Lincoln Electric SVM101-B service manual Overcurrent Protection Current Trigger Test

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F-35

TROUBLESHOOTING & REPAIR

F-35

OVERCURRENT PROTECTION CURRENT TRIGGER TEST

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 pre- cautions detailed throughout this manual.

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

TEST DESCRIPTION

This procedure will determine if the overcurrent trigger circuit is working correctly and also if the current limiting portion of the Control Board is working correctly.

MATERIALS NEEDED

Digital Volt/Ohm Meter (multi-meter)

Misc. Hand Tools

Wiring Diagram (Section G)

V300-I

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Contents Invertec Safety Fumes and Gases can be dangerous Electric Shock can killARC Rays can burn Welding Sparks can cause fire or explosion SafetyCylinder may explode if damaged IiiSûreté Pour Soudage a L’Arc Précautions DE SûretéMaster Table of Contents for ALL Sections Section A-1 Table of ContentsInstallation Section Three Phase Single Phase InstallationProduct Description Electrical Installation 3INSTALLATIONA-3Input Voltage Setup LocationConnection of Wire Feeders to the Invertec Power Input ConnectionSingle Phase Input Three Phase InputParallel Operation Remote Control of InvertecK900-1 DC TIG Starter Connection Quick Disconnect Plugs 6INSTALLATIONA-6Output Cables Section B-1 Operation SectionOperating Instructions OperationDuty Cycle Control Function / OperationFull Range Is Is Very Soft, 10 Is Very Crisp Mode SwitchAuxiliary Power Meter Polarity SwitchSection C-1 Accessories SectionOptions / Accessories AccessoriesSection D-1 Maintenance SectionInput Filter Capacitor Discharge Procedure MaintenanceOverload Protection Preventive MaintenanceFigure D.2 Location of Maintenance Components Section E-1 Theory of Operation SectionInput Line Voltage & Auxiliary Transformer Theory of OperationReturn to Return to Section TOC Precharge & Protection CircuitsFigure E-4 ---SWITCH Circuits & Transformer Switch BoardsFigure E-5 --OUTPUT & Control Circuits Output and Control CircuitsPassive Maximum Output Pulse Width ModulationMinimum Output Thermal Protection Protective CircuitsOverload Protection Section F-1 Troubleshooting & Repair SectionHOW to USE Troubleshooting Guide Troubleshooting & RepairPC Board Troubleshooting Procedures Matched Parts Additional Information Oscilloscope WarningInput Filter Capacitor CONDITION- ING Department Feeding ProblemsFeeding Problems See Input Rectifier test See Output Diodes test See Switch Board test V300-I Input Filter Capacitor Discharge Procedure 11TROUBLESHOOTING & REPAIRF-11Figure F.I Location of Input Filter Capacitor Terminals Input Filter Capacitor Discharge ProcedureOutput Pilot Circuit Test Test Procedure J2 J4 J3 G2527V300-I Protection Board Output Test Turn Power Switch OFF Test Procedure313 306 J15 275F 311 V300-I Figure F.6 Inserting Probes ProtectionCapacitor Balance Test Static Capacitor Test 912 V300-I Switch Board Test Switch Board Test Switch Board Test Table F.3 Snubber Resistor Test Check Test Result Conclusion Next Test Step Repair Action Snubber Resistor TestOutput Diode Test Output Diode Test Test ProcedureInput Rectifier Test Probe Acceptable Meter Reading Table F.5Points Steps Overcurrent Protection Current Trigger Test 302 G2527 Control J1 275D Overcurrent Protection Current Trigger TestControl Overvoltage Protection DC Trigger Circuit Test Figure F.16 PC Boards Removed Overvoltage Protection DC Trigger Circuit Test306 275F 309 310 #313 #275D 1J8 #311 1J14 6J6 #3023J8 2J14 1J6 #301 #305Thermal Protection AC Trigger Circuit Thermal Protection AC Trigger Circuit Figure F.20 PC Boards Moved for AccessFigure F.21 Thermal Protection AC Trigger Circuit V300-I Power Board Test Test B Power Board TestTest a Figure F.23 Power Board Test Points Simplified Trigger Circuit Capacitor Removal and Replacement Procedure Procedure Capacitor Removal and ReplacementFigure F.27 -- Removing Capacitor Nuts Figure F.27 Switch Board Removal and Replacement Procedure Procedure Switch Board ReplacementTest After Switch Board or Capacitor Replacement Perform Retest After Repair Test After Switch Board or Capacitor ReplacementOutput Diode Replacement Procedure Output Diode Replacement Procedure 60TROUBLESHOOTING & REPAIRF-60Procedure Diode Modules 61TROUBLESHOOTING & REPAIRF-61OCV at rated Input V300-PRO Retest After RepairOutput Min. Acceptable Max. All Modes V300-I V300-PROSection G-1 Electrical Diagrams Section#0# Wiring Diagram Entire Machine Code 9826 L8657Return Wiring Diagram Entire Machine Code 9827 L8938Wiring Diagram Entire Machine Code 10036 L9299 $ $ Wiring Diagram Entire Machine Code 10037 L9300Section Wiring Diagram Entire Machine Code 10132 L9567Wiring Diagram Entire Machine Code 10133 L9568 Wiring Diagram Code$& $ Wiring Diagram Entire Machine Code 10258 L10189Wiring Diagram Entire Machine Code 10336, 10450 L10205 V300-I Wiring Diagram European# . $ #$ !#$ #! %&$ Schematic Entire MachineSchematic Driver PC Board S20216 Identification PC Board Assembly Driver L8660Schematic Driver PC Board S20799 Description PC Board Assembly DriverSchematic Switch PC Board L8440 CAPACITOR, Cemo 2700P 50V 5% PC Board Assembly Switch L8441Schematic Switch PC Board L10956 Reqd Identification PC Board Assembly Switch L10958-1Schematic Control PC Board G2525 Electrical Diagrams CAPACITOR, Cemo 150P Schematic Protection PC Board M16097 DZ1 PC Board Assembly Protection L7915-2Schematic Power PC Board M16018 VOLT. REG. & Heat Sink Asbly PC Board Assembly Power L8033-7