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| THEORY OF OPERATION | ||||
Return to Section TOC | Return to Master TOC |
| FIGURE E.3 - Output Rectification, Control and Feedback |
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Return to Section TOC | Return to Master TOC |
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Section TOC | Master TOC | OUTPUT RECTIFICATION, |
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to | to |
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CONTROL AND FEEDBACK |
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Return | Return |
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The AC output from the main transformer sec- | into an isolated drive signal. This isolated signal | ||||||||
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| ondary is rectified through the SCR/ DIODE | drives the transistor module to the optimum level | ||||||
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| bridge. The machine output is controlled through | to obtain the desired machine output current. The | ||||||
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| the | transistor module. | The | output current is | control and power board also generate the gate | |||
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| sensed at the shunt, as a low voltage signal, and | firing pulses for the SCR/DIODE bridge. The rec- | ||||||
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| fed back to the control board. | The control board | tified and controlled DC voltage is filtered by the | |||||
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| compares the commands of the output control | output capacitors and choke and is applied to the | ||||||
TOC | TOC | potentiometer with the shunt feedback signal and | machine's torch and work terminals. The control | ||||||
the appropriate pulse width modulated (PWM) | board also operates the status board and com- | ||||||||
control signal is sent to the power board. | The | mands the pilot arc circuitry. |
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to Section | to Master |
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power board converts the PWM control signal |
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| NOTE: Unshaded areas of Block Logic |
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Return | Return |
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| Diagram are the subject of discussion |
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