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

dc42

@hestiahuang did you run M303 heater tuning on the bed heater, and save the M307 result?

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.