LABVIEW SOLUTIONS BOARDSERVER
 Subject: PID HELP on Control Design and Simulation
 
Author: Marco Almeida
Date:   5/6/2014 4:43 am EDT
Hello
Im new on LabView and I have a problem on my VI project. I was wodering if anyone can help me to solve my problem.

I have 2 Vi's: one with a room modeling and one with 2 heat exchangers (1 cooling and 1 heating) that has 12 actuator each running from 0 to 100% to control room temperature.

My PID is working but not has I expected. It is sending me the correct output, but send the output realy fast. I need something slow to control those actuators.

Problem: Lets supose that I have 25ºC on the room and I want it at 20ºC. My PID will give 100% of cooling, but I want that the PID send an output slowly passing from 1%...2%...3%, and so on until it reach the desire percentage (100%).

Because if it gave me 100%, the actuator will go instantly to full position and the romm temperature will decrese instantly for, lets say, 10ºC, then it will need to heat, so the heat exchanger will do the same: PID will give 100% to the actuator and the room tempertature will go to 25ºC, and then cooling, going to 10ºC, and then heating again going to 25ºC.

If the PID gave me that slow percentage, the room certenly will reach 20ºC and the heat exchenger will never reach 100%.

Hope you can undertand my situation.
Thanks in andvance.

Best Regards
Reply To This Message

 Topics Author  Date      
 PID HELP on Control Design and Simulation    
Marco Almeida 5/6/2014 4:43 am EDT
 Reply To This Message
 Your Name:  
 Your Email:  
 Subject:  
  Submission Validation Question: What is 41 + 23? *  
* indicates required field