Cofigure heater1 as fan output...

Luk14

Hi,

i want to use the heater1 output on my Duet Wifi as a fan output for my watercooling system. Unforunatly i am not able to measure any voltage on the connectors.

My config:

; Heaters
M308 S0 P"bedtemp" Y"thermistor" T100000 B3950     ; 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 R0.362 C386.0 D3.93 S1.00 V24.0            ; disable bang-bang mode for the bed heater and set PWM limit
M140 H0                                            ; map heated bed to heater 0
M143 H0 S160                                       ; set temperature limit for heater 0 to 160C
M308 S1 P"e0temp" Y"thermistor" T4606017 B5848 C5.548428e-8 R4700 H0 L0      ; configure sensor 1 as thermistor on pin e0temp
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
M143 H1 S400                                       ; set temperature limit for heater 1 to 400C
M950 H2 C"nil"                                     ; disable heater 2 and free up the associated pin

; Fans
M950 F0 C"fan1" Q500                               ; create fan 0 on pin e1heat and set its frequency
M106 P0 S0 H-1 C"Bauteilkühlung"                   ; set fan 0 value. Thermostatic control is turned off
M950 F1 C"e1heat" Q500                             ; create fan 1 on pin fan1 and set its frequency
M106 P1 S255 H0 T45                                ; set fan 1 value. Thermostatic control is turned on
M950 F2 C"fan2" Q500                               ; create LED on pin fan1 and set its frequency
M106 P2 S0 H-1 C"LED"                              ; set LED value. Thermostatic control is turned off

For testing the fan is linked to the bed. The printer isn t finish yet...

I hope you can find my mistake.

Phaedrux

Can you confirm your firmware version? M115 to check.

Can you send M98 P"config.g" to check for any config errors?

Can you try M106 P1 H-1 S1 to check if it will turn on manually?

Luk14

@phaedrux My firmware version is 3.2.2 . M98 do not report any errors.

When turn on the fan manually i can measure a different voltage:
off:0,32V
on:0,55V

So at least something is happen, but I would expect 24V.

When i remap the fan to the fan0 output i get 24V there.

droftarts

@luk14 the pins reference here https://duet3d.dozuki.com/Wiki/RepRapFirmware_3_overview#Section_Pin_names_for_Duet_2_WiFi_Ethernet says

Some pins (primarily heater pins) have an inversion between the processor and the corresponding output, RRF3 will automatically allow for this inversion. These pins are marked with a * after the pin name in the list below.
...
Duet 2 and DueX heater outputs

bedheat *
e0heat *
e1heat *

My guess is that you need to invert the pin, ie try M950 F1 C"!e1heat" Q500.

If the above doesn’t work, can you test e1heat configured as a heater?

Remember that all PWM pin pairs are switched by the MOSFET on the negative side, so the load (eg fan or heater) is before the MOSFET; the positive pin will always be VIN voltage, in the case of a heater.

Ian

Luk14

@droftarts Thank you! Now everything works fine...