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THEORY OF OPERATION |
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FIGURE E.2 – BATTERY, STARTER, ENGINE, ROTOR, STATOR AND ENGINE PROTECTION | ||
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CONTROL |
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BOARD |
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SHUNT | __ | |
RECTIFIER |
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| ENGINE | ROTATION | ROTOR | BOARD | |||
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STARTER |
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| ARC OUTPUT MODE |
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ALTERNATOR | ENGINE |
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| AUXILIARY | WINDINGS |
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BATTERY | SOL | D |
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| RECEPTACLE | 42VAC |
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| PROTECTION |
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| 30VAC |
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| CONTROL |
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| TRANSFORMER | 30VAC |
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GENERAL DESCRIPTION
The Commander 300 is a diesel
BATTERY, ENGINE, ROTOR, STA- TOR AND ENGINE PROTECTION
The 12VDC battery powers the engine starter motor and also supplies power to the engine alternator and engine protection board. When the engine is started and running, the battery circuit voltage is fed through the protection board to the rotor field coil via a brush and slip ring configuration. This excitation or “flashing”
voltage magnetizes the rotor lamination. The rotor is mechanically coupled to the engine. This rotating mag- net induces a voltage in the stationary windings of the main alternator stator. The stator houses a three- phase weld winding and also a 115/230VAC single- phase auxiliary winding. The 115VAC portion of the auxiliary winding is also rectified and serves as a feed- back supply for the rotor field winding.
The engine alternator supplies charging current for the battery circuit. The engine protection board monitors the sensors and will shut the engine off in the event of low oil pressure, engine over temperature, malfunction in the engines alternator system or a low fuel condition. The idler solenoid is mechanically connected to the engines throttle linkage. If no welding or auxiliary cur- rent is being drawn from the Commander 300, the pro- tection board activates the idler solenoid, which then brings the engine to a low idle state. When output cur- rent is sensed, either weld or auxiliary, the protection board deactivates the idler solenoid and the engine returns to high RPM.
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NOTE: Unshaded areas of Block Logic Diagram are the subject of discussion.
