Fronius TransPocket 4000 CEL Instructions De Service page 87

When setting a flat characteristic (5), set the arc-force dynamic to a higher value.
"P" parameter (constant welding power)
If the "P" parameter is set, the welding power is kept constant, irrespective of the welding
voltage and welding current. This results in a hyperbolic characteristic (6).
The "P" parameter is particularly suitable for cellulose electrodes. The "P" parameter is
therefore also the factory setting when the "MMA welding with Cel electrode" process is
selected.
If there are problems with a rod electrode tending to "stick", set the arc-force dynamic to
a higher value.
(V)
60
(4)
con - 20
(6)
A / V
50
(5)
40
30
20
(7)
10
0
0
50 100 150 200 250 300 350 400 450 (A)
Characteristics that can be selected using the Eln function
(1) Load line for rod electrode
(2) Load line for rod electrode where arc length is increased
(3) Load line for rod electrode where arc length is reduced
(4) Characteristic where "con" parameter is selected (constant welding current)
(5) Characteristic where "0.1 - 20" parameter is selected (drooping characteristic
with adjustable slope)
(6) Characteristic where "P" parameter is selected (constant welding power)
(7) Example of pre-set arc-force dynamic where characteristic (4) is selected
(8) Example of pre-set arc force dynamic where characteristic (5) or (6) is selected
Further explanations
The characteristics (4), (5) and (6) shown here apply when using a rod electrode whose
characteristic corresponds to the load line (1) at a given arc length.
Depending on what welding current (I) has been set, the point of intersection (operating
point) of characteristics (4), (5) and (6) will be displaced along the load line (1). The ope-
rating point provides information on the actual welding voltage and the actual welding
current.
Where the welding current (I
the characteristics (4), (5) and (6) according to the welding voltage at a given moment.
The welding voltage U is dependent upon the arc length.
If the arc length changes (e.g. in accordance with the load line (2)) the resulting opera-
ting point will be the point where the corresponding characteristic (4), (5) or (6) intersects
with the load line (2).
Applies to characteristics (5) and (6): Depending upon the welding voltage (arc length),
the welding current (I) will also become either smaller or larger, even though the value
set for I remains the same.
H
(2)
(1)
(3)
(8)
) is permanently set, the operating point may migrate along
H
87