Bosch Rexroth PST 6 Serie Betriebsanleitung Seite 247

1070080029 / 05 | PST 6xx0
Example
You will find the relevant load diagram of your inverter in Section
5.3.3 on page 248 et seq.
Calculate the max. duty cycle ED of the thyristor power supply unit.
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 per.
In this example, the following result is obtained for duty cycle ED:
ED =
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 5.3.3 on page 248
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 continuous current or primary peak current.
Electric Drives | Bosch Rexroth AG
and Controls
Information on this product
Cycle time
50 mains cycles
(per.)
WLD
10 per.
x 100 % = 20 %
50 per.
) and
s
247 / 330
WLD
10 per.