ST3Di Modelsmart 280 - Duet Maestro repair/upgrade
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first measure the resistance at room temperature so that you can determine that it is a 100k ntc thermistor
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@Veti said in ST3Di Modelsmart 280 - Duet Maestro repair/upgrade:
thats the difficult part.
is there any way you can get documentation as to what the exact model number is of the thermistor?
Would there be anything on the part itself to provide a clue? I can go check.
I changed the R25 number based on what I'd seen others use. On initial test of the bed heater it threw an error as heating too slowly. I ran autotune and it then would heat up to 80c without error. I've a lot to learn.....
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@Blacksheep99 said in ST3Di Modelsmart 280 - Duet Maestro repair/upgrade:
I changed the R25 number based on what I'd seen others use.
the settings are specific for your thermistor model.
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@Veti to be clear, on the bed there are the power cables and then the thermistor cables right?
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@Veti said in ST3Di Modelsmart 280 - Duet Maestro repair/upgrade:
@Blacksheep99 said in ST3Di Modelsmart 280 - Duet Maestro repair/upgrade:
I changed the R25 number based on what I'd seen others use.
the settings are specific for your thermistor model.
Understood, thanks.
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@Blacksheep99 said in ST3Di Modelsmart 280 - Duet Maestro repair/upgrade:
to be clear, on the bed there are the power cables and then the thermistor cables right?
that is normally the case
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can you post a picture of the thermistor?
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Each heater is 120x150mm
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@Blacksheep99 said in ST3Di Modelsmart 280 - Duet Maestro repair/upgrade:
The probe\end stop has one but shared power circuits, the servo has a single feed to one pin with shared power, the hot ends have a single pin but share power also.
Shared +5V or +3.3v power and ground to the Z probe and the endstops is OK, if they use the same power voltage. Sharing power with the servo is also OK if they all need +5V power.
Shared +VIN power to two heaters is OK as long as the cable can handle the current for two heaters.
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@dc42 said in ST3Di Modelsmart 280 - Duet Maestro repair/upgrade:
@Blacksheep99 said in ST3Di Modelsmart 280 - Duet Maestro repair/upgrade:
The probe\end stop has one but shared power circuits, the servo has a single feed to one pin with shared power, the hot ends have a single pin but share power also.
Shared +5V or +3.3v power and ground to the Z probe and the endstops is OK, if they use the same power voltage. Sharing power with the servo is also OK if they all need +5V power.
Shared +VIN power to two heaters is OK as long as the cable can handle the current for two heaters.
Thanks @dc42 I'll check the above. The two heaters are using the installed cabling so I should assume that it is up to the task. I am using the same PSU etc.
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It has been mentioned in one of my other threads but worth me double checking. With my 24v psu I will need to change the fans on the printer to 24v also? the current ones are 12v. I think it's easier to replace than buy a converter?
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Either way to be honest.
My preference is to use the correct voltage fans but other people are happy with buck convertersOwns various duet boards and is the main wiki maintainer for the Teamgloomy LPC/STM32 port of RRF. Assume I'm running whatever the latest beta/stable build is
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have you measured the resistance ?
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@Veti said in ST3Di Modelsmart 280 - Duet Maestro repair/upgrade:
have you measured the resistance ?
169.1 Kohms If i read it correctly. That is at room temp which is cool today as there's no heating on at the moment in that room.
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modules:composer.user_said_in, @Blacksheep99, ST3Di Modelsmart 280 - Duet Maestro repair/upgrade
That is at room temp which is cool today as there's no heating on at the moment in that room.
which is about what temperature?
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@Veti thermostat in that room says 12c
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@jay_s_uk said in ST3Di Modelsmart 280 - Duet Maestro repair/upgrade:
Either way to be honest.
My preference is to use the correct voltage fans but other people are happy with buck convertersI think I side with you. I'll order some fans
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ok thats inline with a 100k ntc thermistor.
but which one is not as easy to determine.
can you put the thermistor at 100C using a known good temperature measuring tool?
i.e here is a beta 3950 resistance table.
https://www.keenovo.com/NTC-Thermistor-R-T-Table.pdf -
@Veti said in ST3Di Modelsmart 280 - Duet Maestro repair/upgrade:
ok thats inline with a 100k ntc thermistor.
but which one is not as easy to determine.
can you put the thermistor at 100C using a known good temperature measuring tool?
i.e here is a beta 3950 resistance table.
https://www.keenovo.com/NTC-Thermistor-R-T-Table.pdfI'm not sure how I'd go about that especially with what I have available at the moment. Am I daft thinking i could try suspend it in some boiling water and measure it then?
