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General Mach Discussion / Re: Any help / suggestions please?
« on: October 08, 2016, 04:19:52 AM »
To answer your question as I understand it, it would depend on the rating of the power supply and the current requirements for the motor/driver systems. I'm not too familiar with servo motor systems so I'm not sure if there is a driver for those but I'm sure there would have to be since most BOBs do not supply enough current to run motors directly. In any case, having two 48V power supplies would indicate to me that each one individually cannot supply enough power for all the motors (including the 4th axis that you use occasionally). In this case, the two power supplies should be dedicated to specific components in the system. In fact, even with one power supply it is recommended to run separate leads to each motor driver to reduce cross-talk potential. Depending on how your system is currently wired, this could be contributing to some of the issue if you've simply daisy-chained the power from one motor driver to another. But I suspect it is an issue with the amount of current the single power supply is delivering as compared to the current required to run the three motors - let alone the 4th one on occasion. And the fact the the X and Y motors do not operate smoothly after sitting a while indicates the possibility that the remaining single power supply may be failing as well.
If you have not already done so, make sure you have completely disconnected the failed power supply as this could be loading down the other one.
Otherwise, I think your new power supplies should help eliminate this problem as long as you have also made sure your motor driver power leads are not daisy-chained one to another. And as robertspark has indicated, make sure your grounding is proper and you do not end up with a non-isolated connection to your computer.
Stephen "Highspeed" Kruse
EDIT: I re-read your original post and realized that you did mention drivers even for the servo motors. So definitely check that you are not daisy-chaining power leads between these and instead run power leads for each driver directly to the power supply. Again, make sure the total load (current draw) for all drivers connected to a given power supply do not exceed the rating for that power supply.
If you have not already done so, make sure you have completely disconnected the failed power supply as this could be loading down the other one.
Otherwise, I think your new power supplies should help eliminate this problem as long as you have also made sure your motor driver power leads are not daisy-chained one to another. And as robertspark has indicated, make sure your grounding is proper and you do not end up with a non-isolated connection to your computer.
Stephen "Highspeed" Kruse
EDIT: I re-read your original post and realized that you did mention drivers even for the servo motors. So definitely check that you are not daisy-chaining power leads between these and instead run power leads for each driver directly to the power supply. Again, make sure the total load (current draw) for all drivers connected to a given power supply do not exceed the rating for that power supply.