#PWM fan not shutting off at 0% on BTT M8p board

11 messages · Page 1 of 1 (latest)

void otter
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Installed the BTT Manta M8p 1.1 board today, run through the config and its all set up. Trying to run an Arctic Cooling 4028 fan. Its PWM and connected to the correct socket on the board. I can control it fine so its all connected to the right pins and linked the 25khz part cooling fan cfg, but at 0% it still spins at 1100rpm which is the min value in the datasheet. But i want it to turn OFF at 0%.
I saw a section for the issue on the "connecting a 4028 fan" page of the RATOS setup guide but it says about using the enable_pin option in klipper. But when i go to use the pin (PB8) it gives the error: pin PB8 is an alias for 4p_fan_part_cooling_pin.

What do i need to add or edit to get it to turn the fan off when set to 0%?

printer.cfg attached. Thank you

📎 printer.cfg
lament fossil
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that config doesn't have enable_pin, upload the one you are having issues with

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also did you wire the fan to have the ground pin connected to one of the heater ports negative terminal?

void otter
lament fossil
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yes, you need an addressable ground pin, the one in the 4 pin socket isn't addressable

void otter
lament fossil
void otter
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Weird that btt did it that way but maybe this is an edge case they didn't consider. Anyway thank you, wired the gnd up to the unused heater pin and functions perfectly now. Thanks

obtuse gulch
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A sanyo denki on those 4-pin ports will stop spinning at 0% (depending on model it stops below 10 or 30%).