Research On Application Of Siemens 6RA70 Full Digital DC Speed Regulating Device In The Rolling Mill

As we know, control engineering in the development of science and technology and engineering process, plays a particularly important role. Its main research process is to use control theory and technology, to meet and realize modern industry, agriculture and other areas such as social economy is widely used in the automatic and intelligent demand gradually.At this stage of the world’s economic development, has been intertwined two obvious, that is energy and the environment. Nervous energy not only restricts the considerable economic growth in developing countries, also bring quite a big problem to many developed countries. The world is often the focus of area concentrated energy. The development and utilization of energy and greatly affects the protection of the environment. In fact, the global temperature is higher and higher, acid rain, and a series of caused by environmental disasters are related to the development and utilization of energy.At present, the domestic research of dc speed regulating system is very active, but want to form industrialization is not very ideal, foreign companies still occupy a lot of market share. So, if you want to make the domestic dc speed regulation system to get the larger development, requires a comprehensive understanding of dc speed control technology development trend of the international and domestic market demand.Applications in industrial production process is very extensive, one of the electric drive system of dc double closed loop speed regulation system, widely used in rolling mill, printing, machine tool cutting and a lot of need in the field of automatic control. It in the computer as a tool of simulation system is applied not only to save money, and safety, cycle short, quick effect.In recent years, although the ac speed regulation system has developed quickly, however, dc speed control system has a mature theory and practical application, and from the feedback closed-loop control the direction of observation, it is the basis of ac speed regulating system, so the dc speed control system plays an important role in the production and living.In modern industrial production, mainly for the drive motor is the main equipment. In the industrial production of all kinds of high precision, reliable working condition, high precision of speed control, in particular, is not affected by environmental conditions such as temperature, at the same time self-tuning parameters, such as automatic fault alarm, fault memory function, and can provide users with convenient for use and maintenance of the speed regulation system has become the hot today. And the combination of computer and dc double closed loop speed regulation system, just have the characteristics of the above. Therefore, we can see come out, it will have an irreplaceable advantage.Dc speed control system of double closed loop, current loop and speed loop) control is a kind of current application is very broad and economy of power transmission system, it not only fast dynamic response, and the special anti-interference. Green steel group, the third of high speed wire plant of motor is used in the main Ga Xian whole equipment is the series of Siemens 6 ra70 rectifier, through PROFIBUS communication, realize the rolling mill speed cascade control. Siemens 6 ra70 series rectifier is suitable for double closed-loop dc speed regulating system, the realization of the positive &negative operation can be frequently can also realize power reverse conversion, and can run in four quadrant.