Lincoln Electric SVM179-B service manual Wire Feed Speed, Cover, Board

Page 37

D-3	MAINTENANCE	D-3
D-3		D-3

Wire Feed Speed Validation	To change the wire feed speed calibration:

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(See Figure D.1)

Calibration of the LN-25™ PRO may be required when the p.c. board, wire feed speed potentiometer or motor is replaced or serviced. Calibration matches the scale on the name plate to the actual wire feed speed.

Tools required:

•RPM meter

•Constant voltage DC welding power source (DC-400, V-350, CV-400 or equivalent)

•7/16" open end wrench

To verify if calibration is necessary:

1.	Turn power OFF.
2. Set the wire feed speed per the table.

Model gearing		Wire Feed Speed	Acceptable Range
Normal Speed		400 in/min	69 - 77 rpm
Extra Torque		150 in/min	25 - 31 rpm
3.	Remove the plastic cover from the lower portion of the
	wire drive with a 7/16" wrench.
4.	Connect the LN-25™ PRO to the constant voltage DC
	welding power source. The work lead of the LN-25™
	PRO must be connected to the work terminal of the
	power source.
5.	Turn power ON.
6.	Measure the motor rpm when the COLD FEED button
	is pressed.

7. Verify the rpm is within the acceptable range.

(See Figure D.2) Tools required:

•5/16" nut driver

•RPM meter

•Shorting plug. LE CO.part # S18250-982 - The short- ing plug shorts pins 4 & 8 of connector J3 on the Control P.C. Board. J3 is an 8 pin Molex connector.

1.Turn power OFF.

2.Remove the 4 screws holding the rear cover inside the feeder and remove the cover.

3.Open the idle arm.

4.Set the wire feed speed per the table.

Model gearing	Wire Feed Speed
Normal Speed	400 in/min
Extra Torque	150 in/min

5.Connect the LN-25™ PRO to the constant voltage DC welding power source. The work lead of the LN-25™ PRO must be connected to the work terminal of the power source.

6.Turn power ON.

7.Insert the shorting plug into connector J3 on the Control P.C. Board. The shorting plug shorts pins 4 & 8.

8.Remove the shorting plug.

9.Turn power OFF.

10.Replace the cover and secure with the screws.

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FIGURE D.1

FIGURE D.2

COVER

MOTOR

SHAFT

COVER

P.C. BOARD

LN-25™ PRO

Image 37

Contents LN-25PRO Wire Feeder LN-25 PRO SafetyElectric Shock can kill ARC Rays can burn For Electrically Welding CuttingIii Sûreté Pour Soudage a L’Arc Précautions DE SûretéMaster Table of Contents for ALL Sections Table of Contents Installation Section Installation High Frequency Protection Safety PrecautionsLocation ELECTRIC SHOCK can KillCable Connections Wire Drive ConfigurationShielding GAS Connection Changing the GUN Receiver BushingWire Guides Procedure to Install Drive RollsLoading Spools of Wire Pressure ARM AdjustmentGUN Connection Across the ARC SET-UPS Power Source to LN-25 PRO Cable Connection DiagramsDescription Figure A.7 Table of Contents Operation Section Operation Safety PrecautionsGeneral Description Description Wire Feed Speed KnobAnalog Voltmeter Figure B.2 Wire Feed Speed, CC Operation See Figure B.2 orTable B.2 VV CC Wire Speed Setting Figure B-3 Constant Current VS Constant Voltage Wire WeldingWire Feed Speed Range Switch K2613-5 and K2613-7 only PIN GUN Trigger Connector See Figure B.1Work Sense Lead Thermal LED, Motor Overload See Figure B.1Figure B.4 Internal ControlsCV/CC Switch Step Trigger Interlock SwitchInternal Controls Description Cold Feed PushbuttonPreflow Timer Optional PREFLOW, Burnback Postflow Timer KIT K2330-2Figure B.5 Rear ControlsGAS Purge Pushbutton POWER-UP SequenceFlow Meter ScfhLN-25 PRO Table of Contents Accessories Section Factory Installed Equipment AccessoriesWire Type Drive Roll KitsAccessories Accessories K435 Spindle Adapter, for mounting Installation of the K590-6 Water Cooling KIT Table of Contents Maintenance Section Routine Maintenance MaintenancePeriodic Maintenance Calibration SpecificationCover Wire Feed SpeedBoard Figure D.3. Major Component Location Control Board 1TABLE of CONTENTS-THEORY of Operation Section E-1Figure E.2 General Description Theory of OperationTRIGGER CIRCUIT Input PowerFigure E.4 Feedback & Control Circuits Feedback and Control CIR- CuitsFigure E.5 Optional Circuits & Digital Display Board Optional CircuitsLN-25 PRO Table of Contents Troubleshooting & Repair HOW to USE Troubleshooting Guide Troubleshooting & RepairPC Board Troubleshooting Procedures Fault Code Description Possible Adjustment Motor Solenoid Test Possible Areas Misadjustments Problems SymptomsRecommended Course of Action LN-25 PRO Test Description Case Removal ProcedureMaterials Needed Figure F.1 Case Removal ProcedureGAS Solenoid Test GAS Solenoid Control BOX Control BOX Cover Contactor Test Control BOX Contactor Drive Motor and Tach Feedback Test Case Control BOX Assembly Motor Overload Test Figure F.5 Control BOX Assembly Contactor Removal and Replacement Procedure Figure F.6 Control BOX Removal ProcedureFigure F.7 Buss BAR and Mounting Block Replacement ProcedureLN-25 PRO Front Panel Removal and Replacement Procedure Front Panel Troubleshooting & Repair Gas Hose Control BOX Wire Drive Panel Drive Gear Cover LN-25 PRO PC Board Removal and Replacement Procedure Figure F.11 Control PC Board Location PC BOARD Removal and Replacement ProcedureGAS Solenoid Removal and Replacement Procedure GAS Solenoid GAS Hose Control BOX Lock NUT Retest After Repair SET UPRetest a machine Operation VerificationLN-25 PRO Table of Contents Diagram Section Wiring Diagram LN-25 PRO WiriNG DiaGram lN-25 prO CODEs 11507, 11508 G5681-1 Wiring DIAGRAM- LN-25 PRO Analog WiriNG DiaGram lN-25 prO CODEs 11746, 11747 G5681-3 G5683 LN-25 PRO Wire FeederLN-25 PRO Wire Feeder ElECTriCal DiaGrams G5683-1 Pushbutton LN-25 PRO Analog G5683-2G5683 G5683-3 Circuitryconfidential Equipmenttype Xres RXD Work 624 4783-1C0 Flexiblepowerfeede R 50V OF05 Circuitryconfidential S27505-1B0 R2 CW