light industry

一、introduction
The construction hoist is an important construction equipment indispensable modern high-rise construction with large tower crane. Especially in high-rise, high-rise building construction as a very important task, to ensure the construction period and safety, reduce construction costs, reduce labor intensity plays an irreplaceable role. At the same time is also an important symbol of the level of building equipment. According to the general experience, each of the tower with a high tower crane at least one construction lift. This paper introduces a good performance and energy saving effect of Yi Fei AC60 inverter in construction elevator brings.

   

二、Brief introduction of general lift construction
1, control system
The control system is the key part of the construction hoist, which determines the performance of the whole machine. Ordinary lifts up, down, shutdown function is realized by the relay - contact device control, but a single speed, start and brake of the impact of large, structures and institutions more serious damage, electrical components also easy to damage and running speed is relatively low, not only affects the construction speed is also influence the efficiency of construction enterprises. If the speed is simply increased, the acceleration is too large, the structure and the mechanism of the impact is too large to speed up the gear rack and brake disc wear, thereby reducing the reliability of the operation.
2, starting and braking system
Ordinary lift starting is to take direct starting or star delta reduced voltage starting, the impact is very large, for the motors and electrical components caused serious damage, and elevator inside the material is easy to drop, especially some builders lifts there by man. There is a great security risk. Ordinary elevator brake is the use of mechanical brake braking force, elevator suddenly from high speed down to zero speed, due to the inertia effect, not only on mechanism and structure damage and elevator inside the material is easy to drop, there are certain security hidden danger.

 

三、Advantage of frequency conversion system

1, soft start
Compared to the power frequency starting mode, the inverter control can reduce the vibration and impact of the mechanical part, save the maintenance cost for the user, and the operation is stable.
2, smooth braking
With the braking unit, braking smooth and precise, no "car" phenomenon.
3, high starting torque
Using high performance control mode, the torque can be adjusted, and the low frequency band can provide stable high output torque.
4, security
The advanced modern AC variable frequency speed control technology carries on the transformation to the hoist electric drive system. The motor to achieve a smooth operation, improve operational efficiency, improve the overload operation, eliminate the impact of brake, reduce electrical maintenance, reduce electric energy consumption. At the same time, the protection of over current, over voltage, under voltage and input phase, and frequency converter over temperature, overload, motor fault protection and so on. The stepless speed regulating technology effectively solves the transmission impact of the mechanism, and extends the service life of the gear, the roller, the bearing and the gear rack. As the frequency conversion system has the function of limiting current, reducing the impact current of the power grid when the motor starts, and the mutual influence of the electric equipment is alleviated, and the cable current carrying capacity is greatly improved. Power supply cable does not need to increase, compared with the ordinary speed lift, but can be reduced. The cost is saved, and to create a convenient retractable cable.

 

五、Concluding remarks
The Yi ChuangFei ECF200 inverter to lift the electric drive system for technological transformation, not only to enhance the the safety and the reliability of the equipment, in the starting and stopping process, almost do not feel to impact between mechanical system, greatly improving the stability during the operation of the elevator and comfort, but also for social enterprises and save large amounts of electricity, which greatly improves the work efficiency.