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

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F-19

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 division 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 TM4000 Safety POWER-ARCElectric Shock can kill Welding Sparks can cause fire or explosion IiiPrécautions 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 Power ARC Electrical Output ConnectionsWelding Cable Connections Cable Size and LengthAuxiliary Power Receptacles Cable InstallationMachine Grounding Plugs and HAND-HELD EquipmentPremises Wiring Circuit BreakersTable A.2 Electrical Device USE with the POWER-ARC Type Common Electrical Devices Possible ConcernsTable of Contents Operation Section Safety Instructions OperationOperating Instructions General DescriptionOperational Features and Controls Design Features AdvantagesRecommended Applications Welding CapabilityControls and Settings GENERATOR/WELDER ControlsFigure B.2 Gasoline Engine Controls Gasoline Engine ControlsEngine Operation Before Starting the EngineStarting the Engine Stopping the Engine Running the EngineBREAK-IN Period To USE the Generator AS AN Auxiliary Power Supply Generator OperationGeneral Information Table B.3 Generator Power Applications To USE the POWER-ARC 4000 for Welding Welding OperationAfter YOU Finish the Weld Material Thickness Electrode Type Size Setting Welding GuidelinesStick Welding Welding Circuit ARC12/95 POWER-ARC Four Factors of Successful WeldingElectrode Correct WAY to Strike AN ARCCorrect ARC Length Correct Welding SpeedTable of Contents Accessories OPTIONS/ACCESSORIES Lincoln Electric AccessoriesBriggs and Stratton Accessories Table of Contents Maintenance Routine and Periodic Maintenance Engine MaintenanceFigure D.2 Clean Rotating SCREEN/FINGER GUARD/DEBRIS Guard Figure D.4 SET Spark Plug GAP Table D.2 Engine Maintenance Parts GENERATOR/WELDER MaintenancePart Part Number Figure 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 Trouble Shooting & Repair Section Troubleshooting & Repair HOW to USE Troubleshooting GuideTroubleshooting Guide Output ProblemsOr contact your local Lincoln Local Lincoln Electric Authorized Troubleshooting & Repair Troubleshooting & Repair Engine Problems Engine Problems Welding Problems Rotor Voltage Test Test DescriptionMaterials Needed Test Procedure Ground Stud Lead 200A Connection Output PanelRotor Resistance Test Slip RingsFigure F.3 Brushes Retained with Cable TIE Cable TIE BrushesEngine Throttle Adjustment Test Mark Strobe-tach MethodFrequency Counter Method Oscilloscope MethodFigure F.5 Location of Engine Throttle Adjustment NUT NUTScope 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 DescriptionProcedure Figure F.6 Brushes Retained with Cable TIEProcedure Rheostat Removal and Replacement Figure F.7 Rheostat Removal Capacitor AND/OR Diode Bridge Removal Replacement Capacitor AND/OR Diode Bridge Removal and Replacement Procedure Capacitor Removal and ReplacementProcedure Diode Bridge Removal and Replacement STATOR/ROTOR Removal and Replacement InstructionsStator Removal Procedure TIE WrapOutput TerminalsThru Bolts Support Nuts POWER-ARC Figure F.10 Stator END Bracket Support and THRU-BOLTSRotor Removal Procedure Reassembly ProcedureRotor THRU-BOLT Feeler Gauge RotorAuxiliary Power Receptacle OUTPUT1 Retest After RepairEngine Output WELDER/GENERATOR OUTPUT1POWER-ARC Table of Contents Electrical DiagramsSection G Electrical Diagram POWER-ARCPOWER-ARC POWER-ARC