Maxing out at 305c - ideas thoughts?

fcwilt

Hi,

Did you try tuning at a reachable temp?

Frederick

supset

This post is deleted!

supset

@fcwilt

supset

@fcwilt I can reach 305c so 350c seems reasonable since the thermistor can reach 450c accurately

fcwilt

@supset said in Maxing out at 305c - ideas thoughts?:

@fcwilt I can reach 305c so 350c seems reasonable since the thermistor can reach 450c accurately

I tune my normal heaters at 190 even though they can reach higher.

So it may be that if you tune at 300 it will work fine at 450.

Frederick

supset

@fcwilt really, I’ll give it a try,...

fcwilt

@supset

Do you have a M143 for that heater?

Frederick

supset

@fcwilt ya,...

supset

@fcwilt it seems like that’s just a runaway setting, not an active or target setting

fcwilt

@supset said in Maxing out at 305c - ideas thoughts?:

@fcwilt it seems like that’s just a runaway setting, not an active or target setting

True but perhaps it could interfere with tuning?

Frederick

supset

@fcwilt you’re suggesting, commenting it out, perhaps yes

supset

@fcwilt it seems the M143 Command possibly works, I commented it out, and got this, default 285c limit

I put it back and restarted, and the error disappeared

fcwilt

Hi,

OK so the M143 setting does play a role in the tuning process and your previous value of 445 should not have interfered at all when using the 350 target temp.

Did you get a chance to try 300 when tuning?

I am thinking perhaps that the firmware isn't expecting such high temps like 350 and has tuning issues.

And if you could get it tuned for a lower temp like 300, 310, 320, etc then the heater might work fine for higher temps when it was simply heating.

Frederick

Phaedrux

https://forum.duet3d.com/topic/17972/config-json-update-not-works-configtool-nozzle-temp-limit

It looks like there is a bug in the config tool where M143 isn't being generated for the hotend, which would lead to the default limit being applied.

I've also asked if there is a hard upper limit for setting M143.