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Lincoln Electric SVM187-A service manual Exciter Rotor Resistance and Ground Test

Models: SVM187-A

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F-33

TROUBLESHOOTING AND REPAIR

F-33

EXCITER ROTOR RESISTANCE AND GROUND TEST

(Exciter / Auxiliary Power Alternator)

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 1-888-935-3877.

TEST DESCRIPTION

This test will determine if the exciter / auxiliary power alternator rotor winding is open, shorted, or grounded.

MATERIALS NEEDED

Miscellaneous hand tools

Ohmmeter (Analog type meter required for dynamic resistance test.)

Wiring diagram

SAE-400 SEVERE DUTY

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Lincoln Electric SVM187-A service manual Exciter Rotor Resistance and Ground Test, Exciter / Auxiliary Power Alternator

Contents

SAE-400 Severe Duty SAE-400 Severe Duty ISAFETYiElectric Shock can kill SafetyFumes and Gases Can be dangerousFor Electrically Powered equipmentIii Sûreté Pour Soudage a LʼArc Précautions DE SûretéElectromagnetic Compatibility EMC Safety Vii Master Table of Contents for ALL Sections Table of Contents Installation Section Technical Specifications SAE-400 Severe Duty InstallationHeight Width Depth Weight LOCATION/VENTILATION Safety PrecautionsStacking Angle of OperationPRE-OPERATION Engine Service Engine Cooling System Engine BREAK-INWelding Output Cables Spark Arrestor Machine GroundingTable A.1 Combined Length of Electrode Work Cables Table of Contents Operation Section Operation Safety InstructionsOperating Instructions General DescriptionFor Auxiliary Power Design Features and Advantages Duty CycleOther Features For Stick WeldingEngine Controls Auxiliary Power Controls Remote ControlPolarity Switch Welder ControlsCold Weather Starting Engine OperationStarting Instructions Stopping the EngineTypical Fuel Consumption SAE-400 Severe Duty Table of Contents Accessories Section Optional Field Installed Accessories AccessoriesOrder K1690-1 Gfci Receptacle KITTable of Contents Maintenance Section Routine Maintenance MaintenancePeriodic Maintenance Engine OIL ChangeFuel PRE-FILTER/WATER Separator Assembly Bearing MaintenanceCooling System Fuel FiltersWater Separator Element Engine Maintenance ComponentsSecondary Fuel Filter Spark Arrestor Ting ProcedureFor machines with separate spark arresting unit For machines with integral spark arresting muf- flersSAE-400 Severe Duty 1TABLE of CONTENTS-THEORY of Operation Section E-1 Engine Starting and PROTEC- Tion Theory of OperationFigure E.2 Engine Starting and Protection Automatic Engine Idle SystemFlashing EXCITER/AUXILIARY Alternator OperationBuilding output Operation EXCITER/AUXILIARY AlternatorAC Auxiliary Output Excitation and field control OverviewProducing weld current Welding Generator OPERA- TionSeries coils and reactor Reactor AssemblyTion Welding Generator OperaInterpole coils SAE-400 Severe Duty 1TABLE of Contents Troubleshooting and Repair F-1 HOW to USE Troubleshooting Guide 2TROUBLESHOOTING and Repair F-2Locate Problem Symptom Course of ActionPC Board Troubleshooting Procedures Troubleshooting and RepairAdjustment Test Troubleshooting and Repair Possible Areas Misadjustments Problems SymptomsRecommended Course of Action Rocker Adjustment Procedure if necessary Possible Areas of MisadjustmentsTroubleshooting and Repair Adjustment Procedure Welding arc is loud and spatters excessively RPM Adjustment Test System Voltage Tests Protection System Test Perform the Engine Alternator Problems Symptoms Troubleshooting and Repair Low idle RPM may be too low. Perform the Engine Idle Troubleshooting and Repair Troubleshooting and Repair SAE-400 Severe Duty Test Description Engine RPM Adjustment TestMaterials Needed Test Procedure Engine RPM Adjustment TestStrobe-Tach Method Frequency counter method Figure F.2 Engine Components Code 11199High Idle Adjustment Engine RPM Adjustment ProcedureLow idle adjustment Code 10856 only Exciter / Auxiliary Power Alternator Brush and Slip Ring Service ProcedureFigure F.3 Exciter Cover Screw Locations ProcedureBrushes Cleaning slip ringsSeating brushes SAE-400 Severe Duty Test Description Exciter Rotor Voltage TestFigure F.6 Exciter Cover Screw Locations Exciter Rotor Voltage TestFigure F.7 Exciter Rotor Voltage Test Circuit and Ground Test Exciter Rotor Resistance and Ground Test Exciter / Auxiliary Power AlternatorStatic Tests Figure F.9 Slip Ring Locations Dynamic Tests Figure F.10 Slip Ring LocationsEngine not running Flashing Voltage TestFlashing Voltage Test Figure F.13 IDLER/ENGINE Protection PC Board Codes Figure F.14 IDLER/ENGINE Protection PC Board Codes 11199 If battery voltage is detectedTest Description Exciter Stator Short Circuit & Ground TestExciter Stator Short Circuit & Ground Test Welding Generator Brush and Commutator Inspection Service Figure F.15 Generator Cover Screw Locations ServiceBlackened Commutator Normal appearancePitted and Arc Damaged Commutator Welding Generator Brush and Commutator InspectionUneven Commutator appearance Examine the brushesWeld Circuit Ground and Short Circuit Test If the resistance is lower than 500k Ohms Weld circuit ground testShunt Field Coil Resistance and Ground Test Shunt Coil Resistance Test Shunt Field Coil Resistance and Ground TestShunt Coil Ground Test Shunt Field Circuit Voltage Test Shunt Field Circuit Voltage Test Dead SHORT, 1ST STEP, and Open Reactor Tests Min. open Position Rotor Winding Movable ContactsFirst Step Contact Contact Springs Position Insulated FillerRocker Adjustment Procedure Factory set point drill marks Figure F.18 Rocker W/MARKSInitial rocker placement Rocker Adjustment ProcedureCheck for Max output SAE-400 Severe Duty Test Description Output Control Unit Variable Reactor Inspection and Service ProcedureServicing the continuous control unit Figure F.20 Brush & Spring Winding Insulated WedgeSteel Coil Insulator Contacts Chamfered END of Shaft AT this END Figure F.22 Shaft & TubeSAE-400 Severe Duty Test Description Engine Protection System Circuit TestEngine Protection System Circuit Test 66TROUBLESHOOTING and Repair F-66Figure F.24 Engine Alternator Code 11199 &11408 67TROUBLESHOOTING and Repair F-67SAE-400 Severe Duty Engine Alternator Test Troubleshooting and RepairEngine Alternator Test Run/stop switch on#59 #51 SAE-400 Severe Duty Test Description Engine Fuel System Voltage TestsEngine Fuel System Voltage Tests Figure F.28 PC Board Engine Fuel System Voltage TestsFor Codes 11199 Test Description Alternator Rotor Removal and ReplacementRotor Removal Alternator Rotor Removal and ReplacementRotor Replacement SAE-400 Severe Duty Test Description Alternator Stator Removal and ReplacementAlternator Stator Removal and Replacement Figure F.31 Rocker & Mark Locations Alternator Stator Removal and ReplacementReplacing the Exciter Alternator Stator Test Description Generator Frame Removal and ReplacementRemove the generator frame Generator Frame Removal and ReplacementReplacing the Generator Frame Generator Armature Removal and Replacement Removing the Armature Generator Armature Removal and ReplacementReplacing the armature Retest After Repair Table of Contents Diagram Section Electrical Diagrams Wiring Diagram SAE-400 Perkins M20544 M21283 Wiring Diagram Generator Frame M5570 Electrical Diagrams Schematic Complete Machine Code 11199 G4924 Schematic Complete Machine Code 11408 G5827 Section TOC Schematic IDLER/ENGINE Shutdown PC Board Code 10856 L11006-2 PC Board Assembly IDLER/ENGINE Shutdown PC Board L12400-2 Schematic IDLER/ENGINE Shutdown PC Board G4828-2