Lincoln Electric SVM132-A service manual Welding with a Constant, Voltage Power Source

Page 31

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B-7

OPERATION

B-7

 

 

FIGURE B.4 – CV-CC SWITCH

Volts Control — Idealarc R3S Power Sources

CV-CC￿

Set the power source to the approximate voltage

required, per the R3S instruction manual. Make

SWITCH

final adjustments with the LN–8 ‘Volts’ control (or

 

 

the ‘Fine Voltage Control’ on the optional Line

VARIABLE￿

Voltage Compensator).

 

 

 

VOLTAGE￿

Volts Control — SAM Power Sources

 

PC BOARD

 

Set the power source for the approximate voltage

 

 

required, per the SAM instruction manual. Make

 

final adjustments with the LN-8 ‘Volts’ control.

 

 

If using the variable inductance control (see SAM

 

instruction manual), set the SAM ‘Current

 

Control’ as desired in the 8 o’clock range.

 

 

2. Set the ‘Direction of Wire Feed’ switch so the

 

wire feeds out of the gun.

 

 

3. Adjust the electrical stickout and the actual

 

welding current and voltage as needed.

 

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VARIABLE￿ VOLTAGE￿ PC BOARD

WELDING WITH A CONSTANT CURRENT POWER SOURCE

1.Current and voltage adjustments

Volts Control — All Power Sources

Set the welding voltage with the LN-8 ‘Volts’ control.

Amps Control — CC Power Sources

a.Place mode switch in the CC submerged arc position.

b.Place power source output control toggle switch in the ‘Output Control Remote’ posi- tion. Total current control is now at the LN–8.

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WELDING WITH A CONSTANT

Amps Control — SAM Power Sources

VOLTAGE POWER SOURCE

Set the Current Control on the power source for

 

the approximate current required. Make final

1. Current and voltage adjustments

adjustments with the LN-8 ‘Amps’ control.

Amps Control — All Power Sources

2. Set the ‘Direction of Wire Feed’ switch so the

Set the welding current (or wire feed speed) with

wire feeds out of the gun.

the LN-8 Amps control.

 

 

3. Adjust the welding current and voltage while

Volts Control — DC-600 Power Source

welding as needed.

a.Set the mode switch on the power source to CV Innersheild or CV Subarc, as required.

b.Place power source output control toggle switch in the ‘Output Control Remote’ posi- tion. Total voltage control is now at the LN–8.

LN-8

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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 K377Table A.1 Work Lead Specifications Power Source ConnectionsLN-8N and LN-8NE 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 Controls Avoiding 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 CoilK363-P READI-REEL Adapter Wire Reel Loading K1524-1 Universal Wire Reel StandAdapter 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 CoilsFeeding Electrode to the LN-8NE or LN-8SE with Extension Feeding Electrode to the LN-8N or LN-8SBrass Blocks Hand Crank ARM 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 5E-5 SCR OperationApplied Later CYCLE, the SCR Output Is Decreased 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