Chamber heater
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I have a very low power chamber heater. It consists out of 4 100W light bulbs. It's purpose is to only increase chamber heat a bit over what the bed heater does - give it a bit of a boost so to speak.
If the bed heater is off and I turn on the chamber heater it barely affects the temperature. No matter what I do, the heater faults out after a little bit of time with a message that it is heating too slowly. My heater parameter line in config,g is:M307 H2 R0.02 K0.1:0.1 D20
I don't know how low I can go on the R parameter but if I set it to 0.01 I get an error on board startup indicating the parameters are not valid.
What I am trying to achieve is a situation where, if I set the chamber heater to 40C, the heater turns on below 40C and turns off above 40C. No PID magic but just very basic control.I suppose I could implement some sort of thermostatic control similar to cooling fans that come on at a certain temperature just in reverse (heater turns off at a certain temperature). I have not looked into this to any depth because it feels like a kludge to me. I gather another possibility would be to do the control via a macro ... but again it looks very much like a kludge.
Are there any other ways that would accomplish the end goal?
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@jens55 said in Chamber heater:
D20
You may have to increase the dead time since it would be a very slow rise.
Another option would be to move the thermistor closer to the heater, so that it's more tightly coupled, then finding a set temp for the heater that works to achieve the desired chamber temp.
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@Phaedrux, thanks, the suggestion of moving the thermistor closer to the 'heater' makes a lot of sense!
To your knowledge, is there an upper limit to dead time? -
I think the limit varies depending on the other variables, but I'm not certain. It's time in seconds though, so you may be able to measure a reasonable ballpark.
