JLG M4069 ANSI Service Manual - Manual (Page 41)

SECTION 3 - CHASSIS & SCISSOR ARMS
3121122 – JLG Lift – 3-13
3.4 GENERATOR
NOTE: Throughout the Generator section, the abbreviations
RBS and CTS are used. RBS stands for Rotary Bat-
tery System, which is the generator system. CTS
stands for Call To Start, which is the electronic inputs
which signal the generator to start and charge the
batteries.
The generator consists of a drive engine, controller, and
related components.
• Alternator
The alternator is a brushless, DC output alternator. The
3 phase output of the alternator is full wave rectified
and directed to the output terminator.
The output rating is 58 volts DC at 45 amps. Voltage
regulation and current limiting is provided by the
Engine/Generator Controller.
The rectifier diodes and output current sensor are
located in the alternator end.
• Dynamo and Dynamo Voltage Regulator
For machines equipped with a YANMAR engine:
12 Volt, 15 Amp DC output dynamo.
For machines equipped with a KUBOTA engine:
12 Volt, 5 to 7 Amp DC output dyamo.
• Dynamo Output Fuse
The dynamo output fuse is used to protect the output
of the dynamo. This fuse is rated at 20 Amps DC, slow
blow and is located on the left side of the engine.
• Control Fuse
This fuse provides power to the engine/generator and
the relays for start control, fuel control, and pre-heater.
This fuse is rated at 15 Amps DC and is located on the
right side of the engine.
• Start Battery
A 12 volt lead-acid battery is utilized to provide starting
power for the generator and power for the generator
controls. This battery is charged by the engine dynamo
and dynamo regulator when the engine is running.
• Engine Starter
The engine is equipped with a 12 Volt DC starter. This
starter provides mechanical power to crank the engine.
Electrical power for the starter is provided by the start
battery. The starter is energized by the start control
relay.
• Start Control Relay
The start control relay energizes the solenoid of the
engine starter and the pull coil of the engine fuel sole-
noid. The start control relay is located on the fuel sole-
noid bracket on the right side of the engine. The start
control relay is energized by the engine/generator con-
troller.
• Fuel Control Relay
The fuel control relay energizes the hold coil of the fuel
solenoid. The fuel control relay is energized by the
engine/generator controller.
• Fuel Solenoid
The fuel solenoid actuates the run/stop lever of the
engine. This solenoid has a pull and hold coil. The pull
coil is energized by the start control relay and the hold
coil is energized by the fuel control relay.
• Engine Oil Temperature Sensor
The engine oil temperature sensor is used to sense the
temperature of the oil in the sump of the engine. This
sensor provides a signal to the engine/generator con-
troller for high engine temperature shutdown.
• Alternator Output Current Sensor
The alternator output current sensor provides a signal
proportional to the output current of the alternator to
the engine/generator controller. This signal is used by
the controller to regulate the current output of the alter-
nator. The output current is regulated at 55 Amps DC.
The alternator output current sensor is located inside
the rear cover of the alternator.
• Engine Speed Sensor
The engine speed sensor provides a signal propor-
tional to the rotational speed of the engine to the
engine/generator controller. This signal is used by the
controller to determine starter cut-out, overspeed fault,
and underspeed fault. This signal has failsafe protec-
tion, if it is not present at the controller, the unit will fault
with a loss of speed signal indication. The engine
speed sensor is located inside the recoil starter cover
at the front of the engine.
• Engine Low Oil Pressure Switch
The engine is equipped with a low oil pressure switch.
The switch is closed when the oil pressure is below
14.2 psi (1 Bar).