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Top Products
BATTERY, STARTER, ENGINE,
GLOW PLUGS, ENGINE
PROTECTION, ROTOR, STATOR
AND IDLER SOLENOID
The 12VDC battery powers the starter motor and glow
plugs. The glow plugs are used to preheat the diesel
engine to enhance starting. When the engine is start-
ed and running, the battery circuit voltage is fed
through the printed circuit board to the rotating field
coil in the rotor via a brush and slip ring configuration.
This excitation (“flashing”) voltage magnetizes the
rotor lamination. The rotor is mechanically coupled to
the engine. This rotating magnet induces a voltage in
the stationary windings of the main alternator (stator).
There are four separate and isolated windings incorpo-
rated in the stator lamination assembly. Each set has
a different number of turns producing different magni-
tudes of AC output voltages. These four windings are
the weld winding, the auxiliary power winding, the field
feedback winding and the auxiliary power winding for
wire feeders. The field feedback winding provides
rotor current during machine operation. The output of
the Ranger 300 is dependent on two criteria, the
engine RPM and the amount of current in the rotor
winding.
The engine alternator supplies “charging” current for
the battery circuit. The battery circuit provides power
for the printed circuit board and also for the idler sole-
noid. The idler solenoid is mechanically connected to
the engine's throttle linkage. If welding or auxiliary
current is being drawn from the Ranger 300, the print-
ed circuit board activates the idler solenoid, which
then brings the engine to the high RPM state. When
no output current is sensed, either weld or auxiliary,
the printed circuit board deactivates the idler solenoid
and the engine returns to low RPM.
The engine protection circuit shuts the engine off in the
event of low oil pressure or engine coolant over-tem-
perature.
THEORY OF OPERATION
E-2 E-2
RANGER 300 D AND 300 DLX
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FIGURE E.2
BATTERY, STARTER, ENGINE, GLOW PLUGS,ENGINE PROTECTION,
ROTOR, STATOR AND IDLER SOLENOID
NOTE: Unshaded areas of Block Logic Diagram are the subject of discussion.
RANGE
SWITCH
REACTOR
STATOR
ROTOR
MECHANICAL
ROTATION
ENGINE
GLOW PLUGS
BATTERY
6 PIN
AMPHENOL
14 PIN
AMPHENOL
OUTPUT
CONTROL
REMOTE
SWITCH
BY-PASS
BOARD
SHUTDOWN
SOLENOID
STARTER
MOTOR
ALTERNATOR
IDLER
SOLENOID
PRINTED
CIRCUIT
BOARD
FIELD
CAPACITOR
FIELD
BRIDGE
115 & 230VAC
RECEPTACLES
AC
AC
OUTPUT
RECTIFIER
BRIDGE
CAPACITORS
PART OF
RANGE
SWITCH
CHOKE
POLARITY
SWITCH
WORK
TERMINAL
ELECTRODE
TERMINAL
CONTACTOR CLOSURE
ROTOR
SLIP
RINGS
42VAC
115VAC
cv
output
contactor
CONTACTOR CLOSURE
OIL &
WATER
SENSORS
RANGER 300 DLX