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dibyajyoti
dibyajyoti
Visitor II
November 30, 2016
Question

L6470 ext switch-SW-erratic behavior

  • November 30, 2016
  • 1 reply
  • 520 views
Posted on November 30, 2016 at 08:24

The releaseSW command is behaving erratically.

We have our own PCB based on ST design. On Power up GoUntil is executed. Limit Switch used is Omron EE-SX951-W.

GoUntil never fails and SW input is detected correctly all the time.

After GoUntil, ReleaseSW and Move are executed. Sometimes (unpredictably) ReleaseSW and Move are not executed.

Appreciate inputs for trouble-shooting this behavior.

   
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1 reply

Enrico Poli
Enrico Poli
ST Employee
January 20, 2017
Posted on January 20, 2017 at 10:53

When the algorithm fail, are both ReleaseSW and Move not executed?

I suggest you to check the following:

- The SW_MODE you set. By default a falling edge on the SW input causes an abrupt stop of the motor (hard-stop).

- The status of the SW input before you send the ReleaseSW command. The ReleaseSW stops the motor only at the SW input

RISING EDGE

. If the SW input is high, the command continues driving the motor (at very very low speed) until it falls low ad then returns high.

- The status of the BUSY pin/flag before sending the Move command. It is not possible to send a move when the device is busy.

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