Specifications

E-500/E-501 Series PZT Servo Controllers User Manual PZ 62E
Release 2.15.1 www.pi.ws Page 64
10. Appendix
10.1. Lifetime of PICMA® Actuators
The following factors which can have an impact on the actuator lifetime must be taken into
consideration: Applied voltage, temperature and relative humidity.
The effect of each individual factor on the lifetime can be read off the diagrams shown
below. The lifetime calculated in hours simply results as the product of all three values read
off the diagrams.
The impact that the applied voltage has, is particularly important. With decreasing voltage
the lifetime increases exponentially. This must always be taken into consideration in an
application. The recommended maximum range of the control input voltage for the E-
500/E-501 system therefore is -2 to 12 V, resulting in a piezo voltage range of -20 to 120 V.
A control input range of -3 to 13 V is possible (results in -30 to 130 V piezo voltage), but will
reduce the actuator lifetime accordingly.
Fig. 34: Interdependency between the mean MTTF of a PICMA® actuator and the value of
the voltage applied
Fig. 35: Interdependency between the mean MTTF of a PICMA® actuator and the ambient
temperature
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