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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
Extra Torque
150 in/min
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
COVER
MAINTENANCE
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
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
5. Connect the LN-25™ PRO to the constant voltage DC
69 - 77 rpm
25 - 31 rpm
6. Turn power ON.
7. Insert the shorting plug into connector J3 on the
8. Remove the shorting plug.
9. Turn power OFF.
10. Replace the cover and secure with the screws.
LN-25™ PRO
the feeder and remove the cover.
150 in/min
welding power source. The work lead of the LN-25™
PRO must be connected to the work terminal of the
power source.
Control P.C. Board. The shorting plug shorts pins 4 &
8.
FIGURE D.2
D-2
COVER
P.C. bOARD
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