Lincoln Electric SVM103-A manual

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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

Image 60

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

Contents

POWER-ARC TM4000 Safety POWER-ARC Electric Shock can kill Welding Sparks can cause fire or explosion Iii Précautions DE Sûreté Master Table of Contents for ALL Sections Table of Contents Installation Section Installation Technical Specifications POWER-ARC Safety Precautions Location and VentilationStoring PRE-OPERATION Engine Service Power ARC Electrical Output ConnectionsWelding Cable Connections Cable Size and Length Auxiliary Power Receptacles Cable InstallationMachine Grounding Plugs and HAND-HELD Equipment Premises Wiring Circuit Breakers Table A.2 Electrical Device USE with the POWER-ARC Type Common Electrical Devices Possible Concerns Table of Contents Operation Section Safety Instructions OperationOperating Instructions General Description Operational Features and Controls Design Features AdvantagesRecommended Applications Welding Capability Controls and Settings GENERATOR/WELDER Controls Figure B.2 Gasoline Engine Controls Gasoline Engine Controls Engine 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 ARC 12/95 POWER-ARC Four Factors of Successful WeldingElectrode Correct WAY to Strike AN ARC Correct ARC Length Correct Welding Speed Table of Contents Accessories OPTIONS/ACCESSORIES Lincoln Electric AccessoriesBriggs and Stratton Accessories Table of Contents Maintenance Routine and Periodic Maintenance Engine Maintenance Figure 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 Stator Rotor Field Feedback and Auxiliary Power Figure E.3 Field Excitation and Auxiliary Power Auxiliary Power Overcurrent Protection Weld Winding and Reactor Table of Contents Trouble Shooting & Repair Section Troubleshooting & Repair HOW to USE Troubleshooting Guide Troubleshooting Guide Output Problems Or 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 Panel Rotor Resistance Test Slip Rings Figure F.3 Brushes Retained with Cable TIE Cable TIE Brushes Engine Throttle Adjustment Test Mark Strobe-tach MethodFrequency Counter Method Oscilloscope Method Figure F.5 Location of Engine Throttle Adjustment NUT NUT Scope 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 Description Procedure Figure F.6 Brushes Retained with Cable TIE Procedure 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 Replacement Procedure Diode Bridge Removal and Replacement STATOR/ROTOR Removal and Replacement Instructions Stator Removal Procedure TIE WrapOutput Terminals Thru Bolts Support Nuts POWER-ARC Figure F.10 Stator END Bracket Support and THRU-BOLTS Rotor Removal Procedure Reassembly ProcedureRotor THRU-BOLT Feeler Gauge Rotor Auxiliary Power Receptacle OUTPUT1 Retest After RepairEngine Output WELDER/GENERATOR OUTPUT1 POWER-ARC Table of Contents Electrical DiagramsSection G Electrical Diagram POWER-ARC POWER-ARC POWER-ARC