HE Temperature goes beyond selected after pid tuning
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Suddenly my printer reported an error on HE heater.
"The temperature doesn't rise as expected 1.4 C/sec"
I haven't changed my setup and this error started suddenly.
I changed the thermistor, testing the old one doesn't go over 180c.
With the new thermistor ,with HE at room temperature, I made a new pid tuning that succeded.
Now if I point to 205 celsius the HE goes up till 215 and stay there for some time slowly falling back.
Can someone point me on how to fix this.
This is teh curve I obtain pointing at 205
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@claustro said in HE Temperature goes beyond selected after pid tuning:
thermistor
is it the same type of thermistor? if no, did you change the thermistor config?
what were your old pid values, what are your new ones? -
@claustro said in HE Temperature goes beyond selected after pid tuning:
I changed the thermistor, testing the old one doesn't go over 180c.
are you getting thermistor and heat element confused?
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Yes is the same thermistor bought in the same shop. Unfortunately, I didn't copy the old pid , I'll post the current when I'll be back home.
The thermistor and heating cartridge have different connectors so I can't swap them.
I also wrote to the seller of the thermistor for having confirmation of the B variable.
I really can't understand what's wrong. -
M307 H1
Heater 1 model: gain 524.9, time constant 300.0, dead time 4.3, max PWM 1.00, calibration voltage 24.0, mode PID, inverted no, frequency default
Computed PID parameters for setpoint change: P23.5, I0.653, D71.4
Computed PID parameters for load change: P23. -
what temperature did you use for the pid tuning?
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Thank you for your answer. I did another pid tuning lowering the target temp from 240 to 220 and now I am printing with a target of 205 and temp stay in range.
The only strange part is the fluctuation during the first part of printing.I don't know but sometimes I have this temp error which then resolve by itself without an explanation
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@claustro
that could be a problem with interference, the fan turning on or with a bad crimp on the wire. -
thank you very much for your help, I am gonna re-crimp the cables
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Definitely seems like a cabling issue. jumps and dips like that in the graph could be noise, so try to keep the thermistor cable separated from other noisy cables like heaters, fans, steppers and see if it improves the graph. The thermistor sensor itself could also be faulty.
