[VIDEO] Get to know your Process Controller (PID)

Hello, in this video I want to show you the importance of knowing the process controller in the tuning of an industrial process.

It's important to understand the process controller; this might sound familiar to some, but it's crucial to emphasize it. Let's quickly review one part of a process: 

1. You need the instrument – (b) then the PID controller and finally (c) it will manipulate an actuator or control element. 

  Let's look now at the PID controller In the closed-loop diagram: The steps: 

1. To the Setpoint – (b) then to the controller – (c) actuate on a valve – (d) then the process – finally (e) feeds back to the beginning of the loop (to see if it has reached the setpoint).     

Let's look at the following:

 Proportional control:  What you need to know and keep in mind is: 

• Work immediately
• Gain value = ∆Output /∆Input  

Example:  

• If PV changes to 5%, and gain 2
• ⡪ Exit will change 10%

Comprehensive Control: What you need to know and keep in mind is: 

Accumulate the error, to reach a goal x

• Always look for the error to eliminate it.
• Ti (min/rep) = Input Error / Output Speed
• Ti (min/rep) = e / (dm/dt); Ki (rep/min) = (dm/dt)/e 

Example (Integral controller only):

• If e = 5%, and Ti = 0.5 min/rep (2 rep/min)
• → Output will change 2.5%

Derivative control: What you need to know and keep in mind is: 

• The prudent side of the controller withstands the aggressiveness of the controller

• Td = Displacement _ Output / Speed _ Input
• Td = ∆Output/ (de/dt) 

Example:

• If PV changes 5%/min, and Td= 4min
• ⡪ The exit will immediately change to 20%

I hope this video helps you better understand how to fine-tune an industrial process.