Microcontroller-based invertors including a decentralized process control

Due to the increasing automation of industrial plants, more and more inverter-fed electrical drives are demanded which are able to fullfil decentralized tasks of plant-specific process control in addition to their drive-specific functions. This makes these inverters part of a distributed process control. In order to achieve an economical and suitable industrial solution, a microcontroller-based process control module has been designed which is implemented into the inverter and used for processing application-specific process control functions. This module is linked to the microcomputer of the drive control as an intelligent peripheral circuit. This system is especially suitable for fast real time applications. A winder control and a position control have been developed as typical applications for this process control module. The winder control allows open loop tension control with acceleration and friction compensation as well as closed-loop tension or dancer position control. The position control has a highly dynamic performance due to a fast position control loop with short cycle times