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THEORY OF OPERATION
E-2 E-2
Classic III and IIID
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FIGURE E.1a – CLASSIC III BLOCK LOGIC DIAGRAM
GENERAL DESCRIPTION
The Classic III and Classic IIID are heavy duty, engine
driven, DC arc welding power sources capable of pro-
viding constant current output for stick welding or DC
TIG welding. Also, a total of 3000 watts of auxiliary
power is available at the 115 or 230VAC receptacles.
The Classic III and Classic IIID models are manufac-
tured with all copper windings.
FIGURE E.1b – CLASSIC IIID BLOCK LOGIC DIAGRAM