Transformation, The Electronic Control System Based On Dc Digital Speed Program Planer

Double-housing planer is common large-scale key equipment. It was widely used in mechanical processing industries. At present, most of the old planers which were still used in our country are A series of double-housing planer. The main drive of those planers utilize amplify-generator-motor drive system, the main shortcomings of the system are a serious waste of energy and limited speed range. In addition, because the logic control of old planer is based on the traditional relay control systems therefore a series of questions are existed. Such as circuit complexity, poor stability, and higher failure rate. After it was analyzed carefully that the original double-housing planer control system which aiming to overcome the drawbacks of the original system and to satisfy the user's requirements, a new reformation program of the old double-housing planer's electric control system has been designed this article, this program uses a programmable logic controller as the control core, as well as the DC digital drive as a speed control unit for the DC drive system.The specific reformation programs are as follows. First, instead of the original K-F-D generating units, the paper used the M350R DC digital drive to implement the speed control of the workbench drag motor. Second, instead of the traditional relay-contactor control system, a Mitsubishi FX2N-80MR PLC and contactors are used in performing logic control, thus a large number of unnecessary middle relays,time relay and adjustable resistor are eliminated. Meanwhile, OMRON proximity switches are adopted to replace the original old-fashioned mechanical trip switch, so the security and reliability are improvement when the workbench changes direction.In this paper, the interrelated control theories were introduced, and then it was illuminated, step by step, that the working principle and Electrical schematic diagram of the new system which include the Electric drag circuit, DC speed regulating circuit and Logic control circuit. At the same time, it was explained detailedly in this paper that the various actions realization and system debugging process of the new system.A series of shortcomings of the original system were overcomed by the new control system, while the performance and stability of the new control system has been greatly improved through those reformations. The most important is that the new system has advantages in energy-saving,economic and can be maintained easily.