What is the Functional Difference Between the MF Signal and the ENA Signal?

Our drives and integrated motors feature the following two distinct signals. The MF signal (sometimes called FREE) and the ENA (ENAble) signal on stepper drives are functionally so similar that many users confuse them. However, there are subtle yet critical differences in their design purpose and typical application scenarios.

ENA (Enable Signal): Its core function is to activate/disable the drive's power output stage. It acts as an "electronic switch."

MF (Motor Free signal): Its core function is to command the drive to cut off the motor current, allowing the motor shaft to rotate freely. It is a "functional command."

In the vast majority of cases, whether you set the ENA signal high or the MF signal high, the end result is the same: the motor loses power, and the shaft can rotate freely. For most stepper and closed-loop drives, both act as "disable" signals. Upon receiving either signal, the motor is de-energized, and the motor shaft enters a free state.

Updated on: 26/09/2025