优化电梯控制系统：基于PLC和变频器的解决方案研究

ontrol technology, and power electronics technology have developed rapidly. Elevators have become a symbol of urban material civilization. Especially in high-rise buildings, elevators are indispensable vertical transportation equipment. The traditional relay elevator control system, due to the large mechanical and electromagnetic inertia of the relay itself, greatly reduces the reliability and safety of the elevator system. In order to ensure that the elevator operates efficiently, energy-saving, and safely, it is necessary to improve the elevator control method. Developed for the needs of sequential logic control, the programmable logic controller (PLC) is a digital electronic device designed specifically for industrial environment applications. PLC has fast processing speed, high reliability, and can ensure the elevator operates normally, safely, and reliably. Furthermore, with the development of AC motor variable frequency speed regulation technology, the driving method of elevators has gradually transitioned from DC speed regulation to variable frequency speed regulation. This can not only meet passengers' comfort and ensure smooth precision but also reduce energy consumption, save energy, and reduce operating costs. This paper applies the variable frequency speed control method based on PLC to the elevator system and conducts research on this method. The key words: elevator; programmable logic controller; variable frequency drive.