... . 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 ... Machinery: Oilfield Machinery, Electrical submersible pump, etc. ac drives, CHV series medium voltage (690/1140V) high performance explosion-proof