Fundamental Principles and System Description
Engineering Information
SINAMICS Engineering Manual – November 2015
Ó Siemens AG
65/528
It is absolutely essential to make the correct settings.
If I
R
is set too low, there is a risk that the converter or infeed will be tripped erroneously
when it is operating under high continuous load conditions. This can result in damage to
the installation or to the converter/infeed.
Very high setting values for the short-time delayed short-circuit current I
sd
and the
associated delay time t
sd
delay the response of the circuit breaker unnecessarily and can
therefore lead to significantly more extensive equipment damage.
Electronic trip unit
ETU25B
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