Part cooling fan always on
I got to powering up my ratrig and I noticed my 4028 Nidec fan spins up immediately and doesn't turn off. I followed the build guide and connected the pos/neg wires to the always on fan port of my motherboard (octopus 1.1), and the pwm (blue) wire to the bottom fan port as instructed. I also have a fourth wire coming out of the fan (yellow iirc) but didn't use it as nothing is mentionedcabout it. What could be my issue?
25 Replies
conscious-sapphire•14mo ago
I saw this post (https://discord.com/channels/582187371529764864/1135616636842414101) mentioning a possible inverted logic for the fan, will test if this is the issue as soon as I can get my hands on the printer, but it seems weird to me that it's the case
You need to set the pwm pin for the fan in your config file
conscious-sapphire•14mo ago
The pin is already properly set
You also need to enable 4 pin fan control
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.
conscious-sapphire•14mo ago
Can confirm that the fan had the pin reference inverted!
other-emerald•14mo ago
You mean this:
conscious-sapphire•14mo ago
The wiring is correct, but the klipper configuration files had (or didn't have don't remember) a ! before the part_cooling_fan_pin
So I had to override the pin definition inverting it
other-emerald•14mo ago
Ah, ok!I have the same problem, but this didn't solve it... I'll keep diging
conscious-sapphire•14mo ago
Try to turn it to 100%, does it stop?
other-emerald•14mo ago
Nope,
It was working some days ago, but suddenly I'cant control the speed
conscious-sapphire•14mo ago
Check continuity on the pwm wire maybe?
other-emerald•14mo ago
Do you mean that the cable may be broken?
Ok, I just move the gantry and the fan has stoped... it does seem that there are wire problems
conscious-sapphire•14mo ago
Great! At least you have something to start from 🙂
other-emerald•14mo ago
Yess!! ...
thank you!
I hate wires... 😫