Mitsubishi PLC and frequency converter in a metal strip and the application of roll system

1, system overview of metal strip during rolling, annealing, cleaning, pull the various processing technology such as masking, requires a set of stable operation of strip rolling system to receive constant tension control, ensure the rolling into the side of strip coiling procedure again after processing, in order to carry out the procedure. Long metal strip down volume constant tension system was dominated by dc speed regulating tension control system, dc speed control system, high price and maintenance cost is expensive, the frequency control technology rapid development today, completely can be used to replace the inverter with ordinary frequency conversion motor, and also can achieve constant tension control system of release. Therefore, when a metal material company a strip cleaning printing line requirement when we transform, we chose the rolling system, frequency conversion velocity modulation constant tension change instead of the original dc speed control scheme of the production line. 2, the process characteristics of the strip cleaning printing line first impurity on the surface of a strip rust dirt cleaning, drain the water on the surface after printing, and then into the oven to dry, again after cleaning oil winding. For strip during the above procedure guarantee strip tension constant, and the linear speed of 0 - 10 m/MIN is adjustable; Cleaning water tank water temperature and heating temperature is adjustable and can be a constant temperature of the drying box; After clear strip surface printing, printing printing effect is good after cleaning again after the drying heat; Winding tension stable and neat, the following equipment is: figure 1 strip cleaning line diagram 3, the control system according to the above requirements, and it is the original equipment modification, the customer provides the mitsubishi FX2N PLC, and then we choose mitsubishi electric performance excellent A840 inverter three series, all used in uncoiling machine, winding machine, and a benchmark roller speed, installation for each motor encoder. PC speed is given to the linear speed datum roller inverter, then an open-book motor inverter and winding inverter control current loop tension given way. According to the principle of linear velocity is equal, the same time speed datum roller with an open-book motor through the village, equal to launch speed datum roller radius and the number of encoder product and radius of decoiler strip Bian decoder number equal to the product, which can calculate the real-time roll diameter of decoiler, according to the tension and torque calculation formula, can calculate the torque needed at this time, instead of current for a given percentage to uncoiling inverter, winding machine, thus ensuring a constant tension control. And winding machine using servo motor and rectify the probe to rectify, to ensure the winding is neat. The cleaning brush roller adopt contactor start-stop power frequency between two cleaning tank and before and after drying box adopts three sections of three-phase thyristor controlled resistance wire, using index K thermocouple feedback to three temperature controller which can adjust the PID temperature control, and then use the computer to communicate with a temperature controller setting and feedback. PC using kingview software, the whole system with PLC of FX2N - 64吨( Customer inventory) FX2N - 4 da and FX2N - 4 each one AD, 0 for servo motor. 75 kw a ( Customers) 。 4, system debugging the whole system operation is divided into two most transmission and online, when transmission button press the online button press, system uncoiler, winding machine could both positive and negative turn to facilitate operators wear belt and roll back tight or loose volumes, each may be manual start-stop cleaning roller. When driving and online button press, system linkage, production line according to the parameters set by the operator on the upper machine of linear velocity and tension of the online operation, decoiler and winding machine started to coil diameter calculation and real-time output torque in order to satisfy the demands of tension, the cleaning brush roller and heating drying also online work. And winding rectifying servo motor strip according to rectify the probe correction, to ensure system safety, must be carried out on the open book motor and winding speed limits, in order to prevent the coasters. The following for the commissioning of pictures ( Due to the customer site inconvenience take pictures then took the following a few pieces only) By the pictures you can see, strip winding tension constant and neat. The GX - by PLC WORKS2 programming software on the computer, for programming diagram below, the specific process: PLC program design part of the ladder diagram 5, system advantages this system to replace the original down volume dc speed regulating system, with the excellent properties of mitsubishi A840 excellent control performance and FX series PLC, the motor, for clients to save cost and subsequent maintenance funds. 6, summary of mitsubishi PLC controller and inverter in the metal strip and roll system control performance is very good, can be seen from the above system got a good run, that can totally replace industry of dc speed control scheme has been adopted, has the very good price advantage and maintain advantages.
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