In certain applications, it is necessary to fade out reference frequencies. In this way, resonance
points of the system as stationary operating points are avoided. Parameters 1st Blocking Frequency
447 and 2nd Blocking Frequency 448 with parameter Frequency Hysteresis 449 define two
resonance points.
A blocking frequency is active if the parameter values of the blocking frequency and the frequency
hysteresis are not equal to 0.00 Hz.
The area faded out as a stationary working point by the hysteresis is passed through as quickly as
possible according to the ramp set. If the output frequency is limited as a result of the selected
control parameter settings, e.g. if the current limit is reached, the hysteresis is passed through with
a delay. The behavior of the reference value can be determined from its direction of movement
according to the following diagram.
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