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Rat Rig Community [Unofficial]•3y ago•

72 replies

thenaimis

Part cooling fan help needed

My kit came with the protechnic 4028 fan and I have been unable to get the fan to not run at full blast. I can't find any documentation on how to install this fan. Based on what I have found, I have the 12V power coming from the FAN7 connector on the Octopus v1.1, and the PWM signal connected to what I believe is the pin tied to PA6 in the connector for FAN0. The tach is not connected. I've looked through https://os.ratrig.com/docs/guides/4028/ and have tried the various combinations in there. I also tried uncommenting the 4-pin 25kHz fan config that's in printer.cfg, which didn't work because the board doesn't have any aliases for "4p_fan_blahblahblah" in it.
I've tried using the pin definition both with and without the !, I've tried using the enable_pin setting, etc. Nothing has allowed the fan to be turned off (other than unplugging it of course).

Can anyone supply a link to documentation on how to set up this specific fan with an octopus board? Preferably including tach support, with wiring info.

Connecting a 4028 fan | RatOS

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.