Manuals / Lincoln Electric / Power Tools / Welding System

Lincoln Electric SVM162-B 57TROUBLESHOOTING & REPAIRF-57, Polarity Switch Removal and Replacement

Models: SVM162-B

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F-57TROUBLESHOOTING & REPAIRF-57

POLARITY SWITCH REMOVAL AND REPLACEMENT

WARNING

Service and repair should be performed by only Lincoln Electric factory trained personnel. Unauthorized repairs performed on this equipment may result in danger to the technician or machine operator and will invalidate your factory warranty. For your safety and to avoid electrical shock, please observe all safety notes and precautions detailed throughout this manual.

If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, contact the Lincoln Electric Service Department for electrical trou- bleshooting assistance before you proceed. Call 1-888-935-3877.

DESCRIPTION

This procedure will aid the technician in the removal and replacement of the polarity switch.

MATERIALS NEEDED

3/8” Nut Driver

1/2” Wrench

7/16” Wrench

Phillips Head Screw Driver

Slot Head Screw Driver (2 Required)

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PRECISION TIG 275

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Lincoln Electric SVM162-B service manual 57TROUBLESHOOTING & REPAIRF-57, Polarity Switch Removal and Replacement

Contents

Precision TIG Safety Depends on YouMar ʻ95 SafetyPowered equipment For EngineFumes and Gases ARC Rays can burnAug ʻ06 Cylinder may explode If damaged Welding Sparks canIii Transformateur ET À Précautions DE SûretéPrécautions DE Sûreté Pour LES Machines À Souder ÀMaster Table of Contents for ALL Sections Table of Contents Installation Section Unbalance 70% Penetration AC TIG 14.8 150 InstallationUnbalance 70% Penetration AC TIG 16.1 255 60% 29.0 225 Unbalance 70% Penetration AC TIG 15.4 200 100% 28.0Maximum Open Output CurrentProtection Safety PrecautionsSelect Suitable Location Ment Turn the input power OFF atDisconnect switch or fuse box Before working on this equipWork Cable Connection Figure A.2 Figure A.3 Auxiliary Power ConnectionsFigure A.4 Robotic Interface ConnectionReturn to Section TOC Table of Contents Operation Section Product Description OperationPipe Thawing Equipment Recommended ProcessesBoth the Stick and TIG torch cables Controls and SettingsWhen the Power Source is on Stick mode the Electrode circuitsMaximum Output Control The large knob AC Balance OntrolSelect Menu Button and Display Switch CodesTIG Mode Menu Operation for Codes Above 11000 onlyGure B.3 Advanced Panel ControlsTime Control PULSE% on Pulse Frequency ControlPulse Background Current Control TIG Welding Features Internal SET UP ControlsStick Welding Features Step Trigger Modes Figure B.4 Codes below 11000 K1829-1 TIG Weld Cycle ChartFigure B.6 Setup Guidelines for TIG Welding With AN AmptrolGtaw Process Making a TIG Weld with AN AmptrolRecommended Electrode Amperage Ranges Precision TIG Smaw ProcessTable of Contents Optional Equipment Accessories for Codes belowMagnum PTA and PTW Series Torches Accessories for Codes Above Return to Section TOC Component Location and Access MaintenanceOverload Protection Safety PrecautionsSpark GAP Adjustment Service ProceduresUNDER-COOLER Service Warni Table of Contents Theory of Operation Section Theory of Operation Input Power CircuitGeneral Description Control board also monitors the thermostats Output RectificationSee SCR Operation Figure 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 8THEORY of OPERATIONE-8Protection Circuits FAN-AS-NEEDED F.A.NTable of Contents Troubleshooting & Repair Section HOW to USE Troubleshooting Guide 2TROUBLESHOOTING & REPAIRF-2Troubleshooting & Repair Test Troubleshooting GuideProcedure ReconnectTransformer Control BoardSCR Bridge Test T1 Transformer Installed, remove it and replaceMachine functions normally Perform the Protection BoardProtection Board See Note belowPerform the T1 Transformer Perform the SCR Bridge Test Perform the SCR Bridge Tests Perform the Gas Solenoid Test EstElectric Shock MaintenanceCan Kill High frequency transformer Maintenance SectionTo Technical Specifications Problems Possible AreasSymptoms Misadjustments Course of Action See the Maintenance SectiStick electrode blasts-off Welding current may be too high Stick Welding ProblemsFunction Problems Be plugged into J3 Installation ManualDisplay switch may be faulty Precision TIG Description 19TROUBLESHOOTING & REPAIRF-19Meter Calibration Adjustments Voltmeter/Ohmmeter Nut Driver Wiring DiagramMeter Calibration Adjustments 20TROUBLESHOOTING & REPAIRF-20Calibration Check Ammeter Calibration Procedure 21TROUBLESHOOTING & REPAIRF-21Control board. See Figure F1 Return to Section TOC High Frequency Circuit Disable Procedure 23TROUBLESHOOTING & REPAIRF-23Nut Driver Electrical Insulating Tape High Frequency Circuit Disable Procedure 24TROUBLESHOOTING & REPAIRF-24Procedure Protection Board Test 25TROUBLESHOOTING & REPAIRF-25Test Description Resistance Between Reading Protection Board TestT1 Main Transformer Test 27TROUBLESHOOTING & REPAIRF-27Test Procedures 28TROUBLESHOOTING & REPAIRF-28T1 Main Transformer Test Primary Windings Test Points Acceptable VoltagesReturn to Section TOC GAS Water Solenoid Test 31TROUBLESHOOTING & REPAIRF-31Perform the High Frequency Circuit Test ProcedureDisable Procedure GAS Water Solenoid TestStatic SCR Test 33TROUBLESHOOTING & REPAIRF-33Static SCR Test 34TROUBLESHOOTING & REPAIRF-34Removal and Replacement Assembly. See SCR Bridge AssemblyActive SCR Test Service and repairActive SCR Test 36TROUBLESHOOTING & REPAIRF-36Active SCR Test Figure F.9 SCR Gate Locations Typical Output Voltage Waveform Machine Loaded to 2 Amps 39TROUBLESHOOTING & REPAIRF-39DC TIG Mode Scope SettingsWas loaded with a resistance grid bank 40TROUBLESHOOTING & REPAIRF-40AC TIG Mode Milliseconds in time. The machineHorizontal Sweep Ms/Div 41TROUBLESHOOTING & REPAIRF-41Typical AC Voltage Waveform Machine Loaded to 50 Amps This is the typical DC + output voltageTypical AC Voltage Waveform Machine Loaded to 2 Amps 42TROUBLESHOOTING & REPAIRF-42AC Balance Control in Auto Output Control AT Minimum 43TROUBLESHOOTING & REPAIRF-43 Return to Section TOC High Voltage Transformer Removal and Replacement 45TROUBLESHOOTING & REPAIRF-45Nut Driver Phillips Head Screwdriver Off-set Wire Cutters Replacement Procedure 46TROUBLESHOOTING & REPAIRF-46Removal and Replacement Removal ProcedureFigure F.11 3/8 Screw & Leads S and F Locations 47TROUBLESHOOTING & REPAIRF-47Return to Section TOC Control Board Removal and Replacement 49TROUBLESHOOTING & REPAIRF-49Nut Driver Phillips Head Screwdriver Wire Cutters Control Board Removal and Replacement 50TROUBLESHOOTING & REPAIRF-50J10 J11 J12 51TROUBLESHOOTING & REPAIRF-51Return to Section TOC SCR Bridge Assembly Removal and Replacement 53TROUBLESHOOTING & REPAIRF-53Nut Driver Pliers Crimp Wire Cutters SCR Bridge Assembly Removal and Replacement 54TROUBLESHOOTING & REPAIRF-54See Figure F.14 SCR Bridge Removal and Replacement Diode Stud Foot Inch Size Pounds Mounting of Stud Type Diodes to Aluminum Heat Sinks CONT’D25-27 300-324 10±.5 125+0/-5 22-25 Polarity Switch Removal and Replacement 57TROUBLESHOOTING & REPAIRF-57Polarity Switch Removal and Replacement 58TROUBLESHOOTING & REPAIRF-58SCR Removal and Replacement 59TROUBLESHOOTING & REPAIRF-59SCR Removal and Replacement 60TROUBLESHOOTING & REPAIRF-60Special Instructions Recommended Meters for Machine Output Tests Retest After RepairInput Idle Amps Open Circuit VoltagesReturn to Section TOC Control P.C. Board Schematic Electrical Diagrams Section Section GWiring Diagram Entire Machine Code 10806 G4031 Electrical DiagramsSCR2 Wiring Diagram Entire Machine Code 10807 G4031-1Wiring Diagram Entire Machine Code 10893 G4031-2 Precision TIG 275 Wiring DiagramPrecision TIG 275 Wiring Diagram Wiring Diagram Entire Machine Code 11158 G5692Schéma DE Câblage Diagramas DE Cableado Robotic Interface Connection Connexion Interface Robotique Wiring Diagram Entire Machine Code 11159 G5692-1Return to Section Schematic Entire Machine below Code 11000 G4075Change Detail Released from X A.02 Schematic Entire Machine Above Code 11000 G5691Schematic Control PC Board below Code 11000 G3908 Electrical Diagrams Electrical Diagrams G3909 PC Board ASSEMBLY-CONTROL below Code 11000 G3909-2Schematic Control PC Board Above Code 11000 G4762 Electrical Diagrams Electrical Diagrams Electrical Diagrams Electrical Diagrams G4763 PC Board ASSEMBLY-CONTROL Above Code 11000 G4763-116115 M SCHEMATIC-PROTECTION P.C. Board M16115Reqd Identification PC Board ASSEMBLY-PROTECTION M16062-1SCHEMATIC-BYPASS / Stabilizer P.C. Board S22530-1 Code 10806 L10121-1 PC Board ASSEMBLY-BYPASS / Stabilizer L10121-1 Code 10806Frame Ground SCHEMATIC-BYPASS and CE P. C. Board S24206 CodeBottom View PC Board ASSEMBLY-BYPASS and CE L10882-1 CodeSchematic TIG Option P.C. Board below Code 11000 G4039 Electrical Diagrams Return to Section TOC To Section TOC Schematic TIG Option P.C. Board Above Code 11000 G4760 Electrical Diagrams Electrical Diagrams MAK E Detail SVM Error Reporting Form