Lincoln Electric SVM208-A service manual Procedure Field Diode Bridge Removal and Replacement

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F-39

TROUBLESHOOTING AND REPAIR

F-39

 

CAPACITOR AND/OR DIODE BRIDGE

REMOVAL AND REPLACEMENT (continued)

FIGURE F.13 – FIELD DIODE BRIDGE LOCATION

200 (Red)

Feild Diode Bridge

7A

+

 

201

 

 

 

 

 

 

 

 

9A

(Black)

 

 

 

 

 

 

 

 

 

 

 

 

201B

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(Black)

–

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PROCEDURE - FIELD DIODE BRIDGE REMOVAL AND REPLACEMENT

1.Remove the engine spark plug wire.

2.With the 3/8” nut driver, remove the 8 sheet metal screws that hold the top cover to the con- trol box. Remove the top cover.

3.With the 3/8” nut driver and wrench, remove the 6 screws that hold the control panel in place (2 in the front, 2 in the back, 2 in the bottom). Move the panel aside as far as the leads will allow.

4.Discharge the field capacitor by connecting the jumper wire clips on the black and the red wire terminals on the top of the capacitor. See Figure F.13 for location. Leave the clips on for at least 5 seconds, then remove.

5.The field diode bridge (D1) is mounted to the sheet metal just above the capacitor. See Figure F.13. Remove it using the phillips head screw driver.

6.With the needlenose pliers, gently remove the wires from the field diode bridge. Note lead locations.

7.Replace the wires to their appropriate locations on the new diode bridge:

Lead 200 attached to the positive (+) terminal. Depending on the bridge used, this corner may be beveled and/or marked with a + sign.

Lead 201 and 201B  are piggy-backed on the neg- ative (–) terminal, which will always be located diagonally across from the positive (+) terminal.

Leads 9A and 7A are attached to the AC side of the bridge and are attached to the other two corner terminals. Either lead can go on either terminal.

8.Mount the field diode bridge using the screw. Use the slot head screwdriver.

9.Check that the leads are not grounded and for clearance and tightness.

10.Replace the control panel and tighten the sheet metal screws with the 5/16” nut driver and 5/16” wrench.

11.Replace the top cover of the control box and tighten the sheet metal screws with the 3/8” nut driver.

BULLDOG® 140

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Contents Bulldog California Proposition 65 Warnings SafetyCan be dangerous Electric Shock can kill ARC Rays can burnWelding and Cutting Sparks can cause fire or explosion Cylinder may explode if damagedIii 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 TiltingElectrical Output CONNEC- Tions Welding Cable ConnectionsTable A.1 Recommended Welding Cable Size and Length Plugs and HAND-HELD Equipment Auxiliary Power ReceptaclesCable Installation Electrical ConnectionsCircuit Breakers Premises WiringBulldog Ation. do not RUN TheseTable of Contents Operation Section Operation Limitations WELDER/GENERATOR ControlsOutput Panel 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 IronHigh-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 Return to Section TOC To Section TOC Engine AdjustmentsTable D.1 Engine Maintenance Parts Spark Plug ServiceOperational Clearance 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 Rotor Voltage Test Test DescriptionMaterials Needed Procedure Rotor Voltage TestLead 200A Connection Ground Stud 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 SupplyTypical Weld Output Waveform Machine LoadedMachine Loaded to 125 Amps AT 23 VAC 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 Removal and Replacement Procedure Capacitor Removal and ReplacementCapacitor AND/OR Diode Bridge 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
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