... can adjust frequency of power supply of pumps or fans, control its speed, improve productivity Adjustable Speed Drive:HARSVERT-A series of Medium Voltage Variable ... of3,3.3,4.16,6,606 and 10 kV,direct output of 3,4.16, 6,6.6 and10 kV,no output transformer ... to standard induction motor,no harm to the insulation of the cable or the motor, low harmonics of the motor, reduction of vibration of the shafts ...