... ,using automatic tracking to control air compressors situation Power range: 0.75KW-300KW 380V Characteristics: ( ... Constant pressure control Energy-saving is up to 20%-80%,improve the power factor of power grid.Prolong the air-compressor working ... current compact when start. Communication conatct function:Wind turbines,air-compressor,water pumps has computer communication contact function ,using RS- ...