HI ALL, I HAVE A LOGO 8 TO IMPROVE A SYSTEM THAT A HAVE ON MY FACILITIES.

I HAVE 4 VACUM PUMPS THAT I NEED TO PUT IN AN AUTOMATIC SYSTEM BASED ON A LOGO.

BASICALLY I WANT TO APPLY A 4-20mA PRESSURE SENSOR (-1 to 0bar) to control the number of pumps to turn on.

That is, I define a set point in the logo and, depending on the existing pressure, the pumps will turn on until the set point is reached. how can I program it?

I explained poorly what I want. The objective is for the 4 vacuum pumps to turn on until the set point is reached, and after that, turn off the pumps and keep the necessary ones turned on to maintain the negative pressure defined in the set point.

What I want is to reach -500bar as quickly as possible, so that the 4 pumps turn on initially. After reaching the set point, they will turn off sequentially (4,3,2,1) but ensuring the minimum pressure of -500 mbar. For example, if pumps 1,2 and 3 are working, and the pressure goes from -530mbar to -490mbar, pump 4 will have to turn on to ensure the vacuum pressure.

turn off outputs Q4 - Q3 - Q2 - Q1 sequentially

Hello helder_pinho_84,

If I understand you correctly, the program should be able to help you. Of course, you have to adjust the values ​​and the sensor to your needs.

Best regards, Ella_68

Greetings. I hope my program concept to address your needs is part of what you need.

Hello Ella_68, thank you very much. You