Lincoln Electric LF-72/74 manuals
Power Tools > Welder
When we buy new device such as Lincoln Electric LF-72/74 we often through away most of the documentation but the warranty.
Very often issues with Lincoln Electric LF-72/74 begin only after the warranty period ends and you may want to find how to repair it or just do some service work.
Even oftener it is hard to remember what does each function in Welder Lincoln Electric LF-72/74 is responsible for and what options to choose for expected result.
Fortunately you can find all manuals for Welder on our side using links below.
Lincoln Electric LF-72/74 Service Manual
119 pages 6.09 Mb
LF-72/74SVM171-A SERVICE MANUALSafety Depends on You FOR ENGINE powered equipment. 2 WARNINGELECTRIC AND MAGNETIC FIELDS may be dangerous 3 ARC RAYS can burn.FUMES AND GASES can be dangerous. 4 FOR ELECTRICALLY powered equipment.CYLINDER may explode if damaged. WELDING SPARKS can cause fire or explosion. 5 PRCAUTIONS DE SRETPRCAUTIONS DE SRET POUR LES MACHINES SOUDER TRANSFORMATEUR ET REDRESSEUR 6 MASTER TABLE OF CONTENTS FOR ALL SECTIONS7 -INSTALLATION SECTION -14 NOTES27 -OPERATION SECTION -43 -INSTALLATION SECTION -65 -OPERATION SECTION --THEORY OF OPERATION SECTION -FIGURE E.1 LF-72/74 BLOCK LOGIC DIAGRAM 81 CONTROL BOARDCONTROL BOARD 82 THEORY OF OPERATIONGENERAL DESCRIPTION INPUT RECEPTACLE, CONTROL BOARD AND OPERATOR CON- TROLS 83 THEORY OF OPERATIONDRIVE MOTOR, TACH FEEDBACK AND GAS SOLENOID CONTROL BOARD 85 -TROUBLESHOOTING & REPAIR SECTION -107 -ELECTRICAL DIAGRAMS SECTION -108 ELECTRICAL DIAGRAMS WIRING DIAGRAM - ENTIRE MACHINE - CODE 11075, 11076, 11077 (L12146) LF-72J6 P8 P5 L12146 J4W- WHITEP9POST-FLOW BURNBACK TIMERKIT G-2 109 ELECTRICAL DIAGRAMS WIRING DIAGRAM - ENTIRE MACHINE - CODE 11209, 11210, 11211,11227 (L12146-1) LF-72J6 P8 P5 L12146-1 J4W- WHITEPOST-FLOW BURNBACK TIMERKIT G-3 110 ELECTRICAL DIAGRAMS WIRING DIAGRAM - ENTIRE MACHINE - CODE 11290, 11291, 11292,11293 (L12146-2) LF-72N.E. N.D. N.A.L6 P4 P6 J12 L12146-2 J13GENERALINFORMATION ELECTRICALSYMBOLS PER E1537 COLORCODE B- BLACK W- WHITE R-RED U- BLUE INPUT ELECTRODE CABLECONNECTION N.A. G-4 111 ELECTRICAL DIAGRAMS WIRING DIAGRAM - ENTIRE MACHINE - CODE 11195, 11196, 11197, (L12484) LF-74N.E.L6 P4 P6 J12 L12484 J13GENERALINFORMATION ELECTRICALSYMBOLS PER E1537 COLORCODE B- BLACK W- WHITE R-RED U- BLUE NORMALSPEED HIGH TORQUE G-5 112 ELECTRICAL DIAGRAMS SCHEMATIC - ENTIRE MACHINE - CODE 11075, 11076, 11077 (G4617) LF-72 is 1.5 ohms J4P9 J6 5 VDC 1.6V @ 50IPM current exceeds 4 Amps foran Plug for future run-in kit. internalpanelOn power-up, the LF-72 will light the If the feeder is powered-up with the until the trigger is released and then ToPower Source Electrode Connection ControlBoard Summar y Locatedbehind front panel G-6 113 ELECTRICAL DIAGRAMS SCHEMATIC - ENTIRE MACHINE - CODE 11209, 11210, 11211,11227 (G4617-1) LF-72 is 1.5 ohms J4J6 1.6V @ 50IPM current exceeds 4 Amps foranOn = 7.7 VDC 5VDC MAX.WFS 15VDC Open internalpanelOn power-up, the LF-72 will light the Ifthe feeder is powered-up with the until the trigger is released and then To Power Source ElectrodeConnection ControlBoard Summar y P8 G-7 114 ELECTRICAL DIAGRAMS SCHEMATIC - ENTIRE MACHINE - CODE 11290, 11291, 11292,11293 (G4617-2) LF-72on sheetpanel y rSheetPanel CaseBack is 1.5 ohmsTheWFS range of the LF-72 is 50-800ipm. J13J12 1.6V @ 100IPM current exceeds 3.75Amps foranOn= 7.7 VDC Values forCV305. Others NotesTo Power Source ElectrodeConnection ControlBoard Summar y LocatedonCase Front Leads Pass toroid 3 times. behindsheet panel MotorConnecte Summar P6not used required for LF-74 only.. G-8 115 ELECTRICAL DIAGRAMS SCHEMATIC - ENTIRE MACHINE - CODE 11195, 11196, 11197, (G4942) LF-74SheetPanel CaseBack J13J12 15VDC in 5 VDC 1.6V @ 100IPM current exceeds 3.75Amps foran release trigger to end the weld.On power-up, the LF-74 will light the If the feederis powered-up with the until thetrigger is released and then NotesTheWFS range of this code of LF-74is 100-800 ipm. The WFS range of the LF-72is 50-800 ipm. ToPower Source Electrode Connection ControlBoard Summar y LocatedonCase Front Haspotentiometers for burnbackand postflow. Postflowrange is0.25 to10 sec. ReceivesGas FlowEnable signal. bysheetpanel Motor resistance is 1.5 ohms NORMAL SPEED HIGH TORQUE Leads Pass toroid 3 times. onsheetpanel MotorConnecter Summar 40pole ring magnet 284 pulses/sec @ 100 IPM 1139 pulses/sec @ 400 IPM G-9
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