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THEORY OF OPERATION |
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FIGURE E.4 – OPTIONAL CIRCUITS.
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| WIRE |
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| GAS |
| SPEED |
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| SOLENOID |
| CONTROL |
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| WIRE |
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| DRIVE |
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| MOTOR |
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| CONTROL BOARD |
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FAN | RECTIFIER |
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MOTOR | DIODE |
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| TRANSFORMER | OUTPUT BRIDGE |
| BRIDGE |
| TACH | ||
| 28VAC | CONTACTOR CONTROL | FEEDBACK | THERMOSTAT | THERMOSTAT |
LINE | GUN TRIGGER |
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SWITCH | TAP SELECTOR |
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SWITCH |
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| OUTPUT DIODE |
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| BRIDGE |
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| + | + |
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| OUTPUT | POSITIVE | |
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| CHOKE | ||
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| TERMINAL | ||
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| CONTACTOR | OUTPUT |
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| CAPACITORS |
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RECONNECT |
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| - | - |
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MAIN |
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| NEGATIVE | ||
PANEL | TRANSFORMER |
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| TERMINAL | |||
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GUN
ASSEMBLY
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CONTROL BOARD, GUN
TRIGGER AND WIRE DRIVE
MOTOR
When the control board receives an activation command from the trigger circuit the control board activates the gas solenoid, output contactor, and the wire drive motor. The control board monitors the motor’s tach feedback signals and compares these to the wire speed control setting. The proper armature voltage is then applied to the wire drive motor. The drive motor speed is thus controlled which in turn regulates the electrode wire feed speed through the gun.
Two thermostats are included in the trigger circuitry. If either of these thermostats would “open”, the trigger circuit would be interrupted and the machine’s output would be disabled.
NOTE: Unshaded areas of block logic diagrams are the subject of discussion.