Lincoln Electric 11389, LN-25, IM-939A, 11523 Wire Feed Speed Knob, Wire Feed Speed, CV Operation

B-4 OPERATION B-4

2.WIRE FEED SPEED KNOB

The large, calibrated wire feed speed knob makes for easy and accurate adjustment of the wire feed speed. The knob rotates 3/4 turn. Turn the knob clockwise to increase the wire feed speed, and counter clockwise to reduce the wire feed speed.

Models with analog voltmeters have a calibrated scale printed around the wire feed speed knob using "in/min" units. A separate decal with "m/min" units is included with these models wire feeder.

Models with digital displays show the wire feed speed on the display.

Wire Feed Speed, CV Operation

When Across the Arc models are operated with CV power sources, the wire feed speed will remain a con- stant value, independent of arc voltage changes, as along as the arc voltage does not drop below the val- ues per the following table.

CV Operation

	Maximum WFS	Minimum Arc Volts
280		15 V
340		17 V
440		21 V
	520	24 V
600		27 V

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 LN25 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 representing the CC Wire Feed Speed setting where the above two lines cross. (See Figure B.1a arrow line for 450.) Set the LN25 PRO EXTREME wire feed speed knob to this value.

CCWFS dial setting = desired WFS x 35 Arc Volts

(See Figure B.1a)

FIGURE B.1a

700													3533	V
650
													31
600													29
550													27
500													25
450													23
													21
400													19
350													17
300													15
250
200
150
100
50	100	150	200	250	300	350	400	450	500	550	600	650	700
50
				CC

LN-25 PRO EXTREME