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Lab12b with throttle added

roy bordey
Intellectual 255 points

The control works OK but it shuts down the drv-8301 when changing speed quickly.

  • 0
    Intellectual 655 points
    You don't give a lot of information here...

    If during acceleration, check your power supply current limit, could be an undervoltage due to current limit.
    If during deceleration, check your power supply, because most power supplies do not like it if you spank them with regenerative energy.

    If on a battery, we need more information.
  • 0 in reply to Rob Jacobs67
    Intellectual 255 points
    Hi Rob,
    I am using two linear 24 v. 12a. Dc Power Supply that can be configured to either 24v., 24a.
    or 48v. 12a. supply. I tested my kit on both configuration and it behave the same way.
    I experienced this problem mostly when decelerating rapidly and sometimes when accelerating.

    Your help is very much appreciated.

    Best regards ,

    roy
  • 0 in reply to roy bordey
    Intellectual 655 points

    When decelerating rapidly you take energy from the motor, and try to put it onto the DC bus. Since you have a power supply as the DC bus, you are trying to push the energy into the power supply. Some power supplies can handle this (the expensive, sourcing and sinking supplies), others can't, and some get destroyed.

    There are two solutions;

    Don't decelerate so quickly. Set a lower gMotorVars.MaxAccel_krpmps (from memory, forgive me if I got the name wrong) to limit acceleration and deceleration.

    Get a power source which can handle the energy getting pushed back in. A big battery can handle the drain when accelerating as well as the charging when decelerating. Keep in mind that a big battery can also deliver enough power to destroy your electronics in an exciting way, so I would advise just lowering MaxAccell

    Best regards,

    Rob

  • 0 in reply to Rob Jacobs67
    Intellectual 255 points
    Hi Rob,
    I am greateful for those very important and valuable information you provided.
    It gave me a better perspective of the problem I am trying to fix.

    Weighting the pros and cons of different solutions , I would like to explore the
    use of Regenerative Baking or use of a Braking Resistor.
    It seems such system would present less danger to the health of my project.

    Could you suggest any site I can visit that would get me started on the subject
    matter.

    Thanks again and Best Regards ,

    roybordey@hotmail.com