Controller faceplates

Faceplate controller Controller having multiple switching contacts mounted near a selector arm on the front of an insulated plate. Additional resistors are mounted on the rear to form a complete unit. 

The microphone is positioned near the top of the hearing-aid faceplate above the battery compartment, and the volume control and the vent are at the bottom. This... 

Double-clicking the controller icon opens a controller faceplate, as shown in Figure 3.66. The controller faceplate is where all the features of the controller can be examined and adjusted. There are seven buttons at the top. The first one from the left puts the controller in automatic. The second puts the controller on manual. The setpoint (SP), process variable (PV), and controller output (OP) signals are displayed in the bottom three bar charts, with numerical values given in the boxes. 

The value of deadtime is set by clicking on the icon, clicking the right mouse button, and selecting Forms and All Variables. The window shown at the top of Figure 3.75 opens, which shows some default values for input and output. Make an initialization run to get the correct values, as shown in at the bottom of Figure 3.75. The deadtime value has also been inserted. Figure 3.76 shows the flowsheet and faceplate with the temperature and level controllers installed. 

A flow controller is installed on the feedstream to the reactor. Figure 6.49 shows that the action is reverse and the typical flow controller tuning constants are used (Kc = 0.5 and Tj = 0.3 min). Figure 6.50 shows the final flowsheet, the three controller faceplates, and the steady-state temperature profile. The setpoint of the peak temperature controller is 441 K, and the coolant temperature is 400 K. 

Control Modules Model Generic Defines the generic types of control modules, their functionality, alarm attributes, and faceplate displays... 

In external centerless grinding, the workpiece lies between grinding wheel, workrest plate, and control wheel which regulates the speed of the workpiece. In internal centerless grinding, the workpiece lies between rolls or shoes and is driven by a control wheel or a faceplate. 

The faceplate is located at some convenient spot in the window where we can keep an eye on what is going on with this level loop. Remember there will eventually be five controller faceplates. 

Figure 7.15 (a) Initial controller faceplate and initialize, (b) Proportional level control tuning. 

Relay-Feedback Test. Everything is ready for the relay-feedback test. Clicking the Tune button on the far right at the top of the controller faceplates (see Fig. 7.25) opens the window shown in Figure 7.26a. We specify a Closed loop ATV as... 

To start the test, click the Run button at the top of the screen and click the Start test button on the Tune window. To be able to see the dynamic responses, click the Plot button at the top of the controller faceplate. 

The flowsheet and controller faceplates are shown in Figure 7.29a and b. We will compare the performance of this control structure with some alternatives later in this chapter. First we want to illustrate the use of a composition controller. 

Figure 8.5a shows the plant-wide control structure for both columns. The first two summer blocks add the three-stage temperatures. The multiplier block average multiplies by 0.3333. The last summer block adds the constant 273 to convert the signals back to K from the metric units (°C) used in Aspen Dynamics. The average temperature is 429 K, which is the set point of the TC2 controller shown on the faceplates in Figure 8.5b. Note that the solvent flow controller is on cascade because the solvent flow rate is ratioed to the flow rate of the fresh feed.

Figure 8.5 (a) Extractive distillation control structure, (b) Controller faceplates. 

Figure 8.17b shows the controller faceplates. Notice that the flow controller on the vapor distillate (FCD) has a remote set point (on cascade ) coming from a multiplier ( ratio ) whose two inputs are the reflux flow rate and the CCxD controller output signal. The temperature controller is also on cascade with its set point coming from the CCxB controller. 

---