Keba PS244/E冗余容错控制系统模块现货

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型号：PS244/E
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Keba PS244/E冗余容错控制系统模块现货

S7-200和文本显示器TD200在筛板冲孔加工中的应用。此系统降低了劳动强度，操作简单方便。通过TD200组态以及PLC控制程序对冲床进料系统进行控制，构成一个高效的经济型数控机电一体化装置。
关键字
：PLC，TD200，文本显示器，冲压机，进料系统
1. 筛板冲孔装置及其控制系统
矿用振动筛筛板(冲孔板)在冲孔加工时，大都是操作工先在钢板上标出孔的位置，然后再由人工进料用冲床冲出。这种加工方式劳动强度大、工作效率低、加工精度难以保证。为此我们研制了自动冲孔系统。筛板冲孔装置由冲床、横向工作台、纵向工作台、接近开关，交流接触器，中间继电器，S7-200，TD200等。产品制造流程是：手工上料，按自动运行按钮，横向步进
电机
和纵向步进电机分别启动完成工件的横、纵向进给，从而冲床完成工件的加工，后横向工作台和纵向工作台回到原始位置。除了具有自动完成横、纵向进给，此装置还具有点动进给功能。此装置以德国西门子（SIEMENS）公司S7-200系列PLC对冲压机进料系统中的两个步进电机进行控制，实现横向和纵向的自动进给。并使用TD200对工艺参数进行设定和显示。为降低成本，本系统使用了一个步进电机驱动器来驱动两个步进电机。TD200是专门为S7-200系列PLC配备的操作员界面，它是一种连接简单，操作方便，功能强大的实用性
人机界面
解决方案，它通过一根TD/CPU电缆和PLC实现互连，它具有如下功能：
（1）显示从S7-200CPU中读取的信息；
（2）可以调整选定的程序变量；
（3）提供为具有实时时钟的CPU设置时间和日期的能力；
（4）提供强制、非强制I/O点的能力；
（5）提供八个可供用户定义的设定和显示功能。
TD200在系统中的使用使PLC功能更丰富，PLC与用户的接口界面更友好，PLC的可操作性大大提高。
2. 系统控制工作原理
本系统控制原理如图1所示。各部分的功能分别介绍如下：

图1.系统控制原理图
Fig.1 system control principle
1）步进电机驱动器控制原理
驱动器的控制功能主要通过四个输入点完成。
（1）公共端接地。
（2）脉冲信号输出：每来一个脉冲，驱动步进电机运行一个步距角。
（3）方向信号输入：控制步进电机的两个转向，高电平正转，低电平反转。,it will produce induced electromotive force, and the voltage generated by induced electromotive force will flow back to the output end of switching power supply;

3. In the equipment of water electrolysis of hydrogen and oxygen, there is also a phenomenon of reverse voltage at the output end of the switching power supply.

Taking the reverse voltage of these three cases as an example, the hazards and solutions of switching power supply in this case are given below.

Example 1: the application of switching power supply in DC charging pile, and the solution of anti backflow voltage at the output end:

The market has high requirements for battery charging of new energy vehicles and BMS power distribution system. In order to charge different types of cars, the auxiliary power supply in the DC charging pile is required to have two voltage values of 12V and 24V. The auxiliary voltage source of bus charging system adopts 24V power supply, while the auxiliary voltage source of car charging system adopts 12V voltage value. In the design of power supply, the voltage withstand value of filter electrolytic capacitor at the output end of switching power supply with output voltage of 12V is generally selected as the specification value of 16V. Once 24V voltage is poured back to the output end of power supply, it is equivalent to adding 24V voltage to both ends of 16V electrolytic capacitor, and the electrolytic capacitor will be damaged due to overvoltage, resulting in the failure of 12V switching power supply. For DC charging pile equipment, our company has two solutions: split scheme and centralized scheme: for split application scheme (two switching power supplies, one outputs 12V and the other outputs 24V), the specification value of output filter electrolytic capacitor in switching power supply products with output voltage of 12V is 35V. Even if the 24V voltage value is inverted at the output end, the electrolytic capacitor is also within the withstand voltage specification value, and there is no electrolytic capacitor overvoltage damage. For centralized application scheme (integrating 12V and 24V output voltages into a power product, and selecting the output voltage through the switch gear): the electrolytic capacitor at the output end is a common electrolytic capacitor, so the withstand voltage value of the filter electrolytic capacitor at the output end is selected as the 63v specification value, Even if there is 60VDC reverse voltage at the output end, the output filter electrolytic capacitor will not be damaged, so as to ensure the reliable operation of the filter electrolytic capacitor, so as to ensure that the switching power supply will not be damaged when there is reverse voltage at the output end. When the switching power supply works normally, the output current flows into the load through the diode.