Lincoln Electric SVM207-A specification

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F-34	TROUBLESHOOTING AND REPAIR	F-34
F-34		F-34

ABNORMAL OPEN CIRCUIT DC WELD VOLTAGE WAVEFORM

HIGH IDLE - NO LOAD - OUTPUT CONTROL AT MAXIMUM

ONE OUTPUT DIODE NOT FUNCTIONING

CH1

0 volts

50 volts

5 ms

This is NOT the typical DC (+) output voltage waveform. One output diode is not functioning. Note the “gap” in the waveform. One output diode was disconnected to simulate an open or nonfunctioning output diode. Each vertical division represents 50 volts and each horizontal division repre- sents 5 milliseconds in time.

Note: Scope probes connected at machine 115VAC receptacle.

SCOPE SETTINGS

Volts/Div	50V/Div.
Horizontal Sweep	5 ms/Div.
Coupling	DC
Trigger	Internal

RANGER® 3 PHASE

Image 72

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

Contents

Ranger 3 Phase Safety Ranger 3 Phase Fumes 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 Installation Technical Specifications Ranger 3 Phase K2337-1 & K2337-2Auxiliary Power Height Width Depth Weight Safety Precautions Machine GroundingSpark Arrester Towing PRE-OPERATION Service GasolineVehicle Mounting Can cause fire or explosion Welding Output Cables Total Combined Length of Electrode and Work CablesHigh Altitude Operation Angle of Operation Instructions Auxiliary Power Volt 3 Phase Receptacle with GroundGfci Duplex Receptacles 120/240 Volt Dual Voltage Receptacle Ground Wire Standby Power ConnectionsAuxiliary Power While Welding TABLE A.1 Simultaneous Welding and Power Connection of Ranger 3 Phase to Premises Wiring Figure A.3 Electrical Device USE with the Ranger 3 Phase USE These Devices with a Ranger 3 PhaseDevices Without Addi Tional Resistive Type Loads Table of Contents Operation Section Engine Switch OperationGENERAL DESCRIPTION Welder Controls Function and Operation Polarity Switch Ranger 3 Phase Approximate Fuel ConsumptionRange Switch Control Dial Wire Feed Welding Processes Constant Voltage Welding ProcessStick Constant Current Welding TIG Constant Current Welding Stick Auto STARTING/SHUTDOWN Instructions BREAK-IN PeriodStarting the Engine Stopping the Engine Table of Contents Accessories Section Accessories K1745-1 Welding GAS Cylinder LPG Tank Holder WIRE FEED RECOMMENDED EQUIPMENTStick TIG Ranger 3 Phase Table of Contents Maintenance Section Maintenance Safety Precautions Gfci Receptacle Testing and RESET- Ting Procedure AIR Cleaner and Other Maintenance Slip RingsOIL Filter Change Do not attempt to polish slip rings while engine is running Battery Engine Maintenance Parts KOHLER C23SFram CA79 CHAMPION RC12YC MAINTENANCED-5 Figure D.1 Major Component Location Ranger 3 Phase 1TABLE of CONTENTS-THEORY of Operation Section E-1 Theory of Operation General DescriptionEngine Components and Operation ROTOR, Stator & Control Circuits Figure E.2 ROTOR, Stator and Control Circuits Weld Circuitry Figure E.2 Weld Circuitry 1TABLE of Contents Troubleshooting and Repair F-1 Troubleshooting and Repair HOW to USE Troubleshooting Guide PC Board Troubleshooting Procedures Return to Section Diagram Perform the Output Bridge Test Gram Wiring Wiring Diagram Troubleshooting and Repair Figure F.4 and/or the Wiring Rotor Voltage Test Procedure Test DescriptionMaterials Needed Test Procedure Rotor Voltage Test Rotor Resistance Test TEST PROCEDURE Figure F.2 Slip Rings Auxiliary and Field Winding Test To test the 480 VAC 3 Phase winding Probes ReadingAuxiliary Windings To test the 120 VAC winding Figure F.4 Control PC Board Field Winding Ranger 3 Phase Output Rectifier Bridge Test Figure F.5 OUTPUT RECTIFIER + Meter Lead Meter Reading Toroid 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 Scope Settings Normal Open Circuit Voltage Waveform 115 VAC SupplyHigh Idle no Load Output Control AT Maximum Typical DC Weld Output Waveform CV Mode Machine Loaded Typical DC Weld Output Waveform CC Mode Machine Loaded to 200 Amps AT 26 VDC Typical AC Weld Output Waveform Machine Loaded to 225 Amps AT 25 VDC Abnormal 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 Brush Removal and Replacement Procedure Procedure Brush Assembly Bracket Bolts Ranger 3 Phase Printed Circuit Board Removal Replacement Procedure Printed Circuit Board Removal Figure F.10 Door Removal Output Rectifier Bridge Removal Replacement Procedure Output Rectifier Bridge Removal Figure F.11 OUTPUT RECTIFIER ENGINE/ROTOR Removal and Replacement Procedure ENGINE/ROTOR Removal and Replacement Procedure Procedure Rotor Removal Procedure Figure F.13 Engine and Rotor Removed from Stator Reassembly Procedure Retest After Repair Table of Contents Diagram Section Ranger 3-PHASE RaNGEr 3 phaSE SchEmaTic cOmplETE machiNE l12259 L12259 ElEcTrical DiaGramS