Lincoln Electric SVM 113-A service manual Abnormal Open Circuit Weld Voltage Waveform

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F-34

F-34

TROUBLESHOOTING & REPAIR

ABNORMAL OPEN CIRCUIT WELD VOLTAGE WAVEFORM

HIGH IDLE – NO LOAD – OUTPUT CONTROL AT MAXIMUM

CH1

0 volts

50 volts

5 ms

This is not the typical DC output voltage waveform. Note the “gap” in the waveform. One output diode was disconnected to simulate an “open” diode. Each vertical division repre- sents 50 volts and that each horizon- tal division represents 5 milliseconds in time.

Note: Scope probes connected at machine output terminals.

SCOPE SETTINGS

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

WELDANPOWER 125

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Contents Weldanpowertm Safety California Proposition 65 WarningsElectric Shock can kill Cylinder may explode if damaged Précautions DE Sûreté Master Table of Contents for ALL Sections Table of Contents Installation Section Installation Technical Specifications WeldanpowerSafety Precautions Location and VentilationStoring PRE-OPERATION Engine Service Electrical Output Connections Welding Cable ConnectionsAuxiliary Power Receptacles Machine GroundingPlugs and HAND-HELD Equipment Premises Wiring Circuit BreakersThese Devices Without Table of Contents Operation Section Safety Instructions OperationOperating Instructions General DescriptionOperational Features and Controls Design Features AdvantagesRecommended Applications Welding CapabilityControls and Settings WELDER/GENERATOR ControlsGasoline Engine Controls Figure B.2 Gasoline Engine ControlsEngine Operation Before Starting the EngineStarting the Engine Stopping the Engine For Best Engine StartingWelding Operation BREAK-IN PeriodGeneral Information LOW OIL SensingTo USE the Weldanpower 125 for WELD- ING TIG WeldingTable B.2 Electrode Selection Guide Auxiliary Power To USE the Weldanpower 125 AS AN Auxiliary Power SupplyTable B.3 Generator Power Applications Table of Contents Accessories OPTIONS/ACCESSORIES Lincoln Electric AccessoriesBriggs and Stratton Accessories Table of Contents Maintenance Routine and Periodic Maintenance Engine MaintenanceFigure D.3 Clean Finger Guard MaintanenceFigure D.5 SET Spark Plug GAP WELDER/GENERATOR Maintenance Table D.2 Engine Maintenance PartsFigure D.6 Major Component Locations Table of Contents Theory of Operation Section ENGINE, EXCITATION, Rotor and Stator Idler BoardRotor Field Feedback Auxiliary Power Engine Idle Control Auxiliary Power Overcurrent ProtectionWeld WINDING, Output Rectifier and Choke Figure E.4 Weld WINDING, Output Rectifier and ChokeTable of Contents Trouble Shooting & Repair Section Troubleshooting & Repair HOW to USE Troubleshooting GuidePC Board Troubleshooting Procedures Electric Shock can killTroubleshooting Guide Output ProblemsOutput Rectifier Troubleshooting & Repair Perform the Engine Throttle Engine Problems Main Stator Winding Test Engine Throttle Adjustment Troubleshooting & Repair Weldanpower Rotor Voltage Test Test DescriptionMaterials Needed Test Procedure Rotor Voltage TestRotor Resistance Test Rotor Resistance Test Figure F.3 Brushes Retained with Cable TIE Output Rectifier Bridge Test Output Rectifier Bridge Test Main Stator Test Main Stator Test Figure F.6 Main Stator Molex Plug Test Points Rotor Flashing Circuit Test Rotor Flashing Circuit Test WP125 Idler Engine Throttle Adjustment Test Test Procedure Figure F.12 Idle Speed Adjustment Screw Locations Figure F.13 LOW Idle Adjustment NUT on Idler Solenoid TOC Scope Settings Normal Open Circuit Weld Voltage WaveformHigh Idle no Load Output Control AT Maximum Normal Open Circuit Voltage Waveform 115 VAC Supply Typical Weld Output Waveform Machine LoadedMachine Loaded to 125 Amps AT 25 VAC Abnormal Open Circuit Weld Voltage Waveform Brush Removal and Replacement DescriptionProcedure Figure F.14 Brushes Retained with Cable TIEProcedure Rheostat Removal and Replacement Rheostat Removal and Replacement Field Capacitor Removal and Replacement Field Capacitor Removal and Replacement Field Diode Bridge Removal and Replacement Field Diode Bridge Removal and Replacement Figure F.18 Field Diode Bridge Location Idler Printed Circuit Board Removal Replacement Carefully remove the board Output Rectifier Bridge Removal Replacement Output Rectifier Bridge Removal and Replacement Troubleshooting & Repair Output Choke Removal and Replacement Output Choke Removal and Replacement Section TOC STATOR/ROTOR Removal and Replacement InstructionsStator Removal Procedure Troubleshooting & Repair Rotor Removal Procedure Reassembly ProcedureFigure F.24 Checking ROTOR-STATOR AIR GAP Feeler Gauge Troubleshooting & Repair Auxiliary Power Receptacle OUTPUT1 Retest After RepairEngine Output WELDER/GENERATOR OUTPUT1Weldanpower Table of Contents Diagrams Section Wiring Diagram Code 10158 Diagrams SchematicIdler PC Board M17578 Dimension Print Weldanpower Weldanpower M17578 Idler PC Board M17578-1M17578 Idler PC Board Bill of Materials DescriptionWeldanpower