Fixed temperature to below 280

[X4TEC]

I've installed the latest firmware on my duet WiFi with pt100 sensor board. I've checked config file, but if i try to set temp to anything beyond 280 printer just ignores the temp. I even tried gcode directly. Is it possible I have a hardware issue. I've got other issues with extrusion which I can't resolve. I did drop a screwdriver on the board. I advanced digs I can run?

[wilriker]

@x4tec Do you have a M143 command anywhere? Most probably in your config.g. It is used to set maximum allowable temperatures. If so is this set to 280°C for the hotend?

[Dougal1957]

the firmware by default is limited to 260 (Or poss 262) so to be able to get to 280 you need to alter that limit with the M143 command as Wilriker rightly says

HTH

Doug

[wilriker]

@dougal1957 said in Fixed temperature to below 280:

the firmware by default is limited to 260 (Or poss 262)

262°C it is (though I find it a strange constant).

[Dougal1957]

@wilriker I Suspect it is to allow a small amount of overshoot if someone pid tunes at 260! but not certain

[wilriker]

@dougal1957 I just checked source code because I was curious if there is a comment that points to this rather strange number. It turned out there is but it's surprising:

constexpr float DefaultExtruderTemperatureLimit = 290.0; // Celsius - E3D say to tighten the hot end at 285C

So, actually it is 290°C if no M143 is given (which I think is autogenerated by the configuration tool and set to 280°C).

@dc42 is this an error in the documentation of M143 or did I miss anything? In Heat.cpp it definitely uses this constant in init().

[dc42]

Thanks, I have updated the documentation.

[X4TEC]

Ill double check but I'm sure I adjusted M143 to 285 and it made no difference.

[X4TEC]

Thanks all, must have been, that I set to low. Works fine since I set to 290.