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b-4
2. WIRE FEED SPEED KNOb
The large, calibrated wire feed speed knob makes
for easy and accurate adjustment of the wire feed
speed. The knob rotates 3/4 turn. Turn the knob
clockwise to increase the wire feed speed, and
counter clockwise to reduce the wire feed speed.
Models with analog voltmeters have a calibrated
scale printed around the wire feed speed knob
using "in/min" units. A separate decal with "m/min"
units is included with these models wire feeder.
Wire Feed Speed, CV Operation
When Across the Arc models are operated with CV
power sources, the wire feed speed will remain a con-
stant value, independent of arc voltage changes, as
along as the arc voltage does not drop below the val-
ues per the following table.
CV OPERATION
Maximum WFS
Minimum Arc Volts
Standard Spin
15 V
17 V
21 V
24 V
27 V
700
2 5 0
1 0 0
5 0
3 5 0
3 0 0
2 0 0
1 5 0
C C
6 0 0
6 5 0 7 0 0
5 0 1 0 0 1 5 0 2 0 0 2 5 0 3 0 0 3 5 0 4 0 0 4 5 0 5 0 0 5 5 0
1 5
1 7
3 7 5
5 5 0
5 0 0
6 5 0
6 0 0
4 5 0
7 0 0
4 0 0
3 5
3 3
1 9
2 1
2 3
2 5
2 7
V O L T S
2 9
A R C
3 1
650
600
550
500
450
400
375
350
300
250
200
150
100
50
50
100 150 200 250 300 350 400 450 500 550
OPERATION
Maximum WFS
(Extra Torque
Gearing
Gearing)
210
280
340
235
440
400
520
400
600
400
FIGURE b.1a
CC
LN-25™ PRO
Wire Feed Speed, CC Operation
When Across the Arc models are operated with CC
power sources, the wire feed speed changes as the
arc voltage changes. When the arc voltage increases,
the wire feed speed will increase; and when the arc
voltage decreases, the wire feed speed will decrease.
To preset the wire feed speed on CC power sources:
1. Set the Wire Feed Mode switch inside the LN-
25™ Pro to "CC".
2. Refer to the Figure B.1a graph for the setting for
the wire feed speed knob setting. Select the hori-
zontal line representing the Desired Wire Feed
Speed. (See Figure B.1a arrow for 375 in/min.)
3. Select the diagonal line representing the Arc
Volts. (See Figure B.1a for 29 volts.)
4. Determine the vertical line representing the CC
representing the CC Wire Feed Speed setting
where the above two lines cross. (See Figure
B.1a arrow line for 450.) Set the LN-25™ Pro
wire feed speed knob to this value.
CC WFS dial setting = desired WFS x 35
Example:
375 in/min. (Horizontal Line) x 35
=
29 Arc Volts (Diagonal Line)
=
452.5 (Vertical Line)
(See Figure B.1a)
ARC
35
33
VOLTS
31
29
27
25
23
A constant voltage (CV) power
21
source is recommended for flux-
19
cored arc welding. (FCAW) and
17
gas metal arc welding (GMAW) to
15
obtain code quality results.
However, this wire feeder may also
be used with a constant current
(CC) power source to obtain pass-
able results for noncritical quality
applications.
600
650 700
b-4
Arc Volts
Use 450 setting
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