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THEORY OF OPERATION
FIGURE E.6 – CONTROL AND DISPLAY BOARDS
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INPUT |
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SWITCH | RECTIFIER |
| AIR |
| PRESSURE |
| SWITCH |
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POWER BOARD
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| IGBT |
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C |
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I |
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| IGBT |
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T |
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MAIN
TRANSFORMER
TRIGGER & SAFETY
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| NOZZLE | |
| ELECTRODE |
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| TORCH | |
OUTPUT | BOARD | CONNECTOR | |
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| CHOKE | S | |
| PILOT | O | |
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TRANSISTOR | |||
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Return to
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N | SIGNAL |
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| CONTROL BOARD |
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| 18/36VAC |
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| R | A | T | S |
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| E | I | H | A |
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| THERMOSTATS |
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| Y | O | A | Y |
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| W | L |
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OUTPUT CONTROL
DISPLAY BOARD
ELECTRODE & TRANSFER
CURRENT FEEDBACK
PILOT ENABLE
ELECTRODE SOLENOID ENABLE
AIR SOLENOID ENABLE
12VAC
24VAC
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115VAC
AUXILIARY
TRANSFORMER FAN MOTOR
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CONTROL AND DISPLAY BOARDS
The control board receives status and analog feed- back signals from the output board, display board, power board and various sensors. The processor interprets these signals, makes decisions and changes machine mode and output to satisfy the requirements as defined by the internal software. The control board
regulates the output of the machine by controlling the IGBT switching times through pulse width modulation circuitry. See Pulse Width Modulation in this section.
The display board receives commands from the con- trol board and, via indicator lights, communicates
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