Overtemperautre on bed - turn off PS_on - possible yet?

Martin1454

Hello, a while back with firmware v.2 I remember it was not possible to to change what to do in case of a thermal error.

Since the firmware is now v3, have there been added any way to add M81 in case of overtemperature error?

Im running a solid state relay for my bed heater, but in case of it failing short, I would like to use an mechnical relay before it that is attatched to the PS_ON.

Br. Martin

BoA

@Martin1454
https://duet3d.dozuki.com/Wiki/Gcode#Section_M143_in_RRF_3_01RC2_and_later

Veti

i think a thermal fuse is safer.

BoA

@Veti Best to have both. And set software limits below fuse limit, so the fuse disconnects only when it is absolutely required.

Martin1454

@BoA said in Overtemperautre on bed - turn off PS_on - possible yet?:

@Martin1454
https://duet3d.dozuki.com/Wiki/Gcode#Section_M143_in_RRF_3_01RC2_and_later

So to be sure, if I use M143 with A1, it will trigger PS_ON to off if it succeds the S parameter right? or does A parameter have to be something else? I see that if I set it to A0 and then set up M570, it will wait some time and then trigger, but does it do it immediately with A1/ A2?

BoA

@Martin1454 A1/A2 - will switch off heater not printer, A3 - shut down printer.

Martin1454

@BoA Thanks!