Auxiliary Power - Lincoln Electric BULLDOG SVM208-A Service Manual

E-3
FIGURE E.3 - ROTOR FIELD FEEDBACK AND AUXILIARY POWER
ENGINE
MAGNETO
ROTOR FIELD FEEDBACK AND

AUXILIARY POWER

The AC voltage developed in the field winding is fed to
the full wave bridge. The DC output of the bridge is fil-
tered by the field capacitor and controlled by the output
rheostat.
This filtered and controlled feedback 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 likewise increased or decreased.
THEORY OF OPERATION
MECHANICAL
ROTATION
ROTOR
SLIP
RINGS
CAPACITOR
RHEOSTAT
NOTE: Unshaded areas of Block Logic
Diagram are the subject of discussion
BULLDOG® 140
REACTOR
STATOR
ROTOR
STATOR
115 AND 230VAC
RECEPTACLES
BRIDGE
When full field voltage is applied to the rotor and the
engine is running at high speed (3700 RPM), a 230
VAC voltage is developed in the stator auxiliary wind-
ing. This winding is tapped to provide 115 VAC. The
two voltages (115 VAC and 230 VAC) are connected to
the appropriate receptacles and offer 5500 watts (total)
of AC power.
E-3
OUTPUT
TERMINALS