Lincoln Electric LF-72/74 service manual Electrical Diagrams

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G-2	ELECTRICAL DIAGRAMS	G-2
WIRING DIAGRAM - ENTIRE MACHINE - CODE 11075, 11076, 11077 (L12146) LF-72

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CAVITY NUMBERING SEQUENCE

(COMPONENT SIDE OF P.C. BOARD)

1		1	2	1	3
J3	J7			J2
2		3	4	4	6
1	4		1		8

GENERAL INFORMATION

ELECTRICAL SYMBOLS PER E1537

COLOR CODE
B -	BLACK
W -	WHITE
R -	RED
U -	BLUE

575	1	575A	577A			WIRE FEED
576	2	576A		3
						SPEED
			576A	2	10K/2W
577	3	577A
				1		CONTROL
	4
			575A			POTENTIOMETER
	5				N.C.
	6

J5,J8		J1,J14
J9,J60
5	8	9	16

N.B.

P8

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552B

552

GAS

SOLENOID

553

41A BAFFLE

552B

			75A	1	75						77			REMOTE
			76A	2	76							3	10K/2W	CONTROL
											76	2		VOLTAGE
				3	77							1		POTENTIOMETER
			77A
											75			(OPTIONAL)
			INPUT ELECTRODE										N.C.
				4
	L2	67	CABLE CONNECTION	P7
			N.B.
			FEED
			PLATE
		TACH			POST-FLOW							BURNBACK		TIMER KIT
		R						J60
														(OPTIONAL)
			MOTOR /
		U
	1	B	GEARBOX
	2
					1	2	3	4	5	6	7	8
563	3
562	4				601		515A		605		607
575B	5		B W							606A 608

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MOUNTED

RECTIFIER

DIODE

BRIDGE

552A

+ 552C

	-
41	580	42

14PIN

AMPHENOL

CONNECTOR

TO POWERL1

SOURCE

			A
			B
		OUTPUT	C		2
	CONTROL		D		4
	REMOTE		E		77A
	VOLTAGE		F		76A
	CONTROL		G		75A
			H
42VAC		ARC	I		41
			J		50
		CURRENT	K		42
ARC VOLTAGE			L		51
			M
		SENSE	N	67

J6

N.B.

												6																																N.A.
											551	7					B
											550	8			W
												P5
														N.B.																					P9										TRIGGER
								L4			L5																																		INPUT
																																											556	A
																															1	2	3	4	5	6	7	8	9	10
																																												B
																																											554		TRIGGER
		575
																																												C
				575B																											50		41A			51				552C					CONNECTOR
																																												D
																																													J4
				575C
																																												E
																																									606A		N.B.
																																										B
																																								L3	606	N.D.
																																												THERMAL LED
																																											W		B
																																											COLD FEED
																																											558
	580																			4								2															515A		S1
		577						575C		576																																	515
			550							551	563	COMMON ANALOG P.C. BOARD									587			608			K		558	601	589												559
562		554			552A 553					556	552																		559		515
																											E
																					605	607				W	Y				606											N.C.	GAS PURGE
1	2	3	4	5	6	7	8	9	10 11 12 13 14 15 16			1	2	3	4	5	6	1	2	1	2	3	4	5	6	7	8	9	10 11 12 13 14 15 16
																																											TRIGGER
																																											INTERLOCK
							J1							J2				J3									J14
																																											589		S2

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NOTES:

N.A. CAVITY NUMBERING SEQUENCE AS VIEWED FROMCOMPONENT SIDE OF BOARD. N.B. CAVITY NUMBERING SEQUENCE AS VIEWED FROM LEAD SIDE OF CONNECTOR.

N.C. TOGGLESWITCHES AND POTENTIOMETERS SHOWN FROMCONNECTION SIDE OF SWITCH. N.D. PIN NEAREST THE FLAT EDGE OF LED LENS ALIGNS WITH WHITE LEAD OF LED SOCKET.

587

2-STEP

N.C.

N.A.

A

L12146

NOTE: This diagram is for reference only. It may not be accurate for all machines covered by this manual. The wiring diagram specific to your code is pasted inside one of the enclosure panels of your machine.

LF-72/74