PI E-727 - Page 215

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 215 / 240
Phone +49 721 4846-0, Fax +49 721 4846-1019, Email info@pi.ws, www.pi.ws
Fault: Stage does not move
Possible Causes Solution
E-727 models with
EtherCAT interface
(p. 164): Transition to
the Ready to switch
on state not possible

Make sure that the conditions for a transition to Ready to switch on are fulfilled
(p. 169).
Fault: Stage executes unintentional motion
Possible Causes Solution
Configuration of the E-
727
The E-727 can be configured with parameter settings so that the AutoZero
procedure (p. 62) is automatically executed after switching on or rebooting.
 Check the setting of the Power Up AutoZero Enable
parameter (ID 0x07000802)
and adjust it if necessary.
Start-up macro is
executed

Check whether a macro is specified as the start-up macro and cancel the
selection of the start-up macro if necessary (p. 123).
Fault: Stage is oscillating or positions inaccurately
Possible Causes Solution
The load was changed.
Unsuitable settings of the notch filter and the servo-control parameters of the
E-727 can cause the stage to oscillate or to position inaccurately. Oscillations can
damage the stage and/or the load affixed to it.
 If the stage is oscillating (unusual operating noise), immediately switch off the
servo mode or switch off the E-727.
 Only switch on the servo mode after you have modified the settings of the
notch filter and the servo-control parameters of the E-727; see „Adjusting the
Notch Filter(s) in Open-Loop Operation“ (p. 136) and "Checking and Optimizing
the Servo-Control Parameters" (p. 140).
Thermal instability of
the system
The E-727 performance can be reduced directly after power on due to thermal
instability.
 Switch the E-727 on at least one hour before starting work.
 If the E-727 is not used, but should remain switched on to ensure the
temperature stability: Make sure that the servo mode is switched off (open-
loop operation) and the piezo output voltage is set to 0 V. To set the piezo
output voltage to 0 V, set the axis position to a corresponding value with the
SVA command.