Elevator installation quality verification of Frequently Asked Questions 1, the limit switch is installed to protect the position of the counterweight with the process and test elevator hoisting and Dun bottom is one of the elevator malfunction, though not common, but once there, be able to ensure that the motor promptly stop, GB7588-1995 "elevator manufacturing and installation safety norms" provides elevator limit switch should be set. Because it does not expressly provide for the installation location, formed from different manufacturers have different design and installation requirements. GB 10060-93 acceptance of existing Article 4.6.5 Action test specified upper and lower limits: Set in the limit position protection switch sightseeing elevator shaft upper and lower ends of the price, it should be in the car or on the front bumper re-contact work, and in buffer its operating state is held during compression. The emphasis here before touching buffers work, its purpose is required before the buffer is compressed cut off the electrical power supply, the brake is closed in order to ensure the car stopper. Section 4.5.1 also provides: a car at both ends of the station leveling position, the car, hit the plate distance counterweight buffer between the top surface (here with S1, S2 shown) elevator maintenance, energy-consuming buffer should be 150 ~ 400mm, energy storage buffer should be 200 ~ 350mm. Such as single elevator, on-site installation stage reached on this test projects requirements should be easy. Special elevator safety device (3) electrical fault protection. According to the provisions of the AC power supply phase sequence protection should lift elevator factory, the motor is connected directly to the power supply and lighting circuits should short-circuit protection, the motor is directly connected to the power supply should have overload protection. (4) electrical safety devices. Electrical Safety features include: Direct drive off the mains contactor or safety relay contacts; do not cut off the contact directly or safety relay contacts and does not meet the security requirements of the contacts of electric shock. But when the elevator electrical equipment failure, if no voltage or low voltage; wire interruption; insulation damage; element short circuit or open circuit; relay and contactor does not release or does not suck and; contacts continue to open or not closed; off with the wrong equal electrical safety devices should be able to prevent a dangerous state elevator. Elevator Maintenance Company | Gunton metal products (certified) | Sichuan lift provided by the Chongqing Municipal Gordon Metal Products Co., Ltd.. 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.