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Lzhikai / SIBOOR-Voron-2.4-AUG

Octopus Pro+BTT pi + CAN RP2040
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part cooling fan PWM issue #5

Open daduke opened 5 months ago

daduke commented 5 months ago

Hi,

the Sunon EF50152B1-1C01C-A99 isn't a very good choice as a part cooling fan in this configuration due to its BLDC and autostart function (the A in the part number). With the given configuration, the fan is basically off (< 99% fan setting) or running full blast (>= 99%). This doesn't really make tuning part cooling possible. The best workaround I found is to drive the fan at a very high (hardware) PWM frequency:

[fan] pin: EBBCan:gpio13 kick_start_time: 0.1 cycle_time: 0.000025 # 40 kHz off_below: 0.07 hardware_pwm: true

but even then, the lowest possible fan speed (7%) is quite high.

best, -Christian

Pneumanifest commented 5 months ago

Can confirm. The part cooling fan will not allow for much tuning if at all.

daduke commented 5 months ago

I replaced it with a GDStime 24VDual Ball 8500RPM which gives me full 4%-100% power range.