Hotend temperature overshoot - how much is acceptable?
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Hi,
I've recently changed my system from 12 volts to 24 volts. As a result, I've changed my hotend heater. I had a 50 Watts 24 Volts heater, so I used it. Following PID tuning (I am on firmware 3.2), the initial temperature overshoot is 6 degrees when the temperature is set for 200 degrees. Afterwards, it stabilizes and changes between 199.9-200.1 degrees. Then I turn on part cooling fans and it overshoots by 1.4 degrees, then stabilizing at 199.7-199.9 degrees for 30-40 seconds and then stabilizes at 199.9-200.1 When I turn off the cooling fan, the temperature decreases to 198.4, then overshoots to 200.4 and is stabilized at 199.9-200.1
Is the initial overshoot normal/expected? Is the behaviour of the heater in acceptable ranges?
Thanks...
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yes and yes
Don't forget that the thermistor isn't that accurate either ... not that it makes a difference to your question but we are not dealing with absolutes here -
What M303 command did you use to tune the heater?
that seems like acceptable overshoot.
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@drmaestro did you rerun heater tuning after installing the new heater? If so, you can get rid of the overshoot by reducing the A or R parameter in the M307 command for that heater. Try a 10% reduction.
