Lincoln Electric IM901-A manual Wire Feed Speed Validation, Model gearing, Board

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D-2

MAINTENANCE

D-2

 

 

 

The LN-25™ PRO flow meter cannot be calibrated. If the flow meter reads incorrectly, check for leaks or kinks in the gas hose. Replace the flow meter if neces- sary.

Wire Feed Speed Validation

(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

Standard 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.

FIGURE D.1

MOTOR

SHAFT

To change the wire feed speed calibration: (See Figure D.2)

Tools required:

•5/16" nut driver

•RPM meter

•Shorting plug. The shorting plug shorts pins 4 & 8 of connector J3 on the Control P.C. Board. J3 is a 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

Standard 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.

FIGURE D.2

COVER

COVER

P.C. bOARD

LN-25™ PRO ACROSS THE ARC MODEL

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Contents LN-25PRO Safety Depends on YouCalifornia Proposition 65 Warnings SafetyElectric Shock can kill Iii Welding and Cutting Sparks can Cause fire or explosionPrécautions DE Sûreté On-Line Product Registration Please Examine Carton and Equipment For Damage ImmediatelyTAbLE of Contents Installation Location Safety PrecautionsHigh Frequency Protection Weld CAbLE SIzEFunction Pin Wiring 3INSTALLATIONA-3CAbLE Connections Shielding GAS ConnectionChanging the GUN Receiver bUSHING Procedure to Install Drive Rolls and Wire GuidesLoading Spools of Wire Pressure ARM AdjustmentGUN Connection Fe, CrNiFigure A.5 Across the ARC SET-UPSFigure A.7 Figure A.9 8INSTALLATIONA-8Operation Definition of Welding Terms Recommended Power SourcesRecommended Processes Process LimitationsCase Front Controls See Figure b.1 DescriptionAnalog Voltmeter Wire Feed Speed, CV Operation Wire Feed Speed KNObMinimum Arc Volts Maximum WFS Extra TorquePolarity LED Figure b.2 Internal ControlsCV/CC Switch Internal Controls DescriptionCold Feed PUSHbUTTON Figure b-3 Constant Current Wire WeldingRear Controls ItemdescriptionGAS Purge PUSHbUTTON POWER-UP SequenceFlow Meter ScfhFactory Installed Equipment AccessoriesWire Type Drive Roll KitsAccessories Kit Accessories K1500-5 Gun Receiver Bushing compatible Installation of the K590-6 Water Cooling KIT Routine Maintenance MaintenancePeriodic Maintenance CALIbRATION SpecificationTo change the wire feed speed calibration See Figure D.2 Wire Feed Speed ValidationModel gearing BOARDElectric Shock can kill TROUbLESHOOTINGSymptoms PRObLEMSFault Code Description Possible Adjustments POSSIbLEOutput Problems TROUbLESHOOTING Diagrams LN-25 PRO Across the ARCModel Diagrams Dimension Print LN-25 PRO Across the ARC Model Precaucion Warnung
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