@alankilian

Thanks for your help Alan.
The wiring was incorrect. Now that I have it correct, it's working.

I would like to have a repeating beep when the filament run out sensor triggers.

Has anyone done this?

Thanks,
David

@weed2all

My mistake. You are correct.
I missed it even after reading the instructions a few times.
Of course I wasn't looking for that as I was trouble shooting, but that is no excuse.
Thanks for pointing it out.

@dc42 said in Unable to tune chamber heater:

@davidewen what temperature do you heat the chamber to, how long does it take to get there, and what is the ambient temperature? These figures will give me an idea of the heating rate, so that can see whether the current limits are appropriate.

Thanks for getting back to me.

I generally heat the chamber to 60C.
I haven’t timed it, but I think it takes about 30 minutes.
Ambient temperature is 70F

@dc42, @Tinchus, @hackinistrator, @RogerPodacter

I finally got this to partially work.
I had to re-run RRF config and get a new config.json file.

This happened to me when I changed from a Z-Probe to a Z-Switch. No amount of changing config.g would work until RRF was run.

I still get errors occasionally, but not every time.

@dc42 , I think this still needs to be looked into. It may also be a good idea to figure out why a new config.json file helps alleviate the problems.

@hackinistrator

Thanks for the input. I'll give your R0.001 suggestion a try.

Re: heater not reaching temp. It does, and I had no problem with this issue prior to updating FW as also stated by @Tinchus.

After running autotune again, and kind of passing, here's what I received as settings.

The first line is actual autotune settings that don't work.
The second line is modified with the 0.001 setting as suggested.

I was able to complete a 50°C chamber heat with it.

However, I cannot start an actual print unless I pre-heat the chamber. Printing fails with the typical error of expected this heat time, but got this heat time.

;M307 H2 R1.491 K1.725:0.000 D9.50 E1.35 S0.10 B0			; autotune settings
M307 H2 R0.001 K1.725:0.000 D9.50 E1.35 S1.00 B0			; autotune settings

@dc42 - have you had a chance to look into this problem?

@dc42

Have you had a chance to look into this?

I have not been able to get anything to work.

I have been able to get the autotune to pass multiple times, but the parameters don't work after entering them in.

@Tinchus

Thanks, I will try that now.

@Tinchus

Thanks for the response.
Same for me. I can trick the system to finish the autotune, but still can not get the system to work in normal use with the parameters autotune gives.

Even changing the PWM back to 100% is not working for me.

I'm not sure what values would even be helpful.

I only have (1) 250w heater, so my chamber heats pretty slowly.
I need about 20-30 minutes to get to 50°C.

@Tinchus said in Unable to tune chamber heater:

I raised deadtime value A LOT. That way, autotune was able to finish.

When you said you raised dead time a LOT. Do you remember what value you used?

@Tinchus

Thanks for this info.
For whatever reason, it has only partially worked for me.
I can at least finish the tune, but I still can not run the chamber heater even after updating the M307 with the auto tune parameters.

The heater faults out with this error. The values will change based on the M307 settings, but it's always the same error that the temperature is rising too slowly.

Heater 2 fault: temperature rising too slowly: expected 0.14°C/sec measured 0.03°C/sec

@dc42

Thank you.

FYI; These are the results from my latest tuning attempt.

M303 H2 P1 Y1 S50 ; auto tune heater 2, default PWM (100%), Tuning Cycle Hystresis 1C 50C target

Warning: Auto tune of heater 2 failed due to bad curve fit (R=0.183 K=3.127:0.000 D=7.70)

@dc42 said in Hot End fan not being controlled by temp:

@davidewen that would almost certainly be from line 74, the M307 command with the very small R parameter.

Thank you for the feedback.
I'm working to get my chamber heater functional again.
I have another forum post going for that here.

https://forum.duet3d.com/topic/30954/unable-to-tune-chamber-heater

I have modified line 74 (now line 72) and I'm still getting the "bad model parameters" response.

Here's the new code for line 72. Let me know if you want the entire config.g file uploaded again.

Since the chamber heats up and cools down so slowly, should I just ignore this error?

M307 H2 R0.01 K0.200:0.000 D60 E1.35 S1.00 B1