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DRV8353RS-EVM: FAULT light blinking issue

Cherry Zhou
Mastermind 22235 points
Part Number: DRV8353RS-EVM

Hi team,

Here's an issue from the customer may need your help:

The motor accelerates to more than 1000 turns, or at 300 turns, the FALUT light goes from dark to light, and is blinking all the time. 

Could you help resolve this case? Thanks.

Best Regards,

Cherry

  • 0
    TI__Mastermind 26046 points

    Hi Cherry,

    Please describe what is happening in the application firmware with the motor. Is it being identified using the sensorless-FOC control? Does the motor spin the 300 turns before nFAULT reappears? If the motor does not spin, is the inductance and resistance estimation current set high enough in the GUI?

    nFAULT would only clear immediately if you are using automatic retry mode for fault protections such as overcurrent, or if there is marginal undervoltage at VGLS or CPUV. Is it possible to determine if any SPI status bits are being set when the nFAULT condition appears?

    Could you also try setting the overcurrent into latched shutdown mode in SPI to see if nFAULT gets stuck if overcurrent is happening? If so, consider increasing the VDS overcurrent settings to higher values if there are marginal overcurrent faults triggering nFAULT each PWM cycle. 

    The goal is to determine what is causing the nFAULT to blink first before making any fixes. 

    Thanks,
    Aaron

  • 0 in reply to Aaron Barrera
    TI__Mastermind 22235 points

    Hi Aaron,

    Thanks for your help.

    The latch shutdown and report-only modes are attempted and the nFAULT light turns on when powered up. Try to read SPI with GUI, light off, SPI is not set at 1.

    Thanks and regards,

    Cherry

  • 0 in reply to Cherry Zhou
    TI__Mastermind 26046 points

    Hi Cherry,

    When board is powered up, does the FAULT LED go away when they plug in the Launchpad and launch the GUI? If the LP is mated into the EVM, the EVM is powered on, but the LP is not connected and GUI isn't running, then the tri-state outputs of the MCU could be putting the EVM into a strange state. The GUI will take the ENABLE signal high and configure SPI correctly. 

    Thanks,
    Aaron