Lincoln Electric SVM114-C service manual Troubleshooting and Repair

Page 48

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F-10

TROUBLESHOOTING AND REPAIR

F-10

GAS SOLENOID VALVE AND SOLENOID PC BOARD TEST

(continued)

FIGURE F.3 – APPLIED VOLTAGE POLARITY.

ELECTRODE CABLE

POLARITY

SWITCH

WORK

SENSING LEAD

SOLENOID PC BOARD

1.Apply at least 25 VDC but no more than 100 VDC to the LN-25™ from the electrode cable to the work sensing lead. Make sure the polarity switch is set to match the polarity of the electrode cable. For example, if the electrode cable is positive and the work sensing lead is negative, set the polarity switch to positive. See Figure F.3.

LN-25™

Image 48

Contents Semiautomatic Wire Feeder Safety California Proposition 65 WarningsElectric Shock can kill Fumes and GasesCan be dangerous Welding and Cutting Sparks can Cause fire or explosion Cylinder may explode if damagedIii Précautions DE Sûreté Sûreté Pour Soudage a L’ArcMaster Table of Contents for ALL Sections Table of Contents Installation SectionInstallation Technical Specifications LN-25Wire Feed Speed CurrentrentSafety Precautions Power Source ConnectionINVERTEC, CV300 and Other Newer Lincoln Power Sources GUN Cable Connection to FeederWith CV Adapter For GMA GUN and CablesWire Feed Drive Roll and Guide Tube Kits Weld Cable ConnectionElectrode Cable Connection Work Cable ConnectionLN-25 Operation Section Operation Welding CapabilityRead and Understand Entire Section Before Operating Machine Electrode Polarity Switch Wire Feed Mode SwitchWire Speed Dial and Range Switch LN-25 Instruments ControlsGAS Post PRE-FLOW Timers Optional Work Clip LeadAWG Remote ARC Voltage Control OptionalSequence of Operation Loading ElectrodeMounting 22 to 30 LB READI-REELCOILS Mounting 10 to 30 LB SpoolsLoading Wire Drive Idle Roll Pressure SettingGrooves READI-REEL Inside Cage Wires 6OPERATIONB-6Presetting Wire Feed Speed Setting Constant Wire Feed Speed CV ModeSetting ARC Sensing Wire Feed Speed CC Mode Minimum Arc VoltsFigure B.4 VV CC Wire Speed Setting Making a WeldProcedure AT END of Coil WeldingCylinder may explode if damaged Circuit Protection and Automatic Shutdown Overvoltage ShutdownMotor Overload Shutdown Accessories Section Accessories Section CAccessories LN-25 Option ChartHow to use Table C.1 Table C.1Optional Accessories K434-1 GAS Flow Timer KITGAS Solenoid KIT K430-2 for Codes K433 Power Source Remote BOX K432 Remote Control Cable AssemblyRemote Output Control Options and Control Cable Assemblies LN-25 Contactor KIT K443-1 for CodesK439 Remote Extension Cable Assembly K625, K626, K627 Remote Control Cable AssemblyK624-1 42V Remote Output Control Module K444, K444-1 or K444-2 Remote Voltage Control KITConnector Must be Insulated in this Area To GUN Switch Connect Leads to Pins a and CStyle a DIA. HoleMaintenance Section Maintenance Routine MaintenanceAdjusting Speed Sensor Module Calibration of LN-25 Wire Speed Dial LN-25 Figure E.1 Theory of Operation Block Diagram Theory of Operation SectionInput Power Circuit Theory of OperationGeneral Description Control Circuit OperationFeedback and Control Circuits Trigger CircuitOptional Circuits ContactorGAS Solenoid Later ModelsProtective Devices Circuits Control PC Board FusesLN-25 Troubleshooting and Repair Section 2TROUBLESHOOTING and REPAIRF-2 HOW to USE Troubleshooting GuideTroubleshooting and Repair PC Board Troubleshooting ProceduresFeeding Problems Feeding Problems Hall Effect GAS Solenoid Valve and Solenoid PC Board Test Test DescriptionMaterials Needed For Codes below 10500 onlyTest Procedure Screw Wire Reel Retaining CollarCase Door GAS Solenoid ValveFigure F.2 Solenoid Leads Troubleshooting and Repair GAS Solenoid Valve and Solenoid PC Board Test 512624A 621 J11 PC Board for K430 GAS Solenoid KITLN-25 GAS Solenoid Valve and Control PC Board Test For Codes Above 10500 onlyFor Codes Above 10500 only Figure F.5 Control BOX Cover RemovalSolenoid Leads Figure F.6. Solenoid LeadsFigure F.7. Applied Voltage Polarity Control PC Board Solenoid Circuitry TestG3425 667 555 691 621 500 512 690LN-25 Hall Effect Module Test Hall Effect Module Test G2196 539 541 500539 G1757 Figure F.11 Control PC Board Codes Above LN-25 Wire Drive Motor Test Drive Motor Lead IN-LINE Connector Hall Effect Module Contactor & Contactor PC Board Test Contactor Test Procedure Contactor & Contactor PC Board TestS20963 Contactor Coil Leads28TROUBLESHOOTING and Repair F-28 Contactor PC Board Test667 J14 LN-25 Contactor PC Board Replacement Tools RequiredContactor PC Board Replacement Repair Procedure33TROUBLESHOOTING and Repair F-33 Figure F.17 Control PC Board Replacement Control PC Board Replacement Figure F.21. Control PC Board Codes 9812 and belowFigure F.22. Plug Locations for L12253- Control Board J14Figure F.24. Control Board Replacement PC Board Screw Contactor Replacement For Codes below40TROUBLESHOOTING and Repair F-40 Contactor ReplacementFor Codes Above Figure F.26 Phillips Head Screwdriver Wrench Pliers Present Replacement Purge Switch Leads Solenoid Plug J11GAS Solenoid Valve AND/OR Solenoid PC Board if GAS SolenoidFigure F.29. Solenoid Assembly Wiring Codes 9812 and below Figure F.31. GAS Solenoid Assembly for Earlier Codes Phillips Head Screwdriver Wrench Slot Head Screwdriver 48TROUBLESHOOTING and Repair F-48 Drive Motor and Gearbox Replacement and Access toHall Effect Module Mylar Insulation Electrode CableG1757 Figure F.34. Drive Motor Replacement Retest After Repair LN-25 Electrical Diagrams Table of Contents Electrical Diagrams SectionWiring Diagram Above Code 11140 G4679 Optional 42 Volt Remote Output ControlWiring Diagram Code 10556 Thru 10500 L10925 Wiring Diagram Code 10100 Thru 10500 L9644 Wiring Diagram below Code 9900 L7545 Schematic Complete Machine Codes Above 11140 G5366 LN-25 Across the ARC ModelSchematic Complete Machine below Code 9900 only G1833 Schematic Control PC BD Above Code 11140 G4616-5 Schematic Control PC BD Code 10556 Thru 10558 G3424-3 Schematic Control PC BD Code 10100 Thru 10500 G2194 PC Board Assembly Control Abovr Code 11140 L12253-3 L12253L12253-3 PC Board Assembly Control Code 10556 Thru 10558 G3425-3 G3425PC Board Assembly Control Code 10100 Thru 10500 G2196-1 PC Board Assembly Control below Code 9900 G1757-6 LN-25 ControlSchematic Contactor PC BD Above Code 10500 M10965 ContactorSchematic Contactor PC BD Code 10100 Thru 10500 M17621 Electrical Diagrams Electrical Diagrams PC Board Assembly Contactor Above Code 10500 L10863-1 L10863PC Board Assembly Contactor Code 10100 Thru 10500 L9670-1 PC Board Assembly Contactor below Code 9900 L9185-2