Lincoln Electric SVM103-C service manual Normal Open Circuit Voltage Waveform 115 VAC Supply

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F-20	TROUBLESHOOTING & REPAIR	F-20
	TROUBLESHOOTING & REPAIR

NORMAL OPEN CIRCUIT VOLTAGE WAVEFORM (115 VAC SUPPLY)

HIGH IDLE – NO LOAD

1 Period = 16.2 ms @ 3700 rpm

CH1

0 volts

20 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 115 VAC receptacle.

SCOPE SETTINGS

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

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-ARCStoring Safety PrecautionsLocation and Ventilation PRE-OPERATION Engine Service Spark Arrester Cert. Kool BoreElectrical Output Connections Welding Cable ConnectionsCable Size for 125 ampPlugs and HAND-HELD Equipment Auxiliary Power ReceptaclesMachine Grounding 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 ReceptacleStarting the Engine Engine OperationBefore Starting the Engine For a HOT Engine General Information To USE the Generator AS AN Auxiliary Power SupplyGenerator Operation 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 WeldingWelding Sheet Metal Overhead WeldingHardfacing To Reduce Wear Welding Cast Iron Cast Iron Plate PreparationLow Hydrogen Group Stable-Arc E7018 High-Speed Group AWS E6013Out-of-Position Group AWS E6011 Table of Contents Accessories Section Lincoln Electric Accessories AccessoriesOPTIONS/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 ProblemsVice Facility Or contact your local LincolnElectric Authorized Field Ser 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 perform Oscilloscope Method Strobe-tach Method Frequency Counter Method Wing NUT High Speed Stop Screw High Idle no Load Scope SettingsNormal Open Circuit Weld Voltage Waveform Normal Open Circuit Voltage Waveform 115 VAC Supply Machine Loaded to 125 Amps AT 23 VAC Typical Weld Output WaveformMachine Loaded 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 LocationInstructions STATOR/ROTOR Removal and ReplacementThis procedure takes approximately 3 hours to perform 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