ABB ACS880 Firmware Manual page 226

226 Parameters
No. Name/Value
24.14 Frequency of zero
0.50 ... 500.00 Hz
24.15 Damping of zero
-1.000 ... 1.000
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Description
Defines the zero frequency of the resonance frequency filter.
The value must be set near the resonance frequency, which is
filtered out before the speed controller.
The drawing shows the frequency response.
20log |H()|
10
20
0
-20
-40
-60
0 50
Zero frequency.
Defines the damping coefficient for parameter 24.14. The
value of 0 corresponds to the maximum elimination of the
resonance frequency.
20log |H()|
10
20
f


0
-20
-40
-60
0 50
Note: To ensure that the resonance frequency band is filtered
(rather than amplified), the value of
than 24.17.
Damping coefficient.
100
= 45 Hz
zero
= 0.250
zero
= 1
pole
f = 45 Hz
zero

= 0
zero

= 1
pole
100
24.15 must be smaller
Def/FbEq16
45.00 Hz
150
f (Hz)
1 = 1 Hz
0.000
150
f (Hz)
100 = 1