Lincoln Electric SVM151-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 -
General Description	E-2
Input Power Source, Contactor and DC Buss Power Supply Board	E-2
Power Modules and Feedback	E-3
Analog Control Power Supply Board and Weld Control Board	E-4
Mode Selector and Output Controls	E-5
Protection Features	E-6
Insulated Gate Bipolar Transistor (IGBT) Operation	E-7
Pulse Width Modulation	E-8
Chopper Technology Fundamentals	E-9

MULTI-WELD 350 BLOCK LOGIC DIAGRAM

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+

DC

POWER SOURCE

(EXTERNAL)

_

INPUT			LEFT AND RIGHT
DIODES	INPUT		CHOPPER MODULES
	CONTACTOR
		CR1
			IGBT		FREEWHEELING DIODE
			CHOPPER MODULE
		INPUT			CHOKE
	CAPACITORS
	ON/OFF		IGBT		FREEWHEELING DIODE
	MODE
	SWITCH	20	CHOPPER MODULE
	(1/2)
		VDC		ON/OFF	VOLTS AMPS
		x 2		MODE
				SWITCH
				(1/2)
				GATE
			ANALOG	SIGNALS
	DC	40			WELD
	BUS	VDC	CONTROL VOLTAGES		CONTROL
				REGULATED
	POWER		POWER	FAN	BOARD
	SUPPLY		SUPPLY
	BOARD		BOARD

TO ELECTRODE

CABLE

SHUNT+

CURRENT FEEDBACK

TO WELD CONTROL BOARD

REMOTE

RECEPTACLE

CCSLOPE

(STICK/GOUGE or PIPE)

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40 VDC	ARC OUTPUT		HOT
15 VDC				THERMAL
	FORCE	CONTROL	START	LIGHT
	CONTROL
	CR1
	COIL
PERIPHERAL
BOARD	INDICATOR
	INPUT
	LIGHT

-

WORK

FIGURE E.1 – MULTI-WELD 350 BLOCK LOGIC DIAGRAM

MULTI-WELD 350