Category: Analyzers Operator Interface Operator Effectiveness Operator Training Feedforward Control Ratio Control Tips
Submitted by Greg McMillan on Sat, 05/30/2015 - 14:47
All feedforward control systems can be reduced to a common form that enables a better understanding and recognition that leads to the best performance and the best interface for the operator. For “smart controls” to be fully appreciated and utilized, the operator needs to know what is going on and...
Category: Advanced Regulatory Control Adaptive Control External Reset Feedback Feedforward Control Model Predictive Control PID Controllers PID Structure Tips
Submitted by Greg McMillan on Sun, 03/29/2015 - 14:36
The power of the PID largely remains untapped. I have recently documented the extensive capability of the PID but being a realist, I expect MPC is going to take over more and more of the role of the PID.
Category: External Reset Feedback Dead Time Enhanced PID Feedforward Control Valve Position Control Tips
Submitted by Greg McMillan on Fri, 04/18/2014 - 16:59
The power of the PID largely remains underutilized. Most of the options and parameters other than scale ranges and tuning settings remain at their defaults. Here we look how to tap into the incredible capability of the PID to minimize batch cycle time and start-up time and to maximize production...
Category: Deadtime Compensator Feedforward Control PID Options Override Control Valve Position Control Tips Enhanced PID External Reset Feedback Open Loop Backup
Submitted by Greg McMillan on Fri, 04/04/2014 - 12:23
Advanced regulatory control seeks to incorporate knowledge of process dynamics, disturbances, constraints, and objectives to increase process efficiency and capacity. The PID power and flexibility enables an incredible spectrum of creative opportunities to achieve these goals.
Submitted by Greg McMillan on Fri, 10/18/2013 - 11:37
If there were no unmeasured disturbances, feedback control would not be necessary. Process engineers and operators could home in on the best PID output and just leave it at this value. In fact many process engineers are much more comfortable with setting a stream flow per a process flow diagram...
Submitted by Greg McMillan on Wed, 10/09/2013 - 17:45
Much of the differences in approaches to controller algorithms and tuning can be traced back to assumptions made about the type and importance of disturbances. Each method has merits based on the disturbance frequency, location, and time lag.
Submitted by Greg McMillan on Thu, 05/09/2013 - 16:30
A unified approach to tuning has been found that enables a common and simplified method for setting PID tuning parameters. Key features can be used to eliminate the need for retuning to deal with different dynamics and objectives.