Lincoln Electric LF-72/74 service manual Board

Page 110

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G-4	ELECTRICAL DIAGRAMS	G-4
WIRING DIAGRAM - ENTIRE MACHINE - CODE 11290, 11291, 11292,11293 (L12146-2) LF-72

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	CAVITY NUMBERING SEQUENCE					GENERAL INFORMATION
	(COMPONENT SIDE OF P.C. BOARD)					ELECTRICAL SYMBOLS PER E1537
	1	1	2	1	3

	J3	J7		J2		COLOR CODE
	2	3	4	4	6
						B -	BLACK

	1	4		1	8	W -	WHITE
	J5,J8		J1,J14			R -	RED
	J9,J60					U -	BLUE
		8		9	16
	5

552B

552

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

75A	1	75	77			REMOTE
						REMOTE
						CONTROL
				3	10K/2W	CONTROL
76A	2	76	76	2	10K/2W	VOLTAGE
77A	3	77		1		POTENTIOMETER
77A	3	77	75			(OPTIONAL)
			75		N.C.	(OPTIONAL)
	4				N.C.

1	1	L2		INPUT ELECTRODE		P7
B				INPUT ELECTRODE		P7
2	2		67	CABLE CONNECTION	N.B.
				CABLE CONNECTION
A 3	3	551A

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GAS

4

4

FEED

SOLENOID

PLATE

P11

P4

553

TACH

R

POST-FLOW

BURNBACK

U

MOTOR /

J60

TIMER KIT

B

GEARBOX

(OPTIONAL)

1

2

3

4

5

6

7

8

552B

B W

601

515A

605

607

606A

608

BAFFLE

1

521

N.A.

MOUNTED

2

522

RECTIFIER

DIODE

+

3

551B

BRIDGE

551A

P10

N.E.

4

551B

-

P6

1

2

L6

551

41

580 42

3

R

563

L4

562

4

U

575B

5

B

552A

575

L5

6

N.B.

TRIGGER

551

7

B

575B

550

8

W

INPUT

14 PIN

575C

556

A

CIRCULAR

CONNECTOR

554

B

TRIGGER

TO POWER

L1

SOURCE

N.B.

C

CONNECTOR

D

J13

A

E

606A

B

OUTPUT

C

2

1B

CONTROL

D

4

REMOTE

E

77A

L3

606

N.D.

VOLTAGE

F

76A

CONTROL

G

75A

H

THERMAL LED

I

41

42VAC

J

1W

1B

K42

L

	M	67		577		575C			576			4								COLD FEED
SENSE	N	67														2
																2
J12																			558
J12			580		550			A	563	521		587		608	1W K	558 601	589		515A
			580															515	515A	S1
		N.B.																515		S1
		N.B.	562		554	552A 553	556		552	522					E	559	515
NOTES:												605	607		Y		606		559
NOTES:
N.A. CAVITY NUMBERING SEQUENCE AS VIEWED FROMCOMPONENT SIDE																		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		N.C.
			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
OF BOARD.																				TRIGGER
N.B. CAVITY NUMBERING SEQUENCE AS VIEWED FROM LEAD SIDE OF																				TRIGGER
N.B. CAVITY NUMBERING SEQUENCE AS VIEWED FROM LEAD SIDE OF																				INTERLOCK
CONNECTOR.						J1				J2	J3				J14
N.C. TOGGLESWITCHES AND POTENTIOMETERS SHOWN FROM										COMMON ANALOG P.C. BOARD									589	S2
CONNECTION SIDE OF SWITCH.																				S2
CONNECTION SIDE OF SWITCH.																			587
N.D. PIN NEAREST THE FLAT EDGE OF LED LENS ALIGNS WITH WHITE LEAD																			587
																		N.A.
OF LEDSOCKET.																		N.A.		2-STEP
OF LEDSOCKET.																				2-STEP
N.E. P6 NOT USED.																		N.C.		A
																				A
																				L12146-2

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 110

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 Section A-1 Table of ContentsInstallation Section Installation Amp Rating Duty CycleMounting Safety PrecautionLocation Boom Mount Bench MountSwivel Mount SuspendedWeld Cable Sizes Coaxial Weld Cables Weld Cable ConnectionControl Cable Connections INSTALLATIONA-7Analog Control Cable Pin Function Miller Power Source Lincoln Wire FeederAnalog Miller Control Cable Adapter K2335-1 Remote Sense Lead Specifications Wire Drive SystemsWelding GUN/WIRE Feeder Trigger Connector High Frequency ProtectionWelding GUNS, Torches and ACCES- Sories Magnum GUN and Cable AssembliesRolls.FIGURE A.4 Procedure for Changing Drive and Idle Roll SetsWire Drive Configuration Set the pressure arm as follows See Figure A.6 Pressure ARM AdjustmentGun Receiver For use With Bushing Wire Reel Loading Weld Wire Routing Figure A.9Shielding GAS Connection Conduit Kits Installing ElectrodeTo install Lincoln conduit See Figure A.10b 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 ConnectionRecommended Processes Common Welding AbbreviationsProduct Description Front Panel Controls and Connections Figure B.1 Case Front Controls DescriptionStep Trigger Interlock Switch Burnback and Postflow Timer KITCold FEED/GAS Purge Switch Remote Voltage Control KITGUN Receiver Bushing K1500-2 Wire Feed Speed KnobTrigger Connector 5-PIN Amphenol Trigger InterlockAccessories Section Section C-1Accessories Optional KitsLF-72s Accessories Key LF-72/74 Maintenance Section Section D-1Calibration Specification MaintenanceMaintenance Routine MaintenanceFigure D.1 Figure D.3 Major Component Location Section AA-1 Section AAModel WFS Range Wire SizesAA-2 AA-3 Figure AA.1AA-4 AA-5 AA-6 Coaxial Weld CableK1797-xx INSTALLATIONAA-7AA-7 AA-8 Drive Roll Kits Steel or Cored Wires AA-9AA-10 Figure AA.3Lation or changing drive rolls and/or AA-11Changing the Gun Receiver Bushing 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 DescriptionK2426-3 model BB-5K2426-1 and K2426-2 models Switch BB-6Section CC-1 CC-2 CC-3 CC-4 CC-5 CC-6 Section DD-1 Section DDWhen inching with gun trigger, electrode To verify the wire feed speedNal wiring 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