MCF8316AEVM: Can not spin low-resistance motor

Hi YN, 

Thanks for posting to the e2e forum - our team is looking into your request and will try to respond with an updated answer by middle of next week 

Best Regards, 
Andrew 

Hi YN,

Can you check if you are auto-reading registers over I2C communication? If so, then can you disable auto-read and try again. Your motor resistance is too low, so the motor draws pretty high current and triggers current limit. Can you set the ILIMIT to a lower value and try if this helps? Please use align as the startup method. Is it possible to share the oscilloscope screenshot of the motor phase current ?

Regards,

Vishnu

Hi, thanks for the fast reply.

I tried your suggestions but nothing changed.

In fact I tried to to run the motors I previously was able to spin and now have the same clicking behavior, so I suspect a hardware fault.

Unfortunately I don't have a current probe yet, but here is what happens with voltage between one of the phases (C) and PGNG. Peaks like these appear with a frequency of ~2.5 Hz making motor to click like a metronome. For your reference, the board is powered by a 15V power supply.

Is there a way to check that these's no hardware issue with the board? Is there a way to reset it to factory state other than writing Recommeneded Default Values as per Guided Tuning wizard?

Does this happen when you try to run MPET or after programming the motor parameters? Can you make sure the align, open loop current and the ILIMIT current (Current ref for torque loop PI controller) are set to lower values (<0.5A)?

Regards,

VIshnu  

Hello, 

I confirm that I set the mentioned currents to 0.25A as suggested (please see the the contents of regs.json below), and this didn't change the behavior.

The continuous clicking only happens when I try to run MPET without motor parameters configured.

If I try to run the motor with parameters configured manually (MOTOR_RES = 0.04, MOTOR_IND = 0.06, MOTOR_BEMF_CONST = 14.0 ), this instantly triggers Overcurrent Protrction [OCP] and Overcurrent: HighSide OUTA [OCP_HA] faults, without any activity on the motor (noticeable movement or audible clicks). I noticed that these faults are getting triggered even if there's no motor connected, and it's always the same  [OCP_HA] that is triggered.

{
  "signature": "oneui-register-data",
  "data": [
    [
      {
        "idx": 0,
        "id": "isd_config",
        "value": "0x44638C20"
      },
      {
        "idx": 1,
        "id": "rev_drive_config",
        "value": "0x283AF064"
      },
      {
        "idx": 2,
        "id": "motor_startup1",
        "value": "0x0B6207D0"
      },
      {
        "idx": 3,
        "id": "motor_startup2",
        "value": "0x0B066000"
      },
      {
        "idx": 4,
        "id": "closed_loop1",
        "value": "0x0C3181B0"
      },
      {
        "idx": 5,
        "id": "closed_loop2",
        "value": "0x1AAD0000"
      },
      {
        "idx": 6,
        "id": "closed_loop3",
        "value": "0x00000000"
      },
      {
        "idx": 7,
        "id": "closed_loop4",
        "value": "0x00001770"
      },
      {
        "idx": 8,
        "id": "speed_profiles1",
        "value": "0x00000000"
      },
      {
        "idx": 9,
        "id": "speed_profiles2",
        "value": "0x00000000"
      },
      {
        "idx": 10,
        "id": "speed_profiles3",
        "value": "0x00000000"
      },
      {
        "idx": 11,
        "id": "speed_profiles4",
        "value": "0x00000000"
      },
      {
        "idx": 12,
        "id": "speed_profiles5",
        "value": "0x00000000"
      },
      {
        "idx": 13,
        "id": "speed_profiles6",
        "value": "0x00000000"
      }
    ],
    [
      {
        "idx": 0,
        "id": "fault_config1",
        "value": "0x0FE80206"
      },
      {
        "idx": 1,
        "id": "fault_config2",
        "value": "0x74000000"
      }
    ],
    [
      {
        "idx": 0,
        "id": "pin_config",
        "value": "0x00000002"
      },
      {
        "idx": 1,
        "id": "device_config1",
        "value": "0x00100000"
      },
      {
        "idx": 2,
        "id": "device_config2",
        "value": "0x0000B000"
      },
      {
        "idx": 3,
        "id": "peri_config1",
        "value": "0x40000000"
      },
      {
        "idx": 4,
        "id": "gd_config1",
        "value": "0x00000100"
      },
      {
        "idx": 5,
        "id": "gd_config2",
        "value": "0x00200000"
      }
    ],
    [
      {
        "idx": 0,
        "id": "ana_trim3",
        "value": "0x48004800"
      },
      {
        "idx": 1,
        "id": "ana_trim4",
        "value": "0x00000000"
      },
      {
        "idx": 2,
        "id": "ana_trim5",
        "value": "0x80000013"
      },
      {
        "idx": 3,
        "id": "ana_trim6",
        "value": "0x00000000"
      },
      {
        "idx": 4,
        "id": "ana_trim7",
        "value": "0x00000000"
      },
      {
        "idx": 5,
        "id": "ana_trim8",
        "value": "0x80000824"
      },
      {
        "idx": 6,
        "id": "ana_trim9",
        "value": "0x0045A760"
      },
      {
        "idx": 7,
        "id": "ana_trim10",
        "value": "0xD36E1139"
      }
    ],
    [
      {
        "idx": 0,
        "id": "int_algo_1",
        "value": "0x00B3407D"
      },
      {
        "idx": 1,
        "id": "int_algo_2",
        "value": "0x000001A7"
      }
    ],
    [
      {
        "idx": 0,
        "id": "gate_driver_fault_status",
        "value": "0x00000000"
      },
      {
        "idx": 1,
        "id": "controller_fault_status",
        "value": "0x00000000"
      }
    ],
    [
      {
        "idx": 0,
        "id": "algo_status",
        "value": "0x0FF90300"
      },
      {
        "idx": 1,
        "id": "mtr_params",
        "value": "0x00000000"
      },
      {
        "idx": 2,
        "id": "algo_status_mpet",
        "value": "0x0A000000"
      }
    ],
    [
      {
        "idx": 0,
        "id": "dev_ctrl",
        "value": "0x00000000"
      }
    ],
    [
      {
        "idx": 0,
        "id": "algo_ctrl1",
        "value": "0x80000000"
      },
      {
        "idx": 1,
        "id": "algo_ctrl2",
        "value": "0x00000000"
      },
      {
        "idx": 2,
        "id": "current_pi",
        "value": "0x000C0701"
      },
      {
        "idx": 3,
        "id": "speed_pi",
        "value": "0x00000000"
      },
      {
        "idx": 4,
        "id": "dac_1",
        "value": "0x00000000"
      },
      {
        "idx": 5,
        "id": "dac_2",
        "value": "0x00000000"
      }
    ],
    [
      {
        "idx": 0,
        "id": "algorithm_state",
        "value": "0x00000000"
      },
      {
        "idx": 1,
        "id": "fg_speed_fdbk",
        "value": "0x7FFFFFFF"
      },
      {
        "idx": 2,
        "id": "bus_current",
        "value": "0x00000000"
      },
      {
        "idx": 3,
        "id": "phase_current_a",
        "value": "0x00060000"
      },
      {
        "idx": 4,
        "id": "phase_current_b",
        "value": "0x00010000"
      },
      {
        "idx": 5,
        "id": "phase_current_c",
        "value": "0xFFF90000"
      },
      {
        "idx": 6,
        "id": "csa_gain_feedback",
        "value": "0x00010003"
      },
      {
        "idx": 7,
        "id": "voltage_gain_feedback",
        "value": "0x00000001"
      },
      {
        "idx": 8,
        "id": "vm_voltage",
        "value": "0x021B0000"
      },
      {
        "idx": 9,
        "id": "phase_voltage_va",
        "value": "0x000376CF"
      },
      {
        "idx": 10,
        "id": "phase_voltage_vb",
        "value": "0x0003E5A9"
      },
      {
        "idx": 11,
        "id": "phase_voltage_vc",
        "value": "0x00022A41"
      },
      {
        "idx": 12,
        "id": "sin_commutation_angle",
        "value": "0xFFCE7490"
      },
      {
        "idx": 13,
        "id": "cos_commutation_angle",
        "value": "0x07FD6740"
      },
      {
        "idx": 14,
        "id": "ialpha",
        "value": "0x00050000"
      },
      {
        "idx": 15,
        "id": "ibeta",
        "value": "0x0002E302"
      },
      {
        "idx": 16,
        "id": "valpha",
        "value": "0xFFFE2648"
      },
      {
        "idx": 17,
        "id": "vbeta",
        "value": "0xFFBCCE72"
      },
      {
        "idx": 18,
        "id": "id",
        "value": "0x0004EC75"
      },
      {
        "idx": 19,
        "id": "iq",
        "value": "0x00030118"
      },
      {
        "idx": 20,
        "id": "vd",
        "value": "0xFFFFC6E8"
      },
      {
        "idx": 21,
        "id": "vq",
        "value": "0xFFBCB73A"
      },
      {
        "idx": 22,
        "id": "iq_ref_rotor_align",
        "value": "0x00000000"
      },
      {
        "idx": 23,
        "id": "speed_ref_open_loop",
        "value": "0x00000000"
      },
      {
        "idx": 24,
        "id": "iq_ref_open_loop",
        "value": "0x00000000"
      },
      {
        "idx": 25,
        "id": "speed_ref_closed_loop",
        "value": "0x00000000"
      },
      {
        "idx": 26,
        "id": "id_ref_closed_loop",
        "value": "0x00000000"
      },
      {
        "idx": 27,
        "id": "iq_ref_closed_loop",
        "value": "0x00000000"
      },
      {
        "idx": 28,
        "id": "isd_state",
        "value": "0x00000000"
      },
      {
        "idx": 29,
        "id": "isd_speed",
        "value": "0x00000000"
      },
      {
        "idx": 30,
        "id": "ipd_state",
        "value": "0x00000000"
      },
      {
        "idx": 31,
        "id": "ipd_angle",
        "value": "0x00000000"
      },
      {
        "idx": 32,
        "id": "ed",
        "value": "0x00000000"
      },
      {
        "idx": 33,
        "id": "eq",
        "value": "0x00000000"
      },
      {
        "idx": 34,
        "id": "speed_fdbk",
        "value": "0x00000000"
      },
      {
        "idx": 35,
        "id": "theta_est",
        "value": "0x00000000"
      }
    ]
  ]
}

Hi YN, 

Thanks for the additional info 

Best Regards, 
Andrew 

YN,

You hear the clicking noise because the MPET IPD fails. If you see overcurrent fault getting triggered even without the motor connected then the device is most likely damaged. Did you make sure the motor startup is configured to Align and not IPD?  

Regards,

Vishnu

Hello,

Yes I can confirm that I have OCP kicking in even when motor is not connected with motor startup is configured to Align.

So I conclude that I have a faulty board. Still this is strange because I didn't do anything that could have damaged the board. The board was purchased directly from TI, would it be possible to return/exchange it?

YN,

Just to confirm, can you measure the resistance across OUTx (A, B and C) and GND using a DMM? Please check your message inbox. I have requested for your shipping address.  

Regards,

Vishnu

Yes, the resistance between C and B to PGND is ~14 kOhm while A to PGND is < 1 Ohm, which I suppose confirms the hardware issue  

What I ask myself (and what may be useful for other members) is how I managed to kill it. I only tried to run the motor mentioned above. Is it possible to kill the part by attaching a non-suited motor? Shouldn't it have a protection against short circuits between outputs?