Lincoln Electric SVM167-A service manual Machine Loaded to 180 Amps AT 16 VDC Scope Settings

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F-25

TROUBLESHOOTING AND REPAIR

F-25

ABNORMAL OUTPUT VOLTAGE WAVEFORM - MACHINE

LOADED (MAX TAP “G”)

ONE OUTPUT DIODE NOT FUNCTIONING

0 Volts

20.0 V

5 ms

MACHINE LOADED TO 180 AMPS AT 16 VDC

SCOPE SETTINGS

This is NOT a typical DC output voltage
waveform. One output diode is not func-		Volts/Div	20V/Div
tioning. Note the increased ripple con-
tent. One diode was disconnected to		Horizontal Sweep	5 ms/Div
simulate an open or non-functioning out-
put diode. Each vertical division repre-		Coupling	DC
sents 20 volts and each horizontal divi-
sion represents 5 milliseconds in time.		Trigger	Internal
The machine was loaded with a resis-
tance grid bank.
NOTE: Scope probes	connected at
machine output	terminals: (+)
probe to electrode, (-) probe to
work.

POWER MIG® 215

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Contents Safety Depends on You Power MIGCalifornia Proposition 65 Warnings SafetyCan be dangerous Electric Shock can kill ARC Rays can burnCylinder may explode if damaged Welding and Cutting Sparks can cause fire or explosionIii Sûreté Pour Soudage a L’Arc Précautions DE SûretéMaster Table of Contents for ALL Sections Installation SECTION Table of ContentsTechnical Specifications Power MIG InstallationUncrating the Power MIG Safety PrecautionsInstallation LocationOutput Polarity Connections AUXILIARY POWER RECEPTACLES GUN and Cable InstallationShielding GAS Cylinder may explode if damagedPower MIG Operation SECTION Wear eye, ear and body protec- tion OPERATIONB-2Operation Wire Reel Loading READI-REELS, Spools or Coils Procedure for Changing Drive AND IDLE Roll SetsTo Start the Welder Idle Roll Pressure Setting Feeding Wire ElectrodeWire Drive Configuration Figure B.2b Making a WeldWire Feed Overload Protection Avoiding Wire Feeding ProblemsFAN Control Input Line Voltage VariationsPower MIG Accessories SECTION Accessories Installed 3ACCESSORIESC-3Making a Weld with the Spool GUN Adapter KIT and Spool GUNPower MIG Maintenance SECTION Maintenance Table D.1 Liner Removal and Replace MentEnglish Metric Description Size GUN Handle DisassemblyFigure D.2 Major Component Locations Power MIG Theory of Operation SECTION Line SwitchTheory of Operation Figure E.2 Input Power CircuitFigure E.3 Control Circuits Output Rectification Contactor and Control BoardFigure E.4 Optional Circuits Control BOARD, GUN Trigger and Wire Drive MotorProtective Devices and Circuits Wirefeed Overload ProtectionThermal and Overload Protection Power MIG TROUBLESHOOTING AND REPAIR SECTION How To Use Troubleshooting Guide Troubleshooting and RepairPC Board Troubleshooting Procedures Perform the Main Transformer Perform the Output Contactor Avoid contact with any portion These capacitors is toxicYour body Function Problems Wire Speed Potentiometer Test Welding Problems Weld bead is narrow or ropy Make sure the welding proce Test Description Main Transformer TestMaterials Needed ON/OFF Power Switch will be hot during these tests Test ProcedureMain Transformer Test X10 Input Voltage Test Points Table F.1. Test PointsWire Drive Motor and Wire Speed Potentiometer Test White Black1109 a Test for Feedback Voltage to Control BoardVDC Power MIG Output Bridge Rectifier Test Output Bridge Rectifier Test Negative LeadContactor Test Figure F.7. Contactor Terminals and Leads Contactor TestTypical Output Voltage Waveform Machine Loaded MAX TAP G Volts 10.0Normal Open Circuit Voltage Waveform MAX TAP G Volts 20.0Machine Loaded to 180 Amps AT 16 VDC Scope Settings Volts 20.0 Description Control Board ReplacementProcedure Control Board ReplacementWire Drive Motor Assembly Replacement Wire Drive Motor Assembly Replacement Wire DriveBolt Gas Hose TOC Output Diode Bridge Rectifier Replacement Output Diode Bridge Rectifier Mounting Bracket Mounting Bolts Rectifier Power MIG Output Capacitors Replacement Figure F.14. Capacitor Bank Location Output Capacitors ReplacementLead Mounting Bolts Nuts Lock washers 3 places Power MIG Main Transformer Replacement 41TROUBLESHOOTING and Repair F-41See Figure F.17 Main Transformer ReplacementFigure F.17. Leads X9, X10, 104B,104C, & H1B ReplacementX2 X3 X4 X5 X6 X7 Lead Power MIG FAN BLADE/MOTOR Replacement Perform the Output Capacitor Bank Removal Procedure FAN BLADE/MOTOR ReplacementOutput Contactor Replacement Figure F.24 Output Contactor ReplacementMounting Bolts Retest After Repair Table of Contents Electrical Diagrams Section Electrical DiagramsPOWEr miG Power MIG 215 208/220/230VPower MIG 215 208/220/230V for Codes 11099 L12308 SchEmaTic cOmplETE machiNE cODE 11247 l12308 pG1SchEmaTic cOmplETE machiNE cODE 11247 l12308 pG2 ElEcTrical DiaGramS ElEcTrical DiaGramS ElEcTrical DiaGramS ElEcTrical DiaGramS ElEcTrical DiaGramS ElEcTrical DiaGramS