Lincoln Electric SVM114-C LN-25 Instruments Controls, Electrode Polarity Switch, Voltmeter

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B-3

 

OPERATION

B-3

LN-25™ INSTRUMENTS AND

NOTE:

 

CONTROLS

 

 

1. The Voltmeter will read zero if the LN-25™ work

 

 

 

Refer to Figure B.1 for control locations.

clip lead is not connected to work, even if the

electrode is electrically “hot” to work.

 

 

 

 

 

FIGURE B.1 – CONTROL LOCATIONS.

2. The Voltmeter will read below zero if the LN-25™

 

 

 

polarity switch is not set to the same polarity as

REMOTE

WIRE SPEED

the electrode.

 

ARC VOLTAGE

DIAL RANGE

3. The Voltmeter will read power source open circuit

CONTROL

SWITCH

(OPTIONAL)

 

 

voltage when the gun trigger is open, even if the

 

 

 

 

 

WIRE

LN-25™ is equipped with the internal contactor.

 

 

 

 

 

 

SPEED

“ELECTRODE POLARITY” SWITCH

 

 

 

DIAL

 

 

 

VOLT

The polarity switch is located on the front panel of the

GAS POST/

 

LN-25™ case.

 

 

METER

 

 

 

 

PRE FLOW

 

 

Set the switch to the same polarity as the electrode

TIMERS

 

 

(OPTIONAL)

 

 

lead connection to the power source. If the switch is

 

 

 

ELECTRODE

 

 

not set for the correct polarity, the wire feeder will not

 

 

operate.

 

POLARITY

 

WORK CLIP

 

 

 

 

SWITCH

 

 

 

 

LEAD

WIRE FEED MODE SWITCH

 

 

 

 

GAS

 

 

 

 

 

 

 

FITTING

 

GUN

 

 

(OPTIONAL)

 

CONNECTION

The CV-VV (CC) Wire Feed Mode switch is located

GUN

 

BLOCK

inside the LN-25™ case. The toggle switch extends

 

 

TRIGGER

 

 

from beneath the control box just above the wire drive.

AMPHENOL

 

 

 

 

CONNECTOR

 

 

The forward “CV” position provides constant wire feed

 

 

 

 

 

 

speed mode for use with constant voltage (CV)

 

 

 

welding power sources.

 

 

 

 

The backward “VV (CC)” position provides arc-sensing

 

 

 

wire feed speed mode for use with constant current

 

 

 

(formerly variable voltage) welding power sources.

 

 

OPTIONAL

 

 

 

 

 

 

 

 

GAS INPUT

WIRE SPEED DIAL AND RANGE SWITCH

 

 

 

 

 

 

 

 

 

FITTING

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Return to

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GAS PURGE BUTTON

The Wire Speed control dial on the front panel of the LN-25™ has two calibrated dial ranges selected by the HI-LO Dial Range switch.

When switched to the LO range position, the constant wire feed speed (CV Wire Feed Mode) is set on the inside (white) dial range calibrated for 50 to 350 in/min.

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ELECTRODE

CABLE

VOLTMETER

(Factory installed on model Codes above 9218)

The 40V DC analog voltmeter is mounted to the front control panel of the LN-25™ and is connected to read the arc voltage between the LN-25™ electrode cable connection and the work clip lead.

When switched to the HI range position, the constant wire feed speed (CV Wire Feed Mode) is set on the outside (black) dial range calibrated for 50 to 700 in/min.

The volts marks around the HI range calibrated dial indicate the minimum arc volts required to obtain the indicated HI range wire feed speeds. For example; if wire speed is set to 400 in/min., a welding procedure arc voltage of at least 17V would be required to obtain the 400 in/min. wire feed speed.

LN-25™

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Contents Semiautomatic Wire Feeder California Proposition 65 Warnings SafetyElectric Shock can kill Fumes and GasesCan be dangerous Welding and Cutting Sparks can Cause fire or explosion Cylinder may explode if damagedIii 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 Operation Welding CapabilityRead 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 SettingProcedure AT END of Coil WeldingCylinder may explode if damaged Circuit Protection and Automatic Shutdown Overvoltage ShutdownMotor Overload Shutdown Accessories Section C Accessories SectionTable C.1 AccessoriesLN-25 Option Chart How to use Table C.1Optional Accessories K434-1 GAS Flow Timer KITGAS 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 Maintenance Routine 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 Hall Effect Module Test G2196 539 541 500539 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 S2096328TROUBLESHOOTING and Repair F-28 Contactor PC Board Test667 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 PC Board Assembly Control Abovr Code 11140 L12253-3 L12253L12253-3 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
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