3HAC14549-312A ABB 减少内外电磁干扰

3HAC14549-312A ABB 减少内外电磁干扰

产品型号：简单介绍：3HAC14549-3/12A而新型的PLC，在处理闭环控制方面也不差，并且两者都能组成大型网络，DCS与PLC的适用范围，已有很大的交叉。

为了保证系统在工业电磁环境中免受或减少内外电磁干扰，必须从设计阶段开始便采取三个方面抑制措施：抑制干扰源；切断或衰减电磁干扰的传播途径；提高装置和系统的抗干扰能力。     这三点就是抑制电磁干扰的基本原则。     控制系统的抗干扰是一个系统工程，要求制造单位设计生产出具有较强抗干扰能力的产品，且有赖于使用部门在工程设计、安装施工和运行维护中予以全面考虑，并结合具有情况进行综合设计，才能保证系统的电磁兼容性和运行可靠性。     进行具体工程的抗干扰设计时，应主要以下方面。

在选择设备时，首先要选择有较高抗干扰能力的产品，其包括了电磁兼容性(emc)，尤其是抗外部干扰能力，如采用浮空技术、隔离性能好的控制系统系统；其次还应了解生产厂给出的抗干扰指标，如共模拟制比、差模拟制比，耐压能力、允许在多大电场强度和多高频率的磁场强度环境中工作；另外是靠考查其在类似工作中的应用实绩。     在选择国外进口产品要注意：我国是采用220v高内阻电网制式，而欧美地区是110v低内阻电网。     由于我国电网内阻大，零点电位漂移大，地电位变化大；工业企业现场的电磁干扰至少要比欧美地区高4倍以上，对系统抗干扰性能要求更高，在国外能正常工作的控制系统产品在国内工业就不一定能可靠运行，这就要在采用国外产品时，按我国的标准(gb/t13926)合理选择。

控制比较复杂，控制功能要求比较高的工程项目中（如要实现ＰＩＤ运算、闭环控制、通信联网等），可视控制规模及复杂程度来选用中档或高档机。其中高档机主要用于大规模过程控制、全ＰＬＣ的分布式控制系统以及整个工厂的自动化等。

3HAC14549-312A ABB 减少内外电磁干扰

3HAC14549-312A ABB reduces internal and external electromagnetic interference

Product model: Brief introduction: 3HAC14549-3/12A and the new PLC, in the processing of closed-loop control is not bad, and both can form a large network, DCS and PLC scope of application, has a great crossover.

In order to ensure that the system is protected from or reduced from internal and external electromagnetic interference in the industrial electromagnetic environment, three suppression measures must be taken from the design stage: suppression of interference sources; Cut off or attenuate the transmission path of electromagnetic interference; Improve the anti-interference ability of devices and systems. These three points are the basic principles of suppressing electromagnetic interference. The anti-interference of the control system is a system engineering, requiring the manufacturing unit to design and produce products with strong anti-interference ability, and depends on the use of the department in the engineering design, installation, construction and operation and maintenance to be fully considered, and combined with the comprehensive design of the situation, in order to ensure the electromagnetic compatibility and operational reliability of the system. When the anti-interference design of specific projects is carried out, the main aspects should be as follows.

In the selection of equipment, we must first choose products with high anti-interference ability, including electromagnetic compatibility (emc), especially the ability to resist external interference, such as the use of floating technology, good isolation performance of the control system system; Secondly, we should also understand the anti-interference indicators given by the manufacturer, such as common simulation ratio, differential simulation ratio, voltage resistance, how much electric field strength and how high frequency magnetic field strength environment is allowed to work; In addition, it is based on the examination of its application in similar work. In the selection of foreign imported products should pay attention to: China is the use of 220v high internal resistance power grid system, while Europe and the United States is 110v low internal resistance power grid. Due to the large internal resistance of the power grid in China, the zero potential drift is large, and the ground potential changes greatly. The electromagnetic interference in the field of industrial enterprises is at least 4 times higher than that in Europe and the United States, the system anti-interference performance requirements are higher, and the control system products that can work normally in foreign countries may not be able to operate reliably in domestic industry, which is necessary when using foreign products, according to China's standard (gb/t13926) reasonable choice.

The control is more complex, and the control function requirements are relatively high in the engineering project (such as PID operation, closed-loop control, communication networking, etc.), the medium or high-end machine can be selected according to the control scale and complexity. Among them, high-end machines are mainly used for large-scale process control, full PLC distributed control system and entire factory automation.