THEORY OF OPERATION
E-4 E-4
COMMANDER 400
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WELD WINDING, OUTPUT BRIDGE,
OUTPUT CHOKE AND CV CAPACI-
TORS
The three-phase AC output that is created in the stator
weld winding is connected to the SCR/Diode output
bridge where it is rectified and controlled. See SCR
Operation.
A choke is connected between the negative side of the
bridge and the negative output terminal. This large
inductor stores energy and provides filtering for the
welding output of the Commander 400.
In the constant voltage (CV) mode, the CV capacitors
are brought into the welding circuit via an SCR that is
activated by the CV board. These capacitors add volt-
age filtering and help maintain a constant arc voltage at
the output terminals.
1
The shunt, which is in series with the positive output
terminal, provides current feedback to the control
board.
1
CV Board and CV Capacitors are present on stick and wire
model only.
NOTE: Unshaded areas of Block Logic Diagram are the subject of discussion.
FIGURE E.4 – WELD WINDING, OUTPUT BRIDGE, OUTPUT CHOKE AND CV CAPACITORS
