Re: PID Silvia Sydney
Hi there Mal,
Thanks for the link, has proven very useful.
I started again with the auto tune process, and this time its proven to be alot more stable. I think my problem before was starting the auto-tune feature before the temperature was reasonably stable, therefore skewing the settings.
Parameters as follows:-
p = 4.7
i = 187
d = 46
tv = .40 ( target value, this is the default btw, auto tune doesnt appear to modify this parameter )
With the new settings, while idle the setpoint is kept almost perfectly, every 30 seconds or so it might drop 0.1C but only for a brief moment. Recovery times after a shot will need a fair amount of tweeking though, as I observed the following (approximate times) :-
* initial overshoot of +0.5C (1 minute)
* slow decrease to +0.3C (1 minute)
* slow increase to +2.3C (4 minutes)
* this is where things leveled out (1 minute)
* slow decrease to setpoint (5 minutes)
Overall recovery of over 12 minutes. Which is actually fine for my usage, but Id like to rain that in to around 3 minutes if possible. Next step is to follow the guidelines in your link, onto round three
christian
Hi there Mal,
Thanks for the link, has proven very useful.
I started again with the auto tune process, and this time its proven to be alot more stable. I think my problem before was starting the auto-tune feature before the temperature was reasonably stable, therefore skewing the settings.
Parameters as follows:-
p = 4.7
i = 187
d = 46
tv = .40 ( target value, this is the default btw, auto tune doesnt appear to modify this parameter )
With the new settings, while idle the setpoint is kept almost perfectly, every 30 seconds or so it might drop 0.1C but only for a brief moment. Recovery times after a shot will need a fair amount of tweeking though, as I observed the following (approximate times) :-
* initial overshoot of +0.5C (1 minute)
* slow decrease to +0.3C (1 minute)
* slow increase to +2.3C (4 minutes)
* this is where things leveled out (1 minute)
* slow decrease to setpoint (5 minutes)
Overall recovery of over 12 minutes. Which is actually fine for my usage, but Id like to rain that in to around 3 minutes if possible. Next step is to follow the guidelines in your link, onto round three

christian

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