Lincoln Electric SVM103-C service manual Rotor Voltage Test, Test Procedure

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F-12	TROUBLESHOOTING & REPAIR	F-12
	TROUBLESHOOTING & REPAIR

ROTOR VOLTAGE TEST (continued)

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

GROUND STUD

LEAD 200

CONNECTION

OUTPUT PANEL

TEST PROCEDURE

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1.With the 5/16” nut driver, remove the 4 sheet metal screws that hold the top cover to the control box. Remove the top cover.

2.Start the machine and run it at high idle. Set the output control (rheo- stat) at the MAXIMUM or GENERA- TOR setting.

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

4.Place the positive probe on lead 200 where it connects at the back of the rheostat. See Figure F.1 for loca- tion. Place the negative probe on the machine ground stud or any other good, unpainted ground.

5.Check the voltage reading on the volt/ohmmeter. It should read 45 - 48 VDC.

6.If the voltage is low or not present, the generator field circuit is not functioning correctly. Proceed with the Rotor Resistance Test. C1, R1, or D1 may also be faulty.

7.If rotor voltage is correct, the gener- ator field is okay. Replace the top cover on the control box. Tighten the 4 sheet metal screws with the 5/16” nut driver.

POWER-ARC 4000

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Contents POWER-ARC Safety Depends on YouSafety California Proposition 65 WarningsElectric Shock can kill Welding Sparks can cause fire or explosion Précautions DE Sûreté Master Table of Contents for ALL Sections Table of Contents Installation Section Installation Technical Specifications POWER-ARCSafety Precautions Location and VentilationStoring PRE-OPERATION Engine Service Spark Arrester Cert. Kool BoreElectrical Output Connections Welding Cable ConnectionsCable Size for 125 ampAuxiliary Power Receptacles Machine GroundingPlugs and HAND-HELD Equipment Premises Wiring Circuit BreakersThese Devices Without POWER-ARC Table of Contents Operation Section Safety Instructions OperationOperating Instructions General DescriptionOperational Features and Controls Design Features AdvantagesRecommended Applications Welding CapabilityControls and Settings GENERATOR/WELDER ControlsGasoline Engine Controls 20 AMP, 120 Volt Duplex ReceptacleEngine Operation Before Starting the EngineStarting the Engine For a HOT Engine To USE the Generator AS AN Auxiliary Power Supply Generator OperationGeneral Information Table B.1 Generator Power Applications Suggested Power Applications Running Watts Start-up WattsWelding Operation Welding Guidelines Table B.2 Welding APPLICATIONS/ELECTRODE Selection GuideOperation What Happens in the Arc? Correct Welding Position Correct Arc Length Practice Use the followingDo the following Butt WeldsFillet Welds PenetrationVertical-Up Welding Vertical-Down WeldingOverhead Welding Hardfacing To Reduce WearWelding Sheet Metal Welding Cast Iron Cast Iron Plate PreparationHigh-Speed Group AWS E6013 Out-of-Position Group AWS E6011Low Hydrogen Group Stable-Arc E7018 Table of Contents Accessories Section Accessories OPTIONS/ACCESSORIESLincoln Electric Accessories Table of Contents Maintenance Section Maintenance Routine and Periodic MaintenanceEngine Maintenance Engine AdjustmentsFigure D.2 Clean Rotating SCREEN/FINGER GUARD/DEBRIS Guard Table D.1 Engine Maintenance Schedule GENERATOR/WELDER Maintenance Do not attempt to polish slip rings while engine is runningFigure D.6. Major Component Locations Table of Contents Theory of Operation Section Theory of Operation ENGINE, EXCITATION, Rotor and StatorRotor Field Feedback and Auxiliary Power Figure E.3 Field Excitation and Auxiliary PowerAuxiliary Power Overcurrent Protection Weld Winding and ReactorTable of Contents Troubleshooting & Repair Section Troubleshooting & Repair HOW to USE Troubleshooting GuideTroubleshooting Output ProblemsOr contact your local Lincoln Electric Authorized Field SerVice Facility Field Service Facility Local Lincoln Electric AuthorizedTroubleshooting Rotor Resistance Test Engine Problems Troubleshooting Engine Throttle Adjustment This procedure takes approximately 15 minutes to perform Rotor Voltage TestTest Description Materials NeededTest Procedure Rotor Voltage TestThis procedure takes approximately 25 minutes to perform Rotor Resistance TestRotor Resistance Test Figure F.3 Brushes Retained with Cable TIE Engine Throttle Adjustment Test This procedure takes approximately 20 minutes to performStrobe-tach Method Frequency Counter MethodOscilloscope Method Wing NUT High Speed Stop Screw Scope Settings Normal Open Circuit Weld Voltage WaveformHigh Idle no Load Normal Open Circuit Voltage Waveform 115 VAC Supply Typical Weld Output Waveform Machine LoadedMachine Loaded to 125 Amps AT 23 VAC Brush Removal and Replacement DescriptionBrush Removal and Replacement ProcedureProcedure Rheostat Removal and Replacement Figure F.7 Rheostat Removal Capacitor AND/OR Diode Bridge Removal and Replacement This procedure takes approximately 35 minutes to performProcedure Capacitor Removal and REPLACE- Ment Figure F.8 Location and Discharging the Field CapacitorProcedure Field Diode Bridge Removal and Replacement Figure F.8A Field Diode Bridge LocationSTATOR/ROTOR Removal and Replacement This procedure takes approximately 3 hours to performInstructions STATOR/ROTOR Removal and Replacement Troubleshooting & Repair Rotor Removal Procedure Figure F.12 Checking ROTOR-STATOR AIR GAP Auxiliary Power Receptacle OUTPUT1 Retest After RepairEngine Output WELDER/GENERATOR OUTPUT1Return to Section TOC Table of Contents Diagrams Section Diagrams Wiring Diagram Power ARCDIAGRAMSG-3 DIAGRAMSG-4 Dimension Print Power ARC Return to Section TOC SVM Error Reporting Form