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Pla cooling fan pwm noise

Posted by Bking1340 
Pla cooling fan pwm noise
May 01, 2015 07:55AM
Good day all
My 40mm pla cooling fan are connected to D9 on my ramps 1.4. Sometimes during a print while my fan change rpm, I get this pwm noise. Do anybody know what can be changed in Marlin and to what to make the stupid noise go away. I have an idea that it`s someting to do with: #define SOFT_PWM_SCALE 0 or #define FAST_PWM_FAN or #define FAN_SOFT_PWM, but am not sure. While the fan are full blast the sound goes away, but anything under around 200pwm, the sound comes back.
Re: Pla cooling fan pwm noise
October 07, 2015 01:01PM

Did you manage to work it out? I get the same behaviour with Yate Loon's D40SM-12C, they start to whine below 220 PWM
Re: Pla cooling fan pwm noise
October 08, 2015 04:16AM
Unless you don't have the actual firmware, tailored for your printer at hand, it's a lot of work to adapt a "common" version of marlin to your printer, before you can play around with fan_PWM settings.
My best educated guess is : define fast_PWM_fan will cure the noise problem.
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