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DRV8886: What is DRV8886's behavior when the stepper hit a hard stop?

Prodigy 20 points
Chiyuan Chiang

Replies: 2

Views: 33

Part Number: DRV8886

Hi,

I am using the DRV8886 to drive a stepper motor. The stepper motor drives a gear-train and move a acme screw. I would like to know the DRV8886's behavior when the stepper hit a hard stop. Would the DRV8886 announce a fault? According to the datasheet, the over current fault is 3A. I am planning to set full scale current for the DRV8886 to be 0.5A. So, if DRV8886 announce a fault, what fault would it be. Or, the stepper will consume all the remaining steps (not moving the acme screw) and not announce a fault?

thanks in advance for your help,

C. Chiang 

Prodigy 20 points
Chiyuan Chiang
  • Prodigy 114905 points
    Rick Duncan

    Hi C.Chiang,

    The DRV8886 will not announce a fault when the stepper hits a hard stop.

    When the DRV8886 hits a hard stop, each step command will change the current per the indexer table.

    When the step inputs stop, the current will remain stable.

    The DRV8886 and other stepper motor drivers regulate current. This means an overcurrent event should not occur due to a hard stop.

    Best Regards,
    Rick Duncan
    Motor Applications Team

  • Prodigy 20 points
    Chiyuan Chiang

    In reply to Rick Duncan:

    Thank you Rick

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