Lincoln Electric IM10079 LN-25 PRO DUAL POWER - Manual (Page 21)

B-3 OPERATION B-3
LN-25™ PRO DUAL POWER
The serviceability of a product or structure utiliz-
ing the LN-25 PRO wire feeder is and must be the
sole responsibility of the builder/user. Many vari-
ables beyond the control of The Lincoln Electric
Company affect the results obtained in using the
LN-25 PRO wirefeeder. These variables include,
but are not limited to, welding procedure, plate
chemistry and temperature, weldment design, fab-
rication methods and service requirements. The
available range of the LN-25 PRO wirefeeder may
not be suitable for all applications, and the
builder/user is and must be solely responsible for
welding settings.
CONSTANT CURRENT OPERATION
Setting Wire Feed Speed in CC mode
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.1)
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.1
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