36TROUBLESHOOTING & REPAIRF-36 | Lincoln Electric SVM162-B specification

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F-36TROUBLESHOOTING & REPAIRF-36

ACTIVE SCR TEST (continued)

Figure F.7 - Plug J4 Location

G3909

Plug

J4

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TEST PROCEDURE

1. Remove main supply power to the PRECI- SION TIG 275 machine.

2. Locate and remove plug J4 from the control board. See Figure F.7.

3. Perform the following test for all four SCRs. See Figure F.8.

4.Construct the circuit outline in

One 6V lantern battery can be usedFigure. ResistorF.8. values are +\- 10%. The voltmeter scale should be approximately 0-5 or 0-10 volts.

5.Battery Test - Check the battery by shorting leads (A) and (C) and then close switch SW- 1. Replace the battery if voltage is less than 4.5 volts.

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PRECISION TIG 275

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Lincoln Electric SVM162-B service manual 36TROUBLESHOOTING & REPAIRF-36, Active SCR Test

Contents

Safety Depends on You Precision TIG For Engine SafetyPowered equipment Mar ʻ95 Fumes and Gases ARC Rays can burnAug ʻ06 Cylinder may explode If damaged Welding Sparks canIii LES Machines À Souder À Précautions DE SûretéPrécautions DE Sûreté Pour Transformateur ET À Master Table of Contents for ALL Sections Table of Contents Installation Section Unbalance 70% Penetration AC TIG 15.4 200 100% 28.0 InstallationUnbalance 70% Penetration AC TIG 16.1 255 60% 29.0 225 Unbalance 70% Penetration AC TIG 14.8 150 Output Current Maximum Open Protection Safety PrecautionsSelect Suitable Location Before working on this equip Turn the input power OFF atDisconnect switch or fuse box Ment Work Cable Connection Figure A.2 Auxiliary Power Connections Figure A.3 Robotic Interface Connection Figure A.4 Return to Section TOC Table of Contents Operation Section Product Description OperationPipe Thawing Recommended Processes Equipment Stick mode the Electrode circuits Controls and SettingsWhen the Power Source is on Both the Stick and TIG torch cables AC Balance Ontrol Maximum Output Control The large knob Operation for Codes Above 11000 only Menu Button and Display Switch CodesTIG Mode Menu Select Advanced Panel Controls Gure B.3 Time Control PULSE% on Pulse Frequency ControlPulse Background Current Control TIG Welding Features Internal SET UP ControlsStick Welding Features Step Trigger Modes Figure B.4 TIG Weld Cycle Chart Codes below 11000 K1829-1 Setup Guidelines for TIG Welding With AN Amptrol Figure B.6 Smaw Process Making a TIG Weld with AN AmptrolRecommended Electrode Amperage Ranges Precision TIG Gtaw Process Table of Contents Optional Equipment Accessories for Codes belowMagnum PTA and PTW Series Torches Accessories for Codes Above Return to Section TOC Maintenance Component Location and Access Safety Precautions Overload Protection Spark 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 High VOLTAGE/HIGH Frequency Circuit Figure E.4 High Voltage / High Frequency Circuit DC Welding Output Figure E.5 DC Welding Output AC Welding Output Figure E.7 AC Welding Output SCR Operation Figure E.9 SCR Operation FAN-AS-NEEDED F.A.N 8THEORY of OPERATIONE-8Protection Circuits Thermal Protection Table of Contents Troubleshooting & Repair Section 2TROUBLESHOOTING & REPAIRF-2 HOW to USE Troubleshooting Guide Troubleshooting & Repair Reconnect Troubleshooting GuideProcedure Test Transformer Control BoardSCR Bridge Test Perform the Protection Board Installed, remove it and replaceMachine functions normally T1 Transformer Protection Board See Note belowPerform the T1 Transformer Perform the SCR Bridge Test Perform the SCR Bridge Tests Est Perform the Gas Solenoid Test Electric Shock MaintenanceCan Kill Maintenance Section High frequency transformer See the Maintenance Secti Problems Possible AreasSymptoms Misadjustments Course of Action To Technical Specifications Stick Welding Problems Stick electrode blasts-off Welding current may be too high Function Problems Installation Manual Be plugged into J3 Display switch may be faulty Precision TIG Voltmeter/Ohmmeter Nut Driver Wiring Diagram 19TROUBLESHOOTING & REPAIRF-19Meter Calibration Adjustments Description Meter 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 Protection Board Test Resistance Between Reading 27TROUBLESHOOTING & REPAIRF-27 T1 Main Transformer Test Test Procedures 28TROUBLESHOOTING & REPAIRF-28T1 Main Transformer Test Test Points Acceptable Voltages Primary Windings Return to Section TOC 31TROUBLESHOOTING & REPAIRF-31 GAS Water Solenoid Test GAS Water Solenoid Test Test ProcedureDisable Procedure Perform the High Frequency Circuit 33TROUBLESHOOTING & REPAIRF-33 Static SCR Test Assembly. See SCR Bridge Assembly 34TROUBLESHOOTING & REPAIRF-34Removal and Replacement Static SCR Test Service and repair Active SCR Test 36TROUBLESHOOTING & REPAIRF-36 Active SCR Test Active SCR Test Figure F.9 SCR Gate Locations Scope Settings 39TROUBLESHOOTING & REPAIRF-39DC TIG Mode Typical Output Voltage Waveform Machine Loaded to 2 Amps Milliseconds in time. The machine 40TROUBLESHOOTING & REPAIRF-40AC TIG Mode Was loaded with a resistance grid bank This is the typical DC + output voltage 41TROUBLESHOOTING & REPAIRF-41Typical AC Voltage Waveform Machine Loaded to 50 Amps Horizontal Sweep Ms/Div Typical 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 Removal Procedure 46TROUBLESHOOTING & REPAIRF-46Removal and Replacement Replacement Procedure 47TROUBLESHOOTING & REPAIRF-47 Figure F.11 3/8 Screw & Leads S and F Locations Return to Section TOC Control Board Removal and Replacement 49TROUBLESHOOTING & REPAIRF-49Nut Driver Phillips Head Screwdriver Wire Cutters 50TROUBLESHOOTING & REPAIRF-50 Control Board Removal and Replacement 51TROUBLESHOOTING & REPAIRF-51 J10 J11 J12 Return 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 57TROUBLESHOOTING & REPAIRF-57 Polarity Switch Removal and Replacement 58TROUBLESHOOTING & REPAIRF-58 Polarity Switch Removal and Replacement 59TROUBLESHOOTING & REPAIRF-59 SCR Removal and Replacement SCR Removal and Replacement 60TROUBLESHOOTING & REPAIRF-60Special Instructions Open Circuit Voltages Retest After RepairInput Idle Amps Recommended Meters for Machine Output Tests Return to Section TOC Electrical Diagrams Section Section G Control P.C. Board Schematic Electrical Diagrams Wiring Diagram Entire Machine Code 10806 G4031 Wiring Diagram Entire Machine Code 10807 G4031-1 SCR2 Precision TIG 275 Wiring Diagram Wiring Diagram Entire Machine Code 10893 G4031-2 Precision TIG 275 Wiring Diagram Wiring Diagram Entire Machine Code 11158 G5692Schéma DE Câblage Diagramas DE Cableado Wiring Diagram Entire Machine Code 11159 G5692-1 Robotic Interface Connection Connexion Interface Robotique Schematic Entire Machine below Code 11000 G4075 Return to Section Schematic Entire Machine Above Code 11000 G5691 Change Detail Released from X A.02 Schematic Control PC Board below Code 11000 G3908 Electrical Diagrams Electrical Diagrams PC Board ASSEMBLY-CONTROL below Code 11000 G3909-2 G3909 Schematic Control PC Board Above Code 11000 G4762 Electrical Diagrams Electrical Diagrams Electrical Diagrams Electrical Diagrams PC Board ASSEMBLY-CONTROL Above Code 11000 G4763-1 G4763 SCHEMATIC-PROTECTION P.C. Board M16115 16115 M PC Board ASSEMBLY-PROTECTION M16062-1 Reqd Identification SCHEMATIC-BYPASS / Stabilizer P.C. Board S22530-1 Code 10806 PC Board ASSEMBLY-BYPASS / Stabilizer L10121-1 Code 10806 L10121-1 SCHEMATIC-BYPASS and CE P. C. Board S24206 Code Frame Ground PC Board ASSEMBLY-BYPASS and CE L10882-1 Code Bottom View Schematic 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