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6SE70变频器报故障代码F002，意思是：母线欠电压。有以下原因：
１）.一般为熔断器烧毁 。熔断器装置外有，装置内部也有。可用万用表量出是哪的烧了。换报险时千万不要带电换，很危险，而且易烧内部保险。并且要检查好烧保险原因才能更换。主要原因有几种，电机不匹配、电缆线对地、母线接触不良，
２）.变频器显示电压低，看R006显示电压，电压差太多，原因有下几种：
装置内靠近保险出来的检测电路中有 N个电阻，作用是降电压比的，如果有烧毁的，电压显示就会变低，电阻坏的越多显示电压越低，
３）.CUVC板坏掉了，
４）.母线电压P071标定值太高，参数P071= 装置输入电压。
以上几点可以助力快速解决F002的故障，
P071= 装置输入电压F002为预充电故障，判断：
在3s 的zui大预充电时间里达不到80%的zui小直流母线电压（P071 线电压x1.34）的话，则报F002故障。
如果你的P071的值设置的是380V的话，则F002的报故障阈值为：380X1.34X80％＝407.36V
针对F002预充电故障，可能原因有以下几种——
1、可能充电电容有问题。
2、可能检测预充电电压电路有问题。
3、若是存放一年以上的变频器，在使用前，必须预充电，否则就会烧坏电路板或报警。
4、检查进线电源电压有无问题。是否电源电压太低，或者电源缺相。
5、检查参数P071的设置是否正确。
6、如果上述都正常，则检查变频器的整流单元——
1）整流单元必须先于逆变器投入电网；
2）整流单元的参数设置是否正确；
3）整流单元的硬件上是否存在问题，如熔断器烧了等等。
兴旺宝