日立J300系列变频器(日本产)是变频器中较有特色的一种。今就该变频器中,几种比较独特的功能内容及使用时应注意的问题介绍于后。 一、自动节能功能 在“异步电动机的电流—电压曲线”一文(本刊1997年第9期)中,已经阐述了: 当电动机在某一频率f_x下工作时,存在着—个“最小电流工作点”。该最小电流工作点,可以通过改 Hitachi J300 Series Inverter (Japan) is a more characteristic in the inverter. Now this inverter, several more unique features and use should pay attention to the problems introduced later. First, the automatic energy-saving features In the “current-voltage curve of asynchronous motors,” a article (1997 issue 9), has been described: When the motor at a frequency f_x work, there is a - “minimum current work point”. The minimum current operating point, can be changed