Unit of velocity describes at FASTECH product catalogue is RPM that means

Revolution Per Minute. Also, we use Hz and PPS(Pulse Per Second) as well.

[r/min] :  It is also expressed in rpm[rev/min] and represents the motor revolutions per minute.

[Hz]     :  It shows the speed of pulse signal sent from the host controller to the motor drive.

[r/min] and [Hz] relation :  If velocity of pulse signal [Hz] goes high, Velocity of motor revolution

[rpm] also gets faster.

[r/min] transform to [Hz] formula is,