Maxing out at 305c - ideas thoughts?

supset

Maxing out 305c ideas?

Duet 3D 2 Wi-Fi - running reprap 3.1.1

Here’s my set up

Mosquito magnum
Bondtech BMG-M ( not relevant but here it is )
Slice high temperature thermostat 450c
Slice heater ( 24v )
Duet 3D 2 Wi-Fi - running reprap 3.1.1
Configured thermistor with the reprap configuration tool to 445c .json file reflects that - i’m stumped
thermostat and heater are properly installed

Heater section of config.g
—-

; Heaters
M308 S0 P"bedtemp" Y"thermistor" T100000 B4138 ; configure sensor 0 as thermistor on pin bedtemp
M950 H0 C"bedheat" T0 ; create bed heater output on bedheat and map it to sensor 0
M307 H0 B1 S1.00 ; enable bang-bang mode for the bed heater and set PWM limit
M140 H0 ; map heated bed to heater 0
M143 H0 S120 ; set temperature limit for heater to 120C

M308 S1 P"e0temp" Y"thermistor" T500000 B4723 C1.19622e-7 ; configure sensor 1 as thermistor on pin e0temp
M950 H1 C"e0heat" T1 ; create nozzle heater output on e0heat and map it to sensor 1
M307 H1 B0 S1.00 ; disable bang-bang mode for heater and set PWM limit

; M140 H1 ; map to heater 1
; M143 H1 R445 S445 ; set temperature limit for heater to 445C
M143 S445 ; set temperature limit for heater to 445C

—-

Thought I was getting closer

M303 H1 S240

https://duet3d.dozuki.com/Wiki/Tuning_the_heater_temperature_control

It’s either configuration, or reprap has no adjustable temperature limits

—-

; Heaters
M308 S0 P"bedtemp" Y"thermistor" T100000 B4138 ; configure sensor 0 as thermistor on pin bedtemp
M950 H0 C"bedheat" T0 ; create bed heater output on bedheat and map it to sensor 0
M307 H0 B1 S1.00 ; enable bang-bang mode for the bed heater and set PWM limit
M140 H0 ; map heated bed to heater 0
M143 H0 S120 ; set temperature limit for heater to 120C

M308 S1 P"e0temp" Y"thermistor" T500000 B4723 C1.19622e-7 ; configure sensor 1 as thermistor on pin e0temp
M950 H1 C"e0heat" T1 ; create nozzle heater output on e0heat and map it to sensor 1
M307 H1 B0 S1.00 ; disable bang-bang mode for heater and set PWM limit

; M140 H1 ; map to heater 1
; M143 H1 R445 S445 ; set temperature limit for heater to 445C
M143 S445 ; set temperature limit for heater to 445C

—-

See snaps

That tuning was the magic potion capped out at 302c

A Former User

looking at the curve I'd say your either your temperature reading is wrong, or you're actually reaching the limit of what the heater can do with the losses it has.

M308 S1 P"e0temp" Y"thermistor" T500000

got any specs on the thermistor?

supset

@bearer

https://www.sliceengineering.com/collections/accessories/products/thermistor-high-temperature

supset

@bearer

https://docs.google.com/spreadsheets/d/1904x5JK-Sup-cX5DqHiiZWaFVTK6_PQBFxgi_6yXEJw/edit#gid=0

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.