Lincoln Electric SVM103-C service manual Rotor Resistance Test

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F-14	TROUBLESHOOTING & REPAIR	F-14
	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 pre- vent 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 fingernail. 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 assembly 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 8 - 9 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 spec- ifications, then the rotor is okay.

POWER-ARC 4000

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Contents POWER-ARC Safety Depends on YouSafety California Proposition 65 WarningsElectric Shock can kill Welding Sparks can cause fire or explosion Précautions DE Sûreté Master Table of Contents for ALL Sections Table of Contents Installation Section Installation Technical Specifications POWER-ARCStoring Safety PrecautionsLocation and Ventilation PRE-OPERATION Engine Service Spark Arrester Cert. Kool BoreCable Size for Electrical Output ConnectionsWelding Cable Connections 125 ampPlugs and HAND-HELD Equipment Auxiliary Power ReceptaclesMachine Grounding Premises Wiring Circuit BreakersThese Devices Without POWER-ARC Table of Contents Operation Section Operating Instructions Safety InstructionsOperation General DescriptionRecommended Applications Operational Features and ControlsDesign Features Advantages Welding CapabilityControls and Settings GENERATOR/WELDER ControlsGasoline Engine Controls 20 AMP, 120 Volt Duplex ReceptacleStarting the Engine Engine OperationBefore Starting the Engine For a HOT Engine General Information To USE the Generator AS AN Auxiliary Power SupplyGenerator Operation Table B.1 Generator Power Applications Suggested Power Applications Running Watts Start-up WattsWelding Operation Welding Guidelines Table B.2 Welding APPLICATIONS/ELECTRODE Selection GuideOperation What Happens in the Arc? Correct Welding Position Correct Arc Length Do the following PracticeUse the following Butt WeldsFillet Welds PenetrationVertical-Up Welding Vertical-Down WeldingWelding Sheet Metal Overhead WeldingHardfacing To Reduce Wear Welding Cast Iron Cast Iron Plate PreparationLow Hydrogen Group Stable-Arc E7018 High-Speed Group AWS E6013Out-of-Position Group AWS E6011 Table of Contents Accessories Section Lincoln Electric Accessories AccessoriesOPTIONS/ACCESSORIES Table of Contents Maintenance Section Engine Maintenance MaintenanceRoutine and Periodic Maintenance Engine AdjustmentsFigure D.2 Clean Rotating SCREEN/FINGER GUARD/DEBRIS Guard Table D.1 Engine Maintenance Schedule GENERATOR/WELDER Maintenance Do not attempt to polish slip rings while engine is runningFigure 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 Troubleshooting & Repair Section Troubleshooting & Repair HOW to USE Troubleshooting GuideTroubleshooting Output ProblemsVice Facility Or contact your local LincolnElectric Authorized Field Ser Field Service Facility Local Lincoln Electric AuthorizedTroubleshooting Rotor Resistance Test Engine Problems Troubleshooting Engine Throttle Adjustment Test Description This procedure takes approximately 15 minutes to performRotor Voltage Test Materials NeededTest Procedure Rotor Voltage TestThis procedure takes approximately 25 minutes to perform Rotor Resistance TestRotor Resistance Test Figure F.3 Brushes Retained with Cable TIE Engine Throttle Adjustment Test This procedure takes approximately 20 minutes to performOscilloscope Method Strobe-tach MethodFrequency Counter Method Wing NUT High Speed Stop Screw High Idle no Load Scope SettingsNormal Open Circuit Weld Voltage Waveform Normal Open Circuit Voltage Waveform 115 VAC Supply Machine Loaded to 125 Amps AT 23 VAC Typical Weld Output WaveformMachine Loaded Brush Removal and Replacement DescriptionBrush Removal and Replacement ProcedureProcedure Rheostat Removal and Replacement Figure F.7 Rheostat Removal Capacitor AND/OR Diode Bridge Removal and Replacement This procedure takes approximately 35 minutes to performProcedure Capacitor Removal and REPLACE- Ment Figure F.8 Location and Discharging the Field CapacitorProcedure Field Diode Bridge Removal and Replacement Figure F.8A Field Diode Bridge LocationInstructions STATOR/ROTOR Removal and ReplacementThis procedure takes approximately 3 hours to perform STATOR/ROTOR Removal and Replacement Troubleshooting & Repair Rotor Removal Procedure Figure F.12 Checking ROTOR-STATOR AIR GAP Engine Output Auxiliary Power Receptacle OUTPUT1Retest After Repair WELDER/GENERATOR OUTPUT1Return to Section TOC Table of Contents Diagrams Section Diagrams Wiring Diagram Power ARCDIAGRAMSG-3 DIAGRAMSG-4 Dimension Print Power ARC Return to Section TOC SVM Error Reporting Form