3HAC5689-1

3HAC5689-1

3HAC5689-1

3HAC5689-1

 电源干扰的抑制。

  一般通过设置屏蔽电缆和PLC局部屏蔽及高压泄放元件进行保护。选用隔离性能较好的设备、选用优良的电源、动力线和信号线走线要更加合理等等，对电源变压器、中央处理器、编程器等主要部件，采用导电、导磁性良好的材料进行屏蔽处理，以防止外界干扰信号的影响。电源调整与保护:电源波动造成电压畸变或毛刺，将对PLC及I/O模块产生不良影响。对微处理器核心部件所需要的+5V电源采用多级滤波处理，并用集成电压调整器进行调整，以适应交流电网的波动和过电压、欠电压的影响。尽量时电源线平行走线，时电源线对地呈低阻抗，以减少电源噪声干扰。其屏蔽层接地方式不同，对干扰抑制效果不一样，一般次级线圈不能接地。输入、输出线应用双绞线且屏蔽层应可靠接地，以抑制共摸干扰。此外可以安装一台带屏蔽层的变比为1：1的隔离变压器，以减少设备与地之间的干扰，还可以在电源输入端串接LC滤波电路等。

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