Lincoln Electric SVM197-A service manual Theory of Operation, Engine Control and Ignition

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E-2	THEORY OF OPERATION	E-2
	FIGURE E.2 – ENGINE CONTROL, IGNITION, ROTOR & STATOR

		REACTOR
			OUTPUT
			TERMINALS
		STATOR
ENGINE	MECHANICAL
	ROTATION
	ROTOR	ROTOR
	SLIP
MAGNETO	RINGS
CIRCUIT		STATOR
	CAPACITOR
LOW OIL
SWITCH		CIRCUIT	CIRCUIT
		BREAKER	BREAKER
RUN/STOP
	SWITCH
	RHEOSTAT	BRIDGE
		230VAC	115VAC
		RECEPTACLES	RECEPTACLES

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ENGINE CONTROL AND IGNITION

The engine ignition is created and controlled by a fly- wheel type magneto circuit. This circuit is shorted to ground when the ON/OFF switch is moved to the OFF position, thus disabling the ignition circuit and shutting down the engine. In the event of a low oil level condi- tion the Low Oil Level Switch will activate and short the ignition circuit to ground. This will disable the igni- tion circuit and shut down the engine. This is a pro- tective function to prevent damage to the engine if the crankcase oil level is inadequate.

ENGINE, EXCITATION, ROTOR AND STATOR

A small voltage developed by the engine magneto is fed through a diode to the rotating field coil in the rotor via a brush and slip ring configuration. This excitation (“flashing”) voltage magnetizes the rotor lamination. The rotor is mechanically coupled to the engine. The rotating magnet induces a voltage in the stationary windings of the main alternator (stator).

Three separate and isolated windings are incorporated in the stator lamination assembly. Each winding set has a different number of turns, producing different magnitudes of AC output voltages. The three windings are the weld winding, the auxiliary power winding and the field feedback winding. The field feedback wind- ing provides rotor current during machine operation. The output of the POWERARC® 5500 is dependent on two criteria: the engine RPM and the amount of current in the rotor winding.

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NOTE: Unshaded areas of Block Logic Diagram are the subject of discussion

POWERARC® 5500