User Manual
E727T0005, valid for E-727
BRO, 2019-06-28
Physik Instrumente (PI) GmbH & Co. KG, Auf der Roemerstrasse 1, 76228 Karlsruhe, Germany
Page 35 / 240
Phone +49 721 4846-0, Fax +49 721 4846-1019, Email
Control Details
Slew Rate Limitation
In closed-loop operation, the target signal can be manipulated by a slew rate limitation. For fastest
possible settling, the slew rate limitation can be switched off with the VCO command.
The slew rate limit for an axis is given by the
Servo Loop Slew-Rate
parameter (ID 0x07000200).
Control Algorithms
The control algorithm to be used in closed-loop operation can be selected for each axis via the
Closed-Loop Control Mode
parameter (ID 0x07030100). Possible values of the parameter:
0 = None
1 = PID algorithm (position control)
Optional: 2 = Advanced Piezo Control (APC) algorithm, licence must be ordered separately, see
“Accessories” (p. 19)
With the PID algorithm, up to two notch filters can be used. The PID algorithm in principle has the
following structure:
Figure 13: Structure of the PID algorithm; two notch filters are available