... Mode (1) VF control: Multiple curve could been chosen, Linear V/F curve, 2.0 times power drop torque V ... inverter drives multiple motors, such as fan, water pump, engraving machine, injection molding machine etc. (2) Open-loop vector control: Steady speed with ... vector is suitable for high-Performance universal occasions such as machine tools, centrifuges, cranes and handling equipment, rolling mill and ...