Tool fan temp control again
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Firmware version? Is this with a 4 wire tach fan?
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@Phaedrux
FW 3.1.1
It is a three wire Fan. It makes no difference whether I connect the third wire or not. -
Then it is not a PWM tacho fan. The third wire is likely just an RPM sensor and can be ignored. The duet PWM control is done through switching of the negative leg.
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@Phaedrux
Fair enough, but whats the reason than that it is aways on at 1.out3? I can connet the fan to 1.out5 but I would like to understand the behaviour. -
M106 P1 C"Hotend" S1 H1:0 T45
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How did you have it wired to out5?
https://duet3d.dozuki.com/Wiki/Duet_3_Mainboard_6HC_Hardware_Overview#Section_Connectivity
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Honestly, I wired it to "1.out3", "1.out5 " and "1.out7"
https://duet3d.dozuki.com/Wiki/Duet_3_Expansion_3HC_Wiring_DiagramMy conclusion is now:
It works with the fan wired to "1.out7" and this config:
M950 F1 C"1.out7" Q500 M106 P1 S1 H1 T45 ;C"Hotend"(With or without the 'C"Hotend", here off for reference')
And the fan is always on when I wire it to "1.out3" and configure like that:
M950 F1 C"1.out3" Q500 ; create fan 1 on pin 1.out5 and set its frequency M106 P1 S1 H1 T45 ;C"Hotend"(With or without the 'C"Hotend", here off for reference')
I connected only "plus" and "ground" to the connectors.
And it seems that I'm not fully wrong here because it works as expected on "1.out7". :?
I'm close to giving up here. At the end will it not make a difference whether it is connected to "1.out3" or "1.out7" when the rpm signal is useless here.
(Yes, I mixed up some ports in my posting yesterday and I apologize for that.)
Cheers, Chriss
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@Chriss So it is out7 that works, not out5 as you previously stated yes? That makes a difference. There are separate voltage jumpers for out 3 to 5, and out 6 to 8. Is there a jumper fitted to the out3 to 5 select pins and if so, is it set the same as the jumper for out 6 to 8? One reason the fan might not work on out 3 to 5 is that it's a 24V fan but the jumper is set to 12V or that the jumper is missing.
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I do not think that I have a voltage problem here. The Fan is spinning all the time, the temperature control do not work on. In other words: It seams like "T45" has no effect on at "1.out3" but on "1.out7".
So it does not seams like a conif problem, more like a understanding problem. My best guess is that the rpm fan connectors can not be controlled by "T".Cheers, Chriss
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@Chriss Hmmm. I guess that's a possibility. I have to confess that all my fans are 2 wire so I found it more convenient to use the 2 wire out connectors. Hopefully a moderator or DC42 will step in and confirm what you think is true or otherwise.
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I hope for a confirmation, too. It would be good to know for education.
I will connect the fan to 1.fan7 and that's it than.
Cheers, Chriss
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Can you enlighten us here, please?
