CE, ISO9000 certification 3 phases, 380V AC 5.5~7.5KW inverter VVVF control, constant, ... vairable torque mode VD4 series3 phases, 380V AC 5.5~7.5KW invertersVD4-45P5Suitable motor: 5.5KW, ... .1%Start frequency0.40Hz~20.00HzTorque boostAuto torque boost,manual torque boost 0.1%~30.0%V/FFFFF curveFive ... digital panel; brake resistor. frequency inverter VD4 series ac frequency inverter