Diseño e implementación de un Sistema Scada para el control de nivel y temperatura del tanque de agua caliente de la Planta de Procesos Análogos (Ppa).

Abstract

The laboratory specialized system highly automated of the Universidad Distrital Francisco José de Caldas, Facultad Tecnológica, located in the town of Ciudad Bolívar (Bogotá-Colombia), has a didactic plant that receives the name of plant of similar processes (PPP), which was developed by the students for the field of process instrumentation II of the engineering program in Control. The PPA aims to provide theoretical and practical learning materials focused on industrial processes, automation, instrumentation, control and areas at the end. It has a control panel, two actuators, three tanks, hydraulic connections, electrical connections and a frame. Tank of hot water of the PPA does not have elements to measure the variables of temperature and level, nor has a medium that allow application control algorithms for adjustment and manipulation of the process that you want to emulate. Understanding the need to control, monitor the level and the temperature of the tank of hot water of the PPA, were selected and installed industrial sensors that allowed the identification and modeling of tank experimentally using parametric methods, using the MATLAB software and data obtained experimentally, was obtained the mathematical expression which allowed graphically observe the behavior of the system. Then was made the tuning of control loops, control strategy for variable temperature developed was ON_OFF and for the variable level PID, which were implemented in the controller programmable logic (PLC) "Allen-Bradley 1769 L23E QB1B" and with a graphical interface on screen HMI (Panelview plus 600 Allen-Bradley) for monitoring and modifications of the process variables. The system is subject to future modifications that could be the implementation of controllers based on intelligent systems and allowing comparison with conventional control systems for the development of practices. This work emulates a basic process of two variables (level and temperature) in the hot water tank of the PPA, through the development and implementation of a system of control, supervision and data acquisition (SCADA) that allows control of the variables using an HMI screen.