topic_solved 12v fan for hotend help needed
OK. having an issue with getting 12v from Port 3 on the Duet5 for the new 12v Noctura Fan. This is an always on fan for the hotend.
According to this: https://www.instructables.com/id/Duex5-Use-Build-in-12v-Switching-Regulator-on-24v-/
But I dont have the PIN 1 shown in the instructable. I have the latest duet5 board which does not have spot 1.
I enter M106 P3 S1 and nothing happens.
obviously i'm missing something.
aidar last edited by
I dont have Duex, but from pictures there seems to be another jumper located between middle endstop and termistor connectors. Ist this for selecting 12v ?
See https://duet3d.dozuki.com/Wiki/Duex_wiring_diagrams. On the latest DueX boards, the INT_12V_EN jumper has been moved to the middle left hand edge of the board in that diagram.
StevenL last edited by StevenL
I did find the 12v enable pins on the left side. I placed a jumper on it and still nothing.
Not sure what I'm doing wrong. Would I be better off just using a DC-dc buck down converter (24v to 12v) off the original hotend fan pins ?
any ideas ?
Next to that jumper there is a 12V OUT connector. Do you measure 12V across its pins? Take great care not to short the pins together while you measure it.
This issue was I needed an S parameter. The 12v was enabled, but at a default 0 speed. so the fan was essentially off. I set M106 P8 S255 and the fan went on full.
bot last edited by bot
@stevenl you had the S parameter in your original post... maybe S1 doesn't work as it should? Or were you accidentally commanding P3 when the fan was actually connected to P8?
S1 needs to be S255
bot last edited by
S1 and S255 result in the exact same behaviour.