... 2.Advantage:with USB communication interfaces,sustaining Modbus precise digital control AC Servo driver Product Introduction Servo driver ... ,Overvoltage,Overcurrent,Overload,Abnormal brake,Abnormal Encoder,out of tolerance etc.FeatureSpeed Frequency Response ≥300HzSpeed Fluctuation Rate <±0. ... <±0.02%(power-15% +10%)Speed Ratio3.513889Other pictures precise digital control AC Servo driver