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
inc-lavenderOP•2y 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
inc-lavenderOP•2y 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.
inc-lavenderOP•2y ago
Can confirm that the fan had the pin reference inverted!
correct-apricot•2y ago
You mean this:
inc-lavenderOP•2y 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
correct-apricot•2y ago
Ah, ok!I have the same problem, but this didn't solve it... I'll keep diging
inc-lavenderOP•2y ago
Try to turn it to 100%, does it stop?
correct-apricot•2y ago
Nope,
It was working some days ago, but suddenly I'cant control the speed
inc-lavenderOP•2y ago
Check continuity on the pwm wire maybe?
correct-apricot•2y 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
inc-lavenderOP•2y ago
Great! At least you have something to start from 🙂
correct-apricot•2y ago
Yess!! ...
thank you!
I hate wires... 😫
inc-lavenderOP•2y ago
Haha for my vcore build all the electronics and wiring was my favorite part
correct-apricot•2y ago
Problem solved... !! crappy wires...
Hey I am having a similar issue I think. The fan can be stopped and started but the interface shows the speed in reverse- 100 is off
Do I need to enable 4pin 25khz in the cfg?
What should the line of code look like?
inc-lavenderOP•2y ago
Did you connect it as from the manual?
yes and without tach at the moment
it operates, its just the control is inverted
inc-lavenderOP•2y ago
Hmm I didn't enable anything weird on a fresh ratos install, just copied the part cooling fan config on my printer.cfg and updated the pin logic
You sure that you didn't modify anything else?
I did not do anything in the printer cfg file for fan until just now
I am looking at the guide and possibly misunderstanding it. It says IF your BOARD has a 4 pin header- which it does NOT, then uncomment etc
I have just added the pin logic stated in the guide. I missed the part about putting it in the user overrides section. About to check it now
inc-lavenderOP•2y ago
If you used only 3 wires as in the guide you don't need the 4 pin header functionality
look at the printer.cfg part of https://os.ratrig.com/docs/guides/4028#pwm
i.e.
[fan] pin: !fan_part_cooling_pin
Ok I did that and it fixed it thanks