- #1

David J

Gold Member

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- 15

## Homework Statement

Figure 5 shows the input and output wave forms for a proportional plus integral controller. State:

(i) the controllers proportional gain

(ii) the controllers integral action time

The attachment below is a copy and paste of the input and output wave forms I am given

## Homework Equations

[/B]

I use the equation ##gain = \frac{100}{\%PB}##

Integral action time is the time taken for the initial change due to proportional action to be repeated by the integral action when the input to the controller is subject to a step change

## The Attempt at a Solution

I[/B] am looking at where to start with this as all of my lessons show the output moving in a positive direction (up) so do I assume this is some kind of reverse acting device as the output is moving down as the input increases.

There are no values given on the y-axis so I do not know ranges etc. In a situation like this, if I input my own values would should I still be able to calculate the correct values? I am just looking for a little bit of info to initially start me off in the correct direction