DC Exciter Test, Test Description | Lincoln Electric SVM134-A

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F-13

F-13

TROUBLESHOOTING & REPAIR

DC EXCITER TEST

WARNING

Service and repair should be performed by only 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 1-800-833-9353 (WELD).

TEST DESCRIPTION

This test will help determine whether or not the DC exciter is operating correctly. If oper- ation is not correct, the test will also determine what component(s) may be faulty.

MATERIALS NEEDED

3/8" Nut driver Volt/ohmmeter (Multimeter) Wiring Diagram

This procedure takes approximately 30 minutes to perform.

CLASSIC I

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Lincoln Electric SVM134-A service manual DC Exciter Test, Test Description, Materials Needed

Contents

Classic I TM California Proposition 65 Warnings Safety Electric Shock can kill Iii Welding Sparks can cause fire or explosion Sûreté Pour Soudage a L’Arc Précautions DE Sûreté Master Table of Contents for ALL Sections Table of Contents Installation Section Technical Specifications Classic Installation Safety Precautions Location and VentilationStoring PRE-OPERATION Engine Service Muffler Cooling SystemExhaust Spark Arrester Trailers Figure A.1 Ground Stud Location Machine Grounding Electrical Output Connections Auxiliary Power Receptacle PLUGS, and HAND-HELD EquipmentWelding Cable Connections Cable size for combined length Classic Table of Contents Operation Section Safety Instructions OperationOperating Instructions Recommended Applications Operational Features and ControlsWelder Generator WELDER/GENERATOR Controls Controls and Settings Figure B.2 Current Controls Control of Welding Current Return Section TOC Gasoline Engine Controls Engine Operation Before Starting the EngineStarting the Engine Stopping the Engine Cold Weather StartingBREAK-IN Period After you finish welding Welding Operation Table B.1 Range Settings for Wire SIZE/SPEED Auxiliary Power Table of Contents Accessories Semiautomatic Welding Accessories OPTIONS/ACCESSORIES Wire Feed Module see Figure C.1 Connection of Lincoln Electric Wire FeedersConnection of the LN-25 to Classic I Across the ARC with Classic Table of Contents Maintenance Engine Maintenance Safety Precautions Routine and Periodic Maintenance Figure D.1 OIL Drain and Refill MAX MIN Figure D.2A Engine Coolant Drain Plug Gap Specifications 0.032 inch .8 mm After cleaning or when installing a new spark plugSet the terminal gap with a feeler gauge or gapping Tool. See Figure D.4 Classic I charging system is Negative Battery Maintenance Return to Section Return to Section TOC WELDER/GENERATOR Maintenance Idler Maintenance Figure D.5 Major Component Locations Classic Table of Contents Theory of Operation Section BATTERY, STARTER, Engine Alternator and OIL Switch Circuit Theory of OperationGeneral Description ENGINE, Main Generator Armature and Frame and DC Exciter Excitation FlashingMain SHUNT, Interpole and Series Coils Fine Current Adjustment Current Range SelectorEngine Idler Circuit DC Generator Machines Return to Section TOC Table of Contents Troubleshooting & Repair Section HOW to USE Troubleshooting Guide Troubleshooting & Repair PC Board can be damaged by static electricity PC Board Troubleshooting Procedures Troubleshooting Guide Observe Safety GuidelinesDetailed in the beginning of this manual Shunt Field Winding Test Main Generator Throttle Adjustment Test Output Problems Function Problems Troubleshooting & Repair Engine Problems Welding Problems DC Exciter Test Test DescriptionMaterials Needed DC Exciter Test Test Procedure Figure F.2 Exciter Cover Removal Shunt Coil and Series Coil Resistance Tests Small Flex Lead Solid Idler Solenoid Test Troubleshooting & Repair Main Generator Shunt Field Winding Test Main Generator Shunt Field Winding Test Figure F.6 Plug P10 PIN Assignments TAB Engine Throttle Adjustment Test Strobe Tach Method Engine Throttle Adjustment Test Adjust High Idle Engine Throttle Adjustment Test Adjust Low Idle Description Flashing the Fields Flashing the Fields Procedure Figure F.11 Brush HOLDER/BATTERY Jumper Connections Scope Settings Normal Open Circuit Voltage Waveform 115VDC SupplyHigh Idle no Load Fine Current Control Rheostat AT Maximum Normal Open Circuit DC Weld Voltage Waveform Typical DC Weld Voltage Waveform Machine Loaded Selector Switch AT Maximum DC Exciter Armature and Field Coils Removal and Replacement DC Exciter Armature Removal Procedure ReassemblyDC Exciter Armature and Field Coils Perform the DC Exciter Armature Removal Procedure Field Coils Removal Procedure Main Generator Frame Removal and Replacement Replacement Bolt / NUT Main Generator Frame Removal Perform the DC Exciter Armature Removal Lead Figure F.16 Selector Switch Lead Removal Terminal Figure F.18 Choke Control Cable Removal Loosen Here Main Generator Frame Removal Figure F.20 Front Panel Fastener Removal Troubleshooting & Repair Remove Mounting NUTS, Washers Bolts Feet Perform the DC Exciter Armature Reassembly Procedure Main Generator Armature Removal and Replacement Armature is now free to be removed from the engine Main Generator Armature Removal Retest After Repair DC Auxiliary Power Receptacle OutputEngine Output Welder DC Output Electrical Diagrams Section Wiring Diagram Classic Electrical Diagrams Wiring Diagram Wire Feed Module Wire Feed Module Wiring Diagram 16990 M Schematic Idler PC Board Idler PC Board Assembly Idler PC Board