Lincoln Electric SVM153-A service manual Commander, 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
Battery, Starter, Engine, Rotor, Stator, Pull Coil Board and Peripheral
Board – Engine Protection	E-2
Weld Windings, Rectifier, Power Modules and Feedback	E-3
Analog Power Supply Board and Weld Control Board	E-4
Insulated Gate Bipolar Transistor (IGBT) Operation	E-5
Pulse Width Modulation	E-6
Chopper Technology Fundamentals	E-7

FIGURE E.1 – MULTI-WELD 500 BLOCK LOGIC DIAGRAM

COMMANDER 500

THREE-PHASE

RECTIFIER

(2)(2)

+

WORK

TERMINAL

__

TO WELD

CONTROL

BOARD

POWER MODULES

(2)ELECTRODE TERMINAL

IGBT

				80 VDC		CHOKE		+
							SHUNT
			W					F
								E
		D	I
								E
	L		N
					(2)	PWM		D
			D
E				ANALOG	20 VDC			B
			I			SIGNALS (2)		A
W			N	POWER SUPPLY
			G					C
				BOARD				K

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ENGINE

STARTER

ALTERNATOR
RUN/STOP
SWITCH							ENGINE
		BATTERY			S		SENSORS
					H
		BOARD			U	I		1/2
					T
						D		BATTERY
					D
					O	L		BD
120				10	W	E
	VDC			VDC	N	R
BATTERY						SOL
		PULL
		COIL				TO WELD
		BOARD			SOL	CONTROL
						BOARD
			10
			VDC

PERIPHERAL

BOARD

			WELD
MECHANICAL	ROTOR	TO	CONTROL
ROTATION		HOLD	BOARD
		IDLE
	SLIP	COIL		VOLTMETER
	RINGS			AMMETER
		THERMAL	ARC OUTPUT	PROCESS/RANGE
	STATOR		CONTROL CONTROL SELECTOR
		LIGHT
		42 VAC TO 14 PIN AMPHENOL
	AUXILIARY WINDINGS	FOR WIRE FEEDER
	1
	2
	0	240VAC
	V	RECEPTACLE

A

C

120VAC RECEPTACLES (2)

COMMANDER 500