随着我国城市建设事业的高速发展.电梯与人们的生活和工作形成了越来越密切的关系。电梯的安全可靠性也就为人们日益关注。电梯在运行过程中由于停电、缺相及电器控制系统故障造成未到达平层位置停车,乘客被关在轿厢中的事情时有发生。目前国内电力紧张,电器元件质量不过关,日常维 With the rapid development of China’s urban construction industry, elevators have become more and more closely related to people’s lives and work. The safety and reliability of elevators has also become an increasing concern for people. During the operation of the elevator, due to power outages, phase failures, and failures of the electrical control system, the elevators did not reach the leveling floor to park. Occasionally, passengers were trapped in the car. At present, domestic power is tight, but the quality of electrical components is not enough.