Free working Cetus MK3 - Thermistor cap!!!
-
@supset said in Free working Cetus MK3 - Thermistor cap!!!:
reprap has no adjustable temperature limits
https://duet3d.dozuki.com/Wiki/Gcode#Section_M143_Maximum_heater_temperature
so having
M143 H1 S450in the config should help, but iirc you had this in a different thread, and looking at the curve it does flatten out like its reached its set point or highest temperature.does the LED for E0 stay on all the time when its at 305C or does it start turning off before reaching 305C?
and do you have any other means of measuring the tempearure to determine if the thermistor is just giving you a bad reading?
-
@dc42 The previous heat creep was due to the fan being off - ( M107 command in the print G code )
that has been corrected and is always on, now it just plateaus at 305c
-
-
@bearer 290 C has maintain temperature accuracy, but I will try the 305C, to see if it stays active, if that’s what you mean, I will test
It just seems to plateau, it simply won’t go any higher, weird it’s a 50 W heater cartridge by slice engineering combined with the 450 C thermistor and the mosquito magnum so it should reach the 450 C temperature - unless the firmware or the duet 3-D 2 Wi-Fi board can’t handle it
I’m running 24 V 300 W power supply
-
@supset said in Free working Cetus MK3 - Thermistor cap!!!:
It just seems to plateau, it simply won’t go any higher
and if the LED stays on then you're either got an underpowered cartridge or just loosing as much heat as you can add.
if the LED goes out the duet is limiting the power to the heater and its a config/sensor/gremlin issue.
depending on that we can start focusing on narrowing it down
-
So I just tried attaching a pot to E0 and copied your config. Set the pot to 750-ish oms which should be about 300C
turned the resistance down until I got about 450C and it measures about 144 ohm
so the sensor config and spec sheet seems to working correctly on duet2wifi with rrf 3.1.1
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 M143 H1 S445 ; set temperature limit for heater to 445C M563 P0 D0 H1 F0 -
Is it definitely a 50W heater cartridge? Measure its resistance to check.
-
Is your power supply keeping up? What are you getting at the VIN terminals when trying to reach temp?
-
@bearer LED? On the motherboard?
sensor - you mean the heater cartridge?
-
@supset said in Free working Cetus MK3 - Thermistor cap!!!:
@bearer LED? On the motherboard?
yeah ref https://duet3d.dozuki.com/Wiki/Hardware_Overview#Section_LED_indications
-
@bearer said in Free working Cetus MK3 - Thermistor cap!!!:
“a pot”? Where did you turn down the ohm, is this a file configuration
-
@bearer i’m relatively new at this, learning quite quickly, thanks for your help, we’re almost there I think, copying your config Code will work?
-
“a pot”? Where did you turn down hms, is this a file configuration
don't worry too much about the details, but I used a variable resistor (aka potentiometer, shorted to pot) to mimic your sensor on order to see if the the firmware would map the resistance to a temperature according to the google sheet you linked to - and it did.
copying your config Code will work?
it should be the same config i copied from your other thread, I just tried to verify that it was correct to rule out some factors.
please try heating it up again and take a look at the LED for the E0 heater down in the corner of the board and see how it behaves when leading up to the temperature plateau; also as Phaedrux points out, keep an eye on the Vin reading in DuetWebControl as the printer goes from idle, to heating and to settling on the plateau.and see if it changes much.
