... highly reliable with high-performance to control the Pump Controller:HARSVERT-A series of Medium Voltage Variable Frequency Drive ... Voltage resource VFD, direct input of3,3.3,4.16,6,606 and 10 kV,direct output of 3, ... 4.16, 6,6.6 and10 kV,no output transformer ... circuits are linked with the controller by the optical fibers, which keep the controller safe and away from the ...