Constant Current Operation - Lincoln Electric LN-25X Operator's Manual

LN-25X™

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 LN-25X™ to "CC" in the setup menu.
2. Refer to the Figure B.4 graph to determine CC setting of the
wire feed speed knob. Select the horizontal line representing
the Desired Wire Feed Speed. (See Figure B.4 arrow for 375
in/min.)
3. Select the diagonal line representing the Arc Volts. (See
Figure B.4 for 29 volts.)
4. Determine the vertical line representing the CC Wire Feed
Speed setting where the above two lines cross. (See Figure
B.4 arrow line for 450.) Set the LN-25X™ 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.4)
700
650
600
550
500
450
400
350
300
250
200
150
100
50
50 100 150 200 250 300 350 400 450 500 550
(Actual wire feed speed)
Arc Volts
Use 450 setting
FIGURE B.4
CC
ARC
35
V
VOLTS
33
31
29
A constant voltage (CV) power source is
27
recommended for flux-cored arc welding.
25
(FCAW) and gas metal arc welding
23
(GMAW) to obtain code quality results.
However, this wire feeder may also be
21
used with a constant current (CC) power
19
source to obtain passable results for
17
noncritical quality applications.
15
600 650 700
B-8
OPERATION