Lincoln Electric RED-D-ARC LN-25 PRO EXTREME Operator's Manual page 20

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OPERATION
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 EXTREME 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
Wire Feed Speed setting where the above two
lines cross. (See Figure B.1a arrow line for 450.)
Set the LN-25™ PRO EXTREME wire feed
speed knob to this value.
CC WFS dial setting = desired WFS x 35
(See Figure B.1a)
FIGURE B.1a
CC
RED-D-ARC LN-25™ PRO EXTREME
Arc Volts
35
V
33
31
29
27
25
23
21
19
17
15
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 cur-
600 650 700
rent (CC) power source to obtain
passable results for noncritical
quality applications.
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