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

J5,J8		J1,J14
J9,J60		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
			75A	1	75									REMOTE
			76A	2	76							3	10K/2W	CONTROL
											76	2	10K/2W	VOLTAGE
											76	2		VOLTAGE
				3	77							1		POTENTIOMETER
			77A											POTENTIOMETER
			77A								75			(OPTIONAL)
			INPUT ELECTRODE								75		N.C.	(OPTIONAL)
			INPUT ELECTRODE	4									N.C.
	L2	67	CABLE CONNECTION	P7
	L2		CABLE CONNECTION
			N.B.
			N.B.
			FEED
			PLATE
		TACH			POST-FLOW							BURNBACK		TIMER KIT
		R						J60						TIMER KIT
		R												(OPTIONAL)
			MOTOR /											(OPTIONAL)
		U	MOTOR /
	1	B	GEARBOX
	2	B
	2				1	2	3	4	5	6	7	8
563	3				1	2	3	4	5	6	7	8
563	3
562	4				601		515A		605		607
575B	5		B W							606A 608
575B	5

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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																											N.A.
											550	8			W
												P5
														N.B.																					P9										TRIGGER
																																			P9

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

Image 108

Contents LF-72/74 Safety Electric Shock can kill Welding Sparks can cause fire or explosion IiiPrécautions DE Sûreté Sûreté Pour Soudage a L’ArcMaster Table of Contents for ALL Sections Table of Contents Installation SectionSection A-1 Installation Amp Rating Duty CycleSafety Precaution LocationMounting Bench Mount Swivel MountBoom Mount SuspendedWeld Cable Sizes Coaxial Weld Cables Weld Cable ConnectionINSTALLATIONA-7 Analog Control CableControl Cable Connections Miller Power Source Lincoln Wire Feeder Analog Miller Control Cable Adapter K2335-1Pin Function Wire Drive Systems Welding GUN/WIRE Feeder Trigger ConnectorRemote Sense Lead Specifications High Frequency ProtectionWelding GUNS, Torches and ACCES- Sories Magnum GUN and Cable AssembliesProcedure for Changing Drive and Idle Roll Sets Wire Drive ConfigurationRolls.FIGURE A.4 Pressure ARM Adjustment Gun Receiver For use With BushingSet the pressure arm as follows See Figure A.6 Wire Reel Loading Weld Wire Routing Figure A.9Shielding GAS Connection Installing Electrode To install Lincoln conduit See Figure A.10bConduit Kits For Codes 11209, 11210, 11211 and aboveAluminum Wire Preparations Figure A.12bINSTALLATIONA-18 Base Model Bench Model Standard Duty Bench Model Heavy DutyTypical System Configurations CableLF-72/74 Operation Section Section B-1Operation GAS Input Work ConnectionCommon Welding Abbreviations Product DescriptionRecommended Processes Front Panel Controls and Connections Figure B.1 Case Front Controls DescriptionBurnback and Postflow Timer KIT Cold FEED/GAS Purge SwitchStep Trigger Interlock Switch Remote Voltage Control KITWire Feed Speed Knob Trigger Connector 5-PIN AmphenolGUN Receiver Bushing K1500-2 Trigger InterlockAccessories Section Section C-1Accessories Optional KitsLF-72s Accessories Key LF-72/74 Maintenance Section Section D-1Maintenance MaintenanceCalibration Specification Routine MaintenanceFigure D.1 Figure D.3 Major Component Location Section AA-1 Section AAWFS Range Wire Sizes AA-2Model AA-3 Figure AA.1AA-4 AA-5 AA-6 Coaxial Weld CableINSTALLATIONAA-7 AA-7K1797-xx AA-8 Drive Roll Kits Steel or Cored Wires AA-9AA-10 Figure AA.3AA-11 Changing the Gun Receiver BushingLation or changing drive rolls and/or GuidesAssembly of Drive Rolls and Wire Guides AA-12AA-13 Set the pressure arm as follows See Figure AA.8AA-14 AA-15 Loading 16 to 44 lb .3 20kg Spools See figure AA.8AA-16 Figure AA.11AA-17 Figure AA.12aAA-18 Figure AA.12bAA-19 AA-20INSTALLATIONAA-20 Common Equipment SET-UPSFigure AA.15 High Volume Production AA-21Figure AA.16 Portable Welding AA-22Section BB-1 Section BBBB-2 Fcaw Innershield or OutershieldRequired Equipment BB-3BB-4 Figure BB.1 Case Front Controls DescriptionBB-5 K2426-1 and K2426-2 modelsK2426-3 model Switch BB-6Section CC-1 CC-2 CC-3 CC-4 CC-5 CC-6 Section DD-1 Section DDTo verify the wire feed speed Nal wiringWhen inching with gun trigger, electrode WFS knob setting Could remain energized Several secondsMAINTENANCEDD-3 DD-3Figure DD.3 Major Component Location DD-4Theory of Operation Section Section E-1Theory of Operation Return to SectionControl Board LF-72/74 Troubleshooting & Repair Section Section F-1Troubleshooting & Repair HOW to USE Troubleshooting GuidePC Board Troubleshooting Procedures Function Problems Function Problems Troubleshooting & Repair Drive Motor and Tach Feedback Test Test DescriptionTest Procedure Troubleshooting and Repair GAS Solenoid TestTest Procedure Figure F.3 Leads 552, 552BDiode Bridge Test 552B + 552A Wire Speed Potentiometer Test Wire Speed Potentiometer Test 14F-14PC Board Removal and Replacement Control PC Board Removal and Replacement Procedure Removal Procedure Replacement ProcedureTroubleshooting and Repair Wire Drive Motor and Gear BOX Removal and Replacement ProcedureProcedure Replacement Procedures SET UP Operation VerificationLF-72/74 Electrical Diagrams Section Section G-1Electrical Diagrams LF-72/74Timer KIT Board Normal Speed Micro Internal panel Motor Connecter Summary High Torque Setting engages Schematic Common Analog Control PC Board G4559 Sheet Electrical Diagrams Electrical Diagrams PC Board Assembly Common Analog Control G4560-2E0