Warning with PID tuning

wannathermal

Greetings
I a new to the Duet world having come from the Replicape world.
I have a Prusa I3 that I want to us with a Flex3Drive.

So I am running the PID autotune and I get this error. Everything works but I just want to check if this is really a problem.

16:04:28
Warning: Heater 1 appears to be over-powered and a fire risk! If left on at full power, its temperature is predicted to reach 714C.
Auto tune heater 1 completed in 118 sec
Use M307 H1 to see the result, or M500 to save the result in config-override.g

Here are the results of M307

16:15:03
M307 H1
Heater 1 model: gain 672.7, time constant 75.5, dead time 9.5, max PWM 1.00, mode: PID
Computed PID parameters for setpoint change: P2.1, I0.028, D14.0
Computed PID parameters for load change: P2.1, I0.116, D14.0

Thanks and I'll be here all week!

elmoret

What is your heater resistance and your power supply voltage?

dc42

I'm guessing that you are using an E3D or similar hot end with a 40W heater and a silicone sock. The silicone socks increase the heater gain substantially, hence the "fire risk" warning. It's not uncommon to see this. If it worries you, change to a 25W heater cartridge.

wannathermal

Yes to all! Thanks. And after tuning it is not an issue. Thanks