The Application And Realization Of Water-Cooled Magnet Control System

Magnetic phenomenon is one of the basic phenomena matter. Like very low temperature and high pressure, high magnetic field is considered as the most important extreme condition for modern scientific experiments, and it can offer new ways for researching in physics, chemistry, materials and biology and play an important role in discovering and understanding the new phenomenon or revealing the new rule. Since the first half of the 20th century, the major Western countries have poured a huge amount of money and people into research and development with magnet, and now there are four high magnetic field laboratories in the United States, France, the Netherlands and Japan. With the support and promotion of high magnetic field experimental platform, these countries have made a large number of world-class research results in the foundational subjects. January 25, 2007, the National Development and Reform Commission officially approved the building of a high magnetic field experimental project.There are water-cooled magnets and hybrid magnets in the high magnetic field laboratory. The main purpose of water-cooled magnet control system is to complete the process of magnet experiment by controlling power switches and valves, provide the communication interfaces between central control system with power system, deionized water cooling system and safety protection system, and then adjust and monitor the water and electricity.The paper studied and analyzed the structure and function of the water-cooled magnet control system of the U.S. high magnetic field devices and the distribution of Hefei high magnetic field devices, the distributed control system (DCS) technology was chose to use.The structures of power system, deionized water cooling system, magnet system, and safety protection system were researched to get the specific functional requirements of water-cooled magnet control system. The relationship of control or communication and the interface, which between the water-cooled magnet control system and the others were get clearly.With using Siemens process control system PCS7, the solution of water-cooled magnet control system's structure was made. The hardware and software selection and design work of system network, field bus and monitor stations were completed by depending on their own features.The process of magnet experiment was researched and developed, the sequence control in normal state and exception handling in fault state of water-cooled magnet control system was designed completely. The reliability of control system was discussed, and it was enhanced by using hardware redundancy and software fault tolerance. All factors which would affect the reliability of experiment were classified, the real-time response capability of water-cooled magnet control system against different kinds of fault was evaluated.Finally, the software of water-cooled magnet control system was designed, and the achievement methods and functional tests of communication block, control block and the sequence control chart of experiment were described.