推荐回答（4个）
没问题的！电流检测的误差范围造成的！机械负载的计算亦不同于平方负载算法！
PS 楼中的中心思想是通过调整变频器的过载保护系数。从而达到保护电机的目的。楼主的良苦用心大家都很理解。“无论我把频率调到20HZ还是40几HZ，变频器上显示的电流没有任何的变化 不知道是为什么？”这就要从正泰变频器的电流检测电路说起了。此款变频器的电流检测电路时通过T运放检测电流。通过的逻辑地与参考地检测电流。由于电流检测分辨率的精度不够造成CPU检测阀值得动作值过高。以至于出现的是CPU直接报过载保护而非楼中所想要的过流保护。。楼中可以脱开负载给定频率，在监测一下电流值。 PS PS 国产变频器的性价比！真心希望楼主能应给予理性及正确的的认知！所以不要和ABB 西门子的变频器去做比较。无论从由于设计理念，制造工艺 销售价格上。真心的没有可比性！
1，正泰，这个品牌的产品，请对它的测量精度和整定的动作精度保持一定的怀疑精神。如果测量不准，则动作值能准吗？
2，假使认为它各方面都是准的，那么也不应该按照0.9A来计算和设定，而是应该按照1.52A来。
3，运行电流0.9A不变，那是你肉眼的观察，而变频器能检测到的电流尖峰是你肉眼不可见的，你没看到大于0.9A的时刻，不代表这个时刻不存在，它出现了，就跳了，就这么简单。皮带有点卡，轴承没油了，石灰重了点，这都是负载变化，都会引致电流变化。
变频器的保护参数比较多，一般不会把电机烧坏，如果没有特殊的要求设置基本的参数，默认就可以。你的设备应该是重载的设备，设置的是1.6倍也可以，在正常的情况下，可以下调到1.2--1.4.
关于过载系数百分比，是这样的，如果设定成100%就是对应变频器本身的额定电流。
你的变频器电流3.75A，如果过载系数设定为100%，当变频器检测输出电流为3.75A时，变频器才会跳故障保护。
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