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MCF8329EVM: OCP_VDS_FAULT

Rafael Vidal
Prodigy 10 points
Part Number: MCF8329EVM

Tool/software:

Hi, we are developing a medical device using a 24V BLDC motor (R=0,15ohm; L=0,12mH), peak current 10A. We managed to spin it with the EVM board and MPET without any load. The moment we applied a load appeared DRIVER_FAULT message.

Next step, as the peak current is 10A we have changed Rsense on the board to 0.004ohm, and set BASE_CURRENT=0x100. Now we are not able to spin the motor even without load, DRIVER_FAULT and OCP_VDS_FAULT message appears.

What might be the problem? CSA_GAIN=40, SEL_VDS_LVL=2.0V

thanks.

  • 0
    TI__Genius 12215 points

    Hi Rafael,

    Could you provide me your current register configuration so that I can look over your settings like the current limits and gate driver settings?

    Also, I would recommend setting the BASE_CURRENT to 0x200 and set the CSA_GAIN to 20V/V, his will set the max current that the internal CSA can measure to 18.75A. Once the BASE_CURRENT is set, adjust all the current limits accordingly. We recommend setting HW_LOCK_ILIMIT and LOCK_ILIMIT above the max peak phase current of the motor and to set the other current limits like ILIMIT, OL_ILIMIT, etc. less than or equal to the max peak phase current of the motor.

    Regards,

    Joshua