ACTIVE HOTEND FAN in STAND BY mode

Basic Information:

Printer Model: hellbot magna 2 300
MCU / Printerboard: Mks nano robin V1.3
Host / SBC ???
klippy.log ???

A couple of days ago I bought a btt pad 7 and I’m starting with a magna 2 300 that I already had before with marlin, it’s already working and I’m doing various calibrations until I got bothered by the noise of the hotend fan that I would swear that before when I used marlin it wasn’t on until the hotend rose to temperature, I think I managed to upload the only information about the pins of said board that I could find, well, my question is… how do I tell that fan to stay still until it’s time to spin?

Please use google translate and post in English.

See Configuration reference - Klipper documentation
The setting your looking for is off_below

just translated and edited

Add a heater_temp: 50.0 entry to your [heater_fan heatbreak_cooling_fan] section.

my heater fan is directly to 24v to main board, I don´t know where exactly in main board

i don´t have this, My question is where do I find the heather fan and where do I connect it afterwards to be able to control it?

Please post your klippy.log as requested in the template

Also a photo of YOUR board connected to YOUR printer would be helpful. IF the hotend fan is not wired to unswitched power it must be wired to one of the screw terminals PB0 or PC3.
Does your part cooling work correctly after the installing klipper?

Should I copy and paste the link? Why do I click download and it doesn’t do anything?
I’ll disassemble the printer later and upload a photo of the board. Can I disconnect the screen that’s currently rebooting since I’m going to open the machine?

Are you connecting to your pad7 or working directly on the touchscreen? You need to connect to the pad7 from the PC you use to read this forum.

You can unplug the USB cable to the printer but DO NOT power off (or pull the power plug) from your pad7 except as a last resort.

The pad 7 is connected to the printer via USB and I connect from orcaslicer/device to the pad7 via WI FI
My question was if I can disconnect the 3.5 screen from the printer itself since with Klipper I use the pad7 and the 3.5 screen always remains in rebooting mode.

I just discovered that (on my PC) you cannot download a log file from inside Orca Slicer.

You need to copy the pad7’s IP address to your browser. It will look almost exactly the same but now when you click download it will actually download to your browser’s default download folder.

Well, I opened it there, the cable that I marked in violet is the fan that is at the base and always running, it is connected to pin J10, in J15 there is the green cable and in FAN PB1 there is the orange cable

These are the cables coming from the carriage where the hotend is located: Orange cable on PB1 is the fan cap (I already tested it)
Blue cable on TH1 PC1 (???)
Brown cable on HE0 PC3 (I assume it must be the hotend thermistor) Green cable on 12/24V J15 (This is the hotend fan cable. If I put it in “HE1 PB0”, will I be able to control it later in Klipper so that it is not always on?)

The blue cable should therefore be the heater cartridge cable

It appears you were wrong Your hotend fan is connected to always on power.
BTW- Brown pair is extruder heater. Blue pair is extruder thermistor. Green pair extruder fan. Orange pair part fan.

Yes. Mind the polarity. I’ll caution you to not try more than simple on/off control as stuck filament in the top of your heat break is no fun at all.

Thank you very much. I managed to get it working by connecting the green cable to PB0 and after saving this code

[heater_fan hotend_fan]
pin: PB0
heater: extruder
heater_temp: 50.0
fan_speed: 1.0

It only works when the extruder heats above 50.0, and when it cools below 50.0, it stops.

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