After 19 hours of printing: Printing paused:heater fault

dc42

The gain has gone down from 393 to 336, which is nearly 20%. That implies either that your heater has lost power, or that cooling of the hot end has increased. Check that the screws in the extruder heater terminal block on the Duet are still tight.

FBG

I see a thing….
the old value is with: M303 H1 S225 P0.6
the new value is with: M303 H1 S225 P0.5

is important this, or is indifferent?

dc42

Why are you using a PWM factor other than 1 when running M303? It's been standard to use full PWM when running M303 for several firmware versions.

FBG

This is incredible, now i do: M303 H1 S225 P0.5 and say:
Auto tune cancelled because target temperature was not reached

If i do: M303 H1 S225 say:
Warning: Heater 1 appears to be over-powered. If left on at full power, its temperature is predicted to reach 735C.
Auto tune heater 1 completed in 436 sec
Use M307 H1 to see the result, or M500 to save the result in config-override.g

Now the value in config-override is: M307 H1 A710.6 C318.6 D9.7 S1.00 V23.9 B0

dc42

Like many users, you have an over-powered hot end heater. You can still print with those values. For safety reasons you may wish to order a lower power heater cartridge.

FBG

I start the print again from the beginning, and after 20 hours now i can see than the temperature NOT is estable, why??
The first 20hours (aprox) is absolutely stable +/-1º and now with 30 hours:….

Now go from 216ºC to 233ºC

Of course same temperature is config in all print in 225º and only use T0
the value in config-override is: M307 H1 A710.6 C318.6 D9.7 S1.00 V23.9 B0

I don't have configured line M570 so i am frightened for the print, maybe go to give some error if the temperature continue fail?

Not errors show in console. I don't have fans or something than can cool the nozzle, chamber closed and same temperature in bed always

dc42

Undulating temperature usually means that the dead time parameter (D in M307) is too low. It could mean that the thermal contact between your heater cartridge and the heater block isn't as good as it used to be.

FBG

This extruder is used several months with arduino and marlin firmware without problems, i check the wires and thermal contact and absolutely ok.
The question is, Why after 20 hours start to fail?
I am thinking in use the M301 with PID parameters than i was use in the marlin firmware, instead of M303 system.
I don't finish to work perfectly with this M303 auto tuning

dc42

If it used to work but doesn't any more, then something must have changed. Your dead time parameter does look unusually high, suggesting that heat transfer from the heater cartridge to the heater block isn't as good as it should be. Values around 6 seconds are more usual for E3DV6 and similar hot ends. What type of hot end is it?

You could try running M303 tuning again and see if the dead time parameter has changed.

FBG

This:

https://e3d-online.com/v6-plated-copper-heater-block

dc42

Copper has a thermal capacity per unit volume about 50% higher than aluminium, so that explains the 50% higher dead time.

I suggest you increase the D parameter in the M307 H1 command enough to make the undulations go away. Try increasing it by 20%.

c310

I faced similar issue: searched forum, but none of the proposed solution helps.

as a sudden it gives heater fault. im on 1.21…

1-a) i replaced heater cartridge and checked all connections, including PT-100.
all looks fine. Run M303 H1 P1 S230 . No issues… M500 ..

1-b) after restart and even after power off problems does not disappear..
printer does resume with m562 + m916 but minutes later all repeats again…

2-a) increased tolerance M570 S120 H1 P10 to avoid some peaks.
2-b) after M562+M916 it starts printing, but in less than a second temperature starts dropping very slowly.
chart is clean (no spikes, holes etc)

i thought it is a large file… tried to print 101010 cube. same at around 50% completion ....
replaced SD card, no luck. i think i have tried everything but PT-100 sensor that i do not have in stock...

what can i do to fix the issue???

[c]21:30:42 Error: Heating fault on heater 1, temperature rising much more slowly than the expected 0.3°C/sec
21:30:32 T-1
21:30:30 M562
21:29:48 Printing paused
21:29:46 Error: Heating fault on heater 1, temperature excursion exceeded 15.0°C
Resume-after-power-fail state saved
[/c]

M307 H0 A90.0 C700.0 D10.0 S1.00 V0.0 B1
M307 H1 A272.9 C189.4 D2.2 S1.00 V12.0 B0
M307 H2 A340.0 C140.0 D5.5 S1.00 V0.0 B0
M307 H3 A340.0 C140.0 D5.5 S1.00 V0.0 B0
M307 H4 A340.0 C140.0 D5.5 S1.00 V0.0 B0
M307 H5 A340.0 C140.0 D5.5 S1.00 V0.0 B0
M307 H6 A340.0 C140.0 D5.5 S1.00 V0.0 B0
M307 H7 A340.0 C140.0 D5.5 S1.00 V0.0 B0

dc42

The "temperature rising more slowly than expected" error normally means the heater has not been tuned. You saved the results to config-override.g with M500, but does config.g have a M501 command at the end to run config.g?

The "temperature excursion exceeded" error is explained on the wiki page. The error message you pasted says the limit is 15C (the default), which is not what your M570 command indicates.

c310

David, can it be something with my board or firmware (fault detection algorithm) ??
i replaced heat cartridge again... and system was printing fine for a day or two. yesterday as a sudden heater fault again.
i pulled it from outlet and decided to try next morning... results are very strange... very.

my steps:

i switched system on and
almost immediately connected via web interface.
almost immediately i faced "temperature excursion exceeded 15.0C"

in wiki this error residing in "maintaining temperature" section. but in my case it was only heating up for few seconds.

config.g related
M563 P0 D0 H1 F0
G10 P0 S200 R180
M570 S120 H1 P10 T15
M305 P1 X200

@dc42, how that can take place???? how does duet board detect failure???
is there something i can test on the board?

dc42

If you got that heating fault message after you reconnected DWC to the Duet after the Duet had already reported a heating fault, then that message is probably a duplicate of an earlier one.

If you restarted the Duet after that heating fault, then I suspect you have both temperature setting and tool selection commands in config.g. I see that you have G10 P0 S200 R180 in config.g. Do you have a T0 command in config.g as well? If so, do you really mean to heat up the extruder as soon as the printer is turned on?

c310

yes, T0 is there.

and i keep printer off when not printing, and i found it convenient to heat up head immediately.

by the way, is there similar command to heat up bed?

i still got the same error after ~30 sec after power on....
"Error: Heating fault on heater 1, temperature excursion exceeded 15.0°C"

so what is your verdict over my machine?

dc42

I never expected anyone to put a heating command in config.g so I haven't tested it or thought through the potential complications.

c310

i removed G10 from config.g now printer starts without error.

after print starts .... some time later temperature very slowly goes down.

could it be some power issues? i have ordered new heaters, but afraid that would not help .

dc42

Yes it could be power issues. Check the VIN voltage display in Due Web Control. Also check that the screws in the terminal blocks that the heaters are connected to and the screws in the VIN terminal block are still tight.

c310

what kind of AWG will be suitable for 1m cable and 50W heater?