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DRV8313EVM GUI Timing Out

Jacob Sacks
Prodigy 125 points
Other Parts Discussed in Thread: DRV8313EVM, DRV8313

Hello,

I have a DRV8313EVM hooked up to a power supply at +12 V and connected to a laptop through the micro USB cable supplied with the board. It has been configured as instructed in the User Guide. The connection seems stable, as the flashing light on the GUI alternates between green and light green. However, everytime I enable the motors by checking the "Enable Motor" option, the connection goes bad after about 7 flashes of the GUI heartbeat. It then proceeds to alternate between green and red, and eventually times out. I cannot restore connection until restarting the board. However, this always happens when the "Enable Motor" option is selected.

I've tried this under different scenarios, including using an input voltage of +24 V as specified in the manual. I've also experimented with changing the JP1 jumper connection. Originally I had it between pins 1-2, but also tried shorting pins 2-3. Is it a problem with communication between the DRV8313 and the MCU? Or is the board faulty? Thanks in advance for your help!

Regards,

Jake

  • 0
    TI__Guru** 114905 points

    Hi Jake,

    Is the motor attempting to run when you check "Enable Motor"? If you are, can you check the nFAULT (pin 11 of J1)?

    If nFAULT is going low when you enable the motor, is it possible that the power supply is not able to hold the voltage above UVLO? This is common when using an align technique because two of the motor phases are energized to move the motor to a known position.

  • 0 in reply to Rick Duncan
    Prodigy 20 points

    I have a similar problem.   When I enable the motor the reset fault  turns red.  The motor gives one little jerk before the fault light comes on.  The connection light times out shortly there after

     

    I am using a small BLDC 3 phase motor bought from a RC hobby supply.  How can I tell if this motor is compatible with this EVM board.

     

    I checked pin 11 of J1 and it stays at 3.3V 

     

    Pete

  • 0 in reply to Pete Holden
    TI__Guru** 114905 points

    Hi Pete,

    Can you provide more information?

    What voltage are you using to power your board?
    How much current can the power supply provide?
    What model number is the motor you are using?
    What step of the user guide are you experiencing this problem? 

    Thank you.

  • 0 in reply to Rick Duncan
    TI__Expert 8885 points

    Pete,

     If after Enable command, motor does not start rotating the firmware detect it as block rotor condition and it make 12 attempts to start the motor before going to reset. This fault is treated as special case, in which GUI goes for time-out to inform user that something is wrong with motor windings, its connection with EVM (some time loose connection can lead to this issue) or the way motor is loaded. The GUI time-out won’t come if any fault occurs during normal running condition of motor.

     Please provide the information asked by Rick to enable us to understand the issue in more detail.

     Best Regards

    Milan-Motor Application Team

  • 0 in reply to Rick Duncan
    Prodigy 20 points

    running 24v  with a power supply capable of 4 amps have set the current up to 2.5 amps

    The motor is an e_sky  3800kv

    The problem starts as soon as I select the motor enable button

  • 0 in reply to Pete Holden
    TI__Mastermind 21320 points

    I believe this is an issue with the motor Pete. The Esky motors are high power RC helicopter/airplane brushless motors.

    From what I can find online the free load current is 2A which means the startup current will be even greater. The DRV8313 can only support 2.5A Peak and 1.75 RMS max in ideal conditions.

  • 0 in reply to Nicholas Oborny
    TI__Guru** 114905 points

    Hi Pete,

    As Nick said, this motor requires more current than the DRV8313 can provide under the conditions you are operating. You may be able to spin the motor at a lower voltage, but it is not certain. 10V is a good starting point since it is 2V above the minimum VM.