ABB ACS880 Firmware Manual page 321

No. Name / Range /
Selection
24.17 Damping of pole
-1.000 ... 1.000
Description
Defines the damping coefficient for parameter 24.16.
The coefficient shapes the frequency response of the
resonance frequency filter. A narrower bandwidth
results in better dynamic properties. By setting this
parameter to 1, the effect of the pole is eliminated.
20log |H (ω)|
10
40
20
0
f = 45 Hz
zero
-20
f = 40 Hz
pole
ξ = 0
zero
-40
ξ
= 0.750
pole
-60
0
Note: To ensure that the resonance frequency band is
filtered (rather than amplified), the value of
be smaller than 24.17.
Damping coefficient.
f
= 45 Hz
zero
f = 40 Hz
pole
ξ = 0
zero
ξ = 0.050
pole
f = 45 Hz
zero
f = 40 Hz
pole
ξ
= 0
zero
ξ
= 0.250
pole
50 100
f (Hz)
24.15
Parameters 321
Def / Type
FbEq 16b / 32b
0.250 / real32
must
100 = 1 / 1000 = 1