外文文獻翻譯plc控制下的電梯系統(tǒng)-文庫吧資料
2024-12-14 05:20本頁面
【正文】 原文： 題目 Elevator System Based on PLC Composed by the order of relay control system is a realization of the first elevator control method. However, to enter the niies, with the development of science and technology and the widespread application of puter technology, the safety of elevators, reliability of The increasingly high demand on the relay control weaknesses are being evident. Elevator control system relays the failure rate high , greatly reduces the reliability and safety of elevators, and escalators stopped often to take with the staff about the inconvenience and fear. And the event rather than taking the lift or squat at the end of the lift will not only cause damage to mechanical ponents, but also personal accident may occur. Programmable Logic Controller (PLC) is the first order logic control in accordance with the needs of developed specifically for industrial environment applications to operate the electronic digital puting device. Given its advantages, at present , the relay control the lift has been gradually replaced by PLC control. At the same time , AC variable frequency motor speed control technology ,the way the lift drag speed has been a gradual transition from DC to AC frequency converter. Thus , PLC control technology increases VVVF Elevator modem technology has bee a hot industry. 1. PLC elevator control advantages (1) used in elevator control PLC, with software for automatic control Of lift operation, reliability greatly increased. (2) layer was removed and a majority of the relay, the control system structure is simple , to simplify the external circuit. (3) PLC can be a variety of plex control system , easy to add or change control functions. (4) PLC can be automated fault detection and alarm display to improve the operation of security and ease of maintenance. (5) for the group control the allocation and management , and improve the efficiency of elevator operation. (6) do not need to change the control scheme changes when the hardware connection . 2 .VVVF elevator control characteristics With the power electronics, m
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