one y axis stepper motor not moving

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  • October 7, 2020 at 12:49 pm #11904
    ekimwa
    Member

    one of my y axis motors quit running during a project. replaced motor but still not working. how do i diagnose this? (voltages,etc…..)

    October 7, 2020 at 2:23 pm #11905
    cmcgrath5035
    Moderator

    In this I will call your failed motor Y2 connected to Motor(driver)3.

    The most frequent cause of problems are wiring. Next could be driver devices on tinyG,

    For starters, press reset,
    Do all four Motor leds flash Green for 2 seconds on reboot?
    2 seconds is the default $mt motor timeout. All motors power up on reboot, holding current position, for $mt time interval.
    A green LED(on) for M3 would say voltage was sent from driver device to motor, but driver has no idea if it made it there due to broken wire.

    Whats sort of machine? If you can, manually move the machine along the Y axis (probably will not work with a screw machine.

    A copy of your parameters ($$dump) will help with the next round of suggestions, gather the info, save to a text file and post the file to a cloud drive (Gdrive, etc.) and provide me a URL

    October 7, 2020 at 2:24 pm #11906
    cmcgrath5035
    Moderator

    And, what sort of tools do you have?
    Multimeter?
    Oscilloscope?

    December 8, 2020 at 1:48 pm #11921
    ekimwa
    Member

    sorry, got busy with other things. when i press reset, no motor lights flash. However when i send y axis home, only 3 motor lights flash green. To answer your question, using multimeter.

    December 8, 2020 at 2:12 pm #11922
    cmcgrath5035
    Moderator

    The difficulty of troubleshooting here with just a multimeter is that all voltages sent to steppers are rather narrow PWM pulses. difficult to interpret with a multimeter.

    Can you send be a parameter dump?
    $$ command in a console, copy and past the results to a text file, upload the text file to a cloud drive and post a URL here.Which motor is the one not moving, M1, M2, M3 or M4?

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