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Old 02-04-2011, 06:24 PM   #11
kevin0
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If you want to control overshoot, it may help to lower to proportional gain on your controller (the 'P' in 'PID'). Increasing the 'I' gain should get help rid of steady state error.

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Old 02-04-2011, 06:32 PM   #12
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Sounds like a tunning issue to me. The probe is in the correct spot then. If it was in the mash you introduce a lot of lag to the response time, hence jmer's method.

A forward feed from the mash tun would allow you to reach your temp a little faster but, I haven't seen any economy priced PID controllers that support that.

If you're fluctuating 2 deg F at the RIMS tube by the time it reaches the mash it will average out rather quickly.

Oh, I bet I know what you're problem is! There is a time variable that you need to set some times. This is how long the output should stay on at a minimum. I think Auber PIDs default to 2 seconds. If you set that variable to 0 it goes down to 0.5 seconds minimum on time. This is for things like compressors so you dont short cycle the hell out of them. If you have a different PID read the manual and look for a minimum on time variable.

What happens is the overshoots but cant turn the element off because it hasnt been on long enough.

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