Lincoln Electric SVM153-A service manual Analog Control Power Supply Board and Weld Control Board

Return to Section TOC

Return to Master TOC

E-4 E-4

THEORY OF OPERATION

FIGURE E-4 – ANALOG CONTROL POWER SUPPLY BOARD AND WELD CONTROL BOARD

				THREE-PHASE						WORK
COMMANDER 500									TERMINAL
				RECTIFIER						__
								TO WELD
								CONTROL
								BOARD
				+	(2)	(2)		POWER MODULES
								(2)	ELECTRODE
								IGBT	TERMINAL
					80 VDC
								CHOKE		+
									SHUNT
			W							F
										E
		D	I
										E
	L		N
							(2)	PWM		D
			D
E					ANALOG					B
			I				20 VDC
W			N	POWER SUPPLY				SIGNALS (2)		A
			G							C
					BOARD					K

Return to Section TOC

Return to Master TOC

ENGINE

STARTER

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

			WELD
MECHANICAL	ROTOR	TO	CONTROL
ROTATION		HOLD	BOARD
		IDLE
	SLIP	COIL		VOLTMETER
	RINGS			AMMETER
	STATOR	THERMAL	ARC OUTPUT	PROCESS/RANGE
			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)

PERIPHERAL

BOARD

Return to Section TOC

Return to Master TOC

ANALOG CONTROL POWER SUPPLY BOARD AND WELD CONTROL BOARD

The Analog Power Supply PC board, which is powered by 80 VDC derived from the filter capacitors on the Power Modules, supplies various regulated DC volt- ages to operate the Weld Control PC board circuitry. It also supplies two regulated DC voltages to operate the IGBT driver circuitry on the two Power Modules.

The Weld Control PC board monitors the operator con- trols (arc control, output, and process/range selector). It compares these commands to the current and volt- age feedback information it receives from the shunt

and output terminal circuits. The circuitry on the Weld Control PC board determines how the output should be controlled to optimize welding results, and it sends the correct PWM signals to the IGBT driver circuits. The Weld Control PC board also commands the thermal light and the voltmeter and ammeter (some items may be optional).

Return to Section TOC

Return to Master TOC

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

COMMANDER 500