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目前,国内大部分20世纪80~90年代安装的住宅电梯,控制部分多是继电器控制,线路复杂,节点接线多,故障率高。调速方式一般采用变极调速,调压调速,直流调速,属于能耗型调速,且调速性能较差,严重影响了电梯的安全运行质量。但更新此类电梯需要大量的资金,现实有很大的困难,因此造成电梯带病运行。而利用PLC和变频器对老旧的住宅电梯进行局部改造是经济可行的。不但可以增加电梯的安全性和可靠性以及乘坐的舒适感,而且降低能耗,减
At present, most of the domestic residential elevators installed in the 80’s and 90’s of the 20th century in China are mostly controlled by relays. The wiring is complicated with many nodes connected and the failure rate is high. The speed control mode generally adopts pole speed control, voltage speed control and DC speed control. It belongs to energy-saving speed control, and the speed regulation performance is poor, which seriously affects the safety operation quality of the elevator. However, updating such elevators requires a large amount of money and the reality is very difficult. As a result, the elevator runs ill. However, it is economically feasible to use PLCs and frequency converters to locally transform the old residential elevators. Not only can increase the safety and reliability of the elevator and comfort of ride, but also reduce energy consumption, reduce