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Duet 0.6 and hot end fan

Posted by johnfroff 
Duet 0.6 and hot end fan
December 31, 2018 02:54PM
New to this, I have built and commisioned a Reprap Fisher with Duet 0.6 electronics, I think I originally wired the fan reverse polarity, after correcting the wires still doesn't work. Anybody have any idea if just the fan or the duet board will have blown too.

When i set the fan from the web interface the Fan led comes on, is this actually the fan i should be looking at. Is it work putting a scope on the output from the duet, I assume if it is PWM I should see a 19v square wave with mark space ratio changing as I increase setting on web.

Will operating the mosfet in open circuit damage it.

Any pointers would be appreciated
Re: Duet 0.6 and hot end fan
January 01, 2019 03:21AM
It's probably just the fan that has failed. Operating the MOSFET open circuit won't damage it.

Large delta printer [miscsolutions.wordpress.com], E3D tool changer, Robotdigg SCARA printer, Crane Quad and Ormerod

Disclosure: I design Duet electronics and work on RepRapFirmware, [duet3d.com].
Re: Duet 0.6 and hot end fan
January 01, 2019 05:37AM
Thanks for the reply, I was just worried the fan may have failed short which might damage the board.
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