Automatização do sistema de accionamento e controlo de motores de indução trifásico de média tensão na empresa Açucareira de Xinavane, SA.

Abstract

This internship report focuses on the proposed automation of the drive and control system for medium-voltage three-phase induction motors at the company Xinavane sugar mill, SA, which are responsible for the sugarcane preparation process. Currently, the system relies on outdated technology, using relays and contactors that do not allow for remote diagnostics or integration with the factory’s central control system. This leads to frequent failures, prolonged production downtime, and high operational costs. The proposed solution involves replacing the existing system with an automated system using a Programmable Logic Controller (PLC), specifically the Allen-Bradley MicroLogix 1400, enabling remote control, real-time monitoring, event history access, and faster fault response. Technical analysis showed that the proposal meets the company’s operational requirements by improving process reliability and safety. The economic assessment revealed that, despite the initial cost of approximately 148,303.62 MZN, the solution provides significant return by avoiding losses due to production downtime, delivery delays, overtime payments, and corrective maintenance. Therefore, the project proves to be a viable and sustainable alternative to ensure the continuity and efficiency of the company’s production process.