Generating jam protection signal involves generating signal depending on comparison of detected drive output signal and model signal representing computed output signal of drive

摘要

The method involves generating a jam protection signal depending on a comparison of the detected output signal and a model signal representing a computed output signal of the displacement drive. The model signal is computed on the basis of a control signal applied to the drive. A second jam protection signal can be computed from a comparison of a predetermined demand value and the output signal. Independent claims are also included for the following: a jam protection device.