Process to control a piezo-electric device using a control unit with a final stage making comparison of difference between emitted control signal and response

摘要

In a process to control a piezo-electric device using a control unit with a final stage, the end-stage emits a signal to the final stage and the final stage emits a responding signal to the end-stage. A comparison is made of the difference between the emitted control signal and the response, thereby detecting a fault if any.