MCT8329A: Motor Lock Detection

Conor

Part Number: MCT8329A

Hi,

■Question 1: Loss sync times
Loss of sync is one of Motor Lock Detection. When are Loss sync times cleared? For example, when the power is turned on and a command value of a certain rotation speed is input, the motor will rotate, but if the command value is 0 rotations (stopped), will the Loss sync times be cleared? Or does it hold the previous value and accumulate until the power is turned off?

■Question 2: Loss of Sync
Loss of sync is one of the detections of Motor Lock Detection. Am I correct in my understanding that if Loss of sync is disabled, even if Loss of sync is detected, it will not be detected as a motor lock error?

■Question 3: Motor Lock Detection
Is it correct to understand that Motor Lock Detection starts operating after the motor starts from open-loop control to closed control?

Thanks,

Conor

7 months ago

0 Joshua Horlander Cruz 7 months ago

TI__Genius 15790 points

Hi Conor,

Question 1: Loss of Sync times

I will have to check with our firmware team on this. I will aim to provide an update by Friday at the latest.

Question 2: Loss of Sync

Your understanding is correct. If you disable Loss of Sync using the LOSS_OF_SYNC_EN bit the MCT8329A will not detect any LOSS of SYNC faults even if they occur. This does mean that any Motor Lock error that appears will not be caused by a Loss of Sync fault.

Question 3: Motor Lock Detection

A Motor Lock fault occurs if either a abnormal speed, no motor, or loss of sync fault occurs. Generally the abnormal speed and loss of sync detections occurs during closed loop control while no motor detection occurs any time the motor is being commanded to spin so even at motor startup.

Regards,

Joshua

0 Conor 7 months ago in reply to Joshua Horlander Cruz

Mastermind 9870 points

Hi Joshua,

Joshua Horlander Cruz said:
I will have to check with our firmware team on this. I will aim to provide an update by Friday at the latest.

OK. I look forward to your reply regarding Q1.

Thanks,

Conor

0 Conor 7 months ago in reply to Joshua Horlander Cruz

Mastermind 9870 points

Hi Joshua,

Do you have any update about Q1？

Thanks,

Conor

0 Joshua Horlander Cruz 7 months ago in reply to Conor

TI__Genius 15790 points

Hi Conor,

I am still waiting for a response from our firmware team on Q1. I will get back with you by Wednesday.

Regards,

Joshua

0 Conor 7 months ago in reply to Joshua Horlander Cruz

Mastermind 9870 points

Hi Joshua,

OK, I look forward to your reply regarding Q1.

Thanks,

Conor

0 Joshua Horlander Cruz 7 months ago in reply to Conor

TI__Genius 15790 points

Hello Conor,

The loss of sync count is reset when the motor is commanded to stop or if a zero crossing (ZC) is detected. The loss of sync counter will begin to count if a ZC is not detected. The detection for ZC is retried LOSS_SYNC_TIMES and if the ZC is still not detected after LOSS_SYNC_TIMES then the loss of sync fault is asserted.

Regards,

Joshua

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MCT8329A: Motor Lock Detection