Skip Frequencies - Lenze i55AE125B Manual

Motor control
Optimisation of motor control

Skip frequencies

8.3.2 Skip frequencies
By means of the three parameterisable skip frequencies, critical frequencies can be sup-
pressed which lead to mechanical resonances in the system.
Details
A blocking zone is active as soon as the frequency for this blocking zone is set to value unequal
to "0 Hz".
The set frequency defines the centre of the range to be masked out.
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The set bandwidth defines its total size.
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Example: For a blocking zone, the frequency is set to 20 Hz and the bandwidth to 10 Hz.
These settings mask out the range from 15 Hz to 25 Hz.
Notes:
Skip frequencies are absolute values. With the setting "20 Hz", at the same time also the
•
skip frequency "-20 Hz" is defined.
The inverter accelerates/decelerates the motor by the range to be masked out. A continu-
•
ous operation within this range is not possible.
A blocking zone is not active if its bandwidth is set to "0 Hz".
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Adjacent and overlapping ranges:
Example on the left: If the ranges are closely spaced, the ranges are passed through as
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shown.
Example on the right: If the ranges overlap, the lowest and highest value form a new
•
range. In the status display 0x291F:016, both ranges are shown as active.
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②
Output
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Output
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Input
①
[Hz]
Input
Output
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Input