Got decent 5015 blowers - do not spin under 100%

Gixxerfast

@maracmb said in Got decent 5015 blowers - do not spin under 100%:

@Gixxerfast tried positive from psu and gnd via duet (fan pin). no luck.
Voron with a duet runs these fans? or voron with anything else than Duet? I do think it's a duet quirk at work here...
Config is fine, but i can share and entertain, for sure. I now connected it directly to only remainig duex.fan8

Nah, these are not Duet/RRF. They are probably BTT Octopus/Klipper. But how much can differ when you pwm on the ground (V-) side? I think Klipper defaults on 500Hz. I had problems with the SanAce four wire fans where I had to add a pullup on the pwm line but that's like a different story. Then again i've had Sunon 24V fans that just refused to get PWM:ed.

Gixxerfast

@maracmb said in Got decent 5015 blowers - do not spin under 100%:

@elmoret sure... swap a 8,7 eur fan with a 14 euro fan... shiiiiiieeeeet. 14! I have a wife and kids man

Some are running Papst fans ...

zapta

@maracmb said in Got decent 5015 blowers - do not spin under 100%:

If you have a module you can suggest, do please as it would then work just as a plain buck converter with which this thing works.

The thread is at the link below. @Egon-Net made them and provided to people that asked.

https://forum.duet3d.com/topic/21680/designing-a-pwm-to-analog-mini-board-for-fans

Also, check this dc42's note in same thread: https://forum.duet3d.com/topic/21680/designing-a-pwm-to-analog-mini-board-for-fans/50?_=1640972795067

EDIT: The best solution of course is to use a 3 or 4 wires fans because they were designed to have a controlled variable speed.

PCR

@zapta I made one. See my topics. Works great

zapta

@pcr good to know. Hopefully they will be available for everybody to purchase. Will solve a lot of problems.

Just looked at fans datasheets. This is for example what CUI says:

"Do not use power or ground PWM to control the fan speed."

https://www.cuidevices.com/product/resource/cfm-80v.pdf

PCR

@zapta have a lot here. But nobody wants them ;d

MaracMB

@pcr , I need like 6-8

dc42

@maracmb said in Got decent 5015 blowers - do not spin under 100%:

M950 F8 C"duex.fan8" Q500 ; fan 8 on pin duex.fan8 EXTRA FAN

The fan outputs on the DueX run at fixed PWM, so the Q parameter has no effect on those. Fans that are fussy about PWM frequencies should be connected either to fan outputs on the Duet, or to spare heater outputs on either the Duet or DueX.

MaracMB

@dc42 yeah this is why it made zero difference whatever i did
Ok, will use duet fan pins and spare heaters for to drive this.

MaracMB

Replaying for all that might stumble upon this damned fan to run it on Duet;
It was the PWM frequency.
Mechatronics B5015E24B-BSR 24V 5015 fan needs low frequency to run/barely spin at 40% and then go up to 100%.

I didn't do huge testing and for now I use
M950 F0 C"fan0" Q65 L0.4

I've set minimum fan speed to 40% (L0.4) so it's spinning even if I mess the slicer settings and set it lower