Fronius TransPocket 4000 CEL Bedienungsanleitung Seite 91

"0.1 - 20" parameter (drooping characteristic with adjustable slope)
Parameter "0.1 - 20" is used to set a drooping characteristic (5). The setting ran-
ge extends from 0.1 A / V (very steep) to 20 A / V (very flat). Setting a flat cha-
racteristic (5) is only advisable for cellulose electrodes.
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 characteris-
tic (6).
The "P" parameter is particularly suitable for cellulose electrodes. The "P" para-
meter is therefore also the factory setting when the "MMA welding with Cel elec-
trode" process is selected.
If there are problems with a rod electrode tending to "stick", set the arc-force dy-
namic 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 cur-
rent)
(5) Characteristic where "0.1 - 20" parameter is selected (drooping characte-
ristic 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 operating point provides information on the actual welding voltage
and the actual welding current.
Where the welding current (I
grate along 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
operating point will be the point where the corresponding characteristic (4), (5)
or (6) intersects with the load line (2).
(2)
(1)
(3)
(8)
) is permanently set, the operating point may mi-
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