How to tune a cascade control-system?

Industrial Automation
1

To tune a cascade control-system the following procedure is suggested ?

1.Place both controllers in manual. 2.Adjust proportional and integral settings to conservative values (wide proportional band and long integral time) on the secondary controller 3.Place secondary controller in automatic and tune 4.Adjust the proportional integral and derivative settings on the primary controller to conservative starting values. 5.Place the primary controller in automatic and then tune.

Always tune the secondary controller first(with the primary controller in manual) and then the primary controller.

2

Hi Denizen,

Could you pls tell some explanation why we have to tune the Second one first?

Thanks,

3

Can u tell me How to Sensor outrim using a HART communicator,please?

4
  1. Start by setting both in manual with fixed CVs.
  2. Make manual step change in the inner loop.
  3. Put the data into https://pidtuner.com and tune inner loop tightly.
  4. Put inner loop un auto.
  5. Make manual step change in the outer loop.
  6. Put the data into https://pidtuner.com and tune outer loop according to specs.
  7. Put outer loop un auto.
  8. Profit.