Dear person in charge,
We are suffering from the following gate driver fault on our original board using MCT8329A. Could you please tell me in detail under what conditions this error occurs?
Except for the following driver fault, no other faults are Hi in the register, and only the 31st bit fault is Hi.
Best Regards,
Tomofumi Okamoto
Hi Joshua,
This is a dump of all the register settings when the fault occurs.
There is no detailed gate driver fault.
{
"signature": "oneui-register-data",
"data": [
[
{
"idx": 0,
"id": "isd_config",
"value": "0x6E404502"
},
{
"idx": 1,
"id": "motor_startup1",
"value": "0x5ABB6E77"
},
{
"idx": 2,
"id": "motor_startup2",
"value": "0x77516343"
},
{
"idx": 3,
"id": "closed_loop1",
"value": "0x071E17FC"
},
{
"idx": 4,
"id": "closed_loop2",
"value": "0x03AA00BA"
},
{
"idx": 5,
"id": "closed_loop3",
"value": "0x34C92001"
},
{
"idx": 6,
"id": "closed_loop4",
"value": "0x601ADF44"
},
{
"idx": 7,
"id": "const_speed",
"value": "0x00100101"
},
{
"idx": 8,
"id": "const_pwr",
"value": "0x11200280"
},
{
"idx": 9,
"id": "150_deg_two_ph_profile",
"value": "0x24DB7200"
},
{
"idx": 10,
"id": "150_deg_three_ph_profile",
"value": "0x48DB6946"
},
{
"idx": 11,
"id": "ref_profiles1",
"value": "0x0E0CCE4F"
},
{
"idx": 12,
"id": "ref_profiles2",
"value": "0x78C99A5B"
},
{
"idx": 13,
"id": "ref_profiles3",
"value": "0x160E65F8"
},
{
"idx": 14,
"id": "ref_profiles4",
"value": "0x00001326"
},
{
"idx": 15,
"id": "ref_profiles5",
"value": "0x5CA67300"
},
{
"idx": 16,
"id": "ref_profiles6",
"value": "0x007F8000"
}
],
[
{
"idx": 0,
"id": "algo_ctrl1",
"value": "0x40000000"
},
{
"idx": 1,
"id": "device_ctrl",
"value": "0x00000000"
}
],
[
{
"idx": 0,
"id": "ana_trim3",
"value": "0x48004800"
},
{
"idx": 1,
"id": "ana_trim4",
"value": "0x2F00000000"
},
{
"idx": 2,
"id": "ana_trim5",
"value": "0x0000002F"
},
{
"idx": 3,
"id": "ana_trim6",
"value": "0x00000000"
},
{
"idx": 4,
"id": "ana_trim7",
"value": "0x00E219DE"
},
{
"idx": 5,
"id": "ana_trim8",
"value": "0x00005037"
},
{
"idx": 6,
"id": "ana_trim9",
"value": "0x009DD81C"
},
{
"idx": 7,
"id": "ana_trim10",
"value": "0x5378013C"
}
],
[
{
"idx": 0,
"id": "fault_config1",
"value": "0x71783720"
},
{
"idx": 1,
"id": "fault_config2",
"value": "0x75E4C03A"
}
],
[
{
"idx": 0,
"id": "gate_driver_fault_status",
"value": 0
},
{
"idx": 1,
"id": "controller_fault_status",
"value": "0x00000000"
}
],
[
{
"idx": 0,
"id": "gd_config1",
"value": "0x000783FF"
},
{
"idx": 1,
"id": "gd_config2",
"value": "0x00000000"
}
],
[
{
"idx": 0,
"id": "pin_config1",
"value": "0x20600004"
},
{
"idx": 1,
"id": "pin_config2",
"value": "0x3E1020AA"
},
{
"idx": 2,
"id": "device_config",
"value": "0x27104008"
}
],
[
{
"idx": 0,
"id": "sys_status1",
"value": "0x00A091EA"
},
{
"idx": 1,
"id": "sys_status2",
"value": "0x50010000"
},
{
"idx": 2,
"id": "sys_status3",
"value": "0x00000000"
}
]
]
}
On debug window in our system, gate driver fault is also occured.
However there is no detaild error information.
Best Regards,
Tomofumi Okamoto
Hi Okamoto-san,
If a loss of sync error occurs then the Motor lock fault will also occur, this is because Motor Lock will be raised if either of the following faults occur: Abnormal Speed, Loss of Sync, or No Motor.
Based on the fault settings in the register config you provided, the motor lock (this includes Loss of Sync) is set to retry after t_CLK. This settings is what is causing the nfault pin to drop continuously, if you set it to Latch the device should stop after the first instance of a Loss of Sync fault is detected.
For the LOSS_OF_SYNC errors, we have a guide for debugging this issue in the MCT8329A_GUI on dev.ti.com. To get to the guide, click on the gear icon -> Essential Controls -> fault handling -> Loss of Sync:
When the motor losses sync the motor will either vibrate or stall. Since it seems like the motor is stalling decreasing open loop acceleration A1 [OL_ACC_A1] and open loop acceleration A2 [OL_ACC_A2] may help to resolve the motor stall issues. If the motor vibrates you can try to increase align time [ALIGN_TIME] and decrease the closed loop acceleration [CL_ACC].
Can you please try and follow this guide, if you have not already, to eliminate the Loss of Sync fault?
Regards,
Joshua