8 Adjustment of Internal Settings
E-625 Piezo Servo Controller
PZ166E
Version: 2.0.0
45
10.
Turn the P4 potentiometer on the E-802.55 servo controller submodule by using the
trimmer adjustment tool to optimally adapt the notch filter frequency to the resonant
frequency of the positioner.
11.
Repeat the last steps until the resonant frequency of the positioner has the best
damping.
12.
Improve the settings of the P-I controller (p. 46).
In the two figures below, you can find examples for resonant frequency measurements with a
digital storage oscilloscope. They show the input voltage and the sensor signal as well as the FFT
(Fast Fourier Transform) of the sensor signal.
Figure 11: Open-loop operation, notch filter not adjusted, first resonant frequency at 119 Hz
Figure 12: Open-loop operation, first resonant frequency damped by the notch filter
