Lincoln Electric V155-S service manual 1TABLE of CONTENTS-THEORY of Operation Section E-1

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E-1TABLE OF CONTENTS-THEORY OF OPERATION SECTION E-1

Theory of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .E-1

General Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .E-2

Input Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .E-3

Main IGBT Inverter Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .E-4

Main Transformer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .E-4

Control Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .E-5

Insulated Gate Bipolar Transistor (IGBT) Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .E-6

Pulse Width Modulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .E-7

FIGURE E.1 — BLOCK LOGIC DIAGRAM.

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							BLUE
ON/OFF SWITCH			5	2		WHITE
			4	1	WHITE
	L	WIRE TIE			BLUE		PWR1 PWR2 PWR4 PW
					BLACK	AC1
	N				WHITE	AC2		INPUT BOARD
	G
115/230Vac						PE		W05X0701
								(SCHEMATIC: X0701)
50/60 Hz
								RECONNECT
								BOARD
				WHITE	BLUE			W05X0408
		FAN						(SCHEMATIC: X0408)
					RED	JP4
TWISTED CABLE					BLACK
RIBBON CABLE

PCB CONNECTOR CAVITY NUMBERING SEQUENCE
(VIEWED FROM COMPONENT SIDE OF P.C. BOARD)
1	4	2	16

4 PINS 1 16 PINS 15

			RED		DC+
			BLACK		DC-
R3	DC+	RED
		BLACK		Y/G	PE
	DC-		JP1
JP1					JP1	INVERTER BOARD
						W05X0519
						(SCHEMATIC: X0519)
						P1		+
								-
						N1	SHUNT
		CONTROL BOARD					BLACK	RED
		W05X0708-1						WHITE
		(SCHEMATIC: X0708)		RED
		PE
			JP2	BLACK
				WHITE

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INVERTEC® V155-S