Lincoln Electric SVM 117-A service manual Typical Output Voltage Waveform Machine Loaded

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F-23	TROUBLESHOOTING & REPAIR	F-23
	TROUBLESHOOTING & REPAIR

TYPICAL OUTPUT VOLTAGE WAVEFORM - MACHINE LOADED

MACHINE LOADED TO 250 AMPS AT 26 VDC

SCOPE SETTINGS

This is a typical DC output voltage wave-
form generated from a properly operating	Volts/Div	.20 V/Div.
machine. Note that each vertical division
represents 20 volts and that each horizontal	Horizontal Sweep	.5 ms/Div.
division represents 5 milliseconds in time.
The machine was loaded with a resistance	Coupling	. . . . .DC.
grid bank.
Note: Scope probes connected at machine	Trigger	. .Internal.
Note: Scope probes connected at machine
output terminals: (+) probe to electrode, (-)
probe to work.

WIRE-MATIC 250

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Contents WIRE-MATIC Safety Depends on YouSafety ARC Welding can be hazardousCylinder may explode if damaged Electric and MAG- Netic Fields IiiPrécautions DE Sûreté Sûreté Pour Soudage a L’ArcWIRE-MATIC Table of Contents Table of Contents Installation Duty Cycle Amps Volts at Rated Amps Current RangeFuse Superlag Type 750C CopperSafety Precautions Select Proper LocationInput Connections StackingFuse and Wire Sizes Input Power Connections and Ground ConnectionsConnect Shielding GAS Reconnect Procedure Figure A.4 Input Air Supply ConnectionsFigure A.5 Reconnect Diagram For 208/230/1/60 Machines Installation Install the Work ClampConnect Output Components GUN Liner and Contact Output Polarity ConnectionWire Size Conversion Parts GUN and Cable InstallationWIRE-MATIC Operation General Description Safety InstructionsWELDING, Cutting Design Features Advantages Unit FeaturesPower Source Features Recommended Processes and EquipmentWire Feeder Features Machine CapabilityLimitations Duty Cycle Amps VoltsControls and Settings Figure B.1 Operator ControlsProcedure for Changing Drive Roll Using the Wire Drive RollLoading the Wire Reel Feeding Electrode Proper Wire FeedingTo mount 10 to 30 lb. spools 8 and 12 diameter Operating Steps Setting Idle Roll PressureStarting the Welder Making a Weld WIRE-MATIC Accessories Installing the K607-1 Spool GUN Adapter KIT OPTIONS/ACCESSORIESK607-1 Spool GUN Adapter KIT Installation Spool GUN Module BoardSpool GUN Connection BOX Installation Return Return to Section TOCSpool GUN Connection Spool GUN PreparationMaking a Weld with the Spool GUN Adapter K607-1 Installed Making the WeldTimer KIT K585-1 Steel Wire Sizes Part Number Aluminum Wire SizesDrive Roll Kits To Make Spot Plug WeldsMaintenance Routine and Periodic Maintenance Perform the following dailyMaintenance Contact TIP and GAS Nozzle Installation Cable CleaningDrive Rolls and Guide Tubes GUN Tubes and Nozzles DROP-IN Reel Spindle and ClipsLiner Removal Replacement Figure D.2 Liner maintenanceGUN Handle Disassembly To open up the handleDescription English Size Metric Size WIRE-MATIC Theory of Operation Input Line Voltage and Main TransformerOutput Rectification Feedback ControlConstant Voltage Output Figure E.4 Constant Voltage OutputWire Drive Motor FeedbackThermal Protection SCR Operation Figure E.6 SCR OperationWIRE-MATIC Troubleshooting & Repair HOW to USE Troubleshooting Guide Recommended Course of ActionElectric Shock can kill PC Board Troubleshooting ProceduresBoard can be dam- aged by static electricity Main Transformer Rectifier Assembly Test To Section TOC Perform the SCR Rectifier Perform the Wire Drive Motor Liquid elec Trolyte in these capacitors isPerform the Output Rectifier Test Description Main Transformer TestMaterials Needed Main Transformer Test Test Procedure ON/OFF Power Switch will be hot during these testsMain Transformer Test Static SCR Rectifier Assembly Test Leads Figure F.4 SCR 1 Test Points Active SCR Rectifier Assembly Test Leads Figure F.7 SCR Tester Circuit SCR connectionsWire Drive Motor and Tachometer Feedback Test Wire Drive Motor and Tachometer Feedback Test Test Procedure Test for Supply Voltage to Tachometer Test for Feedback Voltage to the Control BoardScope Settings Normal Open Circuit Voltage WaveformMachine Loaded to 250 Amps AT 26 VDC Scope Settings Typical Output Voltage Waveform Machine LoadedMachine Loaded to 220 Amps AT 22 VDC Scope Settings Troubleshooting & Repair Typical SCR Gate Voltage Waveform Removal and Replacement Procedure Control PC Board Removal and ReplacementMaterials Needed Removal and REPLACE- Ment Procedure Wire Drive Assembly Removal and Replacement Wire Drive Assembly Removal and Replacement Procedure Figure F.11 Wire Drive Assembly RemovalSCR Output Rectifier Removal & Replacement Right side heat sink See Figure F.14 Disconnection Heat Sink LeadCapacitor Bank Removal and Replacement Bank Removal Replacement ComponentsMain Transformer Removal and Replacement Power Switch FAN Motor and FAN Removal and Replacement FAN Motor and FAN Removal and Replacement Procedure Figure F.16 Fan Motor and Fan Removal ComponentsTroubleshooting & Repair Wire Speed Range Open Circuit VoltageInput Volts/Hertz 230/60 375WIRE-MATIC Table of Contents Electrical Diagrams Section WIRE-MATIC Electrical Diagrams Spool GUN Option Wiring Diagram 208/230 Code To Section Available from Lincoln Control PC Board G2332 Layout