Chamber heater negative heating

kuon

I have a chamber heater, and I sometimes have this error:

Heater 10 fault: temperature rising too slowly: expected -0.04°C/sec measured -0.07°C/sec

Why the negative numbers?

Configured with (M307 configured with M303)

M950 H10 C"out9" T10 Q10                                    ; chamber heater
M307 H10 R0.669 K0.399:0.000 D21.93 E1.35 S0.70 B0          ; heater tuning without bang bang
M143 H10 S150                                               ; temp limit
M141 H10

The S0.7 is on purpose because the heater is 1600W and I don't want to burn everything while configuring it, so I am increasing the power gradually to ensure everything is configured correctly.

Phaedrux

@kuon said in Chamber heater negative heating:

Why the negative numbers?

Cooling rate. So it's cooling down faster than the tuned values would predict.

kuon

@Phaedrux ok, I thought it was weird because of the term "rising" in the error message.

The thing is the heater regulation is hard to tune because it highly depends on the chamber temperature.

Is there a way to make it more tolerant ?

Phaedrux

https://docs.duet3d.com/en/User_manual/Troubleshooting/Heater_faults

https://docs.duet3d.com/en/User_manual/Connecting_hardware/Heaters_tuning#troubleshooting

Chamber heaters can be tricky to tune.

kuon

@Phaedrux Yeah, I read those. I'll try again. One question persist, will M570 affect the rising temperature tolerance? Like doing an average over the time of the P parameter?