MAINTENANCE | ||
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Wire Feed Speed Validation
(See Figure D.1)
Calibration of the LN25 PRO EXTREME 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
•7/16" open end wrench
To verify if calibration is necessary:
1. Turn power OFF. |
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2. | Set the wire feed speed per the table. | ||
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Model gearing | Wire Feed Speed | Acceptable Range | |
Normal Speed | 400 in/min | 69 - 77 rpm | |
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3. | Remove the plastic cover from the lower portion of the | ||
| wire drive with a 7/16" wrench. |
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4. Connect the LN25 PRO EXTREME to the constant voltage DC welding power source. The work lead of the LN25 PRO EXTREME 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.
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 1 & 5 of connector J2 on the p.c. board. J2 is a 6 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
5.Connect the LN25 PRO EXTREME to the constant voltage DC welding power source. The work lead of the LN25 PRO EXTREME must be connected to the work terminal of the power source.
6.Turn power ON.
7.Insert the shorting plug into connector J2 on the p.c. board. The shorting plug shorts pins 1 & 5.
8.Remove the shorting plug.
9.Turn power OFF.
10.Replace the cover and secure with the screws.
FIGURE D.1 | FIGURE D.2 |
COVER
MOTOR 
SHAFT
COVER