Givens Control Engineering Inc. is combining its experience with process control tuning, process control engineering, data acquisition and software development to develop a PID Tuning software tool. Expected completion date is March 2010.
Tune-Plus will analyse bump test data collected through the DataLogger product, through OPC, DDE or imported from a text file*. It will characterize a series of bumps (for time constant, dead time, process gain etc.) and recommend tuning parameters. In all situations, the user will be able to adjust the overall speed of the control with a single parameter. The tuning values (P, I & D values) will be calculated from that parameter and the characterized values. The tuning method used will be Lambda/IMC.
The Lambda tuning method has been very successful with a wide variety of loop types. It emphasizes control stability with no overshoot (to a setpoint bump of a loop controlling a first-order process) and is tolerant of a varying process gain with process conditions (for example, grade or product run, throughput/production rate).
The application will include a tuning database where records of past tuning work, variability and notes will be recorded by the software everytime tuning is done. This addresses one of the major problems in process control: who tuned what, when and why; where did the current tuning parameters come from and when.
Tune-Plus will include a sophisticated simulator so that you can see the effect of changing tuning parameters, of repairing a valve with stiction and/or backlash, of the effect of filtering etc.
The product will include Analyse-Plus. Current owners of Analyse-Plus will be able to upgrade to the new tuning product without losing any of its functionality.
Because the product can tune loops based on bump test data from a variety of sources, it will be a software-only product. In other words, it can be purchased with or without the DataLogger just like Analyse-Plus.
* The product has special importing tools for the Bailey and the Metso DCS systems.
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