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MCF8316AEVM: Mismatch in Potentionmeter position

Sujeesh v
Prodigy 105 points
Part Number: MCF8316AEVM

Dear Team,

Recently we received MCF8316AEVM from TI. Upon going through the documents I found some mismatch in the procedures.

As per the Quick Start Guide (SLLU338 – AUGUST 2021) "5. Turn the potentiometer fully clockwise to set the motor to zero speed upon powerup.". So, I kept the potentiometer fully clockwise and started following tuning guide.

As per the "Figure 2-2. MCx8316A EVM Jumper Configuration" in Tuning Guide (SLLU335A – AUGUST 2021 – REVISED JANUARY 2022) also, the potentiometer has to be turned fully clockwise.

But when coming to "3.5 Testing for Successful Startup into Closed Loop" step 1 says to "Apply a nonzero speed command" by "If the speed input mode is Analog, rotate the Speed Control potentiometer (R4) clockwise to control the motor speed. Once the speed command is issued, the device will start commutating and the motor should start spinning that is proportional to the voltage on the Speed Pin."

This a completely not possible, as the potentiometer is already completely turned to clockwise.

Please verify and let us know if there is any mistake in the procedure.

Thanks and Regards,

Sujeesh V

  • +1
    TI__Mastermind 26756 points

    Hi Sujeesh,

    Thank you for bringing this discrepancy to our attention! Before powering on the EVM you want to turn the potentiometer all the way clockwise, and then once the EVM is powered up and you are ready to spin the motor you can turn the potentiometer counterclockwise to begin spinning the motor. Sorry for the confusion in section 3.5, that needs to be changed to counterclockwise.

    Regards,

    Anthony Lodi

  • 0 in reply to Anthony Lodi
    Prodigy 105 points

    Hi Anthony,

    Thanks for your update.

    Similarly there is another issue in the same Tuning Page under section 3.5 "Set zero speed command by turning off the PWM, turning the potentiometer completely counterclockwise, or setting the I2C command percentage to 0%.". Here it is mentioned to rotate counterclockwise to give zero command.

    I think this also needs to be updated accordingly.

    Regards,

    Sujeesh V

  • 0 in reply to Sujeesh v
    TI__Mastermind 26756 points

    Hi Sujeesh,

    Thanks for bringing this to our attention, I will pass the information along.

    Regards,

    Anthony Lodi