Bosch Rexroth PST 6 Serie Betriebsanleitung Seite 295

1070087088 / 08 | PST 6xxEx
Example
You will find the relevant load diagram of your inverter in Section
5.4.3 on page 296 et seq.
Calculate the max. duty cycle ED.
1.
As a result of the low heat capacity of semi‐conductors, their maxi­
mum permissible duty cycle is determined on the basis of the time
ratio "weld time to cycle time".
10 cyc.
In this example, the following result is obtained for duty cycle ED:
Duty cycle =
If different weld times or cycle times occur within the application,
"
use
• the longest weld time (t
• the shortest cycle time
to calculate the duty cycle.
Look for the unit‐specific load diagram in section 5.4.3 on page 296
2.
et seq.
First draw the vertical at the previously calculated duty cycle (refer to
3.
point 1.: duty cycle ED = 20 %).
Use the respective characteristics to determine the maximum
4.
permissible primary current.
Bosch Rexroth AG
Information on this product
Cycle time
50 mains cycles
(cyc.)
WLD
10 cyc.
10 cyc.
x 100 % = 20 %
50 cyc.
) and
s
295 / 416
WLD