ST3Di Modelsmart 280 - Duet Maestro repair/upgrade
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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 converters -
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?
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can you post a picture of the thermistor in the hotend?
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@Veti said in ST3Di Modelsmart 280 - Duet Maestro repair/upgrade:
can you post a picture of the thermistor in the hotend?
I'll try. I've a work call now but will do it after.
thanks for your help.
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How was the original board configured - maybe you can borrow some info from there?