Propuesta de implementación de un prototipo automatizado para el control de nivel de anolitos para la planta de pintura Ciauto Cia. Ltda.

Abstract

This graduate research aimed to implement an automated prototype to control the level of anolytes in the Ciauto paint plant. The prototype consists of a panel and a Human-Machine Interface (HMI) to control two systems: demineralized water (DI) and soft water. The first DI water system allows for the control of analyte levels based on the conductivity variable. Two modes are considered for the activation and startup of the DI system: automatic and manual. It consists of six stages: the first one delivers the necessary voltage to power the control and protection devices. The signal acquisition stage, composed of level and conductivity sensors, enables the on/off control of the pump and the opening/closing of the solenoid valves. These signals are sent to the processing stage, whose main element is a PLC-LX3V responsible for sending and activating output signals based on the control process's stage-transition grafcet. Consequently, it activates the power stage pump, producing water circulation. The control and visualization of the system states are carried out through an HMI-LEV12070D panel. The final stage enables RS-485 communication between the processing stage and the HMI. The soft water system has stages similar to those of the DI system. As a result, it was determined that the communication maintained a response time of 1 ms without data loss and with coherent responses to commands executed from the interface. Therefore, it is concluded that the HMI provides a user-friendly design for efficient control of conductivity levels in the analyte tank. Implementing a SCADA system for better process control is recommended.