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OPERATION
FIGURE E.3 – ROTOR FIELD FEEDBACK, AUXILIARY POWER AND ENGINE IDLE CONTROL
| CHOKE |
| POSITIVE |
| OUTPUT |
OUTPUT | TERMINAL |
| |
RECTIFIER |
|
BRIDGE |
|
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|
|
|
| STATOR |
ENGINE | MECHANICAL |
|
|
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| ROTATION |
|
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|
|
| ROTOR | ROTOR | |
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| SLIP |
| |
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| RINGS |
| |
MAGNETO |
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| CAPACITORS |
| STATOR |
IDLER |
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SOLENOID |
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IDLER | + |
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P.C. BOARD |
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| 115 AND 230 VAC | |
RHEOSTAT |
| RECEPTACLES | ||
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| |
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| FIELD |
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| RECTIFIER |
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| BRIDGE |
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| IDLE | HOUR |
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| SWITCH |
| |
|
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| METER |
|
NEGATIVE OUTPUT TERMINAL
CURRENT
TRANSFORMER
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ROTOR FIELD FEEDBACK,
AUXILIARY POWER AND
ENGINE IDLE CONTROL
The AC voltage developed in the field winding is fed to the full wave rectifier bridge. The DC output of the bridge is filtered by the field capacitor and controlled by the output rheostat. This filtered and controlled feedback voltage is fed to the rotor winding via the brush and slip ring configuration. As the feedback voltage is increased or decreased, the outputs of the weld and auxiliary windings are likewise increased or decreased.
The hour meter is also powered by the field rectifier bridge. When field voltage is present, the hour meter will run.
When full field voltage is applied to the rotor and the engine is running at high speed (3700 RPM), a 230VAC voltage is developed in the stator auxiliary winding. This winding is tapped. Each half of this winding pro- vides 115 VAC to each side of the 115V duplex recep- tacle. The two voltages (115VAC and 230VAC) are
connected to the appropriate receptacles and offer 4500 watts (total) of AC power.
The idler solenoid is mechanically connected to the engine throttle linkage. The field winding provides power for the idler P.C. board and also to the idler solenoid, which brings the engine to a low idle state. When output current, either weld or auxiliary, is sensed by the current transformer, the P.C. board deactivates the idler solenoid, and the engine returns to high RPM.
AUXILIARY POWER OVERCURRENT PROTECTION
The 4500 watt auxiliary power winding and circuitry is protected from an overload condition by two 20 amp circuit breakers. The circuit breakers are located below the output receptacles. They can be manually reset.
NOTE: Unshaded areas of Block Logic Diagram are the subject of discussion.
WELDANPOWER 125
