Tool fan temp control again
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Hi *,
I have again a problem with my fan which should cool the hotend. This time with the 3HC. (I build a new printer)
The fan (F1) spins all the time but I want to have it started at 45°C. That is the case when the fan is connected to "1.out3" including the tacho signal. So I connected it to "1.out5" (without the tacho) and it was working there.
What do I do wrong here?The current config:
;; Heaters ; Bed ##################### TODO M308 S0 P"temp0" Y"thermistor" T100000 B4138 ; configure sensor 0 as thermistor on pin temp0 M950 H0 C"out0" T0 ; create bed heater output on 1.out0 and map it to sensor 0 M307 H0 B0 S1.00 ; disable bang-bang mode for the bed heater and set PWM limit M140 H0 ; map heated bed to heater 0 M143 H0 S120 ; set temperature limit for heater 0 to 120C ; Hotend M308 S1 P"1.temp0" Y"thermistor" T500000 B4723 C1.196220e-7 ; configure sensor 1 M950 H1 C"1.out0" T1 ; create nozzle heater output on 1.out0 and map it to sensor 1 M307 H1 B0 S1.00 ; disable bang-bang mode for heater and set PWM limit ;; Fans ##################### TODO ; Fan for the printed part: M950 F0 C"1.out6" Q500 ; create fan 0 on pin 1.out4 and set its frequency M106 P0 S0 H-1 ; set fan 0 value. Thermostatic control is turned off ; Fan for the Hotend: ;M950 F1 C"1.out5" Q500 ; create fan 1 on pin 1.out5 and set its frequency M950 F1 C"1.out3" Q500 ; create fan 1 on pin 1.out5 and set its frequency M106 P1 S1 H1 T45 ; C"Hotend" ; P="set fan 1" S="value" H="Thermostatic control Heater No." T=" is turned on at 45°C" ; Tools ##################### TODO M563 P0 S"TooL0" D0 H1 ; define tool 0 G10 P0 X0 Y0 Z0 ; set tool 0 axis offsetsCheers, Chriss
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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?
