Thermostatic controlled fans not working
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My fan 6 and 7 run at 100% with this command for instance:
M106 P6 S0 H0 T50
or
M106 P6 S0 H1 T50
when those sensors report to be at room temp (25C)However, when I change to any other temperature sensors (other than 0 or 1), it works properly. I can't find any issues with my config file, can you?
config.g driveSetup.g variables.gRunning 3.5.4 on 6XD with multiple 3HCs and 1XD in SBC mode with RPi 5
Thanks
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Can you send M98 P"config.g" and M122 in the gcode console and share the results?
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Unfortunately that doesn't tell me much.
Can you try setting a range for T in your commands? T25:50 for instance.
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This is just a guess but sensor 0 is assigned to the bed heater and sensor 1 is assigned to the chamber heater.
Correct?
Perhaps being assigned to those non-extruder heaters, thermostatic control does not work as it does for extruder heaters?
Frederick
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@Phaedrux I tried that as well but I have the same issue of the fans running all the time.
@fcwilt said in Thermostatic controlled fans not working:
This is just a guess but sensor 0 is assigned to the bed heater and sensor 1 is assigned to the chamber heater.
Correct?
Perhaps being assigned to those non-extruder heaters, thermostatic control does not work as it does for extruder heaters?
Frederick
That is a good point, I tested assigning that fan to every sensor on my printer and the thermostatic control worked on each sensor, except the bed and chamber sensors. I wonder why that is?
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Well the extruder fans are there to keep the cold end of the extruder "cold".
You wouldn't want a fan to "cool" the bed or chamber, so perhaps thermostatic control is simply disabled for bed and chamber heaters.
The code for the firmware is available if you want to look at it.
Frederick
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@fcwilt said in Thermostatic controlled fans not working:
so perhaps thermostatic control is simply disabled for bed and chamber heaters.
I don't think so. For instance, it's common to use the bed heater as a proxy to control a case cooling fan, with the assumption being that if the bed heater is on, you're probably running a print and want the Duet to be actively cooled.
@p8blr Are the fans on a different can board than those heaters? I think this may be the reason.
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@Phaedrux said in Thermostatic controlled fans not working:
I don't think so. For instance, it's common to use the bed heater as a proxy to control a case cooling fan, with the assumption being that if the bed heater is on, you're probably running a print and want the Duet to be actively cooled.
You mean cool the Duet electronics?
I've just monitored the MCU temperature to decide when to run fans to cool the electronics.
Frederick
