/
stop switch is placed in the stop position.
Both relays are mounted
to
the back side of the set on
the generator end. The solenoid is mounted on top the
engine. These components are removable for service
replacement.
Optional Remote Start/Stop Control
The remote start/stop control is an optional accessory
that allows the generator set
to
be started, monitored,
and stopped from a remote location. The deluxe control
includes a running time meter and a battery condition
meter. Remote control panels are usually mounted
inside the vehicle.
CONTROL OPERATION
-
GASOLINE FUELED
The following section covers the control operation. The
schematic diagram shown in Figure 7-1 can be used to
help follow the circuit description. Always refer
to
the
specific wiring diagram that corresponds
to
the model
and spec number of the generator set when trouble-
shooting.
"Gasoline sets only
**E2 is the fuel pump on gasoline sets and the fuel
solenoid on LPG sets.
7-1
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