SPEED CONTROL OF MOTORS BY ALGORITHM PWM WITH PLC S7 1200 AND DRIVE ATV310
Keywords:
Abstract
In the field of automation, the production lines require speed to be changed flexibly and accurately. Any unwanted speed changes will cause great economic losses due to the manufacturing process producing many defective products. Therefore, controlling the dynamic speed is an important task of factories. This study aims to design a motor speed control system using a combination of devices including programmable logic controllers and drives through the PLC's analog signals. The paper uses pulse width modulation algorithm in PLC S7 1200 to control three-phase asynchronous motor speed flexibly. The motor speed is adjusted by inputting the percentage values of the pulse width on the monitor screen. Through experimentation, the motor speed control system is implemented flexibly, accurately and efficiently. In addition, the system also has the ability to control the engine reversals, collect parameters on speed, frequency, display results and monitor control on the interface screen. This study provides an optimal solution for motor speed control, helping to improve the efficiency of the automation system in production, effectively serving the production process as well as in the PLC training work.
