12v fan on stepdown buck! config help?
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i connected a buck to center fan pin vin to run 12v fans
what should my config file look like for m106 command to controll speed since itsn not pwm would it still be S>255 -
What fan port are you connecting the fan to?
@bks31 said in 12v fan on stepdown buck! config help?:
what should my config file look like for m106 command to controll speed since itsn not pwm would it still be S>255
I don't understand your question. The S parameter controls the PWM duty cycle. Even for fans that aren't specifically PWM capable. You can use S0 to S1 and any decimal value in between or you can use S0 to S255.
https://duet3d.dozuki.com/Wiki/Gcode?revisionid=HEAD#Section_M106_Fan_On
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ok i see so even on 12 or 24 v for half speed would be s127 or s.05 right both would work?
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@Phaedrux i connected the step down to center pin on the fan jumper and that fan to fan0
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@bks31 said in 12v fan on stepdown buck! config help?:
ok i see so even on 12 or 24 v for half speed would be s127 or s.05 right both would work?
Yes that's right. PWM doesn't change the voltage provided, it just changes the time that voltage is applied.
@bks31 said in 12v fan on stepdown buck! config help?:
@Phaedrux i connected the step down to center pin on the fan jumper and that fan to fan0
That sounds correct.
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@bks31 said in 12v fan on stepdown buck! config help?:
ok i see so even on 12 or 24 v for half speed would be s127 or s.05 right both would work?
it depends on the fan. some fans dont like pwm signals and either dont change speed or refuse to run.
