Integrated VSD-PLC-HMI Based Speed Control System For Three-Phase Induction Motor In Vertical Drive Applications

Abstract

This study presents the design and implementation of a speed regulation system for a three-phase induction motor using a Variable Speed Drive (VSD) integrated with a Programmable Logic Controller (PLC) and Human Machine Interface (HMI). The system was developed to address the limitations of previous studies, which focused primarily on soft starting or braking functions without real-time control integration. The proposed system enables soft starting, precise speed regulation, and voltage control through real-time frequency adjustments. Under experimental testing, the motor achieved a stable speed of 1500 RPM at 50 Hz, with startup current limited to 0.94 A under no-load and 1.3 A under load conditions. Voltage output was consistently linear, reaching up to 381 V (no-load) and 369 V (with load), indicating reliable performance across the frequency range. Compared to earlier works, this system demonstrates improved integration and feedback responsiveness, making it suitable for industrial applications that require efficient and adaptive motor control.