Setting
up Compax3
C3I20T11 / C3I32T11
220
192-120103 N13 C3I20T11 / C3I32T11 December 2010
If this distance is too small, the stability of the control can be very negatively
influenced!
Bandwidth filter 1 (O2150.2) / bandwidth filter 2 (O2150.5)
This defines the width of the notch filter.
The value refers to the entire frequency band, where the attenuation of the filter is
higher than (-)3dB.
In practice it shows that even if there is enough distance towards the control, it can
be negatively influenced by too high bandwidths (higher than 1/4 of the center
frequency).
5
x
or
2
x
4
4
/
1
.
2150
.
2150
=
=
≤
O
x
O
Depth filter 1 (O2150.3) / depth filter 2 (O2150.6)
With this the size of the attenuation of the filter must be at the position of the center
frequency. One stands here for complete attenuation (-
∞
dB) and zero for no
attenuation.
6
x
or
3
x
10
1
.
2150
20
]
[
=
=
−
=
−
dB
D
x
O
D [dB]: The desired attenuation at the center frequency in dB
Saturation behavior
In this chapter you can read about:
Current jerk response .................................................................................................... 220
Current jerk response with the activated saturation characteristic line ............................ 221
Saturation can be stated with the aid of current jerk responses at different current
height.
Current jerk response
Current jerk response of a motor to 2 different currents (1Arms / 2Arms)
1) Actual current
2) Setpoint current
In the above figure we can see from the settling response that the drive shows a
distinctive tendency to oscillate at doubled current. The saturation characteristic
line, which is used to linearly reduce the P-term of the current loop depending on
the current, helps against such a saturation behavior.
If you respect the saturation for the above example with the aid of the saturation
characteristic line, the tendency to oscillate of the current loop can again be
activated.
Note:
