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Triconex 9662-810

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Triconex 9662-810

类目:RELIANCE
型号:Triconex 9662-810
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There are many methods to set PID control parameters, which are summarized in two categories: one is theoretical calculation and setting. It is mainly based on the mathematical model of the action system of the injection molding machine, and the control parameters are determined by theoretical calculation. The calculation data obtained by this method may not be directly used, but also must be adjusted and modified by the actual action of injection molding machine. The second is the setting method of the action process of the injection molding machine. It mainly relies on the experience of the injection molding machine action control, and directly adjusts the pressure, speed and temperature when the injection molding machine is running. The method is simple and easy to master, and is widely used in the commissioning of the injection molding machine. The engineering setting methods of PID control parameters are mainly critical proportion method, reaction curve method and attenuation method. The three methods have their own characteristics, and their common point is to pass the test, and then adjust the PID parameters according to the experience of injection molding machine debugging. However, no matter which method is adopted, the PID parameters need to be adjusted and perfected in practice. During the field setting of injection molding, we should keep PID parameters in the order of proportion first, then integration and final differentiation. While observing the trend curve of field process value PV, slowly change PID parameters and make repeated trial until the control quality meets the requirements. In the setting of injection molding machine pressure, speed and temperature, we usually turn off integral term and differential term first, i.e. ti is set to infinity and TD is set to zero, so that it can be adjusted as pure proportion. The initial scale is set according to the empirical data, and the proportion is controlled slowly according to the PV curve, so that the system can achieve the PV curve with 4:1 attenuation oscillation, and then add the integral function. Before the integral action, the proportion should be increased to about 1.2 times of the original. The integration time ti is adjusted from large to small until the system obtains the PV curve of 4:1 attenuation oscillation again.