THEORY OF OPERATION | ||
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to Section TOC | to Master TOC |
| INPUT LINE VOLTAGE AND MAIN TRANSFORMER | ||||
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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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| TRANSFORMER |
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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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Figure E.2 - Input Line Voltage and Main Transformer.
TOC | TOC | INPUT LINE VOLTAGE AND MAIN | ||
TRANSFORMER | ||||
Section | Master | |||
The desired single phase input power is connected to | ||||
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to | to | the | ||
the front panel. | ||||
Return | Return | |||
A reconnect panel allows the user to configure the | ||||
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| machine for the desired input voltage. This AC input | ||
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| voltage is applied to the primary of the main trans- | ||
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| former and to the thermostatically controlled fan | ||
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| motors. The transformer changes the high voltage, low | ||
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| current input power to a low voltage, high current out- | ||
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| put. In addition, the main transformer also has an iso- | ||
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| lated center tapped 30 VAC auxiliary winding that sup- | ||
TOC |
| plies power to the Control Board for SCR gate drive | ||
TOC | and gas solenoid operation. The weld power windings | |||
connect to the Control Board as well as to the main | ||||
Section | Master | SCR Rectifier. | ||
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| NOTE: Unshaded areas of Block Logic | |
| Diagram are the subject of discussion | |||
Return | Return |
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