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  1. mjsbsouth

    Tuning AB SLC PID block for noisy flow rate

    I tested the process disturbance today and sadly, it is still too big of change for it to adjust to if you vent fast, but if you vent slowly (15psi/min), it works fine. Final Settings: P .5 I .1 D .01 Coriolis meters are hard to work with sometimes, but when they work, they are great, and...
  2. mjsbsouth

    Tuning AB SLC PID block for noisy flow rate

    I actually seem to have it tuned simply by setting the D to its min value (cant use 0 in our system), I to its minimum, and cut P in half. That was enough to destroy the exadgeration in the adjustments. I have yet to test venting on the new tuning though.
  3. mjsbsouth

    Tuning AB SLC PID block for noisy flow rate

    I am trying to control a pneumatic valve on a flow line which ranges from 0 to .5 #/min. The valve is run by an I to P of course and the line flow also depends on a pressure differential, because it is not pumped, but blown through the line. The noise seems to come from the flow rate read by a...
  4. mjsbsouth

    Tuning AB SLC PID block for noisy flow rate

    I am trying to determine how to tune the PID variables for a case where the flow rate jumps around up to 10%. I have not been able to try bumps yet, due to process use. The symptoms of the problem are: -Auto has a "sweet spot" and only works at that pressure difference. -Any jog in pressure...

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