No machine room elevator control system due to the technical characteristics of MRL no room, so it's elevator control system and the general should have greater flexibility, convenience and reliability compared to. 1) Flexibility. To facilitate the electrical wiring, elevators without machine room control cabinet is usually placed in a position close to the drive host, there are three main forms: when one driver installed in the host when the top part of the shaft, the control cabinet door on the top floor and the layer made of Siamese type; the second when the driver installed in the host when the hoistway pit site mall escalator decoration, and made between the control cabinet on the bottom of the car and the shaft wall-mounted shaft wall; the third when the driver installed in the host shaft wall opening space , the control cabinet on the same hole and made portable. Elevator door system failure highlights the close button is pressed, the door is not shut. Maintenance and troubleshooting methods: ① close button AGM contact failure or damage double escalator decoration, shorting two o'clock check measuring 23, 24, and repair or replacement; ② three closing limit switch 3GM damage that can not be closed relay JGM was electric elevator can not be closed, check the measured short 28,01 points, to close, indicating 3GM damaged, replace 3GM; ③ closed relay JGM damage escalator decoration, replacement JGM; ④ start open relay 1JQ damaged, the normally open contacts remain 1JQ Disconnect elevator decoration, JGM can not have electricity, and therefore can not close the door, replace the relay 1JQ. The elevator has accepted the selected layer signal, door closed, but you can not start. Escalator Decoration | Gunton metal products (certified) | Shanghai escalator decoration provided by the Chongqing Municipal Gordon Metal Products Co., Chongqing Gordon Metal Products Co., Ltd. (www.cqgaodun.com) is Chongqing Municipality, lifts and accessories leader over the years, the company implement the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. Gordon Metal Products in leadership with the staff warmly welcome all inquiries negotiations to create Gunton metal products a better future.