Lincoln Electric SVM208-A manual

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F-37	TROUBLESHOOTING AND REPAIR	F-37

CAPACITOR AND/OR DIODE BRIDGE REMOVAL AND REPLACEMENT

WARNING

Service and repair should be performed only by Lincoln Electric factory trained personnel. Unauthorized repairs performed on this equipment may result in danger to the technician or machine operator and will invalidate your factory warranty. For your safety and to avoid electrical shock, please observe all safety notes and precautions detailed throughout this manual.

If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, contact the Lincoln Electric Service Department for electrical trou- bleshooting assistance before you proceed. Call 1-888-935-3877.

TEST DESCRIPTION

The following procedure will aid the technician in accessing and removing the Capacitor and Diode Bridge for maintenance or replacement of either component.

MATERIALS NEEDED

3/8” Nutdriver

5/16” Nutdriver

Jumper Wire With Alligator Clips On Each End For Discharging The Field Capacitor

Slot Head Screwdriver

Needlenose Pliers

Wiring Diagram

BULLDOG® 140

Image 85

Lincoln Electric SVM208-A service manual Capacitor AND/OR Diode Bridge Removal and Replacement

Contents

Bulldog California Proposition 65 Warnings Safety Can be dangerous Electric Shock can kill ARC Rays can burn Cylinder may explode if damaged Welding and Cutting Sparks can cause fire or explosionIii Sûreté Pour Soudage a L’Arc Précautions DE Sûreté Safety Methods of Reducing Emissions Mains Supply Master Table of Contents for ALL Sections Table of Contents Installation Section Technical Specifications Bulldog 140 K2708-1 Installation Location and Ventilation Safety PrecautionsStoring Engine Exhaust can kill Stacking PRE-OPERATION Engine ServiceTilting OIL Welding Cable Connections Electrical Output CONNEC- TionsTable A.1 Recommended Welding Cable Size and Length Cable Installation Auxiliary Power ReceptaclesElectrical Connections Plugs and HAND-HELD Equipment Circuit Breakers Premises Wiring Bulldog Ation. do not RUN These Table of Contents Operation Section Operation WELDER/GENERATOR Controls LimitationsOutput Panel Controls Gasoline Engine Controls Engine Operation Starting the Engine Before Starting the Engine Generator Operation Table B.1 Generator Power Applications Control Function / Operation Welding Operation Welding Guidelines Material Thickness Electrode Type Size SettingStick Welding Learning To Stick Weld What Happens in the Arc? Side view Correct Welding Position Use the following PracticeDo the following Butt Joints Penetration Fillet Joints Vertical-Down Welding Vertical-Up Welding Overhead Welding How to Hardface the Sharp Edge Metal to Ground WearWelding Sheet Metal Hardfacing To Reduce Wear Cast Iron Plate Preparation Welding Cast Iron Low Hydrogen Group AWS E7018 High-Speed Group AWS E6013Out-of-Position Group AWS E6011 Bulldog Table of Contents Accessories Section OPTIONS/ACCESSORIES AccessoriesLincoln Electric Accessories Table of Contents Maintenance Section Maintenance Engine Maintenance Routine and Periodic MaintenanceLocation Return to Section TOC To Section TOC Engine Adjustments Spark Plug Service Table D.1 Engine Maintenance PartsOperational Clearance Screws Brushes GENERATOR/WELDER Maintenance Figure D.7. Major Component Locations Bulldog 1TABLE of CONTENTS-THEORY of Operation Section E-1 ENGINE, EXCITATION, Rotor Stator Theory of Operation Figure E.3 Rotor Field Feedback and Auxiliary Power Rotor Field Feedback Auxiliary Power Weld Winding and Reactor Auxiliary Power Overcurrent Protection 1TABLE of Contents Troubleshooting and Repair F-1 HOW to USE Troubleshooting Guide Troubleshooting and Repair PC Board Troubleshooting Procedures Output Problems Perform the Rotor Voltage Test Electric Authorized Field Ser vice Facility Problems Symptoms Troubleshooting and Repair Perform Field Diode Test Engine Problems Troubleshooting and Repair Engine Throttle Adjustment Test Bulldog Test Description Rotor Voltage TestMaterials Needed Rotor Voltage Test ProcedureLead 200A Connection Ground Stud Field Diode Bridge Test + ~ Field Diode Bridge Test Rotor Flashing Circuit Test Figure F.3 Brush Holder Leads 201- and 202B + Rotor Flashing Circuit Test Moving Parts can injure Bulldog Rotor Resistance Test Rotor Resistance Test Figure F.6 Brushes Retained with Cable TIE Cable TIE Brushes Bulldog Engine Throttle Adjustment Test ROBIN/SUBARU Engine ROBIN/SUBARU Engine Engine Throttle Adjustment TestStrobe-tach Method Frequency Counter Method High Speed Stop Screw Scope Settings High Idle no Load Normal Open Circuit Voltage Waveform 115VAC Supply Machine Loaded Typical Weld Output WaveformMachine Loaded to 125 Amps AT 23 VAC Brush Removal and Replacement Cable TIE Brushes Brush Removal and Replacement Return to Section Return to Section TOC Bulldog Rheostat Removal and Replacement Figure F.11 Rheostat Removal Rheostat Removal and Replacement Capacitor AND/OR Diode Bridge Removal and Replacement Procedure Capacitor Removal and Replacement Removal and ReplacementCapacitor AND/OR Diode Bridge Figure F.13 Field Diode Bridge Location Procedure Field Diode Bridge Removal and Replacement Bulldog Instructions STATOR/ROTOR Removal and Replacement Generatorengine STATOR/ROTOR Removal and Replacement Figure F.15 Generator Components Troubleshooting and Repair Figure F.16 Output Lead Location TIE Wrap Terminals Stator Removal Procedure Nuts Thru Bolts Support Reassembly Procedure Rotor Removal Procedure Figure F.19 Checking ROTOR-STATOR AIR GAP Retest After Repair Auxiliary Power Receptacle OUTPUT1Engine Output WELDER/GENERATOR OUTPUT1 Bulldog Table of Contents Diagram Section Wiring Diagram Bulldog S28101