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1070 078 224- -108
PSU 5000 / PSG 3000
Instructions for Assembly and Operation
3. Calculate the duty cycle (ED) [2s] of the diodes on the basis of the sequence
with the highest number of weld time cycles:
number of weld time cycles
ED [2s] =
2 seconds
4. Use the diagram to determine the maximum welding current for the diodes. For
this purpose, first draw a vertical line at the duty cycle value of the diodes which
you calculated before (ED=30%).
Combine this diode characteristic with the higher next number of weld time cy-
cles (i.e. characteristic
level (cf. P1) you can directly read off the max. welding current i
from the left axis (in this case approx. 21 kA).
Taking into account the actual number of weld time cycles (in this case 30 cy-
cles), you may also obtain the intersection by interpolating between two adja-
cent characteristics (in this case characteristics
In this case, you will obtain the (more accurate) max. welding current of approx.
22.2 kA (i
) for this example.
1ipo
5. Calculate the duty cycle ED[60s] of the PSG:
t
x number of spots per min. + 1
s
ED [60s] =
(Note : For the calculation of t
6. Determine the maximum welding current of the PSG with the help of the dia-
gram. For this purpose, you should first draw a vertical line at the value of the
PSG duty cycle you calculated before (ED=10.5%).
Now use characteristic Y.
At the intersection level (cf. P2) you can directly read off the max. welding cur-
rent i
for the PSG from the left axis: in this example approx. 17 kA.
2
7. Always use the lowermost value of the two welding currents i
mum welding current for your welding task (in this case 17 kA).
30 cycles x 0.02
x 100 % =
with a given 30 weld time cycles). At the intersection
x 100 % =
60s
refer to item 2)
s
Technical
x 100 % = 30 %
2 seconds
for the diodes
1
and V; cf. intersection P1
0.3s x 21
x 100 % = 10.5 %
60 s
and i
as maxi-
1
2
data
).
ipo
5--13
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