Lincoln Electric LF-72/74 service manual Installation, Amp Rating Duty Cycle

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A-2			INSTALLATION			A-2

TECHNICAL SPECIFICATIONS: LF-72 Wire Feeder

	SPEC.# TYPE		WIRE FEED SPEED RANGE

				Wire Size
		LF-72	Speed	Solid	Cored

	K2327-1	Base Model
	K2327-4
	K2327-2	Bench Model	50-800 IPM	.023 - 1/16 in.	.035 - 5/64 in
		Standard Duty	(1.27-20.3 m/m)	(0.6 - 1.6 mm)	(0.9 - 2.0 mm)
	K2327-3	Bench Mode
		Heavy Duty

CONTROL BOX, WIRE DRIVE AND COMPLETE UNITS

SPEC.#

TYPE

INPUT POWER

PHYSICAL SIZE•

TEMPERATURE RATING

Input Voltage

Dimensions

and Current

Height

Width

Depth

Weight

Operating

Storage

43 Lbs

K2327-1

LF-72

11.1“

10.2“

12.9“

(19.7 Kg.)

( 282 mm)

(259 mm)

(328 mm)

K2327-4

Base Model

26.5 Lbs

(12.0 Kg)

Dimensions Δ

Height

Width

Depth

Weight

LF-72

K2327-2

24-42VAC

12.6“

10.9“

22.5“

52.5 Lbs

14°F to 104°F

-40°F to 85°F

Bench

9 AMPS

( 320 mm)

(277 mm)

(572 mm)

(23.8 Kg.)

(-10°C to 40°C)

(-40°C to 85°C)

Standard

Duty

Dimensions Δ

Height

Width

Depth

Weight

LF-72

K2327-3

15.3“

13.0“

27.7“

67.5 Lbs

Bench

( 389 mm)

(330 mm)

(704 mm)

(30.6 Kg.)

Heavy

Duty

WELDING CAPACITY RATING

Amp Rating

Duty Cycle

500 A

60%

400 A

100%

ΔDimensions do not include wire reel.

LF-72/74

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Contents LF-72/74 Safety Electric Shock can kill Welding Sparks can cause fire or explosion Iii Précautions 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 Bench Mount Swivel MountBoom 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 Wire Drive Systems Welding GUN/WIRE Feeder Trigger ConnectorRemote Sense Lead Specifications 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 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 ConnectionRecommended Processes Common Welding AbbreviationsProduct Description 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 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.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 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 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