CE, ISO9000 certification 3 phases, 380V AC 5.5~7.5KW inverter VVVF control, constant,vairable torque mode VD4 series3 phases, 380V AC 5 ... %~30.0%V/FFFFF curveFive modes:constant torque V/F curve, 1 V/F curve mode by user and 3 kinds of ... changes, maintain the constant of output voltageAuto energy saving modeV/F curve is optimized automatically according to the load condition to ...