Fan Issues

JADoglio

I am having issues with setting up my Hot end and Parts cooling fans on my Duet 3 Mini5+. I am using 2 wire fans for both. I am connecting the parts fan to "Out3" and the hot end fan to "Out 4". The hot end fan is being set up as thermostatically controlled where the parts fan is not. As you know, these are 4 pin connectors and the fans only use 2 as noted. Which pins should these fans be connected to? The only pins I seem to get to work at all are the GND and V_OUTLC1+. However, when I connect to these pins the fans run continuously from the moment power is applied and there is no control over their speed or what temperature they start or stop. I believe the config.g file has them setup correctly, but you tell me. Thanks[link text](M122.txt config.g.txt link url)

moth4017

@JADoglio

M950 F0 C"out6" Q250								; create fan 0 on pin fan0 and set its frequency
M106 P0 S0 H-1	C"Part Fan"							; set fan 0 value. Thermostatic control is turned off

M950 F1 C"out3" Q250								; create fan 1 on pin fan1 and set its frequency
M106 P1 S1 H1 T35	C"Extruder Fan"					; set fan 1 value. Thermostatic control is turned on

;Filter fan 12 v
M950 F2 C"out0" Q250								; create fan on output, set its frequency
M106 P2 S0 H-1  C"Filter Fan"						; set fan value. Thermostatic control is turned on

io out is - for the fan and + goes to the supply

achrn

@JADoglio assuming your fan has normal red and black wires: black wire to out3- or out4- (pin furthest from the 'power in' screw termninals in each 4-pin connector) and red wire to V_OUTLC1+ (second closest pin to the 'power in' screw termninals in each 4-pin connector).

You might need to play with the Q value in your M950 lines - I have a centrifugal fan for part cooling that seems happiest with a really low value - I use Q5.

Discussion of various configurations at https://docs.duet3d.com/en/User_manual/Connecting_hardware/Fans_connecting

JADoglio

@moth4017
Thanks for the help! I will try these suggestions tomorrow. I suspect they will solve the issue.

Also. I appreciate the link. The Duet support team is great and the documentation is phenomenal. Sometimes, it becomes a bit overwhelming and I don't see the trees for the forest. As in this case. The information is all there and I will have to do a better job finding it in the future. Thanks again to both of you for responding..