Lincoln Electric SVM 122-A service manual Table of Contents Theory of Operation Section

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Section E-1Section E-1

TABLE OF CONTENTS

-THEORY OF OPERATION SECTION-

Theory of Operation	Section E
General Description	E-2
Input Line Voltage, Contactor and Main Transformer	E-2
Output Mode and Control, Rectification and Feedback	E-3
Protective Devices and Circuits	E-4
SCR Operation	E-5

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CONTROL

TRANSFORMER

POWER
SWITCH			MAIN
		TRANSFORMER
		R
		E
		C
		O
		N
		N
		E
		C
		T
INPUT
CONTACTOR
		T	115VAC
	REMOTE	E	S
TO	CONTROL	R	T
CONTROL		M	R
BOARD		I	I
		N
			P
		A
		L
			FAN
			42VAC
		14 PIN
		AMPHENOL

OUTPUT	ARC FORCE
CONTROL	CONTROL
	PART OF
	MODE
	SWITCH
			FEEDBACK
CONTROL BOARD				NEGATIVE
				OUTPUT
G	S		PART	TERMINAL
A	I		OF
T	G		MODE
			SWITCH
E	N
	A
	L
	S			OUTPUT
				CHOKE
		F
	PART	E
	OF	E
	MODE	D
	SWITCH	B	START
		A
			BOARD
		C
	OUTPUT	K
	CAPACITORS
				POSITIVE
				OUTPUT
				TERMINAL
SCR / DIODE		SHUNT	REED
			SWITCH
HYBRID BRIDGE

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FIGURE E.1 – IDEALARC DC-400 BLOCK LOGIC DIAGRAM

IDEALARC DC-400

LINCOLN ®

ELECTRIC