Lincoln Electric SVM103-A service manual Slip, Rings

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F-13

TROUBLESHOOTING & REPAIR

ROTOR RESISTANCE TEST (continued)

FIGURE F.2

LOCATION OF ROTOR SLIP RINGS - BRUSH HOLDER ASSEMBLY REMOVED

SLIP

RINGS

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TEST PROCEDURE

1.Conduct the test with the gasoline engine OFF.

2.Remove the spark plug wire to prevent accidental engine kickback or starting.

3.Isolate the rotor electrically by removing the generator brushes. Refer to Figure F.2 as you perform the remaining steps.

4.Open the brush holder assembly cover. Squeeze the 2 tabs and depress the cover at the top with a screw driver or your fin- gernail. The cover will drop open on its bottom hinge.

5.With the 1/4” nut driver, remove the 2 screws that hold the brush holder assem- bly in place.

6.Slide the brush holder assembly out and lay it aside, held by the 2 wires attached.

7.Measure the resistance across the rotor slip rings.

A.Set the ohmmeter on the low scale (X1).

B.Place one meter probe on one of the rotor slip rings. Place the other probe on the other slip ring.

C.Check the resistance across the slip rings. It should read 7 - 8 ohms.

8.Measure the resistance to ground.

A..Set the ohmmeter on the high scale (X100,000).

B.Place one probe on either of the slip rings. Place the other probe on any good, unpainted ground. Use the ground stud or the rotor thru-bolt.

C.Check the resistance. It should read very high, at least .5 megohm (500,000 ohms).

If the resistance checks meet the specifica- tions, then the rotor is okay.

POWER-ARC 4000

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Contents POWER-ARC TM4000 Safety POWER-ARCElectric Shock can kill Welding Sparks can cause fire or explosion IiiPrécautions DE Sûreté Master Table of Contents for ALL Sections Table of Contents Installation Section Installation Technical Specifications POWER-ARCSafety Precautions Location and VentilationStoring PRE-OPERATION Engine Service Welding Cable Connections Power ARCElectrical Output Connections Cable Size and LengthMachine Grounding Auxiliary Power ReceptaclesCable Installation Plugs and HAND-HELD EquipmentPremises Wiring Circuit BreakersTable A.2 Electrical Device USE with the POWER-ARC Type Common Electrical Devices Possible ConcernsTable of Contents Operation Section Operating Instructions Safety InstructionsOperation General DescriptionRecommended Applications Operational Features and ControlsDesign Features Advantages Welding CapabilityControls and Settings GENERATOR/WELDER ControlsFigure B.2 Gasoline Engine Controls Gasoline Engine ControlsEngine Operation Before Starting the EngineStarting the Engine Stopping the Engine Running the EngineBREAK-IN Period To USE the Generator AS AN Auxiliary Power Supply Generator OperationGeneral Information Table B.3 Generator Power Applications To USE the POWER-ARC 4000 for Welding Welding OperationAfter YOU Finish the Weld Material Thickness Electrode Type Size Setting Welding GuidelinesStick Welding Welding Circuit ARCElectrode 12/95 POWER-ARCFour Factors of Successful Welding Correct WAY to Strike AN ARCCorrect ARC Length Correct Welding SpeedTable of Contents Accessories OPTIONS/ACCESSORIES Lincoln Electric AccessoriesBriggs and Stratton Accessories Table of Contents Maintenance Routine and Periodic Maintenance Engine MaintenanceFigure D.2 Clean Rotating SCREEN/FINGER GUARD/DEBRIS Guard Figure D.4 SET Spark Plug GAP Table D.2 Engine Maintenance Parts GENERATOR/WELDER MaintenancePart Part Number Figure D.6. Major Component Locations Table of Contents Theory of Operation Section Theory of Operation ENGINE, EXCITATION, Rotor and StatorRotor Field Feedback and Auxiliary Power Figure E.3 Field Excitation and Auxiliary PowerAuxiliary Power Overcurrent Protection Weld Winding and ReactorTable of Contents Trouble Shooting & Repair Section Troubleshooting & Repair HOW to USE Troubleshooting GuideTroubleshooting Guide Output ProblemsOr contact your local Lincoln Local Lincoln Electric Authorized Troubleshooting & Repair Troubleshooting & Repair Engine Problems Engine Problems Welding Problems Rotor Voltage Test Test DescriptionMaterials Needed Test Procedure Ground Stud Lead 200A Connection Output PanelRotor Resistance Test Slip RingsFigure F.3 Brushes Retained with Cable TIE Cable TIE BrushesEngine Throttle Adjustment Test Frequency Counter Method MarkStrobe-tach Method Oscilloscope MethodFigure F.5 Location of Engine Throttle Adjustment NUT NUTScope Settings Normal Open Circuit Weld Voltage WaveformHigh Idle no Load Normal Open Circuit Voltage Waveform 115 VAC Supply Typical Weld Output Waveform Machine LoadedMachine Loaded to 125 Amps AT 23 VAC Brush Removal and Replacement DescriptionProcedure Figure F.6 Brushes Retained with Cable TIEProcedure Rheostat Removal and Replacement Figure F.7 Rheostat Removal Capacitor AND/OR Diode Bridge Removal Replacement Capacitor AND/OR Diode Bridge Removal and Replacement Procedure Capacitor Removal and ReplacementProcedure Diode Bridge Removal and Replacement STATOR/ROTOR Removal and Replacement InstructionsOutput Stator Removal ProcedureTIE Wrap TerminalsThru Bolts Support Nuts POWER-ARC Figure F.10 Stator END Bracket Support and THRU-BOLTSRotor Removal Procedure Reassembly ProcedureRotor THRU-BOLT Feeler Gauge RotorEngine Output Auxiliary Power Receptacle OUTPUT1Retest After Repair WELDER/GENERATOR OUTPUT1POWER-ARC Table of Contents Electrical DiagramsSection G Electrical Diagram POWER-ARCPOWER-ARC POWER-ARC