Lincoln Electric SVM132-A service manual Drive Motor Test

Page 71

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F-21	TROUBLESHOOTING AND REPAIR	F-21
	TROUBLESHOOTING AND REPAIR

DRIVE MOTOR TEST (continued)

FIGURE F.5 – DRIVE MOTOR TEST POINTS

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#541

#539

#626

#627

TEST PROCEDURE

1.Remove input power to LN-8.

2.Remove the electrode wire or dis- engage drive rolls.

3.Using the 5/16 in. nutdriver, remove the screws from the left side cover assembly.

4.Lift the left side cover.

5.Locate leads #539 and #541 at the control board. See Figure F.5.

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LN-8

Image 71

Contents LN-8 Semiautomatic Wire Feeder LN-8 SafetyElectric Shock can kill Iii Welding Sparks can cause fire or explosionSûreté Pour Soudage a L’Arc Précautions DE SûretéMaster Table of Contents for ALL Sections Installation LN-8 with K378 Electrode DiameterLN-8 with K303 LN-8 with K377LN-8N and LN-8NE Power Source ConnectionsTable A.1 Work Lead Specifications LN-8S and LN-8SE and Converted LN-8N and LN-8NE Power Source Selection Switch Variable Voltage PC BoardTable A.2 LN-8 Power Source Connection Diagrams Power Source Connection DiagramsSection TOC Installation TOC Figure A.5 Connection of LN-8 to R3S-250 and R3S-325 9A-9Figure A.6 Connection of LN-8 to DC-600 10A-10Power Source To LN-8 Input Cable Plug Control Cable LN-8 for Same Polarity Operation Shock Can Kill LN-8 for Opposite Polarity Operation14A-14 Figure A.10 for Power Sources Other than Lincoln ElectricLN-8NE and LN-8SE Cable Clamp Conductor Electrode Wire Reel BasecontrolInput Cable Connections LN-8N and LN-8SScrew Connections to Wire FeederExtension Tube Connector LockingSELF-TAPPING Screw Hinge Handle Figure A.14 Wire Feeder Handle InstallationGeneral Handling ProceduresGUN and Cable Assemblies LN-8S and LN-8SE Continuous Flux Feed Submerged ARCOperation Gouging Sparks Safety InstructionsControls and Their Functions Constant Current ControlsCurrent Controls Voltage Constant Voltage ControlsAvoiding Ground Lead Protector GLP Activation Circuit ProtectionFigure B.3 Wire Feed Rolls and Guide Tube Installation Wire Feed Rolls and Guide TubesSetting for CV or CC Power Sources Welding with a Constant Voltage Power SourceSlots Coil Reel Mounting a 50 or 60 lb CoilAdapter Wire Reel Loading K1524-1 Universal Wire Reel StandK363-P READI-REEL Adapter READI-REELS a K438 READI-REEL Adapter Must be Used To Mount 10 to 44 lb 4.5 to 20 kg Spools12 in./300 mm Diameter or 14 lb 6 kg Innershield CoilsBrass Blocks Hand Crank ARM Feeding Electrode to the LN-8N or LN-8SFeeding Electrode to the LN-8NE or LN-8SE with Extension Slow Acceleration Starting Code 7926 and Above Flux Tank LoadingAccessories General Table C.1 LN-8 Wire Feeder AccessoriesK58 Magnetic Separator K161 Mechanized Travel Power PackK163 Undercarriage Requires K303, K377, or K378 K178 Mounting PlatformReel Mounting Accessories Constant Current Conversion Parts Welding Guns Welding GUN AccessoriesLN-8 Table of Contents Maintenance Section MaintenanceRoutine Maintenance Periodic Maintenance Theory of Operation Table of Contents Theory of Operation SectionGeneral Description Power Input CircuitsFigure E.2 GUN Trigger and 1CR Contact Control Circuits GUN Trigger and 1CR Relay Contact Control CircuitsFuse Field Applied Later CYCLE, the SCR Output Is Decreased SCR Operation5E-5 LN-8 Troubleshooting and Repair Return to Return to Section TOC HOW to USE Troubleshooting GuidePC Board Troubleshooting Procedures Troubleshooting & RepairProblems Symptoms Troubleshooting GuideFunction Problems Transformer Test Perform the 1CR Relay Test Feeding Problems Welding Problems LN-8 Electrical Sequence of Operation Figure F.1 LN-8 Electrical Sequence of Operation Test Description Trigger Transformer TestTrigger Transformer Test Internal Voltage Test Control Board ConnectorReceptacle Circuit Applied BreakerTable F.1 Voltage Test Points Internal Voltage Test1CR Relay Test 1CR Relay Test Table F.2 Relay Test Terminal Connections 1CR Relay TestDrive Motor Test Drive Motor Test 1CR Figure F.6 GUN Terminal Jumper LocationsTable F.3 Drive Motor Test Points To further check the drive motorPotentiometer Replacement Repair Procedure Circuit Breaker Replacement Retaining NUT Ground Lead Protector Switch Mount Flatwasher Lockwasher NUTGround Lead Protector Push Button Switch Replacement Ground Lead Protector Push Button Trigger Transformer Replacement Insulation Sheet Trigger Transformer NUT Relay PC Board Roundhead ScrewPC Board Replacement Control PC Board Variable Voltage PC Board Relay PC Board Figure F.10 PC Board LocationsRelay Board Removal Control PC Board Replacement Wire Drive Assembly and Component Replacement Blue TWO BlackWhite Green Ground Yellow#568 #567 ShuntGearbox Insulation Sheet Mounting Plate MotorTOC Retest After Repair Electrical Diagrams LN-8N, -8NE, -8S, and -8SE Wiring Diagram Source Power to Work Connection Schematic1CR Wire Feed Motor Field Operating SchematicControl Board L5767 Schematic Variable Voltage Board L5039 Schematic Control Control Board L5767 LayoutVariable Voltage Board L5039 Layout SVM Error Reporting Form