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Community Favorite Taking the R1+ ramps and rewiring to make generic Ramps Work

Discussion in 'Mods and Upgrades' started by Geof, Apr 22, 2016.

  1. Mauricio Bremer

    Mauricio Bremer New Member

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    Thanks for the pointers, I'll try to switch back to the original board and try with another generic ramps.

    I'll check the steppers calibration too in case something moved
     
  2. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    Good luck, if you have a spare stepper driver you can try swapping that in on the Z as well.
    Other than that it sounds like you are set to figure it out :)
     
  3. Mauricio Bremer

    Mauricio Bremer New Member

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    So I did some testing and calibrated the stepper drivers.. now the Z axis is moving, but the motors don't seem to move at the same time.. either it moves too much when I try to move 1 mm or it moves one motor and then the other.

    My multimeter has 2 options for Voltage (700 and 1,000) so I don't think it'll work for this.

    So individually all the axis seem to move (z moves seems to move like 1 mm when I try to move 0.1 mm and like 10 mm when i try 1 mm). But when I try to auto home it jams and makes a mess trying to move the axis.

    I'm noticing when I try to auto home.. the x axis motor starts moving and stops really hard with the beeping sound (it moves fine on its own tho) and no other motor actually moves after that.

    I even tried using the drivers from my other R1+ (working fine) but I get the beeping sound the way they're calibrated.

    I've tried manually tweaking the drivers (increments of 10º) with no luck.

    Finally, I switched back to the original board, plugged the drivers as they were in the other board and it worked fine.. does this mean my new RAMPS is defective?
     
    #123 Mauricio Bremer, May 5, 2021
    Last edited: May 5, 2021
  4. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    It is certainly possible.
    If swapping the drivers from the working board did not help that is a good indication the RAMPS itself is the problem.
    It is not absolutely certain (sadly) because the way the stepper motors are driven is a current loop provided by the stepper drivers which convert the digital signal from the Arduino/RAMPS into the current the stepper needs to drive. This is why it helps to tune them on the board you are going to use, but if you were unable to get them to work on the new board even by adjusting the current, it is the RAMPS board.

    The RAMPS is cheap enough I would just swap it rather than invest a lot of time troubleshooting it, but if you wanted to prove it is the problem you would want to go through the stepper driver calibration on the board you suspect is defective and when it fails that proves it is the RAMPS (because you can calibrate them on the original one). Personally -- I think you have proven it :)
     
  5. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    And yes, it is not only possible, but often likely that buying a new RAMPS board gets you a dead/defective one. They are so inexpensive that there is no testing or quality assurance that gets done as part of their manufacturing. Last time I had to replace one and I was shopping only for the RAMPS, I had to buy three (each from different vendors) to get one that worked.
     
  6. Mauricio Bremer

    Mauricio Bremer New Member

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    Just a note for future people reading this.. always check the jumpers under the drivers!! :oops:

    On the bright side, I now have a spare RAMPS for when one of those annoying MOSFETS burns down again.
     
    mark tomlinson likes this.

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