Heater fault....

Chriss

Hi *,

I have a Voron v2.4 with a failing bed heater. The firmware (3.4.0beta3) reports from time to time that the temp rises to fast or to slow. And Sometimes it is about 0.5°C/sec sometimes 0.9°C/sec:

Error: Heater 0 fault: temperature rising much more slowly than the expected 0.5°C/sec

I have the feeling that that depends a bit when I made the pid tuning. It seems to me that the bed is failing more frequent when I warmup with open doors but the pid tuning was performed with closed doors, or vice versa.

M308 S0 P"0.temp0" Y"thermistor" T100000 B4138	; configure sensor 0 as thermistor on pin temp0
M950 H0 C"out6" T0 Q10							; create bed heater output on out0 and map it to sensor 0
M307 H0 B0 S1.00								; disable bang-bang mode for the bed heater and set PWM limit
M140 H0											; map heated bed to heater 0
M143 H0 S120									; set temperature limit for heater 0 to 120C

M307 H0 R1.254 C227.635:227.635 D5.48 S1.00 V24.4 B0 I0

And it seems to me that this appears only when I heat up from room temperature. It looks more stable when I heat up from 80 to 100.

Any tips?

Cheers, Chriss

SIam

@chriss take a look in to this threat: https://forum.duet3d.com/topic/24842/rrf-3-4b3-bed-heater-fault/2?_=1631625707741

Chriss

@siam Not again a bug .....

Did you found a (temp) solution?

Cheers, Chriss

SIam

@chriss at the moment i have reduced the r Value to the half in the heating process when the heater have reached the end temp i set the r value to the normal value

M307 H0 R0.466 C285.252:285.252 D1 S1.00 V24.3 B0 I0

Chriss

@siam Thanks, I will play a bit with that....

Chriss

@siam

That did not help me, unfortunately. Are you sure that it should be the half? Not the double?

Cheers, Chriss

SIam

@chriss hhmm i use this

M307 H0 R0.266 C285.252:285.252 D1 S1.00 V24.3 B0 I0

and it's working for me, The calculated settings are

M307 H0 R0.466 C285.252:285.252 D1 S1.00 V24.3 B0 I0

Chriss

@siam

Thanks.. I will play a bit more with it....

PCR

@chriss @dc42 same problem here

groing from 3.3 to 3.4b3 heater fault with heater 0(bed)

dc42

@pcr the heater fault detection is too sensitive in 3.4beta3. It is reduced in the forthcoming 3.4beta4.