... 4.High cost-effectiv Product name: Ac drive, frequency inverter, Inverter, frequency converter, VFD, variable frequency drive, VSD, variable speed drive, AC motor drive, energy saver, speedchanger, variator, speed controllerGoods ... > Pulse/analog input output channels;3> 8 segments speed control;4> Bears automatic voltage regulation (AVR) and automatic current limiting function 5 ...