Controller Faceplates and Parameters

The action (direct or reverse) of the controller must be specified. The level controller should open the valve when the level increases, so direct action is selected. The controller tuning constants are initialized as default values of Gain (Kc =1) and Integral time (tj = 20 min). As we will discuss later in this chapter, most level controllers should use 

QQ(S -FUSH P U0M 3 M.OCKSrnASH ltev l U0M 4 SlflC MSrV ).P U0M 5 5fflEAMSri. FIU0M 

The plotting capability in Aspen Dynamics is fairly limited, so it is often convenient to copy all the dynamic information shown in the strip-chart plots and use a more flexible plotting software. For example, the data from Aspen Dynamics can be loaded into Matlab and multiple plots can be generated in whatever form you want. To get a file of the data in Aspen Dynamics, right click the plot and select Show as History. A window opens that contains a table of all the variables, including time in the first column, which can be copied. Many examples of these kinds of plots are presented in subsequent chapters. 

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