Lincoln Electric SVM128-A service manual Table of Contents Theory of Operation Section

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Section E-1 Section E-1

TABLE OF CONTENTS

-THEORY OF OPERATION SECTION-

Theory of Operation	Section E
General Description	E-2
Battery, Starter, Engine Alternator, and Protection Circuits	E-2
Engine, Generator Armature and Frame, Alternator Stator and Rotor	E-3
Excitation (Flashing)	E-3
Auxiliary and Field Feedback Coils	E-3
Interpole and Series Coils	E-4
Current Range Selector	E-4
Fine Current Adjustment	E-4
Engine Idler Circuit	E-4
DC Generator Machines	E-5

	PROTECTION					SELECTOR
		RELAY
						SWITCH
								REED
		IDLER						RELAY		NEGATIVE
		BOARD						CR2
										OUTPUT
										TERMINAL
								115 & 230VAC
								RECEPTACLES
			IDLER
		SOLENOID
		OIL			GENERATOR
	TEMPERATURE	PRESSURE				FRAME
	GAUGE	SWITCH							CURRENT
	FUEL			SERIES
	INJECTION			COILS					TRANSFORMER
	PUMP
						BRUSHES & COMMUTATOR		ALTERNATOR	STATOR
SWITCH	ENGINE			ARMATURE					SLIP
		ENGINE	MECHANICAL	GENERATOR			ARMATURE	ROTOR
IGNITION			COUPLING				SHAFT
	ALTERNATOR								RINGS
				INTERPOLE
				COILS	RESIDUAL
		STARTER			MAGNETISM		FLASHING
		MOTOR			FIELD
					SHUNT
				WINDINGS
								FIELD
	BATTERY							RECTIFIER
						GENERATOR
						FIELD CONTROL

POSITIVE

OUTPUT

TERMINAL

FIGURE E.1 – SA-250 BLOCK LOGIC DIAGRAM

SA-250