8 Adjustment of Internal Settings
54
Version: 2.0.0
PZ166E
E-625 Piezo Servo Controller
8.6.3
Adjusting the Sensor Linearization
The sensor linearization should minimize the nonlinear second order contributions to the
sensor signal.
INFORMATION
The sensor linearization can only be optimized for one direction of motion. PI by default makes
the optimization for the positive direction of motion, i.e. for the motion from the zero
position to the upper travel range limit.
Requirements
You have correctly adjusted the sensor range (p. 48).
You have correctly adjusted the static sensor gain for closed-loop operation (p. 51).
You have not changed anything on the system setup that was used for the adjustment
of the sensor range and the static sensor gain. All devices are still ready for operation.
The servo mode is switched on.
Tools and Accessories
As for the adjustment of the sensor range (p. 48)
Adjusting the Sensor Linearization in Analog Mode
1.
For the linearization of the positive direction of motion:
Increase the input voltage on the
ANALOG IN/WTT
SMB socket in increments of 1 volt
from 0 V to 10 V and read the position of the positioner from the external measuring
device.
For the linearization of the negative direction of motion: Reduce the input voltage
stepwise from 10 V to 0 V.
2.
Using the trimmer adjustment tool, adjust the R144 (p. 37) ILS adjust potentiometer on
the main board until the position of the positioner changes as linearly as possible as a
function of the input voltage.
Adjusting the ILS adjust potentiometer also changes the sensor gain.
3.
After setting the optimal linearity, repeat the adjustment of the static sensor gain for
the closed-loop operation (p. 51).
4.
Disconnect the E-625 from the power source by removing the power cord of the wide
input range power supply from the power socket.
5.
Close the E-625.
Adjusting the Sensor Linearization in Computer-Controlled Mode
1.
For the linearization of the positive direction of motion:
Increase the target position using the MOV command stepwise from 0 µm to the upper
travel range limit of the positioner while reading the position of the positioner on the
external measuring device.
