@Phaedrux and @o_lampe

Thank you for your answers.

It is direct air heating.

I updated the firmware to 3.2. It was like you said, I had to upload a new config after the update, but no problem.

The PID Tunning is now much more patient, but unfortunately it was still not enough.
I then heated up the 2kw air heater together with the heating bed 750W that then worked.

And your idea of ​​updating also solved another problem:
https://forum.duet3d.com/topic/20444/pwm-fan-noctua-nf-a14-duet2/5

The M950 command was only inserted with firmware 3 and thus led to malfunctions in the fans.

Big thank you

Phaedrux unintentionally solved the problem by recommending an update to 3.2.

The problem was that I had installed an old firmware version 2.03. But I worked with the M950 command in my config.g file.
The M950 was only added with firmware 3. This led to the malfunctioning of the fan.

@Phaedrux and @o_lampe

Thank you for your answers.

It is direct air heating.

I updated the firmware to 3.2. It was like you said, I had to upload a new config after the update, but no problem.

The PID Tunning is now much more patient, but unfortunately it was still not enough.
I then heated up the 2kw air heater together with the heating bed 750W that then worked.

And your idea of ​​updating also solved another problem:
https://forum.duet3d.com/topic/20444/pwm-fan-noctua-nf-a14-duet2/5

The M950 command was only inserted with firmware 3 and thus led to malfunctions in the fans.

Big thank you

Hey guys,

I have a problem heating up with my heated chamber. My chamber is 600mm x 600mm x 800mm and is heated by a 2kW heater. The heater has its own temp sensors that protect it from overheating. The heater sits on the bottom of the chamber and the temp-sensor that I have installed to transmit the chamber temperature to the Duet2 is about 500mm away from the heater at the height of the print head.

If I start the heating now, the message comes:
"Error: Heating fault on heater 3, temperature rising much more slowly than the expected 1.8 ° C / sec"

I then started PID tuning. Then the message came after 1min:
"Auto tune canceled because temperature is not increasing"

The heating takes 3 minutes so that the remote chamber sensor detects a rising temperature.

I then tried to enter the PWM manual. If I understand correctly, the P value is the value that indicates how quickly something heats up. The lower the R value, the faster the element gets up to temperature.
To try this out I took the values from my heating bed and set the P value to 400 and added it to the config.g:

M301 H3 P400 I5.416 D128.0

Now the software should know that the heating element takes a long time, at least that's what I thought.

But no, the same avoidance still occurs when heating up:
"Error: Heating fault on heater 3, temperature rising much more slowly than the expected 1.8 ° C / sec"

I had at least hoped that the C/sec went down.

Do any of you have any idea what I'm doing wrong?

Board: Duet Ethernet 1.02 or later + DueX5 (duetethernet102)
Firmware: RepRapFirmware for Duet 2 WiFi/Ethernet 2.03 (2019-06-13b2)

@lord-binky

Thanks for your answer. I have now connected the fans directly to the control board. Unfortunately, that has not changed.
I measured the PWM signal to the GND of the fan. At 0V to 4V the fan is off. From 4.1V the fan goes to 3000RPM. Nothing changes between 4.1V and 4.9V.

The Tacho wire (green cable) is not connected, because I don't want to read out the rpm.

Hey guys,

I have a problem with a PWM fan on my new printer. I would like to control a Noctua NF-A14 iPPC-3000 PWM (24V) via a PWM signal. I have already connected the fan and it only runs between 80% and 100% at maximum speed, between 0% and 79% the fan turns off and I don't understand why. I've also tried the same thing with another NF-A14, it does exactly the same thing.

This is how the fan is connected:

The power supply for the fan is connected directly to the printer's 24V power supply unit. I have the PWM signal (blue cable) on the Duet2 connected in the socket FAN1 on PIN FAN1-.

The fan is configured as follows:

M950 F1 C "fan1" Q25000
M106 P1 I1 C "FAN-Radiator1" S0.7 H-1

A Noctua NF-P12 1700 PWM (12V) is already running on FAN0. I connected and configured this in exactly the same way, just connected it to the 12V power supply and there I can precisely control the speed.

Board: Duet Ethernet 1.02 or later + DueX5 (duetethernet102)
Firmware: RepRapFirmware for Duet 2 WiFi/Ethernet 2.03 (2019-06-13b2)

Do you have any idea what the problem is?

thanks