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THEORY OF OPERATION
FIGURE E.4 – WELD WINDING, OUTPUT BRIDGE, OUTPUT CHOKE AND CV CAPACITORS
SCR/DIODE | OUTPUT | |
OUTPUT | CHOKE | |
BRIDGE | ||
NEGATIVE | ||
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| TERMINAL |
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STARTER
WELD | WINDINGS |
CV | ITORS |
CAPAC |
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CV
TERMINAL
SHUNT
| POSITIVE | |
| TERMINAL | |
| F | |
FEEDBACK | E | |
E | ||
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| D | |
| B | |
| A |
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ALTERNATOR | MECHANICAL |
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ENGINE | ROTOR |
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BOARD
EXCITER VOLTAGE
FEEDBACK
BOARD
CURRENT/ MODE
SELECTOR
SWITCH
12VDC
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WELD WINDING, OUTPUT BRIDGE, OUTPUT CHOKE AND CV CAPACI- TORS
The
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.
1CV Board and CV Capacitors are present on stick and wire model only.
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NOTE: Unshaded areas of Block Logic Diagram are the subject of discussion.
