Implementation of IoT on PLC-Based Induction Motor Speed Control

The application of IoT to induction motor speed control systems is an opportunity to digitalize the manufacturing industry to make it more efficient and produce quality products. Generally, digitalization in the manufacturing industry uses a very expensive PLC-based SCADA. In this research, we innovated a more economical digitalization of the induction motor speed control system using a PLC connected to the ESP32 via Modbus TCP/IP and IoT platform Thingsboard via the MQTT protocol. Apart from that, the control system in this research is a closed-loop system so that the speed of the induction motor will always be constant even if a varying load is applied. The system controller uses a proportional-integral (PI) controller. On the IoT Thingsboard web, in real-time, every 10 minutes, displays data on current values, voltage, and speed. As a result, the digitalization of the induction motor speed control system functions well. This is proven by the real-time data displayed on the Thingsboard screen, updated every 10 minutes. The best controller parameters are P=20 and I=12. With this PI value, when there is a change in load, the time required for the system to return to its initial speed is 24 seconds.