Re: Help with Oxigen tuning
: 26 feb 2008 18:31
Do you know if there is somewhere a functional description of the woody box?
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The 30 is in min. and you should just keep that, it's only used in boilers where you can burn other things than pellets, by feeding it manually into the boiler. In that case it shouts off the pellets feed, and only control the air feed.joukeder skrev:Hi Torben,
I feel very assured that you are looking over my shoulder. It is so good that you verify and challenge my train of thought. Thanks!
When manually controlling burning and putting the high auger at 30 Oxygen goes down to .1 and certainly a lot of smoke exits the chimney stack. Burning is dark red and light is very low on the lux meter.
Back to auger high at 21 and Oxygen is around 7.2 and NO smoke.
I have a computer controlled telescope. It has only so-so mechanical gear. The designers compensated that by having the electronics compensate for the peculiarities of that gear train. They say its cheaper then making better mechanics and it works very well!
Extrapolating that to the burner you would expect that the designers know that the auger feed is not all THAT accurate anyway and compensate that by steering the auger to compensate for the feed anomalies. If that is so, we are perhaps looking at a feedback problem? at the Oxygen gain of 100 it was perhaps overcompensating and oscilating.
Has anyone experimented with the PID parameters?
Or do you still think its mechanical?
I cleaned the burner unit including the ventilator with pressured air a few days ago. There was not too much debris in it anyway. The ventilator is working very freely. It has a very long wind down time.
Whats bothering mee is why would it burn about OK at 21 AUger high where it should be about 33?
Regards
Jouke
Don't you have a manual for it.joukeder skrev:Do you know if there is somewhere a functional description of the woody box?
The PID has to do with the regulation of effekt, and has as so nothing to do with the oxygen control.joukeder skrev:Has anyone experimented with the PID parameters?
Regards
Jouke
No I don't think the seals can effekt the draft much, so the chimny seems to be allright.joukeder skrev:I have a draft reducer installed in the new Stainless steel chimney and there is nothing else connected to this chimney.
I am going to check all the seals on the unit to see if they are tight. But the unit is new so I do not expect any problems. Would you know any area's where others had problems with seals?
Jouke
The essence is, that the blower low should be set together with the pellets low to give you a good fire without smoke and be set as low as it can. in practice the blower canøt go any lower than about 5 in order to give a stable air.joukeder skrev:Hi Torben,
There is a sticky on the general board about the ventilator settings for Bio comfort. I can't read it. Would you like to tell be what the essence of it is?
Jouke
Hi Joukejoukeder skrev:Hi Torben,
I have been monitoring the Oxygen control and came to the conclusion that the inter-update timing is too long. I measure it as 1 min 05 sec.
If I steer the Auger high value manually in-between these updates I am able to control oxygen much better the the CPU.
Is it possible the set the inter-update timing?
I don't know if the system is just waiting or really integrating the delta Oxygen during that time, but it is clearly too long.
I think that with the ability to set this (integration) time combined with the gain should give a good Oxygen control, evening out the irregularities of my auger system.
Regards
Jouke