Lincoln Electric RANGER SVM148-B Service Manual page 56

E-3
ROTOR FIELD FEEDBACK, AUXILIARY AND WIRE FEEDER POWER
RANGER 300 DLX
SHUTDOWN
SOLENOID
BY-PASS
BOARD
CONTACTOR CLOSURE
OUTPUT
CONTROL
42VAC
115VAC
6 PIN
14 PIN
AMPHENOL
AMPHENOL
ROTOR FIELD FEEDBACK,
AUXILIARY AND WIRE FEEDER
POWER
The AC voltage developed in the field winding is fed to
the full wave field bridge. The DC output of the field
bridge is filtered by the field capacitor and controlled
by the printed circuit board according to the setting of
the machine's output control or remote control. This
filtered and controlled voltage is fed to the rotor wind-
ing via the brush and slip ring configuration. As the
feedback voltage is increased or decreased, the out-
puts of the weld and auxiliary windings are increased
or decreased.
NOTE: Unshaded areas of Block Logic Diagram are the subject of discussion.
THEORY OF OPERATION
FIGURE E.3
REACTOR
GLOW PLUGS
ENGINE
MECHANICAL
ROTATION
STARTER
MOTOR
OIL &
WATER
SENSORS
IDLER
SOLENOID
ALTERNATOR
BATTERY
REMOTE
SWITCH
RANGER 300 D AND 300 DLX
RANGE
SWITCH
AC
PART OF
RANGE
OUTPUT
SWITCH
RECTIFIER
BRIDGE
AC CAPACITORS
STATOR
ROTOR
ROTOR
SLIP
RINGS
115 & 230VAC
FIELD
RECEPTACLES
BRIDGE
PRINTED
CIRCUIT
BOARD
FIELD
CAPACITOR
When full field voltage is applied to the rotor and the
engine is running at high speed (3600 RPM), a 230VAC
voltage is developed in the stator auxiliary winding.
This winding is tapped to provide 115VAC. The two
voltages (115VAC and 230VAC), are connected to the
appropriate receptacles and offer 12,000 watts (total)
of AC power.
The auxiliary wire feeder winding offers 115VAC and is
tapped to also provide 42VAC. The current draw from
this winding should be limited to 8 amps. These volt-
ages and remote control signals are fed through the
by-pass (filter) board to the amphenol receptacles.
E-3
WORK
TERMINAL
CHOKE
ELECTRODE
cv
TERMINAL
output
contactor
CONTACTOR CLOSURE