Lincoln Electric RANGER 8 SVM107-B Service Manual page 37

E-3
FIGURE E.3 – ROTOR FIELD FEEDBACK AND AUXILIARY POWER
STARTER ENGINE
FLYWHEEL
ALTERNATOR
BATTERY
OUTPUT
CONTROL
ROTOR FIELD FEEDBACK AND
AUXILIARY 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.
THEORY OF OPERATION
REACTOR
MECHANICAL
ROTATION
ROTOR
SLIP
RINGS
IDLER
SOLENOID
PRINTED
CIRCUT
BOARD
FIELD
CAPACITOR
FIELD
BRIDGE
RANGER 8
RANGE
SWITCH
AC
OUTPUT CHOKE
BRIDGE
AC
STATOR
ROTOR
STATOR
115 & 230VAC
RECEPTACLES
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 8000 watts (total)
of AC power.
E-3
ELECTRODE
TERMINAL
POLARITY
SWITCH
WORK
TERMINAL