Lecture+22.++Process+Control

Lecture+22.++Process+Control - UNIVERSITY OF CALIFORNIA...

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UNIVERSITY OF CALIFORNIA Department of Viticulture and Enology VEN 135 WINE TECHNOLOGY AND WINERY SYSTEMS 22. WINERY PROCESS CONTROL AND INFORMATION MANAGEMENT SYSTEMS In the general field of process control and information management, there are really three types of systems that are in use in industry. These are process control systems, data acquisition systems, and data management systems. For systems that are commercially available, there may be some functional overlap that blurs this distinction (i.e. some process control systems may also acquire and save data). However, for the purpose of this discussion, these three types of systems will be discussed separately. PROCESS CONTROL SYSTEMS A process control system is a system used to control the action of equipment within some predetermined guidelines or setpoints. Examples of this control would be temperature control on a fermentor, flow rate control on a pumping system, or fill level control on a bottling machine. In general, for any control system (or individual “loop”), there must be a signal coming from a sensor, a setpoint with which to compare it, a manipulated variable that can be used to return the value to the set point, and a controller to compare the actual value with the setpoint and manipulate the manipulated value. Using the temperature control example, the sensor would be some sort of temperature sensor (e.g. a thermocouple or RTD), the setpoint would be the desired tank temperature, and the manipulated variable with the position of a flow control valve that allows coolant into the jacket of the tank. There are four types of “signals” in a control system. These are analog input, analog output, digital input, and digital output. Analog means that the signal is a continuous value (e.g. temperature, pressure, pH, flow rate, etc.).
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This note was uploaded on 09/29/2010 for the course VEN 91866 taught by Professor Davidblock during the Spring '09 term at UC Davis.

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Lecture+22.++Process+Control - UNIVERSITY OF CALIFORNIA...

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