Fronius TransSteel 3500 Syn, Operating Instructions Manual

Page: 102 / 144

Measuring welding circuit resistance r
General Measuring the welding circuit resistance makes it possible to have a consistent
welding result 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 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.
The welding circuit resistance depends on the hosepack used:
- If the length or cross-sectional area of the hosepack has changed, measure
the welding circuit resistance again
- Measure the welding circuit resistance for every welding process separately
with the appropriate welding power-leads
Measuring weld-
ing circuit resist-
ance (MIG/MAG
welding)
NOTE!
Risk of incorrect measurement of the welding circuit resistance.
This may negatively affect the welding result.
▶
Ensure that the workpiece in the area of the earthing clamp provides an op-
timal contact surface (cleaned surface, free from rust, etc.).
1
Ensure that the MANUAL or SYNERGIC process has been selected
2
Establish a grounding (earthing) connection to the workpiece
3
Access the Level 2 (2nd) Setup menu
4
Select parameter "r"
5
Remove the gas nozzle from the welding torch
6
Screw on the contact tip
7
Make sure the wire electrode does not protrude from the contact tip
NOTE!
Risk of incorrect measurement of the welding circuit resistance.
This may negatively affect the welding result.
▶
Ensure that the workpiece provides an optimal contact surface for the con-
tact tip (cleaned surface, free from rust, etc.).
8
Place the contact tip flush against the workpiece surface
9
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 ( for example, 11.4).
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