Typical Weld Output Waveform | Lincoln Electric SVM208-A specs

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F-30	TROUBLESHOOTING AND REPAIR	F-30

TYPICAL WELD OUTPUT WAVEFORM

MACHINE LOADED

50V

0 volts

20 volts

5ms

MACHINE LOADED TO 125 AMPS AT 23 VAC

This is the typical AC output voltage generated from a properly operating machine. Note that each vertical divi- sion represents 20 volts and that each horizontal division represents 5 milliseconds in time. The machine was loaded with a resistance grid bank.

Note: Scope probes connected at machine output terminals.

SCOPE SETTINGS

Volts/Div	20V/Div.
Horizontal Sweep	5 ms/Div.
Coupling	DC
Trigger	Internal

BULLDOG® 140

Image 78

Lincoln Electric SVM208-A service manual Typical Weld Output Waveform, Machine Loaded to 125 Amps AT 23 VAC

Contents

Bulldog Safety California Proposition 65 Warnings Electric Shock can kill ARC Rays can burn Can be dangerous Welding and Cutting Sparks can cause fire or explosion Cylinder may explode if damagedIii Précautions DE Sûreté Sûreté Pour Soudage a L’Arc Safety Methods of Reducing Emissions Mains Supply Master Table of Contents for ALL Sections Table of Contents Installation Section Installation Technical Specifications Bulldog 140 K2708-1 Storing Safety PrecautionsLocation and Ventilation Engine Exhaust can kill Tilting PRE-OPERATION Engine ServiceStacking OIL Electrical Output CONNEC- Tions Welding Cable ConnectionsTable A.1 Recommended Welding Cable Size and Length Electrical Connections Auxiliary Power ReceptaclesCable Installation Plugs and HAND-HELD Equipment Premises Wiring Circuit Breakers Ation. do not RUN These Bulldog Table of Contents Operation Section Operation Limitations WELDER/GENERATOR ControlsOutput Panel Controls Engine Operation Gasoline Engine Controls Before Starting the Engine Starting the Engine Generator Operation Table B.1 Generator Power Applications Welding Operation Control Function / Operation Stick Welding Material Thickness Electrode Type Size SettingWelding Guidelines Learning To Stick Weld What Happens in the Arc? Correct Welding Position Side view Do the following PracticeUse the following Butt Joints Fillet Joints Penetration Vertical-Up Welding Vertical-Down Welding Welding Sheet Metal How to Hardface the Sharp Edge Metal to Ground WearOverhead Welding Hardfacing To Reduce Wear Welding Cast Iron Cast Iron Plate Preparation High-Speed Group AWS E6013 Low Hydrogen Group AWS E7018Out-of-Position Group AWS E6011 Bulldog Table of Contents Accessories Section Accessories OPTIONS/ACCESSORIESLincoln Electric Accessories Table of Contents Maintenance Section Maintenance Routine and Periodic Maintenance Engine MaintenanceLocation Engine Adjustments Return to Section TOC To Section TOC Table D.1 Engine Maintenance Parts Spark Plug ServiceOperational Clearance GENERATOR/WELDER Maintenance Screws Brushes Figure D.7. Major Component Locations Bulldog 1TABLE of CONTENTS-THEORY of Operation Section E-1 Theory of Operation ENGINE, EXCITATION, Rotor Stator Rotor Field Feedback Auxiliary Power Figure E.3 Rotor Field Feedback and Auxiliary Power Auxiliary Power Overcurrent Protection Weld Winding and Reactor 1TABLE of Contents Troubleshooting and Repair F-1 Troubleshooting and Repair HOW to USE Troubleshooting Guide PC Board Troubleshooting Procedures Output Problems Electric Authorized Field Ser vice Facility Perform the Rotor Voltage Test Problems Symptoms Troubleshooting and Repair Perform Field Diode Test Engine Problems Troubleshooting and Repair Engine Throttle Adjustment Test Bulldog Rotor Voltage Test Test DescriptionMaterials Needed Procedure Rotor Voltage TestLead 200A Connection Ground Stud Field Diode Bridge Test Field Diode Bridge Test + ~ Rotor Flashing Circuit Test Rotor Flashing Circuit Test Figure F.3 Brush Holder Leads 201- and 202B + Moving Parts can injure Bulldog Rotor Resistance Test Rotor Resistance Test Cable TIE Brushes Figure F.6 Brushes Retained with Cable TIE Bulldog Engine Throttle Adjustment Test ROBIN/SUBARU Engine Strobe-tach Method Engine Throttle Adjustment TestROBIN/SUBARU Engine Frequency Counter Method High Speed Stop Screw Scope Settings Normal Open Circuit Voltage Waveform 115VAC Supply High Idle no Load Typical Weld Output Waveform Machine LoadedMachine Loaded to 125 Amps AT 23 VAC Brush Removal and Replacement Brush Removal and Replacement Cable TIE Brushes Return to Section Return to Section TOC Bulldog Rheostat Removal and Replacement Rheostat Removal and Replacement Figure F.11 Rheostat Removal Capacitor AND/OR Diode Bridge Removal and Replacement Removal and Replacement Procedure Capacitor Removal and ReplacementCapacitor AND/OR Diode Bridge Procedure Field Diode Bridge Removal and Replacement Figure F.13 Field Diode Bridge Location Bulldog STATOR/ROTOR Removal and Replacement Instructions STATOR/ROTOR Removal and Replacement Generatorengine Figure F.15 Generator Components Troubleshooting and Repair Stator Removal Procedure Figure F.16 Output Lead Location TIE Wrap Terminals Thru Bolts Support Nuts Rotor Removal Procedure Reassembly Procedure Figure F.19 Checking ROTOR-STATOR AIR GAP Engine Output Auxiliary Power Receptacle OUTPUT1Retest After Repair WELDER/GENERATOR OUTPUT1 Bulldog Table of Contents Diagram Section Wiring Diagram Bulldog S28101