Measuring Welding Circuit Resistance R; General; Measuring The Welding Circuit Resistance R - Fronius TransPocket 4000 CEL Instructions De Service

Measuring welding circuit resistance r

General

Measuring the welding circuit resistance "r" makes it possible to have a constant welding
result at all times, even with different welding cable lengths. The welding voltage at the
arc is then always precisely regulated, regardless of the welding cable length and cross
section.
The calculated welding circuit resistance is shown on the right-hand display.
r ... Welding circuit resistance... x milliohms (e.g. 11.4 milliohms)
If the welding circuit resistance r has been measured correctly, the welding voltage will
correspond exactly to the welding voltage at the arc. If you manually measure the vol-
tage on the output jacks of the power source, this voltage will be higher than the welding
voltage at the arc - that is, higher by the same amount as the voltage drop of the welding
potential cable.
IMPORTANT! The welding circuit resistance r depends on the welding power-leads
used. The measurement to find out the welding circuit resistance r is therefore
-
-
Measuring the
1
welding circuit
resistance r
2
3
4
IMPORTANT! Make sure that the contact between the earthing clamp and the workpiece
is on a cleaned section of the workpiece.
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repeated if there is any change in the welding cable length or cross section
performed separately for each welding process (with the associated welding power-
leads)
Establish a grounding (earthing) connection to the workpiece
- Make sure that the contact between the earthing clamp and the workpiece is on
a cleaned section of the workpiece.
Plug in the mains plug
Set the mains switch (8) to the "I" position
Select function "r" in the second menu level (2nd)
Clamp the electrode holder or clam-
5
ping body for tungsten electrode firmly
to the workpiece or press firmly
against the workpiece
Press the Parameter selection button
6
(2). The welding circuit resistance is
now calculated; during the measure-
ment the right-hand display reads
"run"
The measurement is finished when
7
the welding circuit resistance is shown
on the right-hand display (e.g. 11.4
milliohms)