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News Releases

2000




Optimal PID Settings for Varying Loops (December 2000)

ExperTune's new Loop Summary Table finds the best PID settings to use for loops that behave differently with varying conditions.

Perform several tests on a loop and the table summarizes the results for you. For each test, the Loop Summary Table lists the tuning parameters, process model, model confidence, and relative response time for the loop. The table automatically highlights the most conservative and the average tuning values. The most conservative tuning values are useful in loops with varying conditions, e.g., temperature loops that heat up quicker than they cool down. They may be the only tuning values that are stable.

The Loop Summary Table saves the process model. So you can compare the process model today with the process model from a previous ExperTune test. This gives you a historical perspective, aiding in troubleshooting.

The relative response time calculation is unique to ExperTune. It is a measure of the time the loop takes to correct a disturbance. Use it to decouple interacting loops. Faster loops should be tuned to have an RRT at least 3 times smaller than slower loops. You can then be sure that the faster loop will correct a disturbance before it has much effect on the slower loop.

ExperTune's full suite of optimization tools make it easy to increase the efficiency of your process. Use ExperTune software to analyze and tune PID loops in any industrial controller. ExperTune includes powerful simulation, modeling, robustness, linearization, valve wear analysis, pH linearizer, time series analysis, multi-variable, statistical and frequency response tools. ExperTune creates a full report of the analysis in Microsoft Word.

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Reduce Valve Stiction for Better Control (November 2000)

A control loop fighting a sticky valve will often push the loop into a cycle. The cycle can permeate through an entire plant causing havoc and off-spec product.

A new version of ExperTune's PID Loop Analyzer includes a stiction check wizard. The wizard provides a simple way of measuring the stiction in the control loop. ExperTune's wizard works on the installed valve, giving a true measure of the in-service valve stiction. Measuring the in-service stiction is much more significant than measuring it when the valve is not in use.

If the measured stiction is larger than 1%, then repairing the valve can result in much better performance and increased product quality. Reducing stiction may eliminate a troublesome cycle, resulting in product made closer to specification with less energy.

Checking a valve for stiction is the third of 5 steps to completely optimize the loop. The complete optimization steps are:

  1. Statistical analysis and diagnosis from normal operating data.
  2. Power Spectral Density analysis to check for hidden cycles.
  3. Check and correct valve problems: stiction, hysteresis and sizing.
  4. Test for and characterize non-linearities. Apply a characterizer to linearize the loop.
  5. Find optimal PID Tuning parameters.

ExperTune includes all the tools needed to make completing the optimization steps simple. ExperTune creates a full loop report including stiction analysis in Microsoft Word.

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Source Code for Industrial PID Algorithm (October 2000)

ExperTune, the leading supplier of PID Loop Tuning and optimization tools, has now made available the source code for an industrial PID control algorithm.

The ExperTune algorithm incorporates industrially hardened technology similar to that used within the major DCS systems. The algorithm has robust anti-reset-windup, solid initialization, bumpless transfer, and full alarming and over-ranging. A PV filter is automatically applied to the derivative action to reduce controller output jitteriness.

Separate C, C++, OCX code modules are included. Use the modules in:

* Embedded micro-controllers (C code)
* NT and Unix based systems and some micro-controllers (C++ code)
* NT or Windows 2000 based systems (OCX)

Users have a royalty-free license for redistributing the object code within their system.

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New Software Optimizes The Three S's In Plants: Startups, Switchovers, and Steady State (September 2000)

Operation startups, product switchovers, and steady state operation usually require different PID control system parameters. Most systems are optimized for setpoint changes: switchovers, and start-ups. But the loop performs poorly during steady state operation. Not any more - ExperTune's new software optimizes your plant for all of these scenarios.

ExperTune's solution is a setpoint filter combined with optimal tuning for steady state operation. The result is smooth setpoint response in combination with best response to process upsets. The setpoint filter is active only during setpoint changes. This allows the user to select ExperTune's optimal tuning for process upsets. With these PID settings in place, the feedback control loop is tightened to its utmost, giving excellent steady state optimization.

The setpoint filter ensures the loop also reacts well to plant startups and switchovers. You can use ExperTune to view the effects of the setpoint filter off-line in simulation before applying it to the process. Adjust the filter amount and immediately see the effect on the closed loop response. Taylor the response to exactly what your plant needs.

ExperTune creates a report of the entire loop optimization, including all the analysis graphs, performance indices, loop diagnosis and the setpoint filter in a Microsoft Word document. The report documents your loop for future records.

ExperTune's full suite of optimization tools make it easy to increase the efficiency of your process. Use ExperTune software to analyze and tune PID loops in any industrial controller. ExperTune includes powerful simulation, modeling, robustness, linearization, valve wear analysis, pH linearizer, time series analysis, multivariable, statistical, frequency response and loop tuning tools.

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Shrink-Swell Processes - New Optimization Software

The new version of ExperTune optimizes processes with shrink-swell characteristics. These shrink-swell processes are also called inverse response since, when the controller output changes, the level initially moves in the opposite direction to where it will end up.

ExperTune now makes these particularly challenging processes easy to model, tune and optimize. Using data collected from one setpoint change, ExperTune finds the optimal PID tuning parameters and model for the loop. The model consists of a lead time, lag time, integration and dead time.

ExperTune makes drum level control as easy as working with your less challenging loops. Just like any other loop, use ExperTune's full suite of tools for analysis and optimization: powerful simulation, modeling, robustness, frequency and valve wear analysis graphs of your plant loop, simply by clicking "Analysis".

The ExperTune simulation shows the performance improvements of your loop during setpoint changes and load disturbances. The unique ExperTune Robustness plot shows how sensitive the loop is to gain and dead time changes. Combining these simulation plots allows you to see the best tradeoff between tuning and stability before you download tuning.

Only ExperTune finds the fourth tuning parameter: PV Filter. The correct PV Filter value ensures no degradation of performance while reducing output noise and hence valve wear. An incorrect PV Filter value can seriously degrade control loop performance.

For your records, ExperTune produces a hard copy of your loop analysis in a Microsoft Word document. This report includes all analysis graphs, tuning parameters together with the resulting Performance Increase, Robustness Increase and Valve Wear indices.

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NEW! Free Demo CD Of PID Analysis Software (June 2000)

Demo CD makes it easy to preview the powerful PID analysis tools in ExperTune's software.

ExperTune creates award winning software that makes it easy to analyze and tune PID loops in ANY industrial controller. ExperTune Inc is the acknowledged leader in PID Analysis tools.

ExperTune's full suite of optimization tools make it easy to increase the efficiency of your process. Use ExperTune software to analyze and tune PID loops in any industrial controller. ExperTune includes powerful simulation, modeling, robustness, linearization, valve wear analysis, pH linearizer, time series analysis, multivariable, statistical and frequency response tools.

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FREE OPC Test Software (June 2000)

Testing your OPC connection is now as easy as downloading a file from ExperTune's web site.

Use ExperTune's free program on your desktop to monitor key process values. The program acts as an OPC Client and verifies that both local and remote OPC Servers are working correctly.

OPC (OLE for Process Control) is the new standard set by the OPC Foundation for fast and easy connections to controllers.

ExperTune software supports connecting to ANY industrial controller via OPC with the appropriate OPC server.

ExperTune's full suite of optimization tools make it easy to reduce the variability of your process. Use ExperTune software to analyze and tune PID loops in any industrial controller. ExperTune includes powerful simulation, modeling, robustness, linearization, and frequency response tools.

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Software Decouples Interacting Loops

New version of ExperTune software shows how to decouple interacting loops. ExperTune tunes the interacting loops without cycling to respond as fast as the coupled process allows.

ExperTune's Relative Response Time or RRT is the key to the new method. Simply adjust the safety factor so the Relative Response Time of each loop is separated by a factor of 3.

In single or multiple level deep cascade loops the RRT lets you check each successive outer loop to be sure it is set correctly.

Other multi-variable analysis tools in ExperTune are correlation analysis to see if one loop is effecting another and power spectral density analysis to pinpoint the location of process cycling.

ExperTune's full suite of optimization tools make it easy to reduce the variability of your process. Use ExperTune software to analyze and tune PID loops in any industrial controller. ExperTune includes powerful simulation, modeling, robustness, linearization, and frequency response tools.

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FREE Training CD - Five Steps to Optimize Control Loops

Badly performing process control loops reduce plant profitability. This free CD from ExperTune teaches how to diagnose and fix the problems on your badly performing loops.

Roughly 75% of process control loops cause more variability running in automatic mode than in manual. A third of them oscillate because of non-linearities: hysteresis, stiction, dead band, non-linear process gain. Another third oscillate because of poor controller tuning, and the remaining loops due too poor design. When a control loop is running optimally, variability is minimized. The plant can operate closer to specifications, maximizing production and profitability.

The training has been created by TOP Control, ExperTune's official trainer and service provider. They have years of experience in solving process control problems. Now they've put their knowledge into a free training CD and a series of in depth articles on optimizing process loops.

The CD uses a case study of a typical loop. It explains and demonstrates the basic steps to analyze and tune the control loop.

ExperTune is the world's leading supplier of software tools for analyzing and tuning PID control loops.

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To receive the CD Call +1 (262) 369 7711. Or email sales@expertune.com

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Universal pH Linearizer (January 2000)

ExperTune's new software provides linearization for any pH loop resulting in pH control with little or no cycling. Better pH control improves product quality, reduces reagent costs and helps to keep pH within regulation limits.

pH loops are inherently non-linear and cycle around the setpoint. ExperTune calculates the characterizer that should be applied to both the measurement and set point of the pH loop. The linearized pH measurement can then be accurately controlled by a traditional PID controller.

The ExperTune pH Linearizer uses titration data you enter. It plots a pH curve and converts the curve into the characterizer that is applied to the pH loop. For easy application of the characterizer within your controller, X-Y coordinates, BASIC, FORTRAN, or C code, are all automatically generated.

Co-designed by Greg Shinskey.

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Call +1 (262) 369 7711 for more information. Or email sales@expertune.com

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