Lincoln Electric SVM208-A Rotor Voltage Test, Lead 200A Connection Ground Stud, Procedure

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F-14	TROUBLESHOOTING AND REPAIR	F-14

ROTOR VOLTAGE TEST (continued)

FIGURE F.1 – LOCATION OF LEAD 200A FOR ROTOR VOLTAGE TEST

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LEAD 200A CONNECTION

GROUND STUD

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PROCEDURE

1.With the 3/8” nut driver, remove the 4 sheet metal screws that hold the top cover to the con- trol box. Remove the top cover.

2.Start the machine and run it at high idle. Set the output control (rheostat) at the MAXIMUM or GENERATOR setting.

3.Set the volt/ohmmeter at the DC position.

4.Place the positive probe on lead 200A (Blue and Brown wires joined together) where it con- nects at the back of the rheostat. See Figure F.1 for location. Place the negative probe on the machine ground stud or any other good, unpainted ground.

5.Check the voltage reading on the volt/ohmme- ter. It should read 37.5 - 42.5 VDC.

6.If the voltage is low or not present, the genera- tor field circuit is not functioning correctly. Proceed with the Rotor Resistance Test. C1, R1, or D2 may also be faulty.

7.If rotor voltage is correct, the generator field is okay. Replace the top cover on the control box. Tighten the 4 sheet metal screws with the 3/8” nut driver.

BULLDOG® 140

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Contents Bulldog Safety California Proposition 65 WarningsElectric Shock can kill ARC Rays can burn Can be dangerousIii Welding and Cutting Sparks can cause fire or explosionCylinder may explode if damaged Précautions DE Sûreté Sûreté Pour Soudage a L’ArcSafety Methods of Reducing Emissions Mains Supply Master Table of Contents for ALL Sections Table of Contents Installation Section Installation Technical Specifications Bulldog 140 K2708-1Storing Safety PrecautionsLocation and Ventilation Engine Exhaust can killTilting PRE-OPERATION Engine ServiceStacking OILTable A.1 Recommended Welding Cable Size and Length Electrical Output CONNEC- TionsWelding Cable Connections Electrical Connections Auxiliary Power ReceptaclesCable Installation Plugs and HAND-HELD EquipmentPremises Wiring Circuit BreakersAtion. do not RUN These BulldogTable of Contents Operation Section Operation Output Panel Controls LimitationsWELDER/GENERATOR Controls Engine Operation Gasoline Engine ControlsBefore Starting the Engine Starting the EngineGenerator Operation Table B.1 Generator Power Applications Welding Operation Control Function / OperationStick Welding Material Thickness Electrode Type Size SettingWelding Guidelines Learning To Stick WeldWhat Happens in the Arc? Correct Welding Position Side viewDo the following PracticeUse the following Butt JointsFillet Joints PenetrationVertical-Up Welding Vertical-Down WeldingWelding Sheet Metal How to Hardface the Sharp Edge Metal to Ground WearOverhead Welding Hardfacing To Reduce WearWelding Cast Iron Cast Iron Plate PreparationOut-of-Position Group AWS E6011 High-Speed Group AWS E6013Low Hydrogen Group AWS E7018 Bulldog Table of Contents Accessories Section Lincoln Electric Accessories AccessoriesOPTIONS/ACCESSORIES Table of Contents Maintenance Section Maintenance Location Routine and Periodic MaintenanceEngine Maintenance Engine Adjustments Return to Section TOC To Section TOCOperational Clearance Table D.1 Engine Maintenance PartsSpark Plug Service GENERATOR/WELDER Maintenance Screws BrushesFigure D.7. Major Component Locations Bulldog 1TABLE of CONTENTS-THEORY of Operation Section E-1 Theory of Operation ENGINE, EXCITATION, Rotor StatorRotor Field Feedback Auxiliary Power Figure E.3 Rotor Field Feedback and Auxiliary PowerAuxiliary Power Overcurrent Protection Weld Winding and Reactor1TABLE of Contents Troubleshooting and Repair F-1 Troubleshooting and Repair HOW to USE Troubleshooting GuidePC Board Troubleshooting Procedures Output Problems Electric Authorized Field Ser vice Facility Perform the Rotor Voltage TestProblems Symptoms Troubleshooting and Repair Perform Field Diode Test Engine Problems Troubleshooting and Repair Engine Throttle Adjustment Test Bulldog Materials Needed Rotor Voltage TestTest Description Lead 200A Connection Ground Stud ProcedureRotor Voltage Test Field Diode Bridge Test Field Diode Bridge Test + ~Rotor Flashing Circuit Test Rotor Flashing Circuit Test Figure F.3 Brush Holder Leads 201- and 202B +Moving Parts can injure Bulldog Rotor Resistance Test Rotor Resistance Test Cable TIE Brushes Figure F.6 Brushes Retained with Cable TIEBulldog Engine Throttle Adjustment Test ROBIN/SUBARU Engine Strobe-tach Method Engine Throttle Adjustment TestROBIN/SUBARU Engine Frequency Counter MethodHigh Speed Stop Screw Scope Settings Normal Open Circuit Voltage Waveform 115VAC Supply High Idle no LoadMachine Loaded to 125 Amps AT 23 VAC Typical Weld Output WaveformMachine Loaded Brush Removal and Replacement Brush Removal and Replacement Cable TIE BrushesReturn to Section Return to Section TOC Bulldog Rheostat Removal and Replacement Rheostat Removal and Replacement Figure F.11 Rheostat RemovalCapacitor AND/OR Diode Bridge Removal and Replacement Capacitor AND/OR Diode Bridge Removal and ReplacementProcedure Capacitor Removal and Replacement Procedure Field Diode Bridge Removal and Replacement Figure F.13 Field Diode Bridge LocationBulldog STATOR/ROTOR Removal and Replacement InstructionsSTATOR/ROTOR Removal and Replacement GeneratorengineFigure F.15 Generator Components Troubleshooting and Repair Stator Removal Procedure Figure F.16 Output Lead Location TIE Wrap TerminalsThru Bolts Support NutsRotor Removal Procedure Reassembly ProcedureFigure F.19 Checking ROTOR-STATOR AIR GAP Engine Output Auxiliary Power Receptacle OUTPUT1Retest After Repair WELDER/GENERATOR OUTPUT1Bulldog Table of Contents Diagram Section Wiring Diagram Bulldog S28101