The frequency function can be opened according to the user requirements. The supply range of Phil Sheng inverter screw compressor is 5.5KW to 400KW, and the flow rate is from0.75m/min 67m/min fand to fand, exhaust pressure from 0 35MPa to 1.3mpa, a water-cooled, air-cooled, belt drive and straight to stop frequently in a variety of configurations. PLC fully supports frequency conversion, and PLC can display and set the desired frequency parameters.