Lincoln Electric SVM103-C Normal Open Circuit Weld Voltage Waveform, High Idle no Load

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F-19	TROUBLESHOOTING & REPAIR	F-19
	TROUBLESHOOTING & REPAIR

NORMAL OPEN CIRCUIT WELD VOLTAGE WAVEFORM

HIGH IDLE – NO LOAD

CH1

0 volts

50 volts

5 ms

This is the typical AC output voltage generated from a properly operating machine. Note that each vertical divi- sion represents 50 volts and that each horizontal division represents 5 milliseconds in time.

Note: Scope probes connected at machine output terminals.

SCOPE SETTINGS

Volts/Div	50V/Div.
Horizontal Sweep	5 ms/Div.
Coupling	DC
Trigger	Internal

POWER-ARC 4000

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Contents Safety Depends on You POWER-ARCCalifornia Proposition 65 Warnings SafetyElectric 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 Technical Specifications POWER-ARC InstallationLocation and Ventilation Safety PrecautionsStoring PRE-OPERATION Engine Service Cert. Kool Bore Spark Arrester125 amp Electrical Output ConnectionsWelding Cable Connections Cable Size forMachine Grounding Auxiliary Power ReceptaclesPlugs and HAND-HELD Equipment Circuit Breakers Premises WiringThese Devices Without POWER-ARC Table of Contents Operation Section General Description Safety InstructionsOperation Operating InstructionsWelding Capability Operational Features and ControlsDesign Features Advantages Recommended ApplicationsGENERATOR/WELDER Controls Controls and Settings20 AMP, 120 Volt Duplex Receptacle Gasoline Engine ControlsBefore Starting the Engine Engine OperationStarting the Engine For a HOT Engine Generator Operation To USE the Generator AS AN Auxiliary Power SupplyGeneral Information Suggested Power Applications Running Watts Start-up Watts Table B.1 Generator Power ApplicationsWelding Operation Table B.2 Welding APPLICATIONS/ELECTRODE Selection Guide Welding GuidelinesOperation What Happens in the Arc? Correct Welding Position Correct Arc Length Butt Welds PracticeUse the following Do the followingPenetration Fillet WeldsVertical-Down Welding Vertical-Up WeldingHardfacing To Reduce Wear Overhead WeldingWelding Sheet Metal Cast Iron Plate Preparation Welding Cast IronOut-of-Position Group AWS E6011 High-Speed Group AWS E6013Low Hydrogen Group Stable-Arc E7018 Table of Contents Accessories Section OPTIONS/ACCESSORIES AccessoriesLincoln Electric Accessories Table of Contents Maintenance Section Engine Adjustments MaintenanceRoutine and Periodic Maintenance Engine MaintenanceFigure D.2 Clean Rotating SCREEN/FINGER GUARD/DEBRIS Guard Table D.1 Engine Maintenance Schedule Do not attempt to polish slip rings while engine is running GENERATOR/WELDER MaintenanceFigure D.6. Major Component Locations Table of Contents Theory of Operation Section ENGINE, EXCITATION, Rotor and Stator Theory of OperationFigure E.3 Field Excitation and Auxiliary Power Rotor Field Feedback and Auxiliary PowerWeld Winding and Reactor Auxiliary Power Overcurrent ProtectionTable of Contents Troubleshooting & Repair Section HOW to USE Troubleshooting Guide Troubleshooting & RepairOutput Problems TroubleshootingElectric Authorized Field Ser Or contact your local LincolnVice Facility Local Lincoln Electric Authorized Field Service FacilityTroubleshooting Rotor Resistance Test Engine Problems Troubleshooting Engine Throttle Adjustment Materials Needed This procedure takes approximately 15 minutes to performRotor Voltage Test Test DescriptionRotor Voltage Test Test ProcedureRotor Resistance Test This procedure takes approximately 25 minutes to performRotor Resistance Test Figure F.3 Brushes Retained with Cable TIE This procedure takes approximately 20 minutes to perform Engine Throttle Adjustment TestFrequency Counter Method Strobe-tach MethodOscilloscope Method Wing NUT High Speed Stop Screw Normal Open Circuit Weld Voltage Waveform Scope SettingsHigh Idle no Load Normal Open Circuit Voltage Waveform 115 VAC Supply Machine Loaded Typical Weld Output WaveformMachine Loaded to 125 Amps AT 23 VAC Description Brush Removal and ReplacementProcedure Brush Removal and ReplacementProcedure Rheostat Removal and Replacement Figure F.7 Rheostat Removal This procedure takes approximately 35 minutes to perform Capacitor AND/OR Diode Bridge Removal and ReplacementFigure F.8 Location and Discharging the Field Capacitor Procedure Capacitor Removal and REPLACE- MentFigure F.8A Field Diode Bridge Location Procedure Field Diode Bridge Removal and ReplacementThis procedure takes approximately 3 hours to perform STATOR/ROTOR Removal and ReplacementInstructions STATOR/ROTOR Removal and Replacement Troubleshooting & Repair Rotor Removal Procedure Figure F.12 Checking ROTOR-STATOR AIR GAP WELDER/GENERATOR OUTPUT1 Auxiliary Power Receptacle OUTPUT1Retest After Repair Engine OutputReturn to Section TOC Table of Contents Diagrams Section Wiring Diagram Power ARC DiagramsDIAGRAMSG-3 DIAGRAMSG-4 Dimension Print Power ARC Return to Section TOC SVM Error Reporting Form