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MHD071B-061-NP1-UN

型号: MHD071B-061-NP1-UN  分类: REXROTH力士乐/模块驱 动器
  • MHD071B-061-NP1-UN


1.注意电源安装
  电源是干扰进入PLC的主要途径。PLC系统的电源有两类:外部电源和内部电源。
  外部电源是用来驱动PLC输出设备(负载)和提供输入信号的,又称用户电源,同一台PLC的外部电源可能有多规格。外部电源的容量与性能由输出设备和PLC的输入电路决定。由于PLC的I/O电路都具有滤波、隔离功能,所以外部电源对PLC性能影响不大。因此,对外部电源的要求不高。
  内部电源是PLC的工作电源,即PLC内部电路的工作电源。它的性能好坏直接影响到PLC的可靠性。因此,为了保证PLC的正常工作,对内部电源有较高的要求。(http://www.diangon.com版权所有)一般PLC的内部电源都采用开关式稳压电源或原边带低通滤波器的稳压电源。
  在干扰较强或可靠性要求较高的场合,应该用带屏蔽层的隔离变压器,对PLC系统供电。还可以在隔离变压器二次侧串接LC滤波电路。同时,在安装时还应注意以下问题:
  1)隔离变压器与PLC和I/O电源之间最好采用双绞线连接,以控制串模干扰;
  2)系统的动力线应足够粗,以降低大容量设备起动时引起的线路压降;
  3)PLC输入电路用外接直流电源时,最好采用稳压电源,以保证正确的输入信号。否则可能使PLC接收到错误的信号。

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