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MCF8315D: Failed to start up in 5V system

Zoey Wu
Expert 6585 points

Part Number: MCF8315D

hi team,.

 

my customer is using MCF8315D in 5V system and it shows the problem as attached picture shows.

Could u kindly help to give any advise? thanks!

 

615f49eceb11d461a43a6bf4ecc43caf.jpeg

  • 0
    TI__Expert 7190 points

    Hi Zoey,

    Please confirm that the entered motor's basic parameters (rated current and speed) are in accordance with the motor specifications. The motor's rated current must correspond to the motor phase current at the rated speed.

    Additionally, please attempt to run the SmartTune function without entering motor parameters {optional).

    Thanks,

    Dhinesh

  • 0 in reply to Dhinesh
    TI__Expert 6585 points

    Hi Dhinesh,

    I will let customer try this.

    But do u think it will cause any problems when supply with 5V system. thanks!

  • 0 in reply to Zoey Wu
    TI__Expert 7190 points

    Hi Zoey,

    Do you observe the motor spinning during the smart tune operation? If the motor phase current is insufficient, the motor may fail to spin, which can trigger an MPET BEMF fault.

    Additionally, allow the smart tune function to calculate the motor resistance (R), inductance (L), and BEMF parameters automatically. Entering incorrect values for these parameters can also trigger MPET BEMF faults.

    I recommend verifying motor rotation during smart tune and ensuring the system calculates these motor parameters rather than using manually entered values.

    Thanks,

    Dhinesh