Chamer heating too slow error

  • Anyone know if there is a way to turn off the heating slowly feature on a heater? I have two 150w 24v heaters that I have hooked up as a chamber heater, but they heat very slowly. Every time I use it I get an error “Heating fault on heater 2, temperature rising much more slowly than the expected 1.8°C/sec”. I tried to add the “heating dead time” in the M307 to the max of 60 seconds, but it only increases by 2° in that time...

    Any help would be appreciated.

  • Think the only heater fault detection adjustment we have is M570.

    Are you running bang-bang rather than PID with a system that slow? Not sure if fault detection is any different but maybe worth trying bang bang if you aren't already doing so.

    Got any fans blowing over the heater or heatsinks on the heater? That may speed things up a touch by forceably circulating the air.

  • I do have fans on them, but it’s a pretty big chamber and not the best insulated. I’ll try changing to big bang and see what it does.

  • I ran into a similar problem when I was setting up the 500W chamber heater in my 420 liter corexy printer. I eventually got it to work- I'll post the config file tomorrow to see what I ended up doing. I believe it is under PID control.

  • administrators

    Have you run heater tuning on the chamber heater?

  • @mrehorstdmd Thanks mrehorstdmd. Looking forward to seeing your config.

    My current config looks like this:
    M141 H2
    M307 H2 B1 S1.0
    M143 H2 S120

    I tried adding the option D60 to the M307 command as well as changing B1 to B0 with little effect.

    Just an FYI; the heaters are setup using 2x solid state relays that I have wired up together and fans that I control separately

  • Well, thanks to @mrehorstdmd for the solution. I changed my M307 command to: M307 H2 A11 C99000 D2000 B1 which seemed to work. It started heating and didn't give me the error!

    The unfortunate thing is that is blew my 500w power supply (whoops). That was more my error more than anything else as I should not have tried to run that power supply more than 80% of its rated wattage. Good thing I have fuses on all of the electronics so all I did was blow the power supply and not kill all of the other electronics 🙂

    I'm going to put the original 300w power supply back on the main unit and get a second 450w power supply for the heaters (which is probably a bit safer anyway). The new power supply will arrive in the next couple of days and I'll post the results...

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