Lincoln Electric POWER-ARC 4000 SVM103-A Service Manual page 40

E-3
ENGINE
MECHANICAL
ROTATION
WELD WINDING AND REACTOR
The AC voltage developed in the stator weld winding
is delivered, through the reactor, to the machine out-
put terminals. The PowerArc 4000 provides the user
with 125 amps of constant current AC welding for
stick electrodes. The reactor stores energy, and this
energy is released into the welding arc when the AC
voltage passes through the zero point. In this manner
the reactor enhances and stabilizes the AC welding
arc. The reactor is designed to provide optimum
welding characteristics when used with the recom-
mended electrodes.
NOTE: Unshaded areas of Block Logic Diagram are the subject of discussion.
POWER-ARC 4000
THEORY OF OPERATION
FIGURE E.4 – WELDING OUTPUT SHADE
ROTOR
SLIP
RINGS
CAPACITOR
RHEOSTAT
REACTOR
STATOR
ROTOR
STATOR
115 AND 230VAC
RECEPTACLES
BRIDGE
AUXILIARY POWER
OVERCURRENT PROTECTION
The 4000 watt auxiliary power winding and circuitry is
protected from an overload condition by two 20 amp
circuit breakers. The circuit breakers are located
below the output receptacles. They can be manually
reset.
OUTPUT
TERMINALS