Manually Moving Bed Issue  

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Sayum
(@sayum)
Active Member

I just noticed something on my mini, which i'm not sure is a known issue or not but figured it was worth highlighting. If you manually move the bed,  it causes the backlight on the screen to illuminate. This seems like a potential problem to me, albeit very niche. Shouldnt there be some reverse polarity protection on the stepper drivers? to not induce a voltage on the power rails?

Thoughts?

This topic was modified 2 months ago by Sayum
Posted : 19/04/2021 11:25 am
fuchsr
(@fuchsr)
Prominent Member

It's normal behavior, don't worry.

Posted : 19/04/2021 11:36 am
Fayoh
(@fayoh)
Eminent Member

Manually rotating any electric motor will cause it to act like a generator. So you backfeed the electronics from the motor instead of from the power supply.I

In practice this has not been found to cause any problems. There's some video on youtube (I mean, of course there is. How could it not be 😅) Where someone really tries to force the motor to induce some kind of fault in the electronics, but nothing happened.

Posted : 19/04/2021 12:10 pm
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