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4028 Fan weirdness
#fix-my-printer
Bit of strangeness around my Delta FFB0412UHN 4-pin 12V 4028 fan. Its hooked up as documented here: https://os.ratrig.com/docs/guides/4028 It mostly works. 0% fan is off, 100% is jet engine. So far so good. But there are some strange things
1) It doesn't seem to come on until the percentage is about 7%.
2) the RPM (wired to PD14 ) is wierd. at 0%, its 0 rpm. at 50% its about 12000 RPM. But then it seems to DECREASE. at 80% power, the reading shows about 900 RPM, even though the fan is spinning WAY faster.
Also really odd is that the ratrig article says that for delta fans, blue wire is PWM
But https://www.delta-fan.com/Download/Spec/FFB0412UHN-SP4Z.pdf claims that the YELLOW wire is PWM, where Blue if F00. That document also states that 25 Khz is correct, leading me to believe that a cycle_time of .00004 is indeed correct.
My fan section reads:
[fan]
pin: !fan_part_cooling_pin
cycle_time: 0.00004
tachometer_pin: ^PD14
tachometer_poll_interval: 0.0005
Any suggestions? What kinds of parameters should i be looking at?
Bit of strangeness around my Delta FFB0412UHN 4-pin 12V 4028 fan. Its hooked up as documented here: https://os.ratrig.com/docs/guides/4028 It mostly works. 0% fan is off, 100% is jet engine. So far so good. But there are some strange things
1) It doesn't seem to come on until the percentage is about 7%.
2) the RPM (wired to PD14 ) is wierd. at 0%, its 0 rpm. at 50% its about 12000 RPM. But then it seems to DECREASE. at 80% power, the reading shows about 900 RPM, even though the fan is spinning WAY faster.
Also really odd is that the ratrig article says that for delta fans, blue wire is PWM
But https://www.delta-fan.com/Download/Spec/FFB0412UHN-SP4Z.pdf claims that the YELLOW wire is PWM, where Blue if F00. That document also states that 25 Khz is correct, leading me to believe that a cycle_time of .00004 is indeed correct.
My fan section reads:
[fan]
pin: !fan_part_cooling_pin
cycle_time: 0.00004
tachometer_pin: ^PD14
tachometer_poll_interval: 0.0005
Any suggestions? What kinds of parameters should i be looking at?
4028 server fans are becoming a popular option for part cooling because of their light weight and great pressure and flow rates. In this guide we'll go over how to connect one and use it for part cooling. 4-pin fans usually aren't used in 3d printers, and many boards only provide 2-pin ports, but fear not! There's always a way.
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