Controlling two fans at the same time
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I found out that PWM is not working properly when connecting two fans in parallel to one port. I have two electronics bay fans, would like to connect them seperately to two ports but it would be very nice if I still can control them parellel. Is that anyhow possible?
Thx.
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@martinnyhc
Yes....Find it in the example
https://duet3d.dozuki.com/Wiki/Gcode#Section_M563_Define_or_remove_a_toolEdit:
Maybe I misunderstood you, the example is for 2 fans on the printhead -
In my case the fans are tool independent because they are for the electronics bay.
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One possibility would be to do this with conditional GCode.
Another would be to use fans that loop through the PWM signal.
Search for PWM Sharing (PST)
In the PC I have some from Arctic . -
What about them doesn't work? The usable frequency range may be reduced, but it should still work. Unless the fans are particularly picky.
I use 2 sunon 40mm fans in parallel for my electronics enclosure with this setup and it works ok.
M950 F2 C"fan2" Q15000 ; create fan 2 on pin fan2 and set its frequency M106 P2 S0.33 H1:0 T45 B0.5 ; set fan 2 value. Thermostatic control is turned on -
@martinnyhc said in Controlling two fans at the same time:
I found out that PWM is not working properly when connecting two fans in parallel to one port. I have two electronics bay fans, would like to connect them seperately to two ports but it would be very nice if I still can control them parellel. Is that anyhow possible?
Thx.
2-wire fans are not designed to work with PWM. It's a miracle that so many of them do.
If you connect two dissimilar fans in parallel, then I am not surprised of they behave oddly when you PWM them. But if they are identical fans, I would expect a parallel connection to work.
