Duet 2 Ethernet Setup Warning.



  • I just bought a Duet2 Ethernet and am using it on a Alunar (Anet A8) printer. I have updated to 3.0. When I home X or Y I get the motor phase warning below.

    2/1/2020, 11:23:09 AM G28 Y
    Warning: motor phase A may be disconnected reported by driver(s) 2
    Warning: motor phase B may be disconnected reported by driver(s) 2

    2/1/2020, 11:26:18 AM G28 X
    Warning: motor phase A may be disconnected reported by driver(s) 2
    Warning: motor phase B may be disconnected reported by driver(s) 2

    Both X and Y will home though. I have not tried Z or E yet. I can move X and Y +/-50 with no warnings but every time they home I get a phase warning.

    Where should I look to see why I am getting these warning?


  • Moderator

    Is your Z connected correctly? The X and Y homing files probably have a Z move to lift the head out of the way for travel. If the Z axis isn't connected correctly you could get those warnings.


  • administrators

    What motors are you using, what motor current have you set, and what VIN voltage do you use? You can get those warnings when you use high voltage, high inductance motors (which are a poor choice for 3D printers) and you have the current set too high.



  • Not sure what the stepper motors are goolged the numbers on it buy did not find any thing. I did measure the resistant to figure out the phasing though. Both winding were 4.5 ohms.

    I will connect the Z axis and see if I get the same warning.


  • administrators

    @Keith53 said in Duet 2 Ethernet Setup Warning.:

    Both winding were 4.5 ohms.

    That's quite high, so you probably need 24V power to get good results from those motors. Are you using 24V?

    Reducing the homing speed will probably get rid of the warnings.

    What are the numbers on the motors?

    If you can't find any data for those motors, then you can estimate the motor parameters by searching for motors of similar size (Nema 17?) and length with similar phase resistance.



  • @Phaedrux said in Duet 2 Ethernet Setup Warning.:

    Is your Z connected correctly? The X and Y homing files probably have a Z move to lift the head out of the way for travel. If the Z axis isn't connected correctly you could get those warnings.

    You were right Z moves up and then back down when X and Y are home individually. The warning does not happen now Thanks!

    @dc42 said in Duet 2 Ethernet Setup Warning.:

    @Keith53 said in Duet 2 Ethernet Setup Warning.:

    Both winding were 4.5 ohms.

    That's quite high, so you probably need 24V power to get good results from those motors. Are you using 24V?

    Reducing the homing speed will probably get rid of the warnings.

    What are the numbers on the motors?

    If you can't find any data for those motors, then you can estimate the motor parameters by searching for motors of similar size (Nema 17?) and length with similar phase resistance.

    I was wondering about getting a 24V PS. the numbers on XY and Z motors are
    A4001-83HTS24LS
    20161222238

    Motor are 42mm square and 37mm long


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