Lincoln Electric SVM101-B service manual Thermal Protection AC Trigger Circuit

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F-44

TROUBLESHOOTING & REPAIR

F-44

THERMAL PROTECTION AC TRIGGER CIRCUIT (cont.)

FIGURE F.20 - PC BOARDS MOVED FOR ACCESS

TEST PROCEDURE

1.Turn main power OFF.

2.Perform Input Filter Capacitor Discharge proce- dure detailed in this 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.)

•Power Board

•Control Board

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

V300-I

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Contents Invertec Safety Fumes and Gases can be dangerous Electric Shock can killARC Rays can burn Cylinder may explode if damaged SafetyWelding Sparks can cause fire or explosion IiiPrécautions DE Sûreté Sûreté Pour Soudage a L’ArcMaster Table of Contents for ALL Sections Section A-1 Table of ContentsInstallation Section Installation Three Phase Single PhaseInput Voltage Setup 3INSTALLATIONA-3Product Description Electrical Installation LocationSingle Phase Input Power Input ConnectionConnection of Wire Feeders to the Invertec Three Phase InputParallel Operation Remote Control of InvertecK900-1 DC TIG Starter Connection Quick Disconnect Plugs 6INSTALLATIONA-6Output Cables Operation Section Section B-1Duty Cycle OperationOperating Instructions Control Function / OperationMode Switch Full Range Is Is Very Soft, 10 Is Very CrispMeter Polarity Switch Auxiliary PowerAccessories Section Section C-1Accessories Options / AccessoriesMaintenance Section Section D-1Maintenance Input Filter Capacitor Discharge ProcedurePreventive Maintenance Overload ProtectionFigure D.2 Location of Maintenance Components Theory of Operation Section Section E-1Theory of Operation Input Line Voltage & Auxiliary TransformerPrecharge & Protection Circuits Return to Return to Section TOCSwitch Boards Figure E-4 ---SWITCH Circuits & TransformerOutput and Control Circuits Figure E-5 --OUTPUT & Control CircuitsPassive Maximum Output Pulse Width ModulationMinimum Output Thermal Protection Protective CircuitsOverload Protection Troubleshooting & Repair Section Section F-1Troubleshooting & Repair HOW to USE Troubleshooting GuidePC Board Troubleshooting Procedures Matched Parts Additional Information Oscilloscope WarningInput Filter Capacitor CONDITION- ING Feeding Problems DepartmentFeeding Problems See Input Rectifier test See Output Diodes test See Switch Board test V300-I 11TROUBLESHOOTING & REPAIRF-11 Input Filter Capacitor Discharge ProcedureInput Filter Capacitor Discharge Procedure Figure F.I Location of Input Filter Capacitor TerminalsOutput Pilot Circuit Test Test Procedure G2527 J2 J4 J3V300-I Protection Board Output Test Test Procedure Turn Power Switch OFF313 306 J15 275F 311 V300-I Protection Figure F.6 Inserting ProbesCapacitor Balance Test Static Capacitor Test 912 V300-I Switch Board Test Switch Board Test Switch Board Test Table F.3 Snubber Resistor Test Snubber Resistor Test Check Test Result Conclusion Next Test Step Repair ActionOutput Diode Test Test Procedure Output Diode TestInput Rectifier Test Probe Acceptable Meter Reading Table F.5Points Steps Overcurrent Protection Current Trigger Test Overcurrent Protection Current Trigger Test 302 G2527 Control J1 275DControl Overvoltage Protection DC Trigger Circuit Test Overvoltage Protection DC Trigger Circuit Test Figure F.16 PC Boards Removed306 275F 309 310 3J8 2J14 1J6 1J8 #311 1J14 6J6 #302#313 #275D #301 #305Thermal Protection AC Trigger Circuit Figure F.20 PC Boards Moved for Access Thermal Protection AC Trigger CircuitFigure 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 Capacitor Removal and Replacement ProcedureFigure F.27 -- Removing Capacitor Nuts Figure F.27 Switch Board Removal and Replacement Procedure Switch Board Replacement ProcedureTest After Switch Board or Capacitor Replacement Test After Switch Board or Capacitor Replacement Perform Retest After RepairOutput Diode Replacement Procedure 60TROUBLESHOOTING & REPAIRF-60 Output Diode Replacement Procedure61TROUBLESHOOTING & REPAIRF-61 Procedure Diode ModulesOutput Retest After RepairOCV at rated Input V300-PRO Min. Acceptable Max. All Modes V300-I V300-PROElectrical Diagrams Section Section G-1Wiring Diagram Entire Machine Code 9826 L8657 #0#Wiring Diagram Entire Machine Code 9827 L8938 ReturnWiring Diagram Entire Machine Code 10036 L9299 Wiring Diagram Entire Machine Code 10037 L9300 $ $Wiring Diagram Entire Machine Code 10132 L9567 SectionWiring Diagram Code Wiring Diagram Entire Machine Code 10133 L9568Wiring Diagram Entire Machine Code 10258 L10189 $& $V300-I Wiring Diagram European Wiring Diagram Entire Machine Code 10336, 10450 L10205Schematic Entire Machine # . $ #$ !#$ #! %&$Schematic Driver PC Board S20216 PC Board Assembly Driver L8660 IdentificationSchematic Driver PC Board S20799 PC Board Assembly Driver DescriptionSchematic Switch PC Board L8440 PC Board Assembly Switch L8441 CAPACITOR, Cemo 2700P 50V 5%Schematic Switch PC Board L10956 PC Board Assembly Switch L10958-1 Reqd IdentificationSchematic Control PC Board G2525 Electrical Diagrams CAPACITOR, Cemo 150P Schematic Protection PC Board M16097 PC Board Assembly Protection L7915-2 DZ1Schematic Power PC Board M16018 PC Board Assembly Power L8033-7 VOLT. REG. & Heat Sink Asbly