TECNA TE470, Instruction Manual, Page: 26 / 52

S.p.A.
TE470/TE480 Instruction Manual
Example:
The welding tests proved that: the electrode life corresponds to 2000 welding spots; that with new electrodes the
required current is 15 kA; that after 2000 spots the electrodes diameter increment requires a 19 kA current.
The percent variation is calculated as follows:
% 26 100
15
15 19
100 %
 

 


rent initialcur
rent initialcur endcurrent
Change
The following parameters are then set in the set-up menu:
PARAMETER DESCRIPTION OF THE PARAMETERS
VALUE
TOTAL STEPS
Number of segments for stepper function
1
SPOTS 1
First segment spots number
2000
INCREMENT 1
First segment increment percent
26%
The welding program must be first adjusted to carry out the first weld and then adjusted to obtain the necessary
current with the electrodes' starting diameter: 15 kA. It does not matter if the TE470/TE480 is programmed to be
adjusted in percentage or constant current since the stepper function works in both modes.
It is then possible to start the welding process. The welding current increases according to the set stepper
function. The following diagram shows the current variations:
INITIAL CURRENT = 15 kA
FINAL CURRENT = 19 kA
INCREMENT PERCENT = 26 %
WELDING SPOTS NUMBERS = 2000
CURRENT INCREASE DURING THE PRODUCTION
0
2
4
6
8
10
12
14
16
18
20
0 500 1000 1500 2000
NUMBER OF WELDINGS
W
E
LDING CURRENT (kA
)
After having performed all the 2000 welds, the TE470/TE480 stops the production and displays the following
message:
MAX SPOTS
NUMBER
At this point the operator replaces the electrodes (or resets their original diameter) and clears the spots counter
to clear stepper calculations.
The TE470/TE480 resets the initial work parameters and begins a new increment phase.
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