Lincoln Electric LF-72/74 service manual Timer KIT

Page 109

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G-3	ELECTRICAL DIAGRAMS	G-3
WIRING DIAGRAM - ENTIRE MACHINE - CODE 11209, 11210, 11211,11227 (L12146-1) 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

552B

BAFFLE

MOUNTED

RECTIFIER

DIODE

BRIDGE

+	552A

	-
41	580	42

14PIN

AMPHENOL

CONNECTOR

TO POWERL1

SOURCE

	A
	A
	B
OUTPUT	C			2
CONTROL	D			4
REMOTE	E			77A
VOLTAGE	F			76A
CONTROL	G			75A
	G			75A
	H
42VAC	I			41
	I			41
	J
	J

K42

L

M

SENSE

N

67

J6

N.B.

																															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)
													L2										INPUT ELECTRODE									4										N.C.
													L2						67				CABLE CONNECTION									P7
																															N.B.	P7
																															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
												6																																N.A.
											551	7					B																											N.A.
											551	7					B
											550	8			W
												P5
														N.B.																														TRIGGER
																																												TRIGGER
								L4			L5																																	INPUT
								L4			L5																															556		A
																																										556		A
		575																																								554		B		TRIGGER
		575																																								554				TRIGGER
				575B																																								C	CONNECTOR
																																												D	CONNECTOR
																																														J4
				575C
				575C																																								E
																																												E
																																							606A			N.B.
																																										N.B.
																																								B		N.D.
																																	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

L12146-1

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 109

Contents LF-72/74 Safety Electric Shock can kill Iii Welding Sparks can cause fire or explosionSûreté Pour Soudage a L’Arc Précautions DE SûretéMaster Table of Contents for ALL Sections Installation Section Table of ContentsSection A-1 Amp Rating Duty Cycle InstallationLocation Safety PrecautionMounting Swivel Mount Bench MountBoom Mount SuspendedWeld Cable Sizes Weld Cable Connection Coaxial Weld CablesAnalog Control Cable INSTALLATIONA-7Control Cable Connections Analog Miller Control Cable Adapter K2335-1 Miller Power Source Lincoln Wire FeederPin Function Welding GUN/WIRE Feeder Trigger Connector Wire Drive SystemsRemote Sense Lead Specifications High Frequency ProtectionMagnum GUN and Cable Assemblies Welding GUNS, Torches and ACCES- SoriesWire Drive Configuration Procedure for Changing Drive and Idle Roll SetsRolls.FIGURE A.4 Gun Receiver For use With Bushing Pressure ARM AdjustmentSet the pressure arm as follows See Figure A.6 Wire Reel Loading Figure A.9 Weld Wire RoutingShielding GAS Connection To install Lincoln conduit See Figure A.10b Installing ElectrodeConduit Kits For Codes 11209, 11210, 11211 and aboveFigure A.12b Aluminum Wire PreparationsBase Model Bench Model Standard Duty Bench Model Heavy Duty INSTALLATIONA-18Cable Typical System ConfigurationsLF-72/74 Section B-1 Operation SectionGAS Input Work Connection OperationProduct Description Common Welding AbbreviationsRecommended Processes Figure B.1 Case Front Controls Description Front Panel Controls and ConnectionsCold FEED/GAS Purge Switch Burnback and Postflow Timer KITStep Trigger Interlock Switch Remote Voltage Control KITTrigger Connector 5-PIN Amphenol Wire Feed Speed KnobGUN Receiver Bushing K1500-2 Trigger InterlockSection C-1 Accessories SectionOptional Kits AccessoriesLF-72s Accessories Key LF-72/74 Section D-1 Maintenance SectionMaintenance MaintenanceCalibration Specification Routine MaintenanceFigure D.1 Figure D.3 Major Component Location Section AA Section AA-1AA-2 WFS Range Wire SizesModel Figure AA.1 AA-3AA-4 AA-5 Coaxial Weld Cable AA-6AA-7 INSTALLATIONAA-7K1797-xx AA-8 AA-9 Drive Roll Kits Steel or Cored WiresFigure AA.3 AA-10Changing the Gun Receiver Bushing AA-11Lation or changing drive rolls and/or GuidesAA-12 Assembly of Drive Rolls and Wire GuidesSet the pressure arm as follows See Figure AA.8 AA-13AA-14 Loading 16 to 44 lb .3 20kg Spools See figure AA.8 AA-15Figure AA.11 AA-16Figure AA.12a AA-17Figure AA.12b AA-18AA-19 Common Equipment SET-UPS AA-20INSTALLATIONAA-20AA-21 Figure AA.15 High Volume ProductionAA-22 Figure AA.16 Portable WeldingSection BB Section BB-1Fcaw Innershield or Outershield BB-2BB-3 Required EquipmentFigure BB.1 Case Front Controls Description BB-4K2426-1 and K2426-2 models BB-5K2426-3 model BB-6 SwitchSection CC-1 CC-2 CC-3 CC-4 CC-5 CC-6 Section DD Section DD-1Nal wiring To verify the wire feed speedWhen inching with gun trigger, electrode WFS knob setting Could remain energized Several secondsDD-3 MAINTENANCEDD-3DD-4 Figure DD.3 Major Component LocationSection E-1 Theory of Operation SectionReturn to Section Theory of OperationControl Board LF-72/74 Section F-1 Troubleshooting & Repair SectionHOW to USE Troubleshooting Guide Troubleshooting & RepairPC Board Troubleshooting Procedures Function Problems Function Problems Troubleshooting & Repair Test Description Drive Motor and Tach Feedback TestTest Procedure GAS Solenoid Test Troubleshooting and RepairFigure F.3 Leads 552, 552B Test ProcedureDiode Bridge Test 552B + 552A Wire Speed Potentiometer Test 14F-14 Wire Speed Potentiometer TestPC Board Removal and Replacement Removal Procedure Replacement Procedure Control PC Board Removal and Replacement ProcedureTroubleshooting and Repair Procedure Wire Drive Motor and Gear BOX Removal and ReplacementProcedure Replacement Procedures Operation Verification SET UPLF-72/74 Section G-1 Electrical Diagrams SectionLF-72/74 Electrical DiagramsTimer 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