S.p.A.
TE470/TE480 Instruction
Manual
2.8 – ADJUSTING THE FIRST INSERT DELAY
During the
installation
stage, it is compulsory to adjust the first insert delay to decrease absorption from the
feed line and to decrease the power dissipated at the transformer primary circuit (risk of damaging the weld
transformer permanently). This adjustment permits optimizing the balance of the machine absorption from
mains.
In order to carry out the adjustment, set the control unit to max power value (POWER=99%) and carry out "no
load" welds, cutting off the secondary circuit (e.g.: by placing insulation between electrodes).
Adjust parameter FIRST INSERT, in the SETUP MENU, so that positive and negative line absorptions are
balanced. Use an ammeter to measure the maximum positive and negative peak values. The adjustment is
correct when the positive peak value is similar to the negative one.
Use an appropriate current gauge having a CAT III 600V class of insulation and work by wearing specific
insulated gloves when making interventions at powered lines.
In order to simplify the FIRST INSERT adjustment, it is advisable to use an ammeter that shows the waveform
on a digital oscilloscope. In this case carry out the adjustment so that all the primary current half-waves have the
same amplitude.
The following charts show waveforms obtained through a wrong and a correct adjustment.
Unbalanced absorption
Balanced absorption
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