Lincoln Electric SVM103-A service manual Theory of Operation, ENGINE, EXCITATION, Rotor and Stator

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E-1

THEORY OF OPERATION

FIGURE E.2 – ENGINE, ROTOR AND STATOR

		REACTOR
		OUTPUT
		TERMINALS
		STATOR
ENGINE	MECHANICAL
	ROTATION
	ROTOR	ROTOR
	SLIP
	RINGS
		STATOR
	CAPACITOR
		115 AND 230VAC
		RECEPTACLES
	RHEOSTAT	BRIDGE
	RHEOSTAT

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ENGINE, EXCITATION, ROTOR AND STATOR

A small DC voltage developed by the flywheel alterna- tor in the Briggs & Stratton engine is fed to the rotat- ing field coil in the rotor via a brush and slip ring con- figuration. This excitation (“flashing”) voltage magnetizes the rotor lamination. The rotor is mechan- ically coupled to the engine. The rotating magnet induces a voltage in the stationary windings of the main alternator (stator).

Three separate and isolated windings are incorporated in the stator lamination assembly. Each winding set has a different number of turns, producing different magnitudes of AC output voltages. The three windings are the weld winding, the auxiliary power winding and the field feedback winding. The field feedback wind- ing provides rotor current during machine operation. The output of the PowerArc 4000 is dependent on two criteria: the engine RPM and the amount of current in the rotor winding.

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NOTE: Unshaded areas of Block Logic Diagram are the subject of discussion.

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-ARCStoring Safety PrecautionsLocation and Ventilation PRE-OPERATION Engine Service Welding Cable Connections Power ARCElectrical Output Connections Cable Size and LengthMachine Grounding Auxiliary Power ReceptaclesCable Installation 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 Operating Instructions Safety InstructionsOperation General DescriptionRecommended Applications Operational Features and ControlsDesign Features Advantages Welding CapabilityControls and Settings GENERATOR/WELDER ControlsFigure B.2 Gasoline Engine Controls Gasoline Engine ControlsStarting the Engine Engine OperationBefore Starting the Engine BREAK-IN Period Stopping the EngineRunning the Engine General Information To USE the Generator AS AN Auxiliary Power SupplyGenerator Operation Table B.3 Generator Power Applications After YOU Finish the Weld To USE the POWER-ARC 4000 for WeldingWelding Operation Stick Welding Material Thickness Electrode Type Size SettingWelding Guidelines Welding Circuit ARCElectrode 12/95 POWER-ARCFour Factors of Successful Welding Correct WAY to Strike AN ARCCorrect ARC Length Correct Welding SpeedTable of Contents Accessories Briggs and Stratton Accessories OPTIONS/ACCESSORIESLincoln Electric 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 Part Part Number Table D.2 Engine Maintenance PartsGENERATOR/WELDER Maintenance 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 Materials Needed Rotor Voltage TestTest Description 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 Frequency Counter Method MarkStrobe-tach Method Oscilloscope MethodFigure F.5 Location of Engine Throttle Adjustment NUT NUTHigh 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 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 InstructionsOutput Stator Removal ProcedureTIE Wrap TerminalsThru Bolts Support Nuts POWER-ARC Figure F.10 Stator END Bracket Support and THRU-BOLTSRotor THRU-BOLT Rotor Removal ProcedureReassembly Procedure Feeler Gauge RotorEngine Output Auxiliary Power Receptacle OUTPUT1Retest After Repair WELDER/GENERATOR OUTPUT1POWER-ARC Section G Table of ContentsElectrical Diagrams Electrical Diagram POWER-ARCPOWER-ARC POWER-ARC