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              1. 智能信号隔离器的隔离端子如何设置

                日期:2019-07-02 08:35
                澳门国际app科技智能信号隔离器首先将变送器或仪表的信号,通过半导体器件调制变换,然后通过光感或磁感器件进行隔离转换,然后再进行解调变换回隔离前原信号,同时对隔离后信号的供电电源进行隔离处理。保证变换后的信号、电源、地之间独立。
                  一、智能信号隔离器安装维护应注意哪些事项?
                  由于生产厂家不同,对智能信号隔离器的生产工艺、接线定义也不都相同,但使用场合基本相同,所以对产品的安装防护要求及维护基本相同。
                  1.使用前应详细阅读说明书;
                  2.作为信号隔离使用时,应将输入端串入环路电路中,输出端接取样回路;
                  3.作为隔离配电使用时,应将输入端串入电源电路中,输出端接变送器;
                  4.若不正常工作应先检查接线是否正确,注意电源有无及极性反正。
                  二、智能信号隔离器设计隔离端子的原则是什么?
                  需要为每台隔离器都配电源吗?设计要遵循两个原则。
                  外部设备与中央处理系统(例如PLC、DCS)之间要进行电气隔离。
                  第二:外部设备信号(无论是向中央处理系统发送信号的外部设备到还是接收信号的外部设备)之间要实现相互电气隔离。
                  例如要把PLC输出的一路信号传给两个外部设备就要求输入/输出保证隔离的同时二个输出之间也是隔离的。如果隔离端子的外加工作电源与输入/输出两个部分都隔离,那么不管隔离器数量的多少,都可只用一台电源供电。

                Intelligent signal isolator first converts the signal of transmitter or instrument through semiconductor device modulation, then isolates and converts it through photosensitive or magnetic sensor, then demodulates and converts it back to the original signal before isolation, at the same time isolates the power supply of the isolated signal. Guarantee the independence of the transformed signal, power supply and ground.
                 
                1. What should be paid attention to in installation and maintenance of intelligent signal isolator?
                 
                Because the manufacturers are different, the process and wiring definitions of intelligent signal isolator are different, but the use occasions are basically the same, so the installation and protection requirements and maintenance of products are basically the same.
                 
                1. Read the instructions carefully before use.
                 
                2. When used as signal isolation, the input end should be connected into the loop circuit, and the output end should be connected with the sampling circuit.
                 
                3. When used as isolated distribution, the input terminal should be connected into the power supply circuit and the output terminal should be connected with the transmitter.
                 
                4. If it does not work properly, check whether the connection is correct and pay attention to the power supply and polarity anyway.
                 
                2. What are the principles of designing isolation terminals for intelligent signal isolators?
                 
                Do you need to distribute power for each isolator? The design should follow two principles.
                 
                The electrical isolation between the external equipment and the central processing system (such as PLC, DCS) should be carried out.
                 
                Secondly, electrical isolation should be achieved between external device signals (whether they are external devices that send signals to the central processing system or external devices that receive signals).
                 
                For example, to transmit the one-way signal from PLC to two external devices requires that the input/output guarantees isolation while the two outputs are also isolated. If the external working power supply of the isolation terminal is separated from the input/output part, then no matter the number of isolators, only one power supply can be used.

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