... .Input: 3AC 660V/1140V,50Hz2.Control mode: Sensorless vector control, vector control, torque control, V/F control.3.Start-up torque: 0Hz/ ... Short-circuit, etc.7.Offer optional extension card.8.Explosion-proof design is alternative.9.ac drivesApplication1.Mine working machines ... Machinery, Electrical submersible pump, etc. ac drives, CHV series medium voltage (690/1140V) high performance explosion-proof