ABB DCS AC700F CPU模块：AX722F AI731F
ABB DCS AC700F CPU模块：AX722F AI731F
ABB DCS AC700F CPU模块：AX722F AI731F
衡量变频器性能的主要指标有变频增益、失真与干扰、噪声系数、选择性、输入阻抗、愉出阻抗、工作稳定性等，具体性能要求如下:
(1)变频增益要大，失真要小。由于变频器输入为高频信一号频率，输出为中频频率，变频增益是衡量变频效果的重要指标。变频增益高可以减小接收机内部噪声的影响，有利于提高接收机的灵敏度。但是随着变频增益的增大，变频器的非线性失真也将增大，因此，不能片面地强调变频增益而忽视其它指标。
(2)失真与干扰要小，在变频器中会产生幅度失真和非线性失真，还会有各种组合干扰频率分量产生的干扰(如寄生波道干扰、交叉调制干扰、互相调制干扰等).这些组合干扰频率的存在会影响正常通信，严重时，可能出现一大片干扰频率，产生很难听的嘶叫声，迫使通信中断。因此，对变频器而言，不但要求选频回路的幅频特性要好，还应当尽最改进电路(如选择由场效应管或模拟乘法器构成的变频器)，以尽量少产生不需要的频率分量。
(3)噪声系数要小，噪声系数定义为输人信噪比与输出信噪比的比位.变频器的噪声系数对整机信噪比影响比较大，仅次于高频放大级。变频器的噪声系数的大小除与本身因素有关外，还与本振注人信号的大小及工作点的选取有关。噪声系数越小，说明电路性能越好。
F0070故障——
是指变频器与PLC之间的通讯出了问题，变频器在P2040所设定的时间内接收不到合适的报文而产生的故障。一般情况是：
1）通讯线接触不好，受到干扰。
2）通讯板坏或接触不好。
3）主站PLC出了问题。
如果能够排除上位PLC故障的话，建议你好好检查一下ＤＰ网络的走线，以避免PLC与变频器之间的通讯受到干扰——
１）与动力线分开
２）屏蔽层接地
３）终端电阻
同时，你可以看看通讯模块上的显示灯是什么状态？什么颜色？如何闪动？
如果是绿灯闪亮的话，那是PLC没有给变频器报文（检查PLC的控制报文。当某种原因发送了没有内容的报文时，会出现异常）。
如果是常亮的话，就要检查EMC的问题。包括通讯模块的供电方式、包括通讯电缆的抗干扰防护（单独走金属管最好）、通讯系统接地方式等等。
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