User Manual
E712T0010, valid for E-712.N1, E-712.1AM, E-712.1AN, .2AN, .3AN
CMo, BRo, 10/31/2024
Physik Instrumente (PI) SE & Co. KG, Auf der Römerstraße 1, 76228 Karlsruhe, Germany page 22 / 40
Phone +49 721 4846-0, fax +49 721 4846-1019, e-mail info@pi.ws, www.pi.ws
Keep in mind that stepping motion is always affected by residual cross talk and other interferences. During
stepping motion in nanostepping mode, these effects are reduced compared to the full-step mode.
6.2 How to Command Motion
See “Control Value Generation” in the E-712 User Manual for how to command motion. Furthermore, consider
the following when working with PiezoWalk® drives:
In closed-loop operation, target positions are commanded. Depending on the driving mode selection
made with the PiezoWalk Driving Mode parameter and on the commanded target, motion is realized in
full-step and/or analog mode or in nanostepping mode.
The internal control value for PiezoWalk®-driven axes and PiezoWalk® drives is a velocity and hence
influenced by the settings for step size per cycle and minimum cycle time.
In open-loop operation, the control sources described in the E-712 User Manual (e.g. axis-related move
commands, wave generator, analog input) affect the shearing components of the piezo actuators only
which will always cause motion in analog mode. Stepping motion must be started with the PiezoWalk-
channel-related OSM command. See Section 3 on p. 4 for more information on driving modes.
To increase the lifetime of the PiezoWalk® drives, perform a relax procedure whenever there is no need for
closed-loop positioning. See Section 4 on p. 12 for details.
INFORMATION
For axes measured by incremental sensors, switching to closed-loop operation is only possible after they
were referenced. See “How to Reference an Axis” in the E-712 User Manual (PZ195E) for further details.
INFORMATION
If PiezoWalk® drives are moved at too high velocities, the high voltage output of the E-711/E-712 can be
deactivated due to internal overheating, or the maximum output power of the E-711/E-712 can be exceeded
so that the system is switched off automatically.
Do not move all axes simultaneously at maximum velocity. Move only one axis with maximum velocity
at a time.
Do not move the axes permanently at maximum velocity.
Change the parameters for the PiezoWalk® drive performance (p. 24) only after careful consideration
and be aware that overheating of the E-711/E-712 system or overloading of its power supply is then your
responsibility.
If the E-711/E-712 has overheated or the maximum output power has been exceeded, wait a few
minutes to let the E-711/E-712 system cool down. If necessary, switch the E-711/E-712 system off and
on again.
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