Lincoln Electric SVM114-C Presetting Wire Feed Speed, Setting Constant Wire Feed Speed CV Mode

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B-7

OPERATION

B-7

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screw in the gearbox conductor block and pull the gun cable forward about six inches. There should be a slight waviness in the exposed wire. If there is no waviness, the pressure is too low. Increase the pressure setting 14 turn, lock the gun cable in place and repeat the above steps.

PRESETTING WIRE FEED SPEED

The LN-25™ permits accurate presetting of the desired wire feed speed, before welding, in both CV and CC wire feed modes.

SETTING CONSTANT WIRE FEED SPEED (CV MODE)

a. Set Wire Feed Mode switch to CV position.

b. Set Dial Range switch to LO position for wire feed speeds up to 350 in/min., or HI position for wire feed speeds over 350 in/min.

c. Set Wire Feed dial to the desired wire feed speed on the selected calibrated dial range.

The wire speed will remain constant at the value set, independent of arc voltage changes, as long as the arc voltage does not drop below the value per the chart below for the max. wire feed speed shown:

Maximum Speed

Minimum Arc Volts

350 IPM

15V

400 IPM

17V

500 IPM

21V

600 IPM

24V

700 IPM

27V

SETTING ARC SENSING WIRE FEED SPEED (CC MODE)

When using a constant current (formerly variable voltage) power source, welding performance is im- proved using arc sensing wire feed speed (CC [VV] mode). In this wire feed mode the wire speed increases if arc voltage increases, and decreases if arc voltage decreases, but remains constant at any specific voltage level.

The LN-25™ permits accurate CC mode presetting of the desired wire feed speed, for the desired arc voltage to be used, by setting the Wire Speed dial in the following manner before welding:

a. Set Wire Feed Mode switch to CC position.

FIGURE B.3 – CC WIRE SPEED SETTING.

 

DESIRED

IN/MIN

ARC VOLTS USED

 

700

 

 

 

 

 

 

 

 

 

 

 

 

35

650

 

 

 

 

 

 

 

 

 

 

 

 

 

600

 

 

 

 

 

 

 

 

 

 

 

 

31

 

 

 

 

 

 

 

 

 

 

 

 

 

550

 

 

 

 

 

 

 

 

 

 

 

 

29

 

 

 

 

 

 

 

 

 

 

 

 

 

500

 

 

 

 

 

 

 

 

 

 

 

 

27

 

 

 

 

 

 

 

 

 

 

 

 

 

450

 

 

 

 

 

 

 

 

 

 

 

 

25

 

 

 

 

 

 

 

 

 

 

 

 

 

400

 

 

 

 

 

 

 

 

 

 

 

 

23

 

 

 

 

 

 

 

 

 

 

 

 

 

350

 

 

 

 

 

 

 

 

 

 

 

 

21

 

 

 

 

 

 

 

 

 

 

 

 

 

300

 

 

 

 

 

 

 

 

 

 

 

 

19

 

 

 

 

 

 

 

 

 

 

 

 

 

250

 

 

 

 

 

 

 

 

 

 

 

 

17

 

 

 

 

 

 

 

 

 

 

 

 

 

200

 

 

 

 

 

 

 

 

 

 

 

 

15

 

 

 

 

 

 

 

 

 

 

 

 

 

150

 

 

 

 

 

 

 

 

 

 

 

 

 

100

 

 

 

 

 

 

 

 

 

 

 

 

 

50

100

150

200

250

300

350

400

450

500

550

600

650

700

50

CCWire Speed Setting (Hl or LO Range)

b.Referring to the graph located above the Mode switch (also shown in Figure B.3):

1.Select the horizontal line representing the DE- SIRED IN/MIN. for the welding procedure. (See example arrow line for 375 in/min.)

2.Select the diagonal line representing the ARC VOLTS to be used for the welding procedure. (See example arrow line for 29 volts.)

3.Determine the vertical line representing the CC WIRE SPEED SETTING where the above two lines cross. (See example arrow line for 450.)

c.Set the Wire Speed dial to the value determined in Step (3) above (450 for example used). Use HI Dial Range if value to be set is over 350.

The wire will feed at the DESIRED IN/MIN speed when the welding power source is set to the arc voltage to be used for the weld procedure (375 in/min. at 29V for example used).

A chart representation of the CC wire speed setting graph is shown in Figure B.4, giving the Wire Speed dial setting required for the DESIRED IN/MIN and ARC VOLTS used for the welding procedures:

LN-25™

Image 19
Contents Semiautomatic Wire Feeder California Proposition 65 Warnings SafetyFumes and Gases Electric Shock can killCan be dangerous Cylinder 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 ContentsCurrentrent InstallationTechnical Specifications LN-25 Wire Feed SpeedPower Source Connection Safety PrecautionsFor GMA GUN and Cables INVERTEC, CV300 and Other Newer Lincoln Power SourcesGUN Cable Connection to Feeder With CV AdapterWork Cable Connection Wire Feed Drive Roll and Guide Tube KitsWeld Cable Connection Electrode Cable ConnectionLN-25 Operation Section Welding Capability OperationRead and Understand Entire Section Before Operating Machine LN-25 Instruments Controls Electrode Polarity SwitchWire Feed Mode Switch Wire Speed Dial and Range SwitchRemote ARC Voltage Control Optional GAS Post PRE-FLOW Timers OptionalWork Clip Lead AWGMounting 10 to 30 LB Spools Sequence of OperationLoading Electrode Mounting 22 to 30 LB READI-REELCOILS6OPERATIONB-6 Loading Wire DriveIdle Roll Pressure Setting Grooves READI-REEL Inside Cage WiresMinimum Arc Volts Presetting Wire Feed SpeedSetting Constant Wire Feed Speed CV Mode Setting ARC Sensing Wire Feed Speed CC ModeMaking a Weld Figure B.4 VV CC Wire Speed SettingWelding Procedure AT END of CoilCylinder may explode if damaged Overvoltage Shutdown Circuit Protection and Automatic ShutdownMotor Overload Shutdown Accessories Section C Accessories SectionTable C.1 AccessoriesLN-25 Option Chart How to use Table C.1K434-1 GAS Flow Timer KIT Optional AccessoriesGAS Solenoid KIT K430-2 for Codes LN-25 Contactor KIT K443-1 for Codes K433 Power Source Remote BOXK432 Remote Control Cable Assembly Remote Output Control Options and Control Cable AssembliesK444, K444-1 or K444-2 Remote Voltage Control KIT K439 Remote Extension Cable AssemblyK625, K626, K627 Remote Control Cable Assembly K624-1 42V Remote Output Control ModuleDIA. Hole Connector Must be Insulated in this AreaTo GUN Switch Connect Leads to Pins a and C Style aMaintenance Section Routine Maintenance MaintenanceAdjusting Speed Sensor Module Calibration of LN-25 Wire Speed Dial LN-25 Theory of Operation Section Figure E.1 Theory of Operation Block DiagramControl Circuit Operation Input Power CircuitTheory of Operation General DescriptionTrigger Circuit Feedback and Control CircuitsLater Models Optional CircuitsContactor GAS SolenoidControl PC Board Fuses Protective Devices CircuitsLN-25 Troubleshooting and Repair Section HOW to USE Troubleshooting Guide 2TROUBLESHOOTING and REPAIRF-2PC Board Troubleshooting Procedures Troubleshooting and RepairFeeding Problems Feeding Problems Hall Effect For Codes below 10500 only GAS Solenoid Valve and Solenoid PC Board TestTest Description Materials NeededGAS Solenoid Valve Test ProcedureScrew Wire Reel Retaining Collar Case DoorFigure F.2 Solenoid Leads Troubleshooting and Repair PC Board for K430 GAS Solenoid KIT GAS Solenoid Valve and Solenoid PC Board Test512 624A 621 J11LN-25 For Codes Above 10500 only GAS Solenoid Valve and Control PC Board TestFigure F.5 Control BOX Cover Removal For Codes Above 10500 onlyFigure F.6. Solenoid Leads Solenoid LeadsControl PC Board Solenoid Circuitry Test Figure F.7. Applied Voltage Polarity667 555 691 621 500 512 690 G3425LN-25 Hall Effect Module Test G2196 539 541 500 Hall Effect Module Test539 G1757 Figure F.11 Control PC Board Codes Above LN-25 Wire Drive Motor Test Drive Motor Lead IN-LINE Connector Hall Effect Module Contactor & Contactor PC Board Test Contactor & Contactor PC Board Test Contactor Test ProcedureContactor Coil Leads S20963Contactor PC Board Test 28TROUBLESHOOTING and Repair F-28667 J14 LN-25 Tools Required Contactor PC Board ReplacementRepair Procedure Contactor PC Board Replacement33TROUBLESHOOTING and Repair F-33 Figure F.17 Control PC Board Replacement Figure F.21. Control PC Board Codes 9812 and below Control PC Board ReplacementJ14 Figure F.22. Plug Locations for L12253- Control BoardFigure F.24. Control Board Replacement PC Board Screw For Codes below Contactor ReplacementContactor Replacement 40TROUBLESHOOTING and Repair F-40For Codes Above Figure F.26 Phillips Head Screwdriver Wrench Pliers GAS Solenoid Present ReplacementPurge Switch Leads Solenoid Plug J11 GAS Solenoid Valve AND/OR Solenoid PC Board ifFigure F.29. Solenoid Assembly Wiring Codes 9812 and below Figure F.31. GAS Solenoid Assembly for Earlier Codes Phillips Head Screwdriver Wrench Slot Head Screwdriver Mylar Insulation Electrode Cable 48TROUBLESHOOTING and Repair F-48Drive Motor and Gearbox Replacement and Access to Hall Effect ModuleG1757 Figure F.34. Drive Motor Replacement Retest After Repair LN-25 Table of Contents Electrical Diagrams Section Electrical DiagramsOptional 42 Volt Remote Output Control Wiring Diagram Above Code 11140 G4679Wiring Diagram Code 10556 Thru 10500 L10925 Wiring Diagram Code 10100 Thru 10500 L9644 Wiring Diagram below Code 9900 L7545 LN-25 Across the ARC Model Schematic Complete Machine Codes Above 11140 G5366Schematic Complete Machine below Code 9900 only G1833 Schematic Control PC BD Above Code 11140 G4616-5 Schematic Control PC BD Code 10556 Thru 10558 G3424-3 Schematic Control PC BD Code 10100 Thru 10500 G2194 L12253 PC Board Assembly Control Abovr Code 11140 L12253-3L12253-3 G3425 PC Board Assembly Control Code 10556 Thru 10558 G3425-3PC Board Assembly Control Code 10100 Thru 10500 G2196-1 LN-25 Control PC Board Assembly Control below Code 9900 G1757-6Contactor Schematic Contactor PC BD Above Code 10500 M10965Schematic Contactor PC BD Code 10100 Thru 10500 M17621 Electrical Diagrams Electrical Diagrams L10863 PC Board Assembly Contactor Above Code 10500 L10863-1PC Board Assembly Contactor Code 10100 Thru 10500 L9670-1 PC Board Assembly Contactor below Code 9900 L9185-2