Nidec Variable Frequency AC Drive / Servo Drive - Input Phase 3, Supply Voltage 500/575 V ac, 50 hp Normal Duty, Output Current 53 A Normal Duty, IP 20 Rating, 50/60 Hz, Frequency Control, Open Loop Vector Control, Rotor Flux Control, Closed Loop Induction Motor Control, Permanent Magnet Motor Control, Regenerative Control, Servo Control