... 2KW inverter VVVF control, constant,vairable torque mode VD4 series single phase, 220V AC 1.5~2.2KW inverter VD4-21P5Suitable ... .00HzTorque boostAuto torque boost,manual torque boost 0.1%~30.0%V/FFFFF curveFive modes:constant torque V/F ... master-slave multi-devices linkage function Running functionCommand modeOperated by three mode: digital panel, control terminal, serial portFrequency setting ...