The control system of a 2kW@20K helium refrigerator

Cryogenic Engineering Conference 2017

材料科学;物理学

Pan, W.^1 ; Wu, J.H.^1,2 ; Li, Qing^1,2 ; Liu, L.Q.^1 ; Li, Qiang^1

State Key Laboratory of Technologies in Space Cryogenic Propellants, TIPC/CAS, Beijing

100190, China^1

University of Chinese Academy of Sciences, Beijing

100049, China^2

关键词: Aerospace products;    Configuration software;    Control architecture;    Control strategies;    Cooling capacity control;    Helium refrigerators;    Industrial monitoring;    Real time monitoring;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/278/1/012087/pdf
DOI  :  10.1088/1757-899X/278/1/012087

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

The automatic control of a helium refrigerator includes three aspects, that is, one-button start and stop control, safety protection control, and cooling capacity control. The 2kW@20K helium refrigerator's control system uses the SIEMENS PLC S7-300 and its related programming and configuration software Step7 and the industrial monitoring software WinCC, to realize the dynamic control of its process, the real-time monitoring of its data, the safety interlock control, and the optimal control of its cooling capacity. At first, this paper describes the control architecture of the whole system in detail, including communication configuration and equipment introduction; and then introduces the sequence control strategy of the dynamic processes, including the start and stop control mode of the machine and the safety interlock control strategy of the machine; finally tells the precise control strategy of the machine's cooling capacity. Eventually, the whole system achieves the target of one-button starting and stopping, automatic fault protection and stable running to the target cooling capacity, and help finished the cold helium pressurization test of aerospace products.