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  1. #1
    I'm rebuilding a 60/40 CNC.
    I'm using DM542T drivers and Nema 23HS45-4204S stepper motors
    The amps/phase rating for the motors is 4.2 amps
    The dip switches can be set at either 3.76 or 4.5 amps
    Which should I use ?
    Thanks Evans

  2. #2
    Though steppers can be run pretty hot I don't think you should exceed the phase current rating, so 3.76 max. If they give enough torque you could reduce the current so they run cooler, but steppers commonly run pretty hot.

  3. #3
    Quote Originally Posted by Evans View Post
    I'm rebuilding a 60/40 CNC.
    I'm using DM542T drivers and Nema 23HS45-4204S stepper motors
    The amps/phase rating for the motors is 4.2 amps
    The dip switches can be set at either 3.76 or 4.5 amps
    Which should I use ?
    Thanks Evans
    The 4.5A is the peak value, so you can safely set it to the maximum. Also, the motor is rated at 4.2A, but that is not and absolute maximum +/- 10% is normal margin, so you can safely use it with the driver set to 4.5A. On the other hand, why set it to maximum unless you need the extra power? So set it to 3.8A full current, and if it is good and not losing steps then keep that setting.

    Note that steppers operate at very high temperature, so don't panic if you burn your hand when touching it. 60C -- 80C is OK, and that's far more than what your hands tolerate. It can feel hot already around 40C, which is pretty cool for a stepper.

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