piezosystem jena
COMPETENCE
IN PRECISION
16 piezosystem jena GmbH
Pruessingstrasse 27 • 07745 Jena • Germany
Tel
+
49
(0)
3641
66
88
–0 • Fax +49 (0) 3641 66 88 – 66 • e-mail: [email protected] • http://www.piezojena.com 4. Instructions for using piezoelectrical elements and
power supplies
Piezoelectric actuators from piezosystem jena are controlled by voltages up
to 150V. These values can be quite hazardous. Therefore read the
installation instructions carefully and only authorized personal should handle
the power supply.
After transportation, piezoelectric actuators should be allowed to adapt for
approximately 2 hours to the room temperature before being switched on
Piezoelectric actuators are made from ceramic materials with and without
metallic casings. The piezo-ceramic is a relatively brittle material. This should
be noted when handling piezoelectrical actuators. All piezo-elements are
sensitive to bending or shock forces.
Due to the piezoelectric effect piezo-actuators can generate electrical
charges by changing the mechanical load or the temperature or such actions
described above
Piezoelectric actuators are able to work under high compressive forces, only
actuators with pre-load can be used under tensile loads (these tensile forces
must be less then the pre-load, given in the data sheet)
Please note that the acceleration of the ceramic material (e.g., caused by fall
down, discharging or high dynamic application) will occur.
After excitation of the actuators by a voltage in the upper control range, the
ceramic will move and generate an opposite high voltage after disconnection.
Heating of the ceramic material will occur during dynamic operation and is
caused by structure conditional loss processes. This may cause failure if the
temperature exceeds specified values cited below.
With increasing temperature, up to the Curie temperature (usual values
approx. 140°C - 250°C), the piezoelectric effect disappears.
Piezoelectric actuators such stacks or various tables work electrically as a
capacitance. These elements are able to store electrical energy over a long
period (up to some days) and the stored energy may be dangerous.
If the actuator remains connected to the drive electronics, it is unloaded
within a second after shutdown and quickly reaches harmless voltage values.
Piezo-actuators can generate voltages by warming or cooling only (caused
by the longitudinal change). The discharge potential should not be ignored
due to the inner capacitance. This effect is insignificant at usual room
temperature.
Piezo-actuators from piezosystem jena are adjusted and glued. Any
opening of the unit will cause misalignment or possible malfunction and the
guarantee will be lost.
Please contact piezosystem jena or your local representative, if there are
any problems with your actuator or power supply.
