StepperOnline drives and integrated motors support two distinct control signals: MF (Motor Free) and ENA (Enable). While functionally similar, they serve different design purposes. Many users confuse the two, so this article clarifies their subtle yet critical differences in design intent and typical application scenarios.
ENA (Enable Signal): Its core function is to activate or disable the drive's power output stage. It functions as an electronic switch for the power stage.
MF (Motor Free Signal): Its core function is to command the drive to cut off current to the motor windings, allowing the motor shaft to rotate freely. It serves as a functional command to release the motor shaft. On certain models, this signal is labeled as FREE.
In most applications, activating either the ENA or MF signal produces the same result: the motor is de-energized and the shaft rotates freely. For most stepper and closed-loop drives, both signals result in the motor being disabled (de-energized), though their intended use cases differ. Upon receiving either signal, the motor is de-energized, and the motor shaft enters a free state.
Note: The active logic level (HIGH or LOW) for these signals varies by model. Always refer to the product datasheet for the correct wiring and logic configuration.