Lincoln Electric SVM114-C service manual Feeding Problems

Page 43

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F-5

 

TROUBLESHOOTING AND REPAIR

F-5

 

 

 

 

 

 

 

 

 

Troubleshooting Guide – See Wiring Diagrams for location of specified

Observe Safety Guidelines

components. See Wiring Diagrams for troubleshooting of specific circuits.

detailed in the beginning of this manual.

 

 

 

 

 

 

 

PROBLEMS

 

POSSIBLE AREAS OF

 

RECOMMENDED

 

(SYMPTOMS)

 

MISADJUSTMENT(S)

 

COURSE OF ACTION

 

 

 

 

 

 

 

 

 

 

 

FEEDING PROBLEMS (Continued)

 

 

 

The wire feeds for a short period of

1. The drive motor may be

 

1. Check the motor

ar mature

time but then stops feeding. When

overloaded.

Check the wire

 

current through either of the

the gun trigger is released and

feeding path for mechanical

 

armature leads (539 or 541). A

then retriggered, the wire resumes

restrictions.

 

 

typical value is 4 amps DC.

feeding but soon stops again.

2. While welding make certain the

 

2. If 5 amps or less is indicated

 

 

 

 

 

 

 

power source arc voltage is

 

and the armature voltage is

 

 

 

staying above 15 VDC. The

 

being disabled by the control

 

 

 

feeder will not function properly

 

board, then the control board

 

 

 

on less than 15 VDC.

 

may be faulty. Replace.

 

 

 

 

 

 

 

3. If more than 5

amps is

 

 

 

 

 

 

 

indicated, then the motor is

 

 

 

 

 

 

 

drawing too much armature

 

 

 

 

 

 

 

current. Check and or replace

 

 

 

 

 

 

 

the motor brushes.

 

 

 

 

 

 

 

 

4. The motor or gearbox may be

 

 

 

 

 

 

 

faulty. Replace.

 

 

 

 

 

The wire stops or stubs while

1. If the LN-25™ is connected to

 

1. Monitor the motor armature

welding.

 

a constant

current power

 

voltage (leads 539 to 541).

NOTE:On codes above 10100, the

source, the arc voltage may be

 

Normal range is 2 to 23 VDC.

“dipping” below the 15 VDC

 

If the armature voltage is

 

motor leads (541 & 539) are

threshold that is essential for

 

proper, then check or replace

 

in Control Board Connector

proper LN-25™ operation.

 

the motor brushes.

 

 

J4, pins 13 & 14.

 

2. Try connecting the LN-25™ to

 

2. If the motor armature voltage is

 

 

 

 

 

 

 

a constant

voltage power

 

not correct, then the control

 

 

 

source or a flatter slope output.

 

board may be faulty. Replace.

 

 

 

3. Make sure the wire feed mode

 

 

 

 

 

 

switch (S3) is in the correct

 

 

 

 

 

 

position for the power source

 

 

 

 

 

 

being used, and proper speed

 

 

 

 

 

 

setting is used for the

 

 

 

 

 

 

procedure.

 

 

 

 

 

 

 

 

4. Check

for

mechanical

 

 

 

 

 

 

restrictions in the wire feed

 

 

 

 

 

 

path.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CAUTION

If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, contact the Lincoln Electric Service Department for technical troubleshooting assistance before you proceed. Call 1-888-935-3877.

LN-25™

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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
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