Stepping motor drive: 1) Input power: single/three phase AC220V -15 ~ +10% 50/60Hz 2) Regenerative braking: internal ... rate<+/- 0.03 (load0~100%); <+/-0.02(power -15~+10%)( numerical value depend on rated speed)speed regulation ... and so onprotection functionover speed, overpressure & undervoltage of main power, overcurrent, overload, operation unusual, encoder unusualpositional deviation and so ...