Lincoln Electric SVM207-A service manual Abnormal Open Circuit Weld Voltage Waveform CV Mode

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F-33	TROUBLESHOOTING AND REPAIR	F-33
F-33		F-33

ABNORMAL OPEN CIRCUIT WELD VOLTAGE WAVEFORM (CV MODE)

HIGH IDLE - NO LOAD - OUTPUT CONTROL AT MAXIMUM

ONE OUTPUT DIODE NOT FUNCTIONING

CH1

0 volts

20 volts

5 ms

This is NOT the typical CV output volt- age waveform. One output diode is not functioning. Note the “gap” in the waveform. One output diode was dis- connected to simulate an open or non- functioning output diode. Each vertical division represents 20 volts and each horizontal division represents 5 mil- liseconds in time.

Note: Scope probes connected at machine 115VAC receptacle.

SCOPE SETTINGS

Volts/Div	20V/Div.
Horizontal Sweep	5 ms/Div.
Coupling	DC
Trigger	Internal

RANGER® 3 PHASE

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Contents Ranger 3 Phase Ranger 3 Phase SafetyFumes and Gases Welding Cutting Précautions DE Sûreté Safety Methods of Reducing Emissions Mains Supply Master Table of Contents for ALL Sections Table of Contents Installation Section Height Width Depth Weight InstallationTechnical Specifications Ranger 3 Phase K2337-1 & K2337-2 Auxiliary PowerTowing Safety PrecautionsMachine Grounding Spark ArresterCan cause fire or explosion PRE-OPERATION ServiceGasoline Vehicle MountingAngle of Operation Welding Output CablesTotal Combined Length of Electrode and Work Cables High Altitude OperationInstructions 120/240 Volt Dual Voltage Receptacle Auxiliary PowerVolt 3 Phase Receptacle with Ground Gfci Duplex ReceptaclesTABLE A.1 Simultaneous Welding and Power Ground WireStandby Power Connections Auxiliary Power While WeldingFigure A.3 Connection of Ranger 3 Phase to Premises WiringDevices Without Addi Tional Resistive Type Loads Electrical Device USE with the Ranger 3 PhaseUSE These Devices with a Ranger 3 Phase Table of Contents Operation Section Welder Controls Function and Operation Engine SwitchOperation GENERAL DESCRIPTIONControl Dial Polarity SwitchRanger 3 Phase Approximate Fuel Consumption Range SwitchTIG Constant Current Welding Wire Feed Welding Processes Constant VoltageWelding Process Stick Constant Current WeldingStick Auto Stopping the Engine STARTING/SHUTDOWN InstructionsBREAK-IN Period Starting the EngineTable of Contents Accessories Section K1745-1 Welding GAS Cylinder LPG Tank Holder AccessoriesTIG WIRE FEEDRECOMMENDED EQUIPMENT StickRanger 3 Phase Table of Contents Maintenance Section Safety Precautions MaintenanceDo not attempt to polish slip rings while engine is running Gfci Receptacle Testing and RESET- Ting ProcedureAIR Cleaner and Other Maintenance Slip Rings OIL Filter ChangeCHAMPION RC12YC BatteryEngine Maintenance Parts KOHLER C23S Fram CA79Figure D.1 Major Component Location MAINTENANCED-5Ranger 3 Phase 1TABLE of CONTENTS-THEORY of Operation Section E-1 Engine Components and Operation Theory of OperationGeneral Description Figure E.2 ROTOR, Stator and Control Circuits ROTOR, Stator & Control CircuitsFigure E.2 Weld Circuitry Weld Circuitry1TABLE of Contents Troubleshooting and Repair F-1 HOW to USE Troubleshooting Guide Troubleshooting and RepairReturn to Section PC Board Troubleshooting ProceduresDiagram Perform the Output Bridge Test Gram Wiring Wiring Diagram Troubleshooting and Repair Figure F.4 and/or the Wiring Materials Needed Rotor Voltage Test ProcedureTest Description Rotor Voltage Test Test ProcedureRotor Resistance Test Figure F.2 Slip Rings TEST PROCEDUREAuxiliary and Field Winding Test To test the 120 VAC winding To test the 480 VAC 3 Phase windingProbes Reading Auxiliary WindingsField Winding Figure F.4 Control PC BoardRanger 3 Phase Output Rectifier Bridge Test + Meter Lead Meter Reading Figure F.5 OUTPUT RECTIFIERToroid Test Toroid Test Charging Circuit Test Voltage Regulator AC Lead DC Lead Engine Throttle Adjustment Test Engine Throttle Adjustment Test Low Idle Adjustment SolenoidNut Housing Figure F.9 115VAC Supply Waveform High IDLE- no Load High Idle no Load Output Control AT Maximum Scope SettingsNormal Open Circuit Voltage Waveform 115 VAC Supply Machine Loaded Typical DC Weld Output Waveform CV ModeMachine Loaded to 200 Amps AT 26 VDC Typical DC Weld Output Waveform CC ModeMachine Loaded to 225 Amps AT 25 VDC Typical AC Weld Output WaveformAbnormal Open Circuit Weld Voltage Waveform CV Mode Abnormal Open Circuit DC Weld Voltage Waveform Normal Open Circuit Weld Voltage Waveform CV Mode Normal Open Circuit DC Weld Voltage Waveform CC Mode Normal Open Circuit AC Weld Voltage Waveform Ranger 3 Phase Brush Removal and Replacement Procedure Procedure Brush Removal and Replacement ProcedureBrush Assembly Bracket Bolts Ranger 3 Phase Printed Circuit Board Removal Replacement Procedure Figure F.10 Door Removal Printed Circuit Board RemovalOutput Rectifier Bridge Removal Replacement Procedure Figure F.11 OUTPUT RECTIFIER Output Rectifier Bridge RemovalENGINE/ROTOR Removal and Replacement Procedure ENGINE/ROTOR Removal and Replacement Procedure Procedure Figure F.13 Engine and Rotor Removed from Stator Rotor Removal ProcedureReassembly Procedure Retest After Repair Table of Contents Diagram Section RaNGEr 3 phaSE Ranger 3-PHASEL12259 SchEmaTic cOmplETE machiNE l12259ElEcTrical DiaGramS