6 Startup
26
Version: 2.0.0
PZ166E
E-625 Piezo Servo Controller
When the system test in open-loop operation was successful or if you have adapted the
notch filter and/or zero point:
5.
Switch the servo mode on by moving switch 3 on the
Settings
DIP switch block to ON
(down).
If an oscillation (positioner's humming) can be heard after switching on the servo mode:
a)
Switch the servo mode off immediately.
b)
Open the E-625 (p. 36).
c)
Adjust the P term for the P-I controller by turning the P2 potentiometer on the
E-802.55 servo controller submodule (p. 37) with the trimmer adjustment tool fully
counterclockwise.
Typically you will hear a click.
d)
Reconnect the power cord on the wide range input power supply to the power
socket.
e)
Switch the servo mode on again.
6.
Check the notch filter setting in closed-loop operation:
a)
Measure again the resonant frequency of the positioner (see step 3).
b)
If necessary, improve the setting of the notch filter on the E-802.55 servo controller
submodule (p. 43).
7.
Determine the settling behavior of the positioner in closed-loop operation:
a)
Make sure that servo mode is switched on (switch 3 on the
Settings
DIP switch
block to ON (down)).
b)
Generate a 1-V square wave signal (peak-peak) with 2 to 5 Hz using the function
generator.
c)
On the oscilloscope, observe the step response of the positioner (sensor monitor
signal over time).
If the sensor monitor signal shows an unsatisfactory adjustment of the P-I controller
(for example overshoot or settling time too long):
d)
Open the E-625 (p. 36).
e)
Adjust the P term and the I term of the controller with the corresponding
adjustment elements (p. 43) until the positioner shows the optimal settling
behavior for your application.
8.
When the housing is open:
a)
Disconnect the E-625 from the power source by removing the power cord of the
wide input range power supply from the power socket.
b)
Close the E-625.
If the system test was successful, you can work with the E-625 and the connected
positioner. A renewed system test is only necessary in the following cases:
The conditions of use have changed (load, installation, ambient temperature).
