Maximum WFS
(Standard
Torque)
400
450
570
650
700
Maximum WFS
(Extra Torque )
220
250
300
350
400
Minimum Arc Volts
15 V
17 V
21 V
24 V
27 V
b-4
OPERATION
b-4
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
Arc Volts
Example:
375 in/min. (Horizontal Line) x 35
29 Arc Volts (Diagonal Line)
= 452.5 (Vertical Line)
(See Figure B.1a)
LN-25™ PRO
50
100
150
in/min.
200
250
300
350
375
400
450
500
550
600
650
700
50 100 150 200 250 300 350 400 450 500 550
650 700
35
31
29
27
25
23
21
19
17
15
33
600
ARC
VOLTS
CC
FIGuRE b.1a
CV OPERATION
A constant voltage (CV) power
source is recommended for flux-
cored arc welding. (FCAW) and
gas metal arc welding (GMAW) to
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.
=
use 450
setting
The serviceability of a product or structure utilizing the
LN-25™ PRO wire feeder is and must be the sole
responsibility of the builder/user. Many variables
beyond the control of The Lincoln Electric Company
affect the results obtained in using the LN-25™ PRO
wire feeder. These variables include, but are not lim-
ited to, welding procedure, plate chemistry and tem-
perature, weldment design, fabrication methods and
service requirements. The available range of the LN-
25™ PRO wire feeder may not be suitable for all
applications, and the builder/user is and must be sole-
ly responsible for welding settings.
