3 fans on tool board 1lc?
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@gnydick Thanks - I think that is what I am going to do too. Or I might just only have one blower fan.
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@dwuk Now wired up.
One of my blower fans is 2 wire and the other 3 - so I think that works quite well.
Only issue I had was finding gnd for out_2. Ended up taking it off of IO1.
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@dwuk Update
First tried with 3 fans connected to +VOUT and GND on both Out1 and Out2.
- Fans were permanently on full speed.
Next tried with3 fans connected with out1/out2 and GND.
- None of the fans would work.
Finally found some more documentation that says you have to connect the red wires to +VOUT and Negative connections Out1 and Out2. - even though the diagram for the 1LC says that these are VIN or 12v+
- Tried that and it seemed to be working - but then I got burning smell from 2 pin fan (which was connected to the same Red and Black as the 3 pin fan).
Good news though is that the 3 pin Hotend and cooling fans both now work properly.
I think however that the 2 pin fan is fried - so will have to get another one and work out how to connect it. -
@dwuk Unless labelled otherwise (eg '5V PWM' for servos on the Mini 5+), all OUT and IO headers are switched on the Ground side, it's just how MOSFETs work. I tend to agree with you that the 'KEY' on the wiring diagram could be better labelled, and rather than "PWM V_IN" or "PWM V_FAN" it should perhaps be "PWM GND". I've made @T3P3Tony aware of this. As far as I can tell it's marked the same on every wiring diagram!
Are the fans running on 24V or 12V VIN, or 12V from the voltage regulator? There's a current limit if running from the 12V regulator, see https://docs.duet3d.com/Duet3D_hardware/Duet_3_family/Duet_3_Toolboard_1LC#operating-limits
800ma total (OUT_1 and OUT_2 pins only, when 12V selected)
If powered from VIN, there's a 2A current limit (what the pins and connectors can cope with), see https://docs.duet3d.com/Duet3D_hardware/Duet_3_family/Duet_3_Toolboard_1LC#description-of-connections
OUT_1 : 4-wire fan output (also accepts a 2- or 3-wire fan) intended for use as the print cooling fan. 2A total max current for OUT1 and OUT2 when VIN selected (v1.1 board), 0.8A total max current for OUT1 and OUT2 on 12V.
Some blower fans might be drawing too much current, and kill the MOSFET.
Ian
TronXY X5S with Duet 3 MB6HC and Roto toolboard : Cartesian bed-slinger with Duet 3 Mini 5+ WiFi and 1LC : RRP Fisher Delta v1 with Duet 2 Maestro : Polargraph with Duet 2 WiFi
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All the fans I am running are 24v.
The 2 pin one I think fried say 0.5a on it - I connected to Out2 on the black wire and +Vout on the red wire (in parallel to a 3 pin fan on the same two wires (plus also out2.tach).I still have another one of these two pin fans on the other print head that is still connected to the Klipper board at the moment - so will check what voltages are going to that.
Will try running the fans individually connected next to see if it is just both fans being on the same output that is causing them to break.
