Fronius TransSteel 2500c, Operating Instructions Manual

Page: 91 / 120

91
EN
Measuring welding circuit resistance r
General Measuring the welding circuit resistance r makes it possible to have a constant welding re-
sult at all times, even with hosepacks of different lengths. The welding voltage at the arc is
then always precisely regulated, regardless of the length and cross-sectional area of the
hosepack. The use of arc length correction is no longer required.
The calculated welding circuit resistance is shown on the display.
r = welding circuit resistance in milliohm (mOhm)
If the welding circuit resistance r has been measured correctly, the set welding voltage will
correspond exactly to the welding voltage at the arc. If you manually measure the voltage
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 hosepack.
Measure the
welding circuit re-
sistance r
Establish a grounding (earthing) connection to the workpiece
Accessing the Level 2 (2nd) Setup menu
Select parameter "r"
Remove the gas nozzle from the welding torch
Screw on the contact tip
Place the contact tip flush against the workpiece surface
Press the torch trigger briefly
- The welding circuit resistance is calculated. "run" is shown on the display during
the measurement.
The measurement is finished when the welding circuit resistance is shown on the display
in mOhm (e.g. 11.4).
Fit the gas nozzle back onto the welding torch
NOTE! The welding circuit resistance r depends on the hosepack used:
- If the length or cross-sectional area of the hosepack has changed, measure
the welding circuit resistance r again
- Measure the welding circuit resistance for every welding process separately
with the appropriate welding power-leads
NOTE! In order to obtain good welding results, it is essential to measure the weld-
ing circuit resistance correctly. Make sure that the contact between the earthing
clamp and the workpiece is on a cleaned workpiece surface.
NOTE! Make sure that the contact between the contact tip and the workpiece is
on a cleaned workpiece surface.
1
2
3
4
5
6
7
8