Duet 3 Heated Bed config

roth

Hello
i have the Heated Bed on OUT0. The printer is a Tevo little monster.
Her use a solid state relais.

But it comes Error: Heater 0 fault: temperature rising much more slowly than the expected 1.8°C/sec.
The Ralis doesn't turn on either. I have also tried inverting.
Board is a Duet 3
Temperature from the sensor is displayed and appears to be working.

Phaedrux

If the relay isn't turning on it obviously won't heat. How exactly do you have it wired? Photo?

Phaedrux

Also, are you providing power to Out0 input?

roth

Left V_OUTO +
OUTO- Ground

roth

roth

Is that ok that the Red: Diagnosis LED blinks ?

Ok i see its ok :
https://forum.duet3d.com/topic/17287/duet-3-diagnosis-led-will-not-stop-blinking/4

Phaedrux

@roth said in Duet 3 Heated Bed config:

Left V_OUTO +
OUTO- Ground

Note where is says out0 power in? You need to provide power there either from the PSU directly or jumped over from vin.

Alternatively since you are using an external relay you may be able to use a low current output instead of the high current out0.

The diagnosis light is fine.

roth

So that's why it doesn't work. You didn't have to do that with Duet wifi.
thank you !

Then I'll just mount a cable bridge.

roth

Ok
Ok after I added the cable the heating bed heats up a little but only a few seconds.
Then again :
Error: Heater 0 fault: temperature rising much more slowly than the expected 1.7°C/sec

It cannot heat up quickly at 1.7 ° C / sec

Where can you judge that?

Phaedrux

In RRF3 there is no longer a default heater model assumption used for the bed. Therefore, you must perform a PID auto tuning to give the firmware a model for bed heater performance. Failure to do so will result in an error message that the heater temperature is not rising fast enough and therefore triggering thermal protection. Running the PID auto tune for the bed and saving the results should resolve the error.

https://duet3d.dozuki.com/Wiki/Tuning_the_heater_temperature_control?revisionid=HEAD#Section_Setting_the_model_parameters_by_auto_tuning

roth

Ok
Then I'll read that.
There is a lot to read.

roth

I once tested the hotend. it works that way too.
Should you also do auto tune there?

Phaedrux

Yes pid auto tune is recommended for all heaters

roth

@Phaedrux said in Duet 3 Heated Bed config:

RRF3

I have to say I think RRF3 and the new Duet 3 are very good.
The connections are better. Clamp larger ones ..
12 V at 24 power supply now possible ...
And PID auto tune.
I can connect different sensors or panel due to IO_3 - IO_7 ..
Everything has become more flexible.

A very nice advance to Duet Wifi with RRF2