Software design of a Human Machine Interface device

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Scherer Balázs Attila
Department of Measurement and Information Systems

A significant amount of the world’s electrical energy is consumed by electrical motors used in industrial applications. To reduce the consumption, companies are starting to use modern, intelligent variable-frequency drives (also called AC drives or inverter drives). Such a drive is in development at Hyundai’s research center in Hungary, where both the power system and the controlling software are made.

To manage the variable-frequency drive, an operator interface is often placed on the front of the VFD device, or connected by cables and mounted a short distance away. The operator interface, or human-machine interface provides a way for an operator to modify the motor’s behaviour.

The interface has a graphical display and a keypad, the functions and parameters can be reached through a menu system. My thesis is about the implementation of the operator interface’s software, including the creation of data structures, the realization of the communication between the drive and the interface, the user interaction management, and the data visualization.


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