Fronius MagicWave 1700, Operating Instructions Manual, Page: 153 / 287

45
The characteristics , and shown here apply when using a rod electrode whose
characteristic corresponds - at a given arc length - to the load line .
Further
explanations of
the “Eln”
characteristic-
selection
function
“P” parameter (constant welding power)
- If the “P” parameter has been set, the welding power is kept constant, irrespective
of the welding voltage and welding current. This results in a hyperbolic
characteristic (Fig. 25).
- The “P” parameter is particularly suitable for cellulose electrodes.
Important! If there are problems with a rod electrode tending to “stick”, set the arc-
force dynamic to a higher value.
“Eln” characteri-
stic-selection
function
(continued)
... Load line for rod electrode
... Load line for rod electrode where arc
length is increased
... Load line for rod electrode where arc
length is reduced
... Characteristic where “con” parameter
is selected (constant welding current)
... Characteristic where “0.1 - 20”
parameter is selected (falling
characteristic with adjustable slope)
... Characteristic where “P” parameter is
selected (constant welding power)
... Ex. of preset arc force dynamic where
characteristic or is selected
... Possible change in the current where
characteristic or is selected, as a
function of the welding voltage (arc
length)
... Operating point where arc-length is
long
... Operating point where welding
current I
1
is set
... Operating point where arc-length is
short
Fig.26 Settings example: I
1
= 125 A, arc-force dynamic = 50
5
10
15
20
25
30
U (V)
50 150 200 100
I (A)
I
1
+ arc-force dynamic I
1
- 50 %
Depending on what welding current (I) has been set, the point of intersection (operating
point) of characteristics , and will be displaced along the load line . The
operating point provides information on the actual welding voltage and the actual
welding current.