Lincoln Electric SVM101-B service manual Overvoltage Protection DC Trigger Circuit Test

Page 69

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F-39

TROUBLESHOOTING & REPAIR

F-39

OVERVOLTAGE PROTECTION DC TRIGGER CIRCUIT TEST (cont.)

FIGURE F.16 - PC BOARDS REMOVED

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TEST PROCEDURE

1.Turn main power OFF.

2.Perform Input Filter Capacitor Discharge procedure detailed in Maintenance section.

3.Detach the following PC boards so you can gain access to and have ample room to perform the tests: (Do not disconnect from wiring harness.)

•Control Board

•Protection Board

•Power Board

NOTE: Do not disconnect any wires. The machine must be functional to perform tests.

4.Arrange the PC boards and wiring so you can easi- ly perform the tests.

NOTE: Do not allow live connections to touch each other.

5.Turn main power ON.

6.Move the Output Terminal Switch S4 to the ON posi- tion (closed).

V300-I

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Contents Invertec Safety Electric Shock can kill ARC Rays can burnFumes and Gases can be dangerous 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 Table of Contents Installation SectionSection A-1 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 InputRemote Control of Invertec K900-1 DC TIG Starter ConnectionParallel Operation 6INSTALLATIONA-6 Output CablesQuick Disconnect Plugs 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 Pulse Width Modulation Minimum OutputMaximum Output Protective Circuits Overload ProtectionThermal Protection Section F-1 Troubleshooting & Repair SectionHOW to USE Troubleshooting Guide Troubleshooting & RepairPC Board Troubleshooting Procedures Additional Information Oscilloscope Warning Input Filter Capacitor CONDITION- INGMatched Parts 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 Table F.5 Points StepsProbe Acceptable Meter Reading 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 Power Board Test Test aTest B 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