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THEORY OF OPERATION | ||
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to Section TOC | to Master TOC |
| OUTPUT RECTIFICATION AND FEEDBACK | ||||
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Return | Return |
| WIRE | GAS |
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| SPEED | SOLENOID |
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| WIRE | ||
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| DRIVE |
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| ARC |
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| MOTOR |
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| VOLTAGE |
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| CONTROL BOARD |
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| TACH |
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| GUN TRIGGER AND THUMB SWITCH | |
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| LINE | MAIN | E |
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| TRANSFORMER |
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| SWITCH | I |
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| FEEDBACK | |
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TOC |
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TOC |
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| RECONNECT |
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| POSITIVE | ||
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Section | Master |
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| TERMINAL | ||
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| CHOKE | ||
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to | to |
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| C | D |
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| SCR | I | B |
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Return | Return |
| RECTIFIER | T | A |
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| O | C |
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| FAN |
| R | K | NEGATIVE | ||
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| MOTORS |
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| TERMINAL | |||
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| SHUNT |
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Figure E.3 - Output Rectification and Feedback.
TOC | TOC | OUTPUT RECTIFICATION AND | ||
Section | Master | |||
FEEDBACK CONTROL | ||||
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to | to | The AC output from the main transformer secondary | ||
weld winding is rectified and controlled through the | ||||
Return | Return | |||
SCR rectifier assembly. Output voltage and current | ||||
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| are sensed at the shunt and output terminals and are | ||
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| fed back to the control board. The control board com- | ||
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| pares the commands of the ARC Voltage Control | ||
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| potentiometer with the feedback signals. The appro- | ||
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| priate gate firing pulses are generated by the control | ||
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| board and applied to the SCR rectifier assembly. The | ||
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| control board controls the firing of the SCRs, thus con- | ||
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| trolling the output of the machine. See SCR | ||
Section TOC | Master TOC | Operation. The control board also powers and com- | ||
mands the gas solenoid and the wire drive motor. | ||||
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to | to |
| NOTE: Unshaded areas of Block Logic | |
| Diagram are the subject of discussion | |||
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