Lincoln Electric IM10031-A Wire Feed Speed KNOb, Wire Feed Speed, CV Operation, Extra Torque

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.

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
Minimum Arc Volts		Maximum WFS	Maximum WFS
		Standard Spin	(Extra Torque
		Gearing	Gearing)
15 V		280	210
17 V		340	235
21 V		440	400
24 V		520	400
27 V		600	400

FIGURE b.1a

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 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.

CCWFS 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) Use 450 setting (See Figure B.1a)

in/min.

700	35	ARC
650	33
600	31	VOLTS
	29
550	27
500	25
450	23	A constant voltage (CV) power
	21
400
	19	source is recommended for flux-
375		cored arc welding. (FCAW) and
	17
350		gas metal arc welding (GMAW) to
	15
300		obtain code quality results.
		However, this wire feeder may also
250
		be used with a constant current
200		(CC) power source to obtain pass-
150		able results for noncritical quality
		applications.
100

5050 100 150 200 250 300 350 400 450 500 550 600 650 700

CC

LN-25™ PRO