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8 Adjustment of Internal Settings
E-625 Piezo Servo Controller
PZ166E
Version: 2.0.0
43
8.5
Adjusting Notch Filter and P-I Controller
The E-625 is equipped with a notch filter with which the oscillations at the mechanical resonant
frequency can be suppressed in dynamic operation.
Adjusting the P-I controller optimizes the system's dynamic properties (overshoot and settling
time). The objective is a compromise between the best stability (avoid oscillation of the
positioner) and the highest speed. The optimal P-I controller settings depends on your
application and your requirements.
If the load to be moved has changed or PI had no information on your system when
shipped, do the following steps immediately in sequence:
1.
Adjust (p. 43) the notch filter.
2.
Improve the settings of the P-I controller (p. 46).
All adjustment elements are located on the E-802.55 servo controller submodule.
INFORMATION
If the
X4
jumper on the main board is in the default setting (p. 38), the notch filter and the
slew rate limiter for the piezo voltage will be active when servo mode is switched off.
Readjusting the notch filter frequency in open-loop operation could lead to a change in the
piezo voltage up to 5 %.
INFORMATION
If you make the settings in the computer-controlled mode, you will not require a function
generator. You can then use the wave table output to generate a square wave signal.
For more information, refer to the user manual for the E-816 computer interface
submodule.
8.5.1
Adjusting the Notch Filter
Requirements
You have read and understood the general notes on the adjustment of settings (p. 35).
You have the user manual of the E-802 servo controller submodule within reach.
The E-625 has been disconnected from the power source, i.e., the wide input range
power supply is
not
connected to the power socket using the power cord.
The E-625 has been installed properly (p. 15).
You have installed the positioner in the same way as it will be used in your application
(corresponding load and orientation).
You have opened the E-625 (p. 36).