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Lincoln Electric SVM150-A Figure F.19 Diode Module Test Heat Sink Terminals, Check Diode Module

Models: SVM150-A

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F-42

F-42

TROUBLESHOOTING & REPAIR

POWER MODULE TEST (continued)

FIGURE F.19 – DIODE MODULE TEST

HEAT SINK

DIODE

MODULE

TERMINALS

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Check Diode Module

10.Using the analog ohmmeter, connect the negative meter probe to the terminal on the diode module. See Figure F.19. Connect the positive meter probe to the heat sink. The resistance should be very high (over 20,000 ohms).

11.Using the analog ohmmeter, connect the positive meter probe to the terminal on the diode module. Connect the negative meter probe to the heat sink. The resistance should be lower (approximately 300 ohms). Also check diode D4 for shorted or open condition. See the Wiring Diagram.

When all tests are complete:

1.Reconnect all leads previously removed.

2.Torque the capacitor nuts to 50-60 inch- pounds.

3.If finished testing, perform the Case Cover Replacement procedure.

RANGER 250

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Lincoln Electric SVM150-A service manual Figure F.19 Diode Module Test Heat Sink Terminals, Check Diode Module

Contents

Ranger TM Safety RangerFumes and Gases can be dangerous Electric Shock can killARC Rays can burn Iii Welding Sparks can cause fire or explosionCylinder may explode if damaged Précautions DE Sûreté Sûreté Pour Soudage a L’ArcMaster Table of Contents for ALL Sections Table of Contents Installation Section Installation Technical Specifications Ranger 250 K1725-1/K1725-2Weight Speed RPMSafety Precautions Location and VentilationAdditional Safety Precautions Electrical Output Connections Welding Output Cables Figure A.1 Ranger 250 Output ConnectionsCable Installation Auxiliary Power ReceptaclesStandby Power Connections Cable Cable Size for Amps Length 100% Duty CycleFigure A.2 Connection of the Ranger 250 to Premises Wiring Table of Contents Operation Section Operating Instructions Safety InstructionsOperation Design Features Controls and SettingsEngine Controls Figure B.1 Case Front Panel ControlsEngine Operation Welding ControlsBefore Starting the Engine Check and fill the engine oil levelBREAK-IN Period Starting the EngineStopping the Engine Table B.1 Typical Ranger 250 Fuel Consumption Welder OperationGeneral Information Stick Welding Constant Current CC-STICK WeldingPipe Welding Table B.2 Typical Current RANGES1 for Tungsten ELECTRODES2Auxiliary Power Wire WELDING-CVTIG Welding ARC GougingSimultaneous Welding and Auxiliary Power Loads Table B.4 Ranger 250 Simultaneous Welding and Power LoadsTable of Contents Accessories OPTIONS/ACCESSORIES Field Installed OptionsTIG Welding Accessories Semiautomatic Fcaw and MIG Welding AccessoriesConnection of Lincoln Electric Wire Feeders Accessories Place the Weld Terminals switch Return to Section TOC To Section TOC Accessories Terminals Remotely Controlled Figure C.7 Ranger 250/LN-742 Connection Diagram Connection of the LN-742 to Ranger 250 see Figure C.7Ranger Table of Contents Maintenance Routine and Periodic Maintenance Engine MaintenanceTable D.2 Onan Engine Maintenance Schedule Frequency Maintenance RequiredAIR Cleaner Service Air Pre-Cleaner ServiceEngine OIL Change Engine Oil Refill CapacitiesAir Filter Paper Element Service Spark Plug ServiceFuel Filter Service Engine Adjustment Overspeed is HazardousBattery Maintenance Cleaning the BatteryCharging the Battery Optional Spark ArrestorWELDER/GENERATOR Maintenance Figure D.1 Major Component Locations Table of Contents Theory of Operation Section Theory of Operation General DescriptionWeld WINDINGS, RECTIFIER, Power Module and Feedback Return toAnalog Power Board and Control Board Figure E.4 Analog Power Board and Control BoardInsulated Gate Bipolar Transistor Igbt Operation Maximum Output Pulse Width ModulationMinimum Output Switch 85VDC Diode Chopper Technology FundamentalsRanger Table of Contents Troubleshooting & Repair Section Troubleshooting & Repair HOW to USE Troubleshooting GuidePC Board Troubleshooting Procedures PC Board can be damaged by static electricityDetailed in the beginning of this manual Troubleshooting GuideObserve Safety Guidelines Test Stator Voltage Test Engine Function Problems Engine Problems Troubleshooting & Repair Engine Problems Welding Problems Materials Needed Case Cover Removal and Replacement ProcedureTest Description Replacement Procedure Case Cover Removal and Replacement ProcedureRemoval Procedure Power Module Capacitor Discharge Procedure Power Module Capacitor Discharge Procedure Test ProcedureIdler Solenoid Test Idler Solenoid Test Figure F.3 Idler Solenoid LeadsEngine Throttle Adjustment Test Engine Throttle Adjustment Test Strobe-Tach MethodFigure F.5 High Idle Adjustment Frequency Counter MethodOscilloscope Method Vibratach MethodRotor Resistance Test Rotor Resistance Test Figure F.7 Rotor Brush Leads Slip Rings BrushesFlashing and Rotor Voltage Test Oil Pressure Switch Test Flashing and Rotor Voltage TestFigure F.9 Field Diode Rectifier Bridge and Filter Capacitor Stator Voltage Tests To test the 240 VAC winding Stator Voltage TestsTo test the 120 VAC winding Field Rectifier Bridge Retaining TAB Cable Capacitor To test the field windingFigure F.12 14-PIN Amphenol PIN Assignments To test the feeder windingChoke To test the stator weld windingsAnalog Power PC Board Voltage Test Analog Power PC Board Voltage Test Figure F.14 Analog Power PC Board+20 VDC +5 VDC+15 VDC 15 VDCOutput Rectifier Bridge Test Output Rectifier Bridge Test Figure F.15 Plug J41 and Resistor R3 LocationsWhen all tests are complete Description Power Module TestOther PC board components could be faulty Power Module Test Figure F.17 Power Module ConnectionsTor terminal on the power module chopper Check Igbt for ShortsFigure F.19 Diode Module Test Heat Sink Terminals Check Diode ModuleFlywheel Alternator Test Flywheel Alternator Test Figure F.20 Plug J51 PIN LocationHigh Idle no Load Scope SettingsNormal Open Circuit Voltage Waveform 120VAC Supply Normal Open Circuit Voltage Waveform Stick MAX Control POT High Idle no LoadNormal Weld Voltage Waveform Stick CC Machine Loaded to 250 Amps AT 25 VoltsNormal Open Circuit Voltage Waveform Wire CV TAP Normal Weld Voltage Waveform Wire CV Machine Loaded to 250 Amps AT 28 VoltsDescription Removal Power Module Assembly Removal and ReplacementProcedure Replacement Power Module AssemblyRemoval and Replacement Power Module PC Board Removal and Replacement Figure F.22 Diode MODULE/POWER Module Assembly DetailsFigure F.23 Diode Module Mounting Details Power Capacitor Removal and Replacement Power Capacitor Removal and Replacement Output Rectifier Bridge and Choke Removal and Replacement Output Rectifier Bridge and Choke Output RectifierOutput Choke ENGINE/STATOR/ROTOR Removal and Replacement ENGINE/STATOR/ROTOR Removal and Replacement Engine Preparation and Lead DisconnectionTroubleshooting & Repair Figure F.28 Stator Leads Front Panel Stator Lead DisconnectionFigure F.29 ENGINE/STATOR/ROTOR Assembly Removal Engine/Stator/Rotor Assembly Removal ProcedureStator/Rotor Assembly Removal Figure F.30 Stator and Rotor RemovalReassembly Notes Rotor/Stator/Engine ReassemblyLead Reconnection Checklist General Notes on ReassemblyAuxiliary Power Output Volt Wire Feeder PowerRetest After Repair Engine OutputElectrical Diagrams Table of Contents Electrical Diagrams SectionRanger 250 Kohler Wiring Diagram Wiring Diagram Ranger 250 KohlerRanger 250 Onan Wiring Diagram Wiring Diagram Ranger 250 Onan4ELECTRICAL DIAGRAMSG-4 Control INTER-CONNECTION DiagramSchematic Complete Machine Output TerminalSchematic Analog Control Power Supply Schematic Battery Printed Circuit Board Schematic Bypass Printed Circuit Board Schematic Chopper Printed Circuit Board 19462 MSchematic Display Printed Circuit Board 24660SSchematic Weld Control Printed Circuit Board Sheet Electrical Diagrams Electrical Diagrams Electrical Diagrams Electrical Diagrams SVM Error Reporting Form