Un peu de fumé / A little smoke

404-print

infiniteloop

@404-print said in Un peu de fumé / A little smoke:

Pouvez-vous m’éclairer sur ce sujet merci par avance.

According to your photos, you’ve attached 4 wires to the screw terminal for the heated bed output, one of them labeled "+24" and attached to GND of the terminal. What are these lines for?

In your config.g, you have defined the „bedtemp“ thermistor with T122000 B3590 - where did you get these values from?

404-print

@infiniteloop Bonjour, en fait c’est l’alimentation du plateau chauffant que vous voyez là. à ma connaissance les plateaux ne sont pas polariser, ce qui n’impact pas le branchement du plateau et tout fonctionnait très bien jusqu’à maintenant, c’est juste hier en remettant à chauffer qu'une trace de chauffe est apparut je n’explique pas, on dirait qu’il y a une résistance au niveau de la vis.
Concernant les paramètres ce sont les paramètres par défaut défini dans le configurateur en ligne. je débute avec le duet.

Hello, in fact it is the power supply of the heating plate that you see there. to my knowledge the platters are not polarized, which does not impact the connection of the platter and everything worked very well until now, it was just yesterday when reheating that a trace of heating appeared I did not not explain, it seems that there is a resistance at the level of the screw.
Regarding the parameters, these are the default parameters defined in the online configurator. I start with the duet.

infiniteloop

@404-print said in Un peu de fumé / A little smoke:

à ma connaissance les plateaux ne sont pas polariser

à ma connaissance, si, il sont:

https://docs.duet3d.com/duet_boards/duet_2_wifi_ethernet_maestro/duet_2_we_v1.04_feature.png

Please note that theses are outputs. Make sure you don't feed any voltages(e.g. "24V"?).

I doubt the thermistor values. Can you measure the resistance of both the bed heater's thermistor and the one you've attached to e0temp (should be the print head's thermistor) at room temperature? If they are similar to each other, I suggest to replace the bed thermistor's parameters with T100000 B4138.

404-print

@infiniteloop, le problème c'est que je ne trouves pas la polarité du bed, j'ais juste "un" ou "deux" le duet est directement connecté au plateau chauffant qui lui n'est pas polarisé, du moins je pense
pour les mesures j'ai à 20k 0.24 pour E1 et 0.15 sur TB ''prise déconnecté de la carte'' et pardon j'ais oublier les bases, c'est en 24 V tout ça.

the problem is that I can't find the polarity of the bed, I just have "one" or "two" the duet is directly connected to the heating plate which is not polarized, at least I think
for the measurements I have at 20k 0.24 for E1 and 0.15 on TB ''taken disconnected from the card'' and sorry I forgot the basics, it's all 24 V.

infiniteloop

@404-print The polarity of the bed heater doesn’t matter, as long as you directly connect both poles with the heated bed output of the Duet. That results in two lines. I wonder: what are the other two lines for? On your photos, I count 4 lines arriving at the Duet’s screw terminal.

I have at 20k 0.24 for E1 and 0.15 on TB

Hm… set your multimeter at 200k and try again. Don’t measure the board, measure the lines to the thermistors. Readouts of around either 10k (rarely) or 100k are common.

404-print

@infiniteloop , enfaite le fil a été doublé, je ne c'est pas pourquoi ... Mais tout va au bed.
Nouvelle mesure en 200k :

infact the wire was doubled, I don't that's why... But everything goes to the bed.
New measurement in 200k:

ex : 0.4
tb : 0.6

infiniteloop

@404-print said in Un peu de fumé / A little smoke:

enfaite le fil a été doublé, je ne c'est pas pourquoi ... Mais tout va au bed.

OK, that’s (sort of) fine. Now, to the overheating: You say, referring to your first photo, it’s the leftmost of the three visible screw terminals on your bed which becomes hot?

In this case, either the screw has come loose, or the heater lead on the bed itself has suffered from a hot spot - well, hopefully not.

Is your bed heater specified for 24V? Then, you can just reconnect the cables and carefully tighten the screws. That should work (as long as the heater leads on the bed didn’t suffer), although you should inspect the seating of the screws on a regular schedule.

New measurement in 200k:
ex : 0.4
tb : 0.6

I’m not sure how to interpret these readings. Let’s try a different approach: what temperatures does DWC (Duet Web Control) report for the two heaters at room temperature?

Philippe71

If it worked for a while, typically, it looks like the screws on the power terminals were not tightened enough...

404-print

@Philippe71 @infiniteloop , Bonjour, après de multiples vérification effectivement il semble que c’était simplement la vis qui était desserré, j’ai Malgré tout descendu le paramètre PWM du plateau pour être sure quand même au cas où, un grand merci à tout le monde pour la réactivité de ce forum encore bravo pour le projet duet3D.

Hello, after multiple checks indeed it seems that it was simply the screw which was loosened, I nevertheless lowered the PWM parameter of the plate to be sure all the same in case, a big thank you to all the world for the responsiveness of this forum congratulations again for the duet3D project.