I do it in the mean time like your schematic. Next weekend I will do another try with the new SSR.
The option to connect the fans to 5V is also interesting. How do you connect the fans to the Duet and the 5V power supply?
I do it in the mean time like your schematic. Next weekend I will do another try with the new SSR.
The option to connect the fans to 5V is also interesting. How do you connect the fans to the Duet and the 5V power supply?
Tomorrow I will get a new SSR and then test it again.
The Duet is reporting the bed temperature, if it is really correct I can check tomorrow.
I check today evening, if the LED light up. Is it possible the the LED on the SSR is on and the
LED on the Duet is off?
What does the LED indicate?
I found out that when I connect the 12 V directly from the power supply to the control side of the SSR, the bed heating up and I can masure 1V between the plus and minus of the SSR(24V) main side.
If I connect the SSR to the duet bed connector and switch on the bed I mesure 24V between the plus and minus of the SSR(24V) main side.
Make this sence?
Thanky you for your help. I will double check all again. Maybe I make a mistake.
Yes, that is exactly my problem. The LED goes on and out, but in both status the bed plate didn't get warm.
"Let me give this one more shot. You have a 12V power supply and a 24V power supply.
The 24V power supply is connected to the heat bed via the output side of the SSR.
The input side of the SSR is controlled by the Duet (and consequently the 12V supply)."
That is exactly what I do.
"If you hook up 12V positive to the SSR control input plus and you hook up ground from the 12V power supply to the ground of the SSR control input ground then you say the bed heater heats up ?"
If I disconnect the heatbed output from the duet and connect the 12V(+) from the power supply directly to the 12V positiv control input and also the ground from the 12V power supply to the ground of the SSR control input, the bed is heating.
The LED on the SSR is i both configurations on, but the bed is not heating when connect to the duet.
"Now you disconnect the 12V power supply and connect the Duet heater output to the SSR and you are now not seeing any heat in the heated bed ? Is the LED on the SSR on ?"
The LED on the SSR is on but any heat in the heat bed.
"Keep in mind that the Duet switches the ground side of the heat bed output and not the 12V end."
Why is that importent?
I can confirm that your understandig is correct.
The ground was not the problem. It also dosn't work after I connected both grounds together.
Can it be that I have to change something in the firmeware?