Hi @roboteer,
I’m sorry about the delayed response.
I’ve look into this matter and I was able to reproduce the issue with the beta test units that were distributed before the OpenRB-150 is officially released.
The work around for this 12V issue is to short the jumper in the back of the OpenRB-150 and bypass the FET switch.
By doing this, DYNAMIXEL will be powered whenever the power is supplied regardless of status of the power enable pin.
Fortunately, the same issue has not been observed in the final OpenRB-150 product that are currently sold as there were design updates right before the product release.
Thank you very much.