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Lincoln Electric SVM141-A service manual 253, POS Micro Switch Leads Square Wave TIG

Models: SVM141-A

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F-51

F-51

TROUBLESHOOTING & REPAIR

POLARITY SWITCH REMOVAL AND REPLACEMENT (continued)

FIGURE F.15 – POLARITY SWITCH CONNECTIONS

B

CHOKE

NEG

253

POS

MICRO SWITCH

LEADS

X1

SQUARE WAVE TIG 275

Image 91

Lincoln Electric SVM141-A service manual 253, POS Micro Switch Leads Square Wave TIG

Contents

Square Wave TIG Safety Depends on YouSquare Wave TIG SafetyARC Rays can burn Electric Shock can killFumes and Gases can be dangerous Iii Cylinder may explode if damagedSûreté Pour Soudage a L’Arc Précautions DE SûretéMaster Table of Contents for ALL Sections Table of Contents Installation Section Technical Specifications Square Wave TIG InstallationSafety Precautions Figure A.1 Input Supply ConnectionsReturn to Section TOC To Section TOC Input Reconnect ProcedureTable A.1 User Supplied ConnectorsOutput Connections Work Cable ConnectionCylinder could explode if damaged TIG Torch ConnectionTWIST-MATE Adapter for LW-18 and LW-20 TIG Torch TWIST-MATE Adapter for LA-9 and LA-17 TIG TorchCompleted Assembly Square Wave TIG Table of Contents Operation Section Welding Sparks can cause fire or explosion OperationElectric Shock can kill Fumes and Gases can be dangerousGeneral Description Design Features AdvantagesRecommended Processes and Equipment Limitations Welding CapabilityFigure B.1 Control Panel Controls and SettingsTwist Mate Electrode Welding OperationTIG Welding TIG Welding GuidelinesTable B.2 Recommended Polarity Settings for TIG Welding TIG Welding Sequence of Operation 2-Step TIG ModeTIG Welding Sequence of Operation 4-Step TIG Mode Hand and Foot Amptrol Operation Advanced TIG Welding FeaturesAC Wave Balance and Auto Balance 50/60 Hertz European Machines Auxiliary PowerStick Welding Hertz Domestic MachinesSquare Wave TIG Section C-1Section C-1 Table of Contents AccessoriesOptional Accessories Accessories Included with MachineK963-1, -2 Hand Amptrol Table of Contents Maintenance Section Routine and Periodic Maintenance MaintenanceOverload Protection Display PC BOARD, ARC STARTER/BYPASS PC Board Component Location and AccessSpark GAP ASSEMBLY, High Voltage Transformer Control PC BoardFigure D.2 Major Component Locations Table of Contents Theory of Operation Section Theory of Operation Input Power CircuitFigure E.3 Output RECTIFICATION, Control Board and Feedback Output Rectification Control Board and FeedbackFigure E.4 High Voltage / High Frequency Circuit High Voltage / High Frequency CircuitFigure E.5 DC Welding Output DC Welding OutputFigure E.7 AC Welding Output AC Welding OutputFigure E.9 SCR Operation SCR OperationThermal Protection Protective CircuitsOverload Protection Table of Contents Troubleshooting & Repair Section High Voltage / High Frequency can damage test equipment Troubleshooting & RepairHOW to USE Troubleshooting Guide Disable ProcedurePC Board can be damaged by static electricity PC Board Troubleshooting ProceduresObserve Safety Guidelines Troubleshooting GuideDetailed in the beginning of this manual Perform the SCR Bridge Test Troubleshooting & Repair Connections Troubleshooting Guide Troubleshooting & Repair TIG Welding Problems Can Kill Electric ShockTroubleshooting & Repair To Technical Specifications Stick Welding Problems 15F-15 Function ProblemsFunction Problems Installation Troubleshooting & Repair Test Description High Frequency Circuit Disable ProcedureMaterials Needed Procedure High Frequency Circuit Disable ProcedureT1 Main Transformer Test T1 Main Transformer Test Test ProcedureReplace the case side covers Primary WINDINGS1 Test PointsGAS Water Solenoid Test Figure F.3 GAS Solenoid Location GAS Water Solenoid TestStatic SCR Test Figure F.4 Plug J1 Location on Control Board Static SCR TestAssembly Removal and Replacement Description Active SCR TestFigure F.6 Plug J1 Location on Control Board Active SCR TestFigure F.7 Active SCR Test Setup SCR Bridge Assembly Removal and Replacement Scope Settings AC TIG ModeNormal Open Circuit Voltage Waveform DC TIG Mode AC Stick Mode DC Stick Mode Machine Loaded to 255 Amps Typical Output Voltage Waveform Machine LoadedAT 30 VAC AT 31 VDC Machine Loaded to 275 AmpsAC Stick Mode DC Stick Mode 50 V/Div High Voltage Transformer Removal Replacement Removal Procedure ReplacementHigh Voltage Transformer Removal Figure F.10 High Voltage Transformer Mounting Insulators Replacement ProcedureSCR Bridge Assembly Removal and Replacement Using the 3/8 nut driver, remove the case SCR Bridge Assembly Removal and ReplacementFigure F.13 SCR Bridge Connections Refer to Figures F.11 F.13 Polarity Switch Removal and Replacement Allen Screw Control Knobs Polarity Switch Handle Polarity Switch Removal and Replacement253 POS Micro Switch Leads Square Wave TIGFigure F.16 Polarity Switch Wiring Diagram For Steps 9--17, see Figure F.15 and F.16 Replacement ProcedureDescription Removal and Replacement Main Transformer and Output Choke AssemblyFigure F.18 Transformer Connections POS Micro Switch Leads Figure F.19 Polarity Switch Connections Choke NEGRefer to Figures F.17 F.19 Reassembly ProcedureOpen Circuit Voltages Minimum Acceptable Output Voltage AT Maximum Output SettingRetest After Repair Input Idle AmpsSquare Wave TIG Section G TIG WiringDiagram L10747 ElectricalSquarewave Diagram L10747-2Control Board Schematic G3358-1 Electrical DiagramsOCI4 TRI3 MT2 Control Board Schematic G3358-2Return to Section Return to Section TOC To Section TOC Display Board Schematic L10768Bypass L10770-17-24-98 Display Board Layout L10770-1XXX 10G-10 Bypass Board Layout L10121-1Square Wave TIG