Diseño de un sistema de control de temperatura para los hornos de termoformado de la máquina de láminas P7 de Techoluz en Tubasec C.A.

Abstract

Reducing the temperature variation to ± 3 °C with respect to the set-point temperature in the thermoforming ovens of the P7 plastic laminating machine was a necessity of the TUBASEC C.A. company in Riobamba. The document details the implementation of a temperature control system for thermoforming ovens in the TechoLuz production plant. The investigation was based on the acquisition of data of the oven tested with a step-type test. After that it was used graphical methods implemented in Matlab program for the identification of the transfer function in the oven. A Proportional Integral Controller (PI) was designed using the transfer function. The implementation of the controller was performed using a virtual instrument programmed in LabVIEW. It interacts with the monitoring and control system of the machine (SCADA). To generate the output voltage, the AC-AC converter concept was used per integral cycle. When performing the respective tests of the control system, a final temperature variation of ± 2 °C was obtained with respect to the set-point temperature. It is concluded that the dimensional characteristics of plastic films improved. It is recommended to design an AC-AC converter to customized resistive load.