Heating error on heater 1
-
At this point, 2/3 of my prints are failing because of hot end heater errors. I know my heater is over powered and autotune doesn't handle this situation all that well. However, I couldn't even manually tune because the heaters fault out while trying to tune.
Currently, it faults out when heating up, it faults out when the fan kicks in, it even can fault out mid print.
I get that the firmware is setup for maximum safety but is there a user configurable way to widen the safety margin or disable it until the tuning tools get to where they can handle my setup?
(In case I come across as too complainy here, I do appreciate the development effort!)
-
At this point, 2/3 of my prints are failing because of hot end heater errors. I know my heater is over powered and autotune doesn't handle this situation all that well. However, I couldn't even manually tune because the heaters fault out while trying to tune.
Currently, it faults out when heating up, it faults out when the fan kicks in, it even can fault out mid print.
I get that the firmware is setup for maximum safety but is there a user configurable way to widen the safety margin or disable it until the tuning tools get to where they can handle my setup?
(In case I come across as too complainy here, I do appreciate the development effort!)
Can you revert to a version of RRF before the heating changes were made, so you can use the legacy PID?
-
At this point, 2/3 of my prints are failing because of hot end heater errors. I know my heater is over powered and autotune doesn't handle this situation all that well. However, I couldn't even manually tune because the heaters fault out while trying to tune.
Currently, it faults out when heating up, it faults out when the fan kicks in, it even can fault out mid print.
I get that the firmware is setup for maximum safety but is there a user configurable way to widen the safety margin or disable it until the tuning tools get to where they can handle my setup?
(In case I come across as too complainy here, I do appreciate the development effort!)
Leon, if your heater faults when heating up, that should be easy to fix by increasing the dead time and/or reducing the gain in the M307 parameters.
To auto tune an over-powerful heater, you currently need to use a low P parameter in the M303 command, perhaps as low as 0.1.
If it faults when the print cooling fan comes on, that means the temperature has dropped by more than 10C. I am considering making this figure configurable in a future firmware version; but isn't a temperature drop of that size going to cause extrusion problems anyway?
HTH David
-
The problem is that the last 3 prints have failed due to heater faults whether the fan was on or not! Currently, my temperature hovers right at temperature but then there will be a quick excursion that immediately return to temperature. Honestly, I'm not sure why it has gone downhill so badly. I'm going to double check my wiring and try retuning tonight.
There are three things I'd like to see, which would dramatically help people like me:
1. User configurable temperature band.
2. User configurable time out of band. I will make the argument that a brief excursion should not fault the heater. A web console warning wouldn't be a bad idea, though.
3. When the heater faults, kill the print. It's not doing me any good running if it isn't extruding.Thanks!
-
A brief temperature excursion does not fault the heater. The error has to be maintained for more than 5 seconds before a fault is registered.
-
Interesting… I've never been able to catch it. I'll investigate and report back if I get a better understanding.
-
If you do manage to catch it, p!ease report the text of the initial heater fault message if you can.
-
The log says "Temperature Excursion too large".
It turns out that this problem, at least was due to a noisy thermistor. Probably from me zip tying the thermistor to the heater cartridge without enough slack for strain relief. Thanks for all your help!
I'll know later tonight if this fixed it.
-
I've also had a few issues with this. My heater is over-powered, but it was intentional in the hope that I could print fast and be able to reach higher temperatures (300C). The auto-tune worked brilliantly and it prints with no errors so long as the print temperature is below 220. If I increase it to 260 (or higher), it will fault mid print usually with the temperature going too high.
At higher temperatures, I think the thermal inertia is such that an excursion can last more than 5 sec. This usually happens on fiddly bits where the material flow reduces.
If it were possible to relax the thermal fault detection (perhaps with a strongly worded warning about fire, death & destruction?) I think it might help this.
On the fire front, I have a DIY thermal fuse. A short length of solder mounted a couple of cm above the heater. Even at 300C, it does not melt the solder - but either a flame or a temperature above 400 will. It required a bit of experimentation to get the separation right - but it seems to work. If the solder link breaks, it kills the mains via a SSR.
I suspect that an off the shelf thermal fuse with poor thermal contact to the heater would do just as well.
Si
-
@SimonRafferty
I believe this is what you need
http://reprap.org/wiki/G-code#M570:_Configure_heater_fault_detection -
Thanks Jackal - you're a star!
Si
