Heater fault on heated bed because it's rising to slow.

[hestiahuang]

@dc42
yes, I did. Ran Auto PID and saved, also restarted. But still failed, even I used bangbang mode, full speed, I mean.



After above, I got this too

Then I changed the code and built Beta7 version, everything looks good now.
I adjusted the factor 0.5 to small value simplely => RepRapFirmware\src\Heating\LocalHeater.cpp => Line#317 => if (actualTemperatureRise < expectedTemperatureRise * 0.5)

[hestiahuang]

@dc42 I guess this should be new good feature, it will be perfect if it is better to enlarge the limitation. Or can have parameter to set expected rate.

[hestiahuang]

Need to resume my printer can print first, so I call it simple way...

[hestiahuang]

@dc42
Read from change history, issue is involved from Beta3 and keeping improving.

[hestiahuang]

@dc42
similar topics
https://forum.duet3d.com/topic/24842/rrf-3-4b3-bed-heater-fault/14?_=1639653214558
https://forum.duet3d.com/topic/24809/3-4-0-beta-3-heater-0-fault/12

[dc42]

@hestiahuang we have made changes in 3.4.0beta 7 that we believe resolve the majority of these cases.

[hestiahuang]

@dc42 You did great! Thank you so much!

[joeko]

now with beta7 i also get this error. with rrf 3.3 all was fine

[Exerqtor]

@joeko
Have you re tuned the heater after upgrading to b7? I haven't gotten around to test mine btw, so just asking out of curiosity

[joeko]

@exerqtor said in Heater fault on heated bed because it's rising to slow.:

@joeko
Have you re tuned the heater after upgrading to b7? I haven't gotten around to test mine btw, so just asking out of curiosity

yes after update from 3.3 to this beta7 i did an pid tuning for bed and hotend with m500. with 3.3 there was no problem. i reduced the r in 307 to 0.19 and was able to heat the bed and print

[Exerqtor]

@joeko said in Heater fault on heated bed because it's rising to slow.:

@exerqtor said in Heater fault on heated bed because it's rising to slow.:

@joeko
Have you re tuned the heater after upgrading to b7? I haven't gotten around to test mine btw, so just asking out of curiosity

yes after update from 3.3 to this beta7 i did an pid tuning for bed and hotend with m500. with 3.3 there was no problem. i reduced the r in 307 to 0.19 and was able to heat the bed and print

Well in that case it looks like the heater tuning needs more work @dc42

[Gixxerfast]

@exerqtor said in Heater fault on heated bed because it's rising to slow.:

Well in that case it looks like the heater tuning needs more work

Actually, I have more heater problems as well with the b7 than I had with the b6. Instead of one error while heating up that just could be restarted I now have to restart it three times. And I have done the heater tuning (pid calibration).

Thing is a have a active carbon filter under the bed where the fans kicks in at 65C. Although it's a very low airflow it seems to disturb the heating process.

I would like an option to just turn all this control off. Max temp supervision is enough for me as far as I can understand it now.

Sorry to hog in in this thread.

[SIam]

Short feedback from my side, the problem is not solved

The Result from the pid tuning with RFF 3.4.b6:
M307 H0 R0.460 C286.278:286.278 D0.90 S1.00 V24.3 B0 I0

and the result from PID tuning with RRF 3.4.b7:
M307 H0 R0.484 K0.438:0.000 D0.85 E1.35 S1.00 B0

and the error:
Error: Heater 0 fault: temperature rising too slowly: expected 0.43°C/sec measured 0.19°C/sec

[hestiahuang]

@siam @joeko pls refer to the workaround to make your printers work first. Change the code and build at your local, then flash it. The workaround I posted above.

[hestiahuang]

@hestiahuang said in Heater fault on heated bed because it's rising to slow.:

@dc42
yes, I did. Ran Auto PID and saved, also restarted. But still failed, even I used bangbang mode, full speed, I mean.



After above, I got this too

Then I changed the code and built Beta7 version, everything looks good now.
I adjusted the factor 0.5 to small value simplely => RepRapFirmware\src\Heating\LocalHeater.cpp => Line#317 => if (actualTemperatureRise < expectedTemperatureRise * 0.5)

Quoted here.
However I don't have dropbox, and can't share my firmware here. Good Luck!

[hestiahuang]

@hestiahuang said in Heater fault on heated bed because it's rising to slow.:

@hestiahuang said in Heater fault on heated bed because it's rising to slow.:

@dc42
yes, I did. Ran Auto PID and saved, also restarted. But still failed, even I used bangbang mode, full speed, I mean.



After above, I got this too

Then I changed the code and built Beta7 version, everything looks good now.
I adjusted the factor 0.5 to small value simplely => RepRapFirmware\src\Heating\LocalHeater.cpp => Line#317 => if (actualTemperatureRise < expectedTemperatureRise * 0.5)

Quoted here.
However I don't have dropbox, and can't share my firmware here. Good Luck!

Highlight the code for you all again.

I adjusted the factor 0.5 to small value simplely => [RepRapFirmware\src\Heating\LocalHeater.cpp] => Line#317 => if (actualTemperatureRise < expectedTemperatureRise * 0.5)

[SIam]

@hestiahuang your workaround is not for everybody to make, so the easier way is to half the R value and the bed is heating without error

[hestiahuang]

@siam I want to say even I use bangbang mode the issue is still, bangbang is using the full power(24V) already. So code change is the only way to me.

[dc42]

@siam said in Heater fault on heated bed because it's rising to slow.:

Short feedback from my side, the problem is not solved

The Result from the pid tuning with RFF 3.4.b6:
M307 H0 R0.460 C286.278:286.278 D0.90 S1.00 V24.3 B0 I0

and the result from PID tuning with RRF 3.4.b7:
M307 H0 R0.484 K0.438:0.000 D0.85 E1.35 S1.00 B0

and the error:
Error: Heater 0 fault: temperature rising too slowly: expected 0.43°C/sec measured 0.19°C/sec

Please post the temperature plot while heating up the bed, to help me diagnose this.

[SIam]

@dc42 here you can download a short video:

https://kleinersonnenschein.eu/video/heaterfault.mp4