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Rat Rig Community [Unofficial]•2mo ago

Jack is NOT tech Support

fans staying constantly on

hey guys, just finished some wiring on my new 3.1, and i for some reason both the hotend cooling fan and the 4028 fan seem to stay on all the time, jumpers are set and everything plugged in including the tach pin for the 4028, its a octopus, does anyon have any ideas?

5 Replies

TheTik•2mo ago

https://os.ratrig.com/docs/guides/4028/

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.

Jack is NOT tech Support•2mo ago

Thanks, I’ll dive into this. But it’s not just the 4028 it’s also the 4010

OldKingHamlet•2mo ago

Are they both pwm? You may need to invert the control signal.

Jack is NOT tech Support•2mo ago

nope 4010 is a regular 2 pin

OldKingHamlet•2mo ago

Ah. Well, my hotend fan is 2pin and it's always at 100%, which I'm fine with. My 4028, for part cooling, is connected via 3 pin PWM and needed to get the ! put in the printer.cfg as linked above.

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