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problem 1

Ziegler-Nichols Open Loop Tuning   
Often, when working with a faster loop, many people will opt only for a PI control philosophy.  Looking at the following graph, find out PI parameters the you would use (bearing in mind that one often has to fine tune, slightly, afterwards, just to ensure you get the results you want).

1585_Loop tuning.jpg
Hints you might find useful:

The horizontal divisions (left to right) are 10 second intervals.

The vertical divisions (top to bottom) are in 10% intervals.

At the start of the test, the controller output (blue pen) was at 50%.

At the start of the test, the process variable (purple pen) was at 60%.

problem 2

Ziegler-Nichols Closed Loop Tuning

Often, when working with a slower loop, many people will opt for a full PID control philosophy.  Looking at the following graph, find out PID parameters the you would use (bearing in mind that one often has to fine tune, slightly, afterwards, just to ensure you get the results you want).

2180_Loop tuning_1.jpg

Hints you might find useful:

The horizontal divisions (left to right) are 10 second intervals.

The vertical divisions (top to bottom) are in 10% intervals.

The gain used, to get constant oscillations, was 3.5

Electrical & Electronics, Engineering

  • Category:- Electrical & Electronics
  • Reference No.:- M91513

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