Output Diode Test | Lincoln Electric SVM101-B instruction

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F-31

TROUBLESHOOTING & REPAIR

F-31

OUTPUT DIODE 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 Output Diodes are defective.

MATERIALS NEEDED

Volt/Ohm Meter (multi-meter)

Wiring Diagram (Section G)

V300-I

Image 61

Lincoln Electric SVM101-B service manual Output Diode Test

Contents

Invertec Safety ARC Rays can burn Electric Shock can killFumes and Gases can be dangerous Welding Sparks can cause fire or explosion SafetyCylinder may explode if damaged Iii Sûreté Pour Soudage a L’Arc Précautions DE Sûreté Master Table of Contents for ALL Sections Installation Section Table of ContentsSection A-1 Three Phase Single Phase Installation Product Description Electrical Installation 3INSTALLATIONA-3Input Voltage Setup Location Connection of Wire Feeders to the Invertec Power Input ConnectionSingle Phase Input Three Phase Input K900-1 DC TIG Starter Connection Remote Control of InvertecParallel Operation Output Cables 6INSTALLATIONA-6Quick Disconnect Plugs Section B-1 Operation Section Operating Instructions OperationDuty Cycle Control Function / Operation Full Range Is Is Very Soft, 10 Is Very Crisp Mode Switch Auxiliary Power Meter Polarity Switch Section C-1 Accessories Section Options / Accessories Accessories Section D-1 Maintenance Section Input Filter Capacitor Discharge Procedure Maintenance Overload Protection Preventive Maintenance Figure D.2 Location of Maintenance Components Section E-1 Theory of Operation Section Input Line Voltage & Auxiliary Transformer Theory of Operation Return to Return to Section TOC Precharge & Protection Circuits Figure E-4 ---SWITCH Circuits & Transformer Switch Boards Figure E-5 --OUTPUT & Control Circuits Output and Control Circuits Passive Minimum Output Pulse Width ModulationMaximum Output Overload Protection Protective CircuitsThermal Protection Section F-1 Troubleshooting & Repair Section HOW to USE Troubleshooting Guide Troubleshooting & Repair PC Board Troubleshooting Procedures Input Filter Capacitor CONDITION- ING Additional Information Oscilloscope WarningMatched Parts Department Feeding Problems Feeding Problems See Input Rectifier test See Output Diodes test See Switch Board test V300-I Input Filter Capacitor Discharge Procedure 11TROUBLESHOOTING & REPAIRF-11 Figure F.I Location of Input Filter Capacitor Terminals Input Filter Capacitor Discharge Procedure Output Pilot Circuit Test Test Procedure J2 J4 J3 G2527 V300-I Protection Board Output Test Turn Power Switch OFF Test Procedure 313 306 J15 275F 311 V300-I Figure F.6 Inserting Probes Protection Capacitor 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 Test Output Diode Test Output Diode Test Test Procedure Input Rectifier Test Points Steps Table F.5Probe Acceptable Meter Reading Overcurrent Protection Current Trigger Test 302 G2527 Control J1 275D Overcurrent Protection Current Trigger Test Control Overvoltage Protection DC Trigger Circuit Test Figure F.16 PC Boards Removed Overvoltage Protection DC Trigger Circuit Test 306 275F 309 310 #313 #275D 1J8 #311 1J14 6J6 #3023J8 2J14 1J6 #301 #305 Thermal Protection AC Trigger Circuit Thermal Protection AC Trigger Circuit Figure F.20 PC Boards Moved for Access Figure F.21 Thermal Protection AC Trigger Circuit V300-I Power Board Test Test a Power Board TestTest B Figure F.23 Power Board Test Points Simplified Trigger Circuit Capacitor Removal and Replacement Procedure Procedure Capacitor Removal and Replacement Figure F.27 -- Removing Capacitor Nuts Figure F.27 Switch Board Removal and Replacement Procedure Procedure Switch Board Replacement Test After Switch Board or Capacitor Replacement Perform Retest After Repair Test After Switch Board or Capacitor Replacement Output Diode Replacement Procedure Output Diode Replacement Procedure 60TROUBLESHOOTING & REPAIRF-60 Procedure Diode Modules 61TROUBLESHOOTING & REPAIRF-61 OCV at rated Input V300-PRO Retest After RepairOutput Min. Acceptable Max. All Modes V300-I V300-PRO Section G-1 Electrical Diagrams Section #0# Wiring Diagram Entire Machine Code 9826 L8657 Return Wiring Diagram Entire Machine Code 9827 L8938 Wiring Diagram Entire Machine Code 10036 L9299 $ $ Wiring Diagram Entire Machine Code 10037 L9300 Section Wiring Diagram Entire Machine Code 10132 L9567 Wiring Diagram Entire Machine Code 10133 L9568 Wiring Diagram Code $& $ Wiring Diagram Entire Machine Code 10258 L10189 Wiring Diagram Entire Machine Code 10336, 10450 L10205 V300-I Wiring Diagram European # . $ #$ !#$ #! %&$ Schematic Entire Machine Schematic Driver PC Board S20216 Identification PC Board Assembly Driver L8660 Schematic Driver PC Board S20799 Description PC Board Assembly Driver Schematic Switch PC Board L8440 CAPACITOR, Cemo 2700P 50V 5% PC Board Assembly Switch L8441 Schematic Switch PC Board L10956 Reqd Identification PC Board Assembly Switch L10958-1 Schematic Control PC Board G2525 Electrical Diagrams CAPACITOR, Cemo 150P Schematic Protection PC Board M16097 DZ1 PC Board Assembly Protection L7915-2 Schematic Power PC Board M16018 VOLT. REG. & Heat Sink Asbly PC Board Assembly Power L8033-7