【 Weak current College 】 elevator retrofit---Power By 【 China power house network 】

As with most of the electrical machinery and equipment, in order for the elevator in common shipping rush and have a good run state requirements appropriate to the elevator and regular maintenance, cleaning, adjustment, replacement parts, and make regular checks on safety. 　　It is generally believed that for high-rise high-speed elevator traction machine (including DC with teeth and DC gearless type) of the service life of 40 years, but in order to enable the machine to keep modern style of composition, the requirements for the elevator on a regular basis. 　　View existing theories and motor control circuit is out of date was not unreasonable. 　　Just want to control the building of computers, communications equipment, digital network system, personal safety and rescue equipment and control facilities to prevent use of new technology, but also to an existing Outlook continuously amazing change. Renovation of the so-called elevator recommend following on in the elevator of the improvement programme. ① new group control issued directives control;
② new motor and operation control;
③ new static power conversion devices;
④ new door closed bodies;
⑤ new signalling devices;
⑥ new long-distance monitoring devices;
⑦ new car interior decoration. For most of the elevator tends to improve management and motor control, economic reconstruction. 　　In several instances, and today the sale of new products, in fact the old elevator also has its advantages. In traction and elevator structure unchanged, after the renovation of the lift is in use, more often than the new acquisition of elevator more resistant to heavy loads, more durable. In the United States, currently new acquisition cost of a lift to 150 000 ~ 225 000US $ (equivalent to 15 ~ 22.5 millions of yen), and for certain building owners, if you decide to update the lift facilities in the economy, have an obligation to try to protect the initial investment for the elevator. 1 why elevator renovation affected by today's socio-economic competition and availability rate of building owners, if not the current transformation of the old building with modern equipment of the building, you have failed in the competition. 　　On the building of the lessee, for a obsolete electrical, mechanical and rescue appliance often have grievances, not even to the end of the term on the left. When there are some situations, the landlord should consider building elevators for a renovation. ① calls increased number of failure, equipment failure, increase reliability, reduce;
② by elevator accident resulting from an increase in passengers tripped, and the car door of collision accidents increased;
③ wait time, building the dissatisfaction of the lessee and passengers;
④ has been running for 10-15 years old control devices;
⑤ maintenance contract to a sharp increase in the cost;
⑥ original elevator manufacturer and installation companies have been revoked;
⑦ based ADS (United States cripple measures Act) and for improvement of requirements specification is too high;
⑧ recently building lessees type changes, share, density changes, etc.;
⑨ the lessee to more modern buildings move out. 　　Because of the elevator after renovation not only to reduce the wait time, improve reliability, increase the tenant satisfaction, but also can save energy and reduce maintenance costs. Therefore, the existing elevator update is called and the times, will make people feel satisfied. On the other hand, elevator construction should give the following updated price: ① 1 elevators take approximately 65 000 ~ 100, 000US $ (equivalent to 650 ~ 10 million yen). 　　② elevator outage time is about 10 to 12 weeks (about 2.5 ~ 3 months). ③ to elevator update period, will reduce the building consumer service level. To do this you must consider, as the elevator reconstruction of dispersed customer or over to use the new elevator equipment building, these always affect elevator reconstruction of decision-making. 　　2 renovation projects renovation of the elevator is out of adjustment, the superposition principle. The first update is to keep the original issue management, creation of new group control management issued directives control devices; and as comprehensive renovation, you should group control and operation control. Elevator update releases of most, still use the original DC geared and gearless traction machine. 　　The reason for the traction machine wear and deterioration of the State was not serious, economic considerations, but also do not have to replace the new product. 3 traction principle from the elevator, the main rope bearing the cabin and on the role of the DC motor, the settings in the engine room of the sheave drive the car and the upper and lower weight. DC gearless machine, the worm gear pair or helical gear reducer set consisting of the motor and the rope round, in order to ensure the elevator operation and pass the necessary torque and speed. DC gear elevator operating speed is 1 ~ 2.25m/s. DC gearless machines have the rotor with DC motor directly coupled driving pulley, and DC gearless elevator machine, run smoother than, more efficient and low noise. 　　DC gearless elevator generally applies to high-rise building high-speed elevator speed 2.5 ~ 10m/s. 　　Whether DC gear or DC gearless type, are equipped with spring and electrical release DC brake, the actuator cannot be guaranteed in the case of a power outage, speeding or emergency stop ramp run stop respectively actions make. 　　Since the traction machine more durable, renovation in the elevator when still use, but only need to be improved to increase the small speed and location detection device, with microprocessor control system for new, used for feedback of actual traction speed and destination location. Recently the United States several construction company has introduced the application of the "gear", the part about the original DC gear type tractor replaced the AC induction motor VVVF, packed in the original worm gear pair traction machine tachogenerators feedback to a new set of AC induction motor. Because the DC gearless motor and tractor into one type, when DC gearless type AC VVVF-instead, you want to removeDC gearless type change on AC VVVF device and not for some installation modifies this is not possible, this replacement program in Japan only by the number of elevator manufacturers, the pilot raised the following grounds 2 points. ① Japan elevator manufacturer has stopped producing DC elevator (Japan firms are determined to produce AC VVVF lift). ② by Japan's habits, in the elevator and renovation plans often on other company's product is the attitude taken exclusion. 4 issue directives and elevator control system elevator is located in the control cabinet, which operates within the engine room motor control circuit and issued a directive logic circuit, car call handling, safety devices, stop, loop, Office car door closing devices circuit, load detection circuit, stations and car door protection circuit and various time relays, etc. But the elevator control devices can be networked to all the above circuit, and with the main group control issued directives control the mutual transfer information. 　　Group control issued directives control includes elevator group control operation of the input signal of accept, keep and logic processing. The control unit and external call signal requires rapid response and issued to the elevators. At present there are computer operation features of the latest issued a directive to the configuration into the appliance, the elevators of the logical operation features and the elevators control device directive issued group Canal control device. These devices can communicate with multiple communication network. Thus, the original relay control with microprocessor-based operation instead of issuing directives control mode, you can shorten the response time of about 30% to 40%.