Heating issues
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What prevents the hotend from reaching the desired temp during tuning? Is it just too slow?
https://docs.duet3d.com/en/User_manual/Connecting_hardware/Heaters_tuning
See here, especially the troubleshooting section. You may be able to increase the deadtime to allow the tune to complete.
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The biggest issue before with the heaters was the supply voltage being too low.
I now have a power supply for this retrofit that has 24V.
Heaters can now be tuned and reach the desired temperature.
Running some test prints for microstep tuning, but I am receiving a heater fault on the extruder heater when the printed part begins.
It will reach temperatures; print the raft I have set. Begin the cube test print, then give me this fault."Heater 0 fault : exceeded allowed temperature excursion: target 254 deg C actual 237.8 deg C."
How can I remove this fault from happening? I understand M570 can change the fault parameters, but why would I be losing that much temperature during the print?
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@djthuma Does the fan come on at that point and the heater can't keep up?
Did you use M303 H1 or M303 T0 to tune the hotend? -
@djthuma said in Heating issues:
I now have a power supply for this retrofit that has 24V.
Hang on, are you saying you were running a 12v power supply before and now you've put in 24v?
Are the heaters 24v as well?
@djthuma said in Heating issues:
"Heater 0 fault : exceeded allowed temperature excursion: target 254 deg C actual 237.8 deg C."
This could be because you're putting 24v into a 12v heater, which is very dangerous.
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@Phaedrux
The heater is a 24V heater paired with the bondtech direct drive and mosquito magnum hotend. PT100 sensor. PT 100 daughterboard on a duet 2 wifi.I did tune both heaters. The fan does come on at the layer one as you described and I found a previous post saying that could cause some temp drop if not pointed at the print. I turned off the fan and did not receive the same error.
The other thing I did was tune the H0 to a higher temperature average because it was giving a error that the sensor couldn't reach temp.
I think these things will resolve the issue.
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I am having an odd issue with the heater and fans.
When I begin heating the bed or extruder, the small fan on the extruder heat sink slows down.
Then when I am printing a calibration cube the extruder temp goes past the active set temperature.
I think theyre related.I have that fan set on an always on output, so it is not controlled by thermostat.
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Is your power supply struggling to keep up?
Monitor the voltage with a multimeter durings these times and see if it holds steady at 24v, or if it droops.
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@Phaedrux
The power supply is dropping to about 18 V when I turn on the extruder heater or bed heater.It is a 24 V power supply, heater and bed heater.
So I am not sure why it is dropping voltage.
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@djthuma, you are drawing more power than the power supply is able to support (either that or it is a defective power supply)
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Thank you for the advice!
I feel dumb, but I forgot to switch my new power supply to 110V for US.
So it would drop voltage when operating, expecting 220 input.
Retuning heaters now.
Should be a resolved issue! Thanks again!
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D'oh!
Easy mistake to make. Ask me how I know.
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