1070080029 / 05
Bosch Rexroth AG
Electric Drives
and Controls
PST 6xx0
|
|
247
Information on this product
You will find the relevant load diagram of your inverter in Section
5.3.3 on page 248 et seq.
Example
1.
Calculate the max. duty cycle ED of the thyristor power supply unit.
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”.
50 mains cycles
(per.)
WLD
10 per.
WLD
Cycle time
10 per.
In this example, the following result is obtained for duty cycle ED:
ED =
10 per.
50 per.
x 100 % =
20 %
"
If different weld times or cycle times occur within the application,
use
•
the longest weld time (t
s
) and
•
the shortest cycle time to calculate the duty cycle.
2.
Look for the unit‐specific load diagram in section 5.3.3 on page 248
et seq.
3.
First draw the vertical at the previously calculated duty cycle (refer to
point 1.: duty cycle ED = 20 %).
4.
Use the respective characteristics to determine the maximum
permissible primary continuous current or primary peak current.
ENGLISH
Summary of Contents for Rexroth PST 6 0 Series
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