Ok it seams like there is no firmware solution. I will use a relay instead. But there should be a simple firmware solution, because these Meanwell PSUs are quite popular.

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

@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.

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.

Ok it seams like there is no firmware solution. I will use a relay instead. But there should be a simple firmware solution, because these Meanwell PSUs are quite popular.

I got a replacement two days ago. With the new board everything works like i expected.

One more question. My 24V PSU can be turned on and off by a external signal. I wired it up and it works, but unfortunately the PSU is not a ATX one and turns off if it gets the 5V signal from the Duet. Is there a setting in the firmware where i can invert the ATX_ON pin?

Any further ideas?

@dc42

Nr.1 and when i apply 5V and VIN simultaneously.

@T3P3Tony said in Short-to-ground reported by driver(s) 0 1 2 3 4:

orking fine using the internal 5V regulator then we need to work out why the external 5V supply is causing the issue. Please can you measure the voltage level between 5V and Ground on (e.g.) the PanelDue header using a multimeter to confirm that when the external 5V PSU is attached the Duet has 5V on its 5V rail (not just on the power supply input).

PSU: 5,00V
pin1/2: 4,65V

I increased the voltage to (5,44V/5,05V) but the error message still occours.

* push *

When i switch from the 24V to the 5V supply quickly (just change the jumper position while it is running) i don t get any error message.

Edit:

If i turn on the 24V PSU first and after some seconds the 5V PSU everything will work fine.