Rotor Resistance Test | Lincoln Electric SVM103-C manual

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F-7		TROUBLESHOOTING		F-7
		TROUBLESHOOTING

	TROUBLESHOOTING GUIDE - Observe all Safety Guidelines detailed throughout this manual

	PROBLEMS	POSSIBLE AREAS OF		RECOMMENDED
	(SYMPTOMS)	MISADJUSTMENTS(S)		COURSE OF ACTION

		OUTPUT PROBLEMS

Low weld output and low auxiliary		1. The generator brushes may be	1.	Perform the Rotor Voltage Test .
output.		worn. See the Maintenance sec-	2.	If the rotor voltage is low, the
		tion of this manual or contact		field capacitor (C1) or bridge (D1)
		your local Lincoln Electric		field capacitor (C1) or bridge (D1)
		your local Lincoln Electric		may be faulty. Test or replace.
		Authorized Field Service Facility.		may be faulty. Test or replace.
		Authorized Field Service Facility.
		2. The engine RPM may be low.	3.	Check the rheostat (R1). Normal
				resistance is 3.3 ohm. See the
				Rheostat Replacement drawing.
			4.	The rotor may be faulty. Perform
				the Rotor Resistance Test .
			5.	The engine RPM may be low.
				Perform the Engine Throttle
				Adjustment Test .
			6.	If engine idle RPM is okay, the
				engine may have lost horsepow-
				er and be in need of major
				repair.

CAUTION

If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, contact the Lincoln Electric Service Department for technical troubleshooting assistance before you proceed. Call 1-800-833-9353

POWER-ARC 4000

Image 55

Lincoln Electric SVM103-C service manual Rotor Resistance Test

Contents

Safety Depends on You POWER-ARC California Proposition 65 Warnings Safety Electric 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 Technical Specifications POWER-ARC Installation Location and Ventilation Safety PrecautionsStoring PRE-OPERATION Engine Service Cert. Kool Bore Spark Arrester 125 amp Electrical Output ConnectionsWelding Cable Connections Cable Size for Machine Grounding Auxiliary Power ReceptaclesPlugs and HAND-HELD Equipment Circuit Breakers Premises Wiring These Devices Without POWER-ARC Table of Contents Operation Section General Description Safety InstructionsOperation Operating Instructions Welding Capability Operational Features and ControlsDesign Features Advantages Recommended Applications GENERATOR/WELDER Controls Controls and Settings 20 AMP, 120 Volt Duplex Receptacle Gasoline Engine Controls Before Starting the Engine Engine OperationStarting the Engine For a HOT Engine Generator Operation To USE the Generator AS AN Auxiliary Power SupplyGeneral Information Suggested Power Applications Running Watts Start-up Watts Table B.1 Generator Power Applications Welding Operation Table B.2 Welding APPLICATIONS/ELECTRODE Selection Guide Welding Guidelines Operation What Happens in the Arc? Correct Welding Position Correct Arc Length Butt Welds PracticeUse the following Do the following Penetration Fillet Welds Vertical-Down Welding Vertical-Up Welding Hardfacing To Reduce Wear Overhead WeldingWelding Sheet Metal Cast Iron Plate Preparation Welding Cast Iron Out-of-Position Group AWS E6011 High-Speed Group AWS E6013Low Hydrogen Group Stable-Arc E7018 Table of Contents Accessories Section OPTIONS/ACCESSORIES AccessoriesLincoln Electric Accessories Table of Contents Maintenance Section Engine Adjustments MaintenanceRoutine and Periodic Maintenance Engine Maintenance Figure D.2 Clean Rotating SCREEN/FINGER GUARD/DEBRIS Guard Table D.1 Engine Maintenance Schedule Do not attempt to polish slip rings while engine is running GENERATOR/WELDER Maintenance Figure D.6. Major Component Locations Table of Contents Theory of Operation Section ENGINE, EXCITATION, Rotor and Stator Theory of Operation Figure E.3 Field Excitation and Auxiliary Power Rotor Field Feedback and Auxiliary Power Weld Winding and Reactor Auxiliary Power Overcurrent Protection Table of Contents Troubleshooting & Repair Section HOW to USE Troubleshooting Guide Troubleshooting & Repair Output Problems Troubleshooting Electric Authorized Field Ser Or contact your local LincolnVice Facility Local Lincoln Electric Authorized Field Service Facility Troubleshooting Rotor Resistance Test Engine Problems Troubleshooting Engine Throttle Adjustment Materials Needed This procedure takes approximately 15 minutes to performRotor Voltage Test Test Description Rotor Voltage Test Test Procedure Rotor Resistance Test This procedure takes approximately 25 minutes to perform Rotor Resistance Test Figure F.3 Brushes Retained with Cable TIE This procedure takes approximately 20 minutes to perform Engine Throttle Adjustment Test Frequency Counter Method Strobe-tach MethodOscilloscope Method Wing NUT High Speed Stop Screw Normal Open Circuit Weld Voltage Waveform Scope SettingsHigh Idle no Load Normal Open Circuit Voltage Waveform 115 VAC Supply Machine Loaded Typical Weld Output WaveformMachine Loaded to 125 Amps AT 23 VAC Description Brush Removal and Replacement Procedure Brush Removal and Replacement Procedure Rheostat Removal and Replacement Figure F.7 Rheostat Removal This procedure takes approximately 35 minutes to perform Capacitor AND/OR Diode Bridge Removal and Replacement Figure F.8 Location and Discharging the Field Capacitor Procedure Capacitor Removal and REPLACE- Ment Figure F.8A Field Diode Bridge Location Procedure Field Diode Bridge Removal and Replacement This procedure takes approximately 3 hours to perform STATOR/ROTOR Removal and ReplacementInstructions STATOR/ROTOR Removal and Replacement Troubleshooting & Repair Rotor Removal Procedure Figure F.12 Checking ROTOR-STATOR AIR GAP WELDER/GENERATOR OUTPUT1 Auxiliary Power Receptacle OUTPUT1Retest After Repair Engine Output Return to Section TOC Table of Contents Diagrams Section Wiring Diagram Power ARC Diagrams DIAGRAMSG-3 DIAGRAMSG-4 Dimension Print Power ARC Return to Section TOC SVM Error Reporting Form