Temperature Control in a Closed Space Environment by using a PLC

Abstract

The paper presents a digital system for temperature control in a closed space with a volume of 4 dm3 using a PLC (programmable logic controller), type Twido TWDLMDA20DRT, manufactured by Telemecanique. The aim of this paper is to implement a digital PI controller and determine its parameters in a temperature control system. A laboratory model of the system was created, which, in addition to the PLC, consists of: a 4 W light bulb, a diode as a temperature measuring element, and an operational amplifier for adaptation to the PLC’s analog 9-bit input. The analyzed process can be described by a first-order transfer function, which describes most industrial processes. One of the well-known procedures for determining the sampling time was applied in the paper. Technical optimum was used to determine the parameters of the PI controller. Good indicators of the regulation quality of this system were confirmed by experiments.

Dinko Vukadinović

Full Professor | Department of Power Electronics and Control

Full professor at the Faculty of Electrical Engineering, Mechanical Engineering, and Naval Architecture in Split, specialized in modern control systems for power electronic converters, electric motors, and generators. At the Power Electronics Research Laboratory, he leads experimental projects and develops advanced methods for regulating electrical machines and converters, while supervising doctoral research in these areas.

Mateo Bašić

Full Professor | Department of Power Electronics and Control

Full professor at the Faculty of Electrical Engineering, Mechanical Engineering and Naval Architecture in Split, with recent research interests related to the fields of power electronics and renewable energy sources, with a special focus on energy-efficient control of inverters, battery systems, wind turbines, photovoltaic sources and self-excited induction generators in microgrids - both in island operation and in grid-tie operation.