140XBP00200 电源
在同一工厂内大型电机一起动，运转中变频器就停止，这是为什么？
电机起动时将流过和容量相对应的起动电流，电机定子侧的变压器产生电压降，电机容量大时此压降影响也大，连接在同一变压器上的变频器将做出欠压或瞬停的判断，因而有时保护功能（IPE）动作，造成停止运转。
21、什么是变频分辨率？有什么意义？
对于数字控制的变频器，即使频率指令为模拟信号，输出频率也是有级给定。这个级差的小单位就称为变频分辨率。
变频分辨率通常取值为0.015~0.5Hz.例如，分辨率为0.5Hz，那么23Hz的上面可变为23.5、24.0 Hz，因此电机的动作也是有级的跟随。这样对于像连续卷取控制的用途就造成问题。在这种情况下，如果分辨率为0.015Hz左右，对于4级电机1个级差为1r/min 以下，也可充分适应。另外，有的机种给定分辨率与输出分辨率不相同。
22、装设变频器时安装方向是否有限制。
变频器内部和背面的结构考虑了冷却效果的，上下的关系对通风也是重要的，因此，对于单元型在盘内、挂在墙上的都取纵向位，尽可能垂直安装。
23、不采用软起动，将电机直接投入到某固定频率的变频器时是否可以？
在很低的频率下是可以的，但如果给定频率高则同工频电源直接起动的条件相近。将流过大的起动电流（6~7倍额定电流），由于变频器切断过电流，电机不能起动。
24、电机超过60Hz运转时应注意什么问题？ 超过60Hz运转时应注意以下事项
（1）机械和装置在该速下运转要充分可能（机械强度、噪声、振动等）。
（2） 电机进入恒功率输出范围，其输出转矩要能够维持工作（风机、泵等轴输出功率于速度的立方成比例增加，所以转速少许升高时也要注意）。
（3）产生轴承的寿命问题，要充分加以考虑。
（4） 对于中容量以上的电机特别是2电机，在60Hz以上运转时要与厂家仔细商讨。
25、变频器可以传动齿轮电机吗？
根据减速机的结构和润滑方式不同，需要注意若干问题。在齿轮的结构上通常可考虑70~80Hz为大限，采用油润滑时，在低速下连续运转关系到齿轮的损坏等。
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