Choke, To test the stator weld windings | Lincoln Electric SVM150-A

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F-32

F-32

TROUBLESHOOTING & REPAIR

STATOR VOLTAGE TESTS (continued)

FIGURE F.13 – OUTPUT RECTIFIER BRIDGE CONNECTIONS

		TOP	OUTPUT
	W1	CENTER	RECTIFIER
	W2	CENTER	BRIDGE
	W2		BRIDGE
	W3	BOTTOM
			W6
			W7
			W11

W4

W5

W10

	W8	CHOKE
	W9	CHOKE
	W9

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If any one or more of the readings are missing or not within specifications, then check for loose or broken wires between the test points and the sta- tor windings. See the Wiring Diagram. Make sure that the windings are NOT grounded inter- nally to the stator iron. If the leads are intact, then the stator may be faulty. Replace the stator.

If the voltage readings are within specifications, then the windings are good and functioning prop- erly.

7.If finished testing, perform the Case Cover Replacement procedure.

To test the stator weld windings:

1.Locate the weld winding leads connected to the three-phase output rectifier bridge. See Figure F.13.

2.Check for approximately 58 - 65 VAC from W1 to W2. Also check for the same voltage from W2 to W3 and from W1 to W3.

3.If any of these voltages are low or missing, perform the Flashing and Rotor Voltage Test and also the Rotor Resistance Test.

4.If the tests in Step 2 are OK and the stator voltages are low or missing, the stator may be faulty.

5.If finished testing, perform the Case Cover Replacement procedure.

RANGER 250

Image 82

Lincoln Electric SVM150-A service manual Choke, To test the stator weld windings

Contents

Ranger TM Safety Ranger ARC Rays can burn Electric Shock can killFumes and Gases can be dangerous Cylinder may explode if damaged Welding Sparks can cause fire or explosionIii Précautions DE Sûreté Sûreté Pour Soudage a L’Arc Master Table of Contents for ALL Sections Table of Contents Installation Section Weight InstallationTechnical Specifications Ranger 250 K1725-1/K1725-2 Speed RPM Safety Precautions Location and Ventilation Additional Safety Precautions Electrical Output Connections Welding Output Cables Figure A.1 Ranger 250 Output Connections Standby Power Connections Cable InstallationAuxiliary Power Receptacles Cable Cable Size for Amps Length 100% Duty Cycle Figure A.2 Connection of the Ranger 250 to Premises Wiring Table of Contents Operation Section Operation Safety InstructionsOperating Instructions Design Features Controls and Settings Engine Controls Figure B.1 Case Front Panel Controls Before Starting the Engine Engine OperationWelding Controls Check and fill the engine oil level Stopping the Engine Starting the EngineBREAK-IN Period General Information Welder OperationTable B.1 Typical Ranger 250 Fuel Consumption Pipe Welding Stick WeldingConstant Current CC-STICK Welding Table B.2 Typical Current RANGES1 for Tungsten ELECTRODES2 TIG Welding Auxiliary PowerWire WELDING-CV ARC Gouging Simultaneous Welding and Auxiliary Power Loads Table B.4 Ranger 250 Simultaneous Welding and Power Loads Table of Contents Accessories TIG Welding Accessories OPTIONS/ACCESSORIESField Installed Options Semiautomatic Fcaw and MIG Welding Accessories Connection of Lincoln Electric Wire Feeders Accessories Place the Weld Terminals switch Return to Section TOC To Section TOC Accessories Terminals Remotely Controlled Figure C.7 Ranger 250/LN-742 Connection Diagram Connection of the LN-742 to Ranger 250 see Figure C.7 Ranger Table of Contents Maintenance Routine and Periodic Maintenance Engine Maintenance Table D.2 Onan Engine Maintenance Schedule Frequency Maintenance Required Engine OIL Change AIR Cleaner ServiceAir Pre-Cleaner Service Engine Oil Refill Capacities Fuel Filter Service Air Filter Paper Element ServiceSpark Plug Service Engine Adjustment Overspeed is Hazardous Charging the Battery Battery MaintenanceCleaning the Battery Optional Spark Arrestor WELDER/GENERATOR Maintenance Figure D.1 Major Component Locations Table of Contents Theory of Operation Section Theory of Operation General Description Weld WINDINGS, RECTIFIER, Power Module and Feedback Return to Analog Power Board and Control Board Figure E.4 Analog Power Board and Control Board Insulated Gate Bipolar Transistor Igbt Operation Minimum Output Pulse Width ModulationMaximum Output Switch 85VDC Diode Chopper Technology Fundamentals Ranger Table of Contents Troubleshooting & Repair Section Troubleshooting & Repair HOW to USE Troubleshooting Guide PC Board Troubleshooting Procedures PC Board can be damaged by static electricity Observe Safety Guidelines Troubleshooting GuideDetailed in the beginning of this manual Test Stator Voltage Test Engine Function Problems Engine Problems Troubleshooting & Repair Engine Problems Welding Problems Test Description Case Cover Removal and Replacement ProcedureMaterials Needed Removal Procedure Case Cover Removal and Replacement ProcedureReplacement Procedure Power Module Capacitor Discharge Procedure Power Module Capacitor Discharge Procedure Test Procedure Idler Solenoid Test Idler Solenoid Test Figure F.3 Idler Solenoid Leads Engine Throttle Adjustment Test Engine Throttle Adjustment Test Strobe-Tach Method Figure F.5 High Idle Adjustment Frequency Counter Method Oscilloscope Method Vibratach Method Rotor Resistance Test Rotor Resistance Test Figure F.7 Rotor Brush Leads Slip Rings Brushes Flashing and Rotor Voltage Test Oil Pressure Switch Test Flashing and Rotor Voltage Test Figure F.9 Field Diode Rectifier Bridge and Filter Capacitor Stator Voltage Tests To test the 120 VAC winding Stator Voltage TestsTo test the 240 VAC winding Field Rectifier Bridge Retaining TAB Cable Capacitor To test the field winding Figure F.12 14-PIN Amphenol PIN Assignments To test the feeder winding Choke To test the stator weld windings Analog Power PC Board Voltage Test Analog Power PC Board Voltage Test Figure F.14 Analog Power PC Board +15 VDC +20 VDC+5 VDC 15 VDC Output Rectifier Bridge Test Output Rectifier Bridge Test Figure F.15 Plug J41 and Resistor R3 Locations When all tests are complete Other PC board components could be faulty Power Module TestDescription Power Module Test Figure F.17 Power Module Connections Tor terminal on the power module chopper Check Igbt for Shorts Figure F.19 Diode Module Test Heat Sink Terminals Check Diode Module Flywheel Alternator Test Flywheel Alternator Test Figure F.20 Plug J51 PIN Location Normal Open Circuit Voltage Waveform 120VAC Supply Scope SettingsHigh Idle no Load Normal Open Circuit Voltage Waveform Stick MAX Control POT High Idle no Load Normal Weld Voltage Waveform Stick CC Machine Loaded to 250 Amps AT 25 Volts Normal Open Circuit Voltage Waveform Wire CV TAP Normal Weld Voltage Waveform Wire CV Machine Loaded to 250 Amps AT 28 Volts Description Procedure Power Module Assembly Removal and ReplacementRemoval Removal and Replacement Power Module AssemblyReplacement Power Module PC Board Removal and Replacement Figure F.22 Diode MODULE/POWER Module Assembly Details Figure F.23 Diode Module Mounting Details Power Capacitor Removal and Replacement Power Capacitor Removal and Replacement Output Rectifier Bridge and Choke Removal and Replacement Output Rectifier Bridge and Choke Output Rectifier Output Choke ENGINE/STATOR/ROTOR Removal and Replacement ENGINE/STATOR/ROTOR Removal and Replacement Engine Preparation and Lead Disconnection Troubleshooting & Repair Figure F.28 Stator Leads Front Panel Stator Lead Disconnection Figure F.29 ENGINE/STATOR/ROTOR Assembly Removal Engine/Stator/Rotor Assembly Removal Procedure Stator/Rotor Assembly Removal Figure F.30 Stator and Rotor Removal Reassembly Notes Rotor/Stator/Engine Reassembly Lead Reconnection Checklist General Notes on Reassembly Retest After Repair Auxiliary Power OutputVolt Wire Feeder Power Engine Output Electrical Diagrams Table of Contents Electrical Diagrams Section Ranger 250 Kohler Wiring Diagram Wiring Diagram Ranger 250 Kohler Ranger 250 Onan Wiring Diagram Wiring Diagram Ranger 250 Onan 4ELECTRICAL DIAGRAMSG-4 Control INTER-CONNECTION Diagram Schematic Complete Machine Output Terminal Schematic Analog Control Power Supply Schematic Battery Printed Circuit Board Schematic Bypass Printed Circuit Board Schematic Chopper Printed Circuit Board 19462 M Schematic Display Printed Circuit Board 24660S Schematic Weld Control Printed Circuit Board Sheet Electrical Diagrams Electrical Diagrams Electrical Diagrams Electrical Diagrams SVM Error Reporting Form