... Technical Features1.Input: 3AC 660V/1140V,50Hz2.Control mode: Sensorless vector control, vector control, torque control, V/F control.3.Start-up torque: 0Hz/180 ... 6.Up to 27 kinds of protections: Over-current, Over-voltage, Over-load, Short-circuit, etc.7.Offer optional extension card ... , Electrical submersible pump, etc. ac drives, CHV series medium voltage (690/1140V) high performance explosion-proof