节能运行模式：轻载时降低电压减少了激磁电流，电机电流分为有功分量和无功分量（激磁分量）提高COS。
Energy-saving operation mode: light load voltage reduces the excitation current, the motor current is divided into active component and reactive component (excitation component) for improving COS.
节能运行模式：当电动机负载轻时，软启动器在选择节能功能的状态下，PF开关热拨至Y位，在电流反馈的作用下，软启动器自动降低电动机电压。减少了电动机电流的励磁分量。从而提高了电动机的功率因数（COS）。（国产软启动器多无此功能）在接触器旁路状态下无法实现此功能。TPF开关提供了节能功能的两种反应时间；正常、慢速。节能运行模式：自动节能运行。（正常、慢速两种反应速度）空载节能40%，负载节能5%。
Energy saving operation mode: when the motor load is light, the soft starter in the choice of energy saving function, PF switch heat dial to Y bit, under the action of current feedback, soft starter automatically reduce the motor voltage. The excitation component of the motor current is reduced. In order to improve the motor power factor (phi COS). (domestic soft starter without this feature) this function can not be achieved in the contactor bypass state. The TPF switch provides two kinds of reaction time and energy saving function; normal, slow. Energy saving operation mode: automatic energy saving operation. (two normal, slow reaction speed) no-load energy-saving 40%, saving energy 5%.
