ABB ACS880 Firmware Manual page 320

320 Parameters
No. Name / Range /
Selection
24.15 Damping of zero
-1.000 ... 1.000
24.16 Frequency of pole
0.50 ... 500.00 Hz
Description
Defines the damping coefficient for parameter 24.14.
The value of 0 corresponds to the maximum elimination
of the resonance frequency.
|H (ω)|
20log
10
20
0
-20
-40
-60
0
50
Note: To ensure that the resonance frequency band is
filtered (rather than amplified), the value of
be smaller than 24.17.
Damping coefficient.
Defines the frequency of pole of the resonance
frequency filter.
20log |H (ω)|
10
40
f
zero
ξ
zero
20
0
-20
f = 45 Hz
zero
f
= 30 Hz
pole
-40
ξ
= 0
zero
ξ = 0.250
pole
-60
0
Note: If this value is very different from the value of
24.14, the frequencies near the frequency of pole are
amplified, which can damage the driven machine.
Frequency of pole.
f
= 45 Hz
zero
ξ = 0.250
zero
ξ = 1
pole
f = 45 Hz
zero
ξ = 0
zero
ξ
= 1
pole
100
24.15
= 45 Hz, f = 50 Hz
pole
= 0, ξ = 0.250
pole
f
= 45 Hz
zero
f
= 40 Hz
pole
ξ = 0
zero
ξ = 0.250
pole
50
Def / Type
FbEq 16b / 32b
0.000 / real32
150
f (Hz)
must
100 = 1 / 1000 = 1
40.00 Hz / real32
100
f (Hz)
1 = 1 Hz / 100 = 1 Hz