Electronics cooling fan on RRF3
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@Phaedrux said in Electronics cooling fan on RRF3:
Well it's probably reached the temp you've set, so it's turning off.
Try a lower temp than 32.
It's also possible that the blip is running but then it's not capable of spinning at the lower requested speed range.
So try a temp range of 20:40
M106 P2 H2:3 L20 X70 T20:40
You may also need to experiment with the M950 Q value for the parallelized fans. It's possible it can't spin up all 3 at that freq? Try 1000.
It's the fan wich works only 0 or 100%...now I have to try to find a model who works even in PWM but I really don't know what could be the model....if I search for PWM fans I find only the ones with 4 pins
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Well true PWM fans are 4 wire. The switching that the Duet does probably shouldn't work at all with any fans, but it actually ends up working quite well most of the time.
Is this for the 3 fans in parallel or is this for a different single fan?
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@Phaedrux said in Electronics cooling fan on RRF3:
Well true PWM fans are 4 wire. The switching that the Duet does probably shouldn't work at all with any fans, but it actually ends up working quite well most of the time.
Is this for the 3 fans in parallel or is this for a different single fan?
even a single one
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Sunon fans seem to work well from my experience with them. If you want a specific fan recommendation you'd have to provide some info on the implementation.
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@Phaedrux said in Electronics cooling fan on RRF3:
Sunon fans seem to work well from my experience with them. If you want a specific fan recommendation you'd have to provide some info on the implementation.
ok, I'll try to find a Sunon, thanks...about the implementation for me it's enough 120mm 12VDC...
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@the_dragonlord In that case a Noctua 120mm fan isn't a bad choice. Even the 4 wire PWM fans can be driven by a simple 2 wire connection and will likely have good characteristics for low speed operation since that's what they are designed for.
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@Phaedrux said in Electronics cooling fan on RRF3:
@the_dragonlord In that case a Noctua 120mm fan isn't a bad choice. Even the 4 wire PWM fans can be driven by a simple 2 wire connection and will likely have good characteristics for low speed operation since that's what they are designed for.
Are you sure? I know that a 4 pin driven with only pins (power) does'nt work..
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Noctua even includes an adapter that takes a 4 wire down to 3 wire and then another that takes it down to 2.
The 4 wire fan still needs power and ground. The other 2 pins are PWM signal and RPM feedback.
In the absence of PWM and RPM it's still just a DC fan.
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@Phaedrux said in Electronics cooling fan on RRF3:
Noctua even includes an adapter that takes a 4 wire down to 3 wire and then another that takes it down to 2.
The 4 wire fan still needs power and ground. The other 2 pins are PWM signal and RPM feedback.
In the absence of PWM and RPM it's still just a DC fan.
And they could be driven in PWM even with two pins?
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You must understand that the PWM used by the duet isn't the same as the 4 wire PWM fan would use normally. The duet is just switching the negative side at a frequency to approximate PWM. (Though you can actually wire up a 4 wire PWM capable fan and use it as intended as well). This method is rather effective most of the time but not all fans work well with it. I'm suggesting that the 4 wire fans probably would take to it just fine.
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@Phaedrux said in Electronics cooling fan on RRF3:
You must understand that the PWM used by the duet isn't the same as the 4 wire PWM fan would use normally. The duet is just switching the negative side at a frequency to approximate PWM. (Though you can actually wire up a 4 wire PWM capable fan and use it as intended as well). This method is rather effective most of the time but not all fans work well with it. I'm suggesting that the 4 wire fans probably would take to it just fine.
ok, thanks
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@the_dragonlord said in Electronics cooling fan on RRF3:
Are you sure? I know that a 4 pin driven with only pins (power) does'nt work.
It should. I've never seen either a data sheet or an actual fan that doesn't. If you connect just the power and ground of a 'normal' four wire fan, it should run at full speed - the fan includes an internal pull-up on the PWM , so if that wire is left floating it goes high and fan runs at full speed.
The reason that four-wire fan connectors have the polarisation lugs in a funny place is so that they work three-pin connectors, leaving the PWM line unconnected.
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@Phaedrux said in Electronics cooling fan on RRF3:
You must understand that the PWM used by the duet isn't the same as the 4 wire PWM fan would use normally. The duet is just switching the negative side at a frequency to approximate PWM. (Though you can actually wire up a 4 wire PWM capable fan and use it as intended as well). This method is rather effective most of the time but not all fans work well with it. I'm suggesting that the 4 wire fans probably would take to it just fine.
I've changed the fans and now it works like a charm!
Thanks!