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DRV8301EVM Board Cause Power Supply Voltage Ramp Up

Elite Hsieh1
Prodigy 70 points
Other Parts Discussed in Thread: MOTORWARE

Hello,

I have two RDV8301EVM (w/ F28069 ISO Control Card) boards in my lab. I use one EVM board to drive a 3 phase sensorless motor. The PVDD connect to 24V which from 600W Power Supply. I run InstaSPIN_FOC_F2806x.exe app to drive this motor. When the Load of motor increase, the current also increase and PVDD keep to 24V (Both Current and Voltage value read from Power Supply Display). The current from Power Supply can reach to 10A when motor has max load and Voltage keep to 24V. The motor running fine at max load without any problem.

I change another EVM board, use same motor, setting and same Power Supply. When add load to motor, once the current reach to 1A then the Voltage ramp up to 26V ~ 34V rippled. The motor is still running but I didn't add load to increase current. Because I think some thing wrong in this EVM board. This EVM board work fine before but today I encounter  this symptom. Now this EVM board can complete Identify Motor and running without load at low speed. But when I add load to 1A, the Voltage ramp up from 24V to above 30V. The Power Supply didn't damaged after I check it.

So, I need help to know where can I check or which parts in EVM board may damaged. Thanks in advance.

  • 0
    TI__Guru** 119560 points
    Is the load motor inverter connected to the same 24V 600W supply?

    it's possible you damaged your voltage/current sensing circuits, but I would expect motor ID to either fail or give you different motor parameters than your other board. they are the same parameters IDd?

    if you use MotorWare, say proj_lab02a, you can view the ADC offsets after you start the ID process
    hal.adcBias.V.value[#]
    hal.adcBias.I.value[#]

    the sets of V should be similar, and the sets of I should be similar.
  • 0
    TI__Mastermind 21320 points

    Elite,

    As Chris said, it sounds like some issue in the feedback circuits. Can you check all the ADC pins (voltage and current) to verify if all signals are present and look appropriate.

    Can you also check that all of the half-bridges are switching correctly? This can be done by monitoring the motor outputs and ensuring each one is switching properly.

  • 0 in reply to Nicholas Oborny
    Prodigy 70 points
    Hi Chris and Nicholas,
    Thanks for your reply. Since C2000 and InstaSPIN FOC are new for me, so I spend more time to study TI document. Today I discuss this issue with Taiwan TI local FAE, he suggest use CCS instead of use web app to control my pump motor under heavy load. So, I need time to check this and tuning parameter in CCS code.

    - Elite Hsieh