4. instructions for using piezo electrical 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 piezo electrical 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 a 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.
•
The piezoelectric effect disappears at temperatures above the Curie temperature
(usual values approx. 140...250°C).
•
Piezoelectric actuators such as stacks or other devices work electrically as a
capacitor. These elements are able to store electrical energy over a long period of
time (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 use only original parts from
piezosystem jena
.
•
Please contact
piezosystem jena
or your local representative, if there are any
problems with your actuator or power supply.
19
piezosystem jena GmbH
Pruessingstrasse 27 • 07745 Jena
