Return to Section TOC
Return to Section TOC
Return to Master TOC
Return to Master TOC
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| THEORY OF OPERATION |
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| FIGURE E.4 — FEEDBACK & CONTROL CIRCUITS |
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| ELECTRODE |
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| 67 |
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| INPUT |
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| INPUT |
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| CONTACTOR CURRENT TRANSDUCER |
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| FEEDPLATE |
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| SOLENOID |
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| POLARITY |
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| TIMER OPTION |
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| V M |
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| MOTOR | TACH |
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| GUN |
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| MOTOR |
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| OVERLOAD |
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| ARMATURE |
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| CONTROL |
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| BOARD |
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| TACH FEEDBACK |
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| GUN TRIGGER |
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| REMOTE |
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| WIRE |
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| 14 PIN AMPHENOL |
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| SPEED |
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| COLD |
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| TRIGGER |
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| DIGITAL |
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| RUN IN |
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| BOARD |
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Return to Section TOC
Return to Master TOC
FEEDBACK AND CONTROL CIR- CUITS
The wire speed pot provides command signal to the control board indicating the desired wire speed. The tachometer transforms the motor RPM to a digital fre- quency that is fed back to the control board.
When operating in constant voltage (CV) mode, the control board monitors the feedback signal, compares it to the command signal and delivers the appropriate voltage to the wire drive motor.
When operating in constant current (CC) mode, a vari- able wire speed is desirable to compensate for the varying arc voltages associated with the constant cur- rent process. To accomplish this, the control board monitors the command voltage, the feedback signal from the tach and the arc voltage.
These three factors are monitored and compared, then the appropriate armature voltage is applied to the wire drive motor.
When the
Pressing the cold feed button activates the drive rolls but neither the power source nor the gas solenoid will be activated.
Return to Section TOC
Return to Master TOC
NOTE: Unshaded areas of Block Logic Diagram are the subject of discussion
