[kawazuki]

As no one else has mentioned it - that is a SERVO driver and you have said you are using STEPPERS with encoders elsewhere ? ? ? Servos maybe AC powered - steppers are most certainly DC powered and polarity connections will be important yo ensure rotation direction is as commanded and not reversed!

[CitizenOfDreams]

As no one else has mentioned it - that is a SERVO driver and you have said you are using STEPPERS with encoders elsewhere ? ? ? Servos maybe AC powered - steppers are most certainly DC powered and polarity connections will be important yo ensure rotation direction is as commanded and not reversed!

We are talking about the power supply connection, not the motor connection. AC/DC power has nothing to do with the motor type, it depends on whether the driver has a built-in rectifier. This particular one does, so it can be powered with either AC or DC.