Hotend heatsink cooling fan wont run at full speed
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Hot end heat sink fan wont spool up to full speed on thermostatic control until i send a manual M106 S255 P0. Any ideas?
; Heaters
M308 S0 P"bedtemp" Y"thermistor" T100000 B4138 ; configure sensor 0 as thermistor on pin bedtemp
M950 H0 C"bedheat" T0 ; create bed heater output on bedheat and map it to sensor 0
M307 H0 B1 S1.00 ; enable bang-bang mode for the bed heater and set PWM limit
M140 H0 ; map heated bed to heater 0
M143 H0 S115 ; set temperature limit for heater 0 to 115C
M308 S1 P"spi.cs1" Y"rtd-max31865" ; configure sensor 1 as thermocouple via CS pin spi.cs1
M950 H1 C"e0heat" T1 ; create nozzle heater output on e0heat and map it to sensor 1
M307 H1 B0 S1.00 ; disable bang-bang mode for heater and set PWM limit
M308 S2 P"e1temp" Y"thermistor" T100000 B4138 ; configure sensor 2 as thermistor on pin e1temp
M950 H2 C"e1heat" T2 ; create chamber heater output on e1heat and map it to sensor 2
M307 H2 B1 S1.00 ; enable bang-bang mode for the chamber heater and set PWM limit
M141 H2 ; map chamber to heater 2
M143 H2 S75 ; set temperature limit for Chamber to 75C; Fans
M950 F0 C"fan0" Q500 ; create fan 0 on pin fan0 and set its frequency
M106 P0 S1 H1 T45 ; set fan 0 value. Thermostatic control is turned on
M950 F1 C"fan1" Q500 ; create fan 1 on pin fan1 and set its frequency
M106 P1 S0 H-1 ; set fan 1 value. Thermostatic control is turned off
M950 F2 C"fan2" Q500 ; create fan 2 on pin fan2 and set its frequency
M106 P2 S0 H-1 ; set fan 2 value. Thermostatic control is turned off -
How do you have your tools defined?
What happens if you change M106 P0 S1 H1 T45 to M106 P0 S255 H1 T45 ?
What firmware version? Should be 3.1.1
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yea im on 3.11. ok ill try it thanks. Dont know how i missed that lol.
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funny it still seems slow down but at the end of the print, full speed during the print. Is that normal?
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Do you have any other M106 commands elsewhere?
There should be no difference between S1 and S255. They both say the same thing. S0 to S1 can be used as a decimal representation of a percentage. S0.5 would be 50%. Or you can use S0 to S255 to set it as an 8bit value (at least I think that's the origin of that).
your command is otherwise correct. H1 attaches it to heater 1 and T45 sets the temp to 45c. So when heater 1 reaches 45c it should turn on fan 0 to full power.
Perhaps the fan is failing? Or perhaps it doesn't like the PWM frequency.
Try changing the M950 Q parameter to change the frequency. 500hz is the default, but you can try as low as 10 or up to 30000.
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I suggest you swap fans numbers 0 and 1 over so that Fan 0 is the print cooling fan and Fan 1 is the thermostatic heatsink fan. This is what we recommend, see https://duet3d.dozuki.com/Wiki/Connecting_and_configuring_fans.
The reason is that fan 0 is the one that slicers use by default. What I think is happening is that the slicer has put a M106 S0 or M107 command in the GCode file before a tool is selected, which tells RRF to turn off the thermostatic fan. But RRF allows a minimum 50% speed for thermostatic fans when they are supposed to be on.
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Ok ill try it out tonight, Thanks.
