How To Overcome the Headaches of PID

Posted by Sharon Fay on Jun 18, 2015, 10:02:00 AM

Find me on:

How_To_Overcome_the_Headaches_of_PID

A PID Control measures proportional, integral, and derivative error in control systems.  However, because the system is so complex it needs extensive expertise and time to control.  Learn how one company overcame the headaches of PID with LineStream Technologies.

The Process

PID_pic

Plastic Hose Extrusion. Plastic extrusion converts plastic pellets into a tube or hose by melting the pellets and forcing them through an extruder.  The end product is cooled, drawn away from the extruder at a constant rate, and wound onto a spool so that it can be used in other processes.  

The Control Challenge

Temperature control is critical, and a consistent temperature must be maintained across the process.  If too much heat is applied, the plastic granules can decompose, or the melted material becomes too fluid.  If too cold, the pellets won’t melt properly. Temperature variation must also be controlled to ensure that the hose is extruded at a constant rate. Inconsistent temperature results in an inconsistent end product.

Pain Point

PID control = +/-8 degree temperature variation

A leading manufacturer of nylon hose tried to use the PID control block in their PLC to maintain constant temperature across the process.  However, they found that PID could only constrain the temperature to +/- 8 degrees.

Solution

Active Disturbance Rejection Control (ADRC) compensates for temperature variations

Ultimately, they replaced the PID controller with the InTAC control block control provided by LineStream Technologies.  InTAC is based on Active Disturbance Rejection Control (ADRC), which automatically compensates for temperature fluctuations, as well as other variations in the process.  With InTAC, the temperature variation was reduced to +/-2 degrees.

InTAC is available for SIEMENS PLCs. Contact ACD today to get your free evaluation copy.  

Contact ACD

 

 

 

Find out more about overcoming the headaches of PID 

 

You may also be interested in reading:

Topics: PID

ACD Connect

About the Blog

Welcome to ACD Connect! We will be bringing you the latest industry news in Industrial Automation, features on new products and manufacturers, helpful Engineering tips and how-to's, as well as exciting company updates. ACD Connect is where to go to read about the industry's newest technologies. 

Subscribe to ACD Connect!

Recent Posts