| This paper aims at some key techniques for improving the electrical control system on B220 (2x6M) frame planer in order to increase the equipment efficiency and decrease productive cost. A new D.C. motor speed regulating method is given in this paper, i.e. two sets of 60 KW D.C. motors can be controlled by a full digital and high-power D.C. regulator, the travel position can be digitally controlled through the man-machine interface technology, the speed feed-back signal can be obtained by means of encoders, a close-loop speed control system can be formed through rational composition of the PLC and full digital D.C. regulator and, therefore, the large-typed and high-power frame planer can be updated rationally, increasing its reliability and operation capability. In the study the operating principle of the close-loop system has been analyzed, the research on control features of the frame planer has been made, the control logic diagram & the control program have been set up. The study has offered the speed regulation close-loop control block diagram, optimized the elements that the system needs to eliminate the non—linear characteristics, element's over-heat, etc. in the previous updating process and to meet the control needs of the frame planer. The study has also offered a rational principle to select strong power electrical elements on the basis of price/characteristics and through the careful calculation.In the study a commissioning method of the close-loop control system using the full digital D.C. regulator is given, The PID parameter setting principle inside the speed regulating system by means of man-machine interface and some anti-jamming measures for ensuring system safety in operating process are also given in the paper.The paper also describes how to get the speed regulation wave diagram, to set up measured data and to examine the economic operation indexes.This paper focus on the description of hardware composition and system commissioning... |
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