Lincoln Electric SVM 117-A service manual Removal and REPLACE- Ment Procedure

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F-28	TROUBLESHOOTING & REPAIR	F-28
	TROUBLESHOOTING & REPAIR

CONTROL PC BOARD REMOVAL AND REPLACEMENT (CONTINUED)

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REMOVAL AND REPLACE- MENT PROCEDURE

1.Disconnect main input power the machine.

2.Remove the Case Top and Side Panels using 5/16" nut driver.

3.Disconnect all wiring harness plugs and Molex Plugs connected to the Control Board. See Figure F.9.

4.Remove the eight Phillips Head mounting screws using a Phillips Head screwdriver. See Figure F.10.

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WM-250 CONTROL

G2332

J3

J9

J6

J4J5

J1		J7		J10		J2

FIGURE F.10 - Control Board Mounting Screw Locations may

vary with different Code Machines.

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FIGURE F.9 - Wiring Harness and Molex Plug Locations.

5.Lift the Control Board straight up and out from the machine.

6.Replace all mounting screws and wiring connections when installing the Control Board.

WIRE-MATIC 250

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Contents Safety Depends on You WIRE-MATICARC Welding can be hazardous SafetyCylinder may explode if damaged Iii Electric and MAG- Netic FieldsSûreté Pour Soudage a L’Arc Précautions DE SûretéWIRE-MATIC Table of Contents Table of Contents Installation Current Range Duty Cycle Amps Volts at Rated AmpsFuse Superlag Type 750C CopperSelect Proper Location Safety PrecautionsInput Connections StackingInput Power Connections and Ground Connections Fuse and Wire SizesConnect Shielding GAS Figure A.4 Input Air Supply Connections Reconnect ProcedureFigure A.5 Reconnect Diagram For 208/230/1/60 Machines Install the Work Clamp InstallationConnect Output Components GUN Liner and Contact Output Polarity ConnectionGUN and Cable Installation Wire Size Conversion PartsWIRE-MATIC Operation Safety Instructions General DescriptionWELDING, Cutting Unit Features Design Features AdvantagesPower Source Features Recommended Processes and EquipmentMachine Capability Wire Feeder FeaturesLimitations Duty Cycle Amps VoltsFigure B.1 Operator Controls Controls and SettingsUsing the Wire Drive Roll Procedure for Changing Drive RollLoading the Wire Reel Proper Wire Feeding Feeding ElectrodeTo mount 10 to 30 lb. spools 8 and 12 diameter Setting Idle Roll Pressure Operating StepsStarting the Welder Making a Weld WIRE-MATIC Accessories OPTIONS/ACCESSORIES Installing the K607-1 Spool GUN Adapter KITK607-1 Spool GUN Adapter KIT Spool GUN Module Board InstallationReturn Return to Section TOC Spool GUN Connection BOX InstallationSpool GUN Preparation Spool GUN ConnectionMaking the Weld Making a Weld with the Spool GUN Adapter K607-1 InstalledTimer KIT K585-1 Aluminum Wire Sizes Steel Wire Sizes Part NumberDrive Roll Kits To Make Spot Plug WeldsMaintenance Perform the following daily Routine and Periodic MaintenanceMaintenance Cable Cleaning Contact TIP and GAS Nozzle InstallationDrive Rolls and Guide Tubes GUN Tubes and Nozzles DROP-IN Reel Spindle and ClipsFigure D.2 Liner maintenance Liner Removal ReplacementTo open up the handle GUN Handle DisassemblyDescription English Size Metric Size WIRE-MATIC Theory of Operation Transformer Input Line Voltage and MainFeedback Control Output RectificationFigure E.4 Constant Voltage Output Constant Voltage OutputFeedback Wire Drive MotorThermal Protection Figure E.6 SCR Operation SCR OperationWIRE-MATIC Troubleshooting & Repair Recommended Course of Action HOW to USE Troubleshooting GuidePC Board Troubleshooting Procedures Electric Shock can killBoard can be dam- aged by static electricity Main Transformer Rectifier Assembly Test To Section TOC Perform the SCR Rectifier Perform the Wire Drive Motor Trolyte in these capacitors is Liquid elecPerform the Output Rectifier Main Transformer Test Test DescriptionMaterials Needed ON/OFF Power Switch will be hot during these tests Main Transformer Test Test ProcedureMain Transformer Test Static SCR Rectifier Assembly Test Leads Figure F.4 SCR 1 Test Points Active SCR Rectifier Assembly Test Leads SCR connections Figure F.7 SCR Tester CircuitWire Drive Motor and Tachometer Feedback Test Wire Drive Motor and Tachometer Feedback Test Test Procedure Test for Feedback Voltage to the Control Board Test for Supply Voltage to TachometerNormal Open Circuit Voltage Waveform Scope SettingsTypical Output Voltage Waveform Machine Loaded Machine Loaded to 250 Amps AT 26 VDC Scope SettingsMachine Loaded to 220 Amps AT 22 VDC Scope Settings Troubleshooting & Repair Typical SCR Gate Voltage Waveform Control PC Board Removal and Replacement Removal and Replacement ProcedureMaterials Needed Removal and REPLACE- Ment Procedure Wire Drive Assembly Removal and Replacement Figure F.11 Wire Drive Assembly Removal Wire Drive Assembly Removal and Replacement ProcedureSCR Output Rectifier Removal & Replacement Disconnection Heat Sink Lead Right side heat sink See Figure F.14Capacitor Bank Removal and Replacement Components Bank Removal ReplacementMain Transformer Removal and Replacement Power Switch FAN Motor and FAN Removal and Replacement Figure F.16 Fan Motor and Fan Removal Components FAN Motor and FAN Removal and Replacement ProcedureTroubleshooting & Repair Open Circuit Voltage Wire Speed RangeInput 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