DIAGNOSTIC METHOD FOR A POSITIONING DEVICE AND POSITIONING DEVICE WITH A DIAGNOSTIC DEVICE

摘要

In a diagnostic method for a positioning device of a process plant, such as a chemical plant, a food processing plant or the like, which includes an actuator (e.g. pneumatic or electric actuator) with a drive shaft and a positioning armature, such as an actuator valve, with a positioning shaft, the drive shaft and the positioning shaft being connected to one another in a rotationally fixed manner (e.g. by a detachable coupling interface and/or a positive-locking torque coupling, such as a claw coupling), a first measurement signal is detected during a movement of the drive shaft, and the first measurement signal or a derivative of the first measurement signal is evaluated with respect to a step-like change in order to detect a rotational backlash.