Temperature control & fan speed

Discussion of the Ultimaker Original and Ultimaker Original + (kit and pre-assembled) printers
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Amedee
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Temperature control & fan speed

Post by Amedee » May 10th, 2016, 5:30 pm

I have an issue with my UMO that I didn't notice before (it might not be new, but I never noticed it before).

When I use the fan at a low percentage I cannot get a stable temperature...

I did some test with a print this evening, temperature set to 225°C.

- Fan off: after 2 or 3 oscillations, it sticks on 225°C and doesn't deviate anymore
- Fan 10-20%: it never stabilize jumps between 222 and 228°C!
- Fan 50%: a bit more stable 224-226°C
- Fan 100%: stable at 225°C, no deviation

I may be completely wrong, but I have the impression that the PWM fan influences the sensor.

Anybody already seen that?

(It is an old 1.5.3 board with thermocouple)
Phil.

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Neotko
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Re: Temperature control & fan speed

Post by Neotko » May 10th, 2016, 5:57 pm

The test was done with the bed making the air bounce on the block? I suppose not, so it's really weird I suppose. I know very very little of the 1.5.x boards.

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LePaul
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Re: Temperature control & fan speed

Post by LePaul » May 10th, 2016, 7:54 pm

I've only run 100% fan but tonight I plan to try out XT-CF20 with No Fan...I'll see if the temp bounces around

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Re: Temperature control & fan speed

Post by LePaul » May 10th, 2016, 9:02 pm

I'm printing now. No fan. Temp set to 256 and seeing it bounce around from 255 to 257. Nothing wider than that so far!

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martin-bienz
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Re: Temperature control & fan speed

Post by martin-bienz » May 11th, 2016, 2:54 am

Amedee wrote: Anybody already seen that?
Well, yes. I have that also. I think since the beginning. I just ignored it / accepted that PWM is messing with the sensor. I allways see it at the beginning of prints as the fan slowly starts up... I am pretty sure it's PWM and I assumed this is "normal". I see that because I sometimes have to manually help the fan to start in the beginning ... after the first layers when the fan kicks in fully, no issue.
I have never looked at it in detail... will try to the next print. But I am again off a few days (congress).

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Amedee
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Re: Temperature control & fan speed

Post by Amedee » May 11th, 2016, 3:13 am

Yes, I guess I never noticed before because it is common that when you start the fan the nozzle needs to adjust a bit.
What made me looked more in detail is that nowadays i tend to use very little fan and it stays in the 10-20% range while in the past it would just have been a transition...
Phil.

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