Lincoln Electric SVM208-A service manual Rotor Field Feedback Auxiliary Power

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E-3	THEORY OF OPERATION	E-3

FIGURE E.3 - ROTOR FIELD FEEDBACK AND AUXILIARY POWER

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ENGINE

MAGNETO

MECHANICAL ROTATION

ROTOR

SLIP

RINGS

CAPACITOR

REACTOR

OUTPUT

TERMINALS

STATOR

ROTOR

STATOR

Return

115 AND 230VAC

RECEPTACLES

RHEOSTATBRIDGE

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ROTOR FIELD FEEDBACK AND

AUXILIARY POWER

The AC voltage developed in the field winding is fed to the full wave bridge. The DC output of the bridge is fil- tered by the field capacitor and controlled by the output rheostat.

This filtered and controlled feedback voltage is fed to the rotor winding via the brush and slip ring configura- tion. As the feedback voltage is increased or de- creased, the outputs of the weld and auxiliary windings are likewise increased or decreased.

When full field voltage is applied to the rotor and the engine is running at high speed (3700 RPM), a 230 VAC voltage is developed in the stator auxiliary wind- ing. This winding is tapped to provide 115 VAC. The two voltages (115 VAC and 230 VAC) are connected to the appropriate receptacles and offer 5500 watts (total) of AC power.

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

BULLDOG® 140

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Contents Bulldog California Proposition 65 Warnings SafetyCan be dangerous Electric Shock can kill ARC Rays can burnIii Welding and Cutting Sparks can cause fire or explosionCylinder may explode if damaged Sûreté Pour Soudage a L’Arc Précautions DE SûretéSafety Methods of Reducing Emissions Mains Supply Master Table of Contents for ALL Sections Table of Contents Installation Section Technical Specifications Bulldog 140 K2708-1 InstallationEngine Exhaust can kill Safety PrecautionsLocation and Ventilation StoringOIL PRE-OPERATION Engine ServiceStacking TiltingTable A.1 Recommended Welding Cable Size and Length Electrical Output CONNEC- TionsWelding Cable Connections Plugs and HAND-HELD Equipment Auxiliary Power ReceptaclesCable Installation Electrical ConnectionsCircuit Breakers Premises WiringBulldog Ation. do not RUN TheseTable of Contents Operation Section Operation Output Panel Controls LimitationsWELDER/GENERATOR Controls Gasoline Engine Controls Engine OperationStarting the Engine Before Starting the EngineGenerator Operation Table B.1 Generator Power Applications Control Function / Operation Welding OperationLearning To Stick Weld Material Thickness Electrode Type Size SettingWelding Guidelines Stick WeldingWhat Happens in the Arc? Side view Correct Welding PositionButt Joints PracticeUse the following Do the followingPenetration Fillet JointsVertical-Down Welding Vertical-Up WeldingHardfacing To Reduce Wear How to Hardface the Sharp Edge Metal to Ground WearOverhead Welding Welding Sheet MetalCast Iron Plate Preparation Welding Cast IronOut-of-Position Group AWS E6011 High-Speed Group AWS E6013Low Hydrogen Group AWS E7018 Bulldog Table of Contents Accessories Section Lincoln Electric Accessories AccessoriesOPTIONS/ACCESSORIES Table of Contents Maintenance Section Maintenance Location Routine and Periodic MaintenanceEngine Maintenance Return to Section TOC To Section TOC Engine AdjustmentsOperational Clearance Table D.1 Engine Maintenance PartsSpark Plug Service Screws Brushes GENERATOR/WELDER MaintenanceFigure D.7. Major Component Locations Bulldog 1TABLE of CONTENTS-THEORY of Operation Section E-1 ENGINE, EXCITATION, Rotor Stator Theory of OperationFigure E.3 Rotor Field Feedback and Auxiliary Power Rotor Field Feedback Auxiliary PowerWeld Winding and Reactor Auxiliary Power Overcurrent Protection1TABLE of Contents Troubleshooting and Repair F-1 HOW to USE Troubleshooting Guide Troubleshooting and RepairPC Board Troubleshooting Procedures Output Problems Perform the Rotor Voltage Test Electric Authorized Field Ser vice FacilityProblems Symptoms Troubleshooting and Repair Perform Field Diode Test Engine Problems Troubleshooting and Repair Engine Throttle Adjustment Test Bulldog Materials Needed Rotor Voltage TestTest Description Lead 200A Connection Ground Stud ProcedureRotor Voltage Test Field Diode Bridge Test + ~ Field Diode Bridge TestRotor Flashing Circuit Test Figure F.3 Brush Holder Leads 201- and 202B + Rotor Flashing Circuit TestMoving Parts can injure Bulldog Rotor Resistance Test Rotor Resistance Test Figure F.6 Brushes Retained with Cable TIE Cable TIE BrushesBulldog Engine Throttle Adjustment Test ROBIN/SUBARU Engine Frequency Counter Method Engine Throttle Adjustment TestROBIN/SUBARU Engine Strobe-tach MethodHigh Speed Stop Screw Scope Settings High Idle no Load Normal Open Circuit Voltage Waveform 115VAC SupplyMachine Loaded to 125 Amps AT 23 VAC Typical Weld Output WaveformMachine Loaded Brush Removal and Replacement Cable TIE Brushes Brush Removal and ReplacementReturn to Section Return to Section TOC Bulldog Rheostat Removal and Replacement Figure F.11 Rheostat Removal Rheostat Removal and ReplacementCapacitor AND/OR Diode Bridge Removal and Replacement Capacitor AND/OR Diode Bridge Removal and ReplacementProcedure Capacitor Removal and Replacement Figure F.13 Field Diode Bridge Location Procedure Field Diode Bridge Removal and ReplacementBulldog Instructions STATOR/ROTOR Removal and ReplacementGeneratorengine STATOR/ROTOR Removal and ReplacementFigure F.15 Generator Components Troubleshooting and Repair Figure F.16 Output Lead Location TIE Wrap Terminals Stator Removal ProcedureNuts Thru Bolts SupportReassembly Procedure Rotor Removal ProcedureFigure F.19 Checking ROTOR-STATOR AIR GAP WELDER/GENERATOR OUTPUT1 Auxiliary Power Receptacle OUTPUT1Retest After Repair Engine OutputBulldog Table of Contents Diagram Section Wiring Diagram Bulldog S28101