Setting
up Compax3
C3I12T11
224
192-120113 N08 C3I12T11 - December 2010
notch filter as well as the resonance point are very narrowband. If the resonance
point does only minimally change (e.g. by changing the masses involved), it is not
sufficiently activated by the notch filter.
Wrongly set notch filter
In the Compax3, two notch filters which are independent of each other are
implemented.
Frequency response of the notch filter.
Center frequency = 500Hz
Bandwidth = 50Hz
Depth = 0.99 (-40dB)
Parameterization by 3 objects.
In this chapter you can read about:
Frequency filter 1 (O2150.1) / frequency filter 2 (O2150.4) ............................................ 224
Bandwidth filter 1 (O2150.2) / bandwidth filter 2 (O2150.5) ............................................ 225
Depth filter 1 (O2150.3) / depth filter 2 (O2150.6) .......................................................... 225
Frequency filter 1 (O2150.1) / frequency filter 2 (O2150.4)
This defines the frequency at which the notch filter attenuation is highest. In
practice it shows that notch filters can only sensibly be used if the distance
between the controller bandwidth (velocity loop) and the center frequency is long
enough (at least factor 5). This permits to deduce the following recommendation:
4
x
or
1
x
]
[
17
.
2210
2
5000000
.
2150
=
=
⋅
≥
µs
O
x
O
π
Obj2210.17: Replacement time constant of the velocity loop in µs.
