Lincoln Electric RANGER 9 SVM 110-A Service Manual page 53

E-3
FIGURE E.3 – ROTOR FIELD FEEDBACK, AUXILIARY, AND WIRE FEEDER POWER
STARTER
FLYWHEEL
ALTERNATOR
BY-PASS
BOARD
CONTACTOR CLOSURE
OUTPUT
CONTROL
115VAC
42VAC
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 bridge
is filtered by the field capacitor and controlled by the
printed circuit board according to the output control
setting. This filtered and controlled voltage is fed to
the rotor winding via the brush and slip ring configura-
tion. As the feedback voltage is increased or de-
creased, the outputs of the weld and auxiliary windings
are increased or decreased.
NOTE: Unshaded areas of Block Logic Diagram are the subject of discussion.
RANGER 9
THEORY OF OPERATION
MECHANICAL
ROTATION
ENGINE ROTOR
SLIP
RINGS
IDLER
SOLENOID
PRINTER
CIRCUT
BOARD
BATTERY
FIELD
CAPACITOR
REMOTE
SWITCH
RANGE
SWITCH
AC
OUTPUT
RECTIFIER
BRIDGE
REACTOR
AC
STATOR
ROTOR
115 & 230VAC
RECEPTACLES
FIELD
BRIDGE
When full field voltage is applied to the rotor and the
engine is running at high speed (3700 RPM), a 230 AC
voltage is developed in the stator auxiliary winding.
This winding is tapped to provide 115 VAC. The two
voltages (115 VAC and 230 VAC), are connected to the
appropriate receptacles and offer 9000 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.
CHOKE
TERMINAL
PART OF
RANGE
SWITCH
CAPACITORS
OUTPUT
CONTACTOR
ELECTRODE
TERMINAL
CONTACTOR CLOSURE
RANGER 9
E-3
WORK