Heating issues

jay_s_uk

@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?

Phaedrux

@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.

djthuma

@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.

djthuma

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.

Phaedrux

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.

djthuma

@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.

jens55

@djthuma, you are drawing more power than the power supply is able to support (either that or it is a defective power supply)

Phaedrux

https://docs.duet3d.com/en/User_manual/Connecting_hardware/Power_choosing

djthuma

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!

Phaedrux

D'oh!

Easy mistake to make. Ask me how I know.