MCT8329A: LOSS OF SYNC error

Cédric Chépied

Prodigy 20 points

Part Number: MCT8329A

Tool/software:

Hi,

I am configuring the MCT8329A with the following register values:

ISD Config: 0x20804DC4


Motor Startup 1:     0x1D6AC1BB


Motor Startup 2:     0x4D35F5AA


Closed Loop 1:       0x1682A032


Closed Loop 2:       0x0C00006A


Closed Loop 3:       0x00000000


Closed Loop 4:       0x10000000


Constant Speed:      0x00000000


Constant Power:      0x445C0140


Fault Config 1:      0x67048029


Fault Config 2:      0x00000180


2-Phase Profile:     0x00000000


3-Phase Profile:     0x00000000


Reference Profile 1: 0x00000000


Reference Profile 2: 0x00000000


Reference Profile 3: 0x00000000


Reference Profile 4: 0x00000000


Reference Profile 5: 0x00000000


Reference Profile 6: 0x007F8000


Pin Config 1:        0x00000052


Pin Config 2:        0x3E00014D


Device Config:       0x00000000


GD Config 1:         0x0005823B


GD Config 2:         0x00000000

RSHUNT = 0.001 Ohm

In FAULT_CONFIG2, LOSS_OF_SYNC_EN = 0.
However, while the motor is running, I sometimes see MOTOR_LOCK errors and CONTROLLER_FAULT_STATUS = 0x80500000, which indicates a LOSS_OF_SYNC error.

Why is this error being detected if loss-of-sync detection is disabled?
When this happens, the MCT8329A restarts the motor.

My goal is for the ESC to detect when something actually stops the motor (at startup or while spinning), but I want to avoid false detections. I would be very grateful if you could suggest better register values to achieve this.

Thanks for your help.

Cédric

1 month ago

0 Dhinesh 1 month ago

TI__Expert 4085 points

Hi Cedric,

After disabling the loss of sync fault, did you write the settings into the EEPROM? if no, could you please check once after writing the setting into EEPROM?

Thanks,

Dhinesh

0 Cédric Chépied 1 month ago in reply to Dhinesh

Prodigy 20 points

Hi Dhinesh,

Yes I did, all the given values are read from EEPROM.

0 Dhinesh 1 month ago in reply to Cédric Chépied

TI__Expert 4085 points

HI Cedric,

I am debugging this issue, will update you with my observation shortly.

Thanks,

Dhinesh

0 Dhinesh 1 month ago in reply to Dhinesh

TI__Expert 4085 points

Hi Cedric,

Device fault algorithm considers the motor lock fault also as one of the reasons for loss of sync fault. could you please check by disabling or configuring the MTR_LCK_MODE as "Motor lock detection is in report only but no action is taken"?

Thanks,

Dhinesh

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MCT8329A: LOSS OF SYNC error