Cv Wire Feed Speed Operation - Lincoln Electric LN-25 SVM179-B Service Manual

B-5
Wire Feed Speed, CC Operation (See Figure B.2 or
See Table B.2)
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.2 graph for the setting for the
wire feed speed knob setting. Select the horizon-
tal line representing the Desired Wire Feed Speed.
(See Figure B.2 arrow for 375 in/min.)
3. Select the diagonal line representing the Arc Volts.
(See Figure B.2 for 29 volts.)
OPERATION
FIGURE B.2
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
CC
LN-25™ PRO
4. Determine the vertical line representing the CC
representing the CC Wire Feed Speed setting
where the above two lines cross. (See Figure B.2
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)
= 13125 = 452-5 (Vertical Line)
29
Set the Wire Speed Control at 450"/min.,
and when welding at 29 volts the average
actual speed should be approximately
375"/min.
600
B-5
Arc Volts
35 V
33
31
29
27
25
23
21
19
17
15
650 700