Instruction manual
ITEM TE550
S.p.A.
2.15
- ADJUSTING THE FIRST INSERT DELAY
During
installation
it is compulsory to adjust the first insert delay both to reduce absorption
from the power line and to reduce power dissipation at the transformer's primary (risk of
damaging the weld transformer permanently). This adjustment permits optimizing the
machine line absorption balance.
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
FEATURES MENU
, so that positive and negative
line absorptions are balanced. Use an ammeter allowing measuring the maximum positive
and negative peak values. The adjustment will be correct when the positive peak value is
similar to the negative one.
It is necessary to use a proper current measurement device providing CAT III 600V
insulating class and operate with suitable insulating gloves for intervening on supplied
mains.
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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