Minimum switching frequency whereby the sinus filter may
be operated (typical values 4kHz, 8kHz). "error norm motor-
data" is displayed in dr02 if the max. switching frequency
(de38) of the inverter is smaller than this value. Otherwise
the smallest switching frequency that is higher or equal to
dr53 is used. Then the parameterization of is10 has no ef-
fect.
Example: is10 = 4kHz
dr53 = 8kHz
de33 = 8kHz
=> switching frequency = 8kHz