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  Kssadmd.asdssaw Building and Industrial Automation 1. Analog  - Also spelled analogue , describes a device or system that represents changing values as continuously variable physical quantities. A typical analog device is a clock in which the hands move continuously around the face. Such a clock is capable of indicating every possible time of day. In contrast, a digital clock is capable of representing only a finite number of times (every tenth of a second, for example). 2 . Automatic Control System  - An automatic control system is a preset closed-loop control system that requires no operator action. This assumes the process remains in the normal range for the control system. Automatic control system has two process variables associated with it: a controlled variable and a manipulated variable. 3. Compensation Control - The addition of a transfer function in the forward path or feedback path for the purpose of improving the transient or steady-state performance of a control system. 4. Control Agent  - The medium or energy source, regulated by the controlled device which affects the value of the controlled variable. For example, a heating coil application: the discharge air temperature is the controlled variable, the valve is the controlled device, and the hot water is the control agent, or control medium. 5. Control Point  - the actual value of the controlled variable at any point in time. 6. Controlled Medium  - Simply a storage medium which contains all the instructions necessary to accomplish a desired manufacturing operation. 7. Controlled Variable  - The medium property which is being controlled by a control loop. For example, a heating coil application: the discharge air temperature is the controlled variable, the valve is the controlled device, and the hot water is the control agent, or control medium. 8.  Controller  - a controller is a device, historically using mechanical, hydraulic, pneumatic or electronic techniques often in combination, but more recently in the form of a microprocessor or computer, which monitors and physically alters the operating conditions of a given dynamical system. 9. Corrective Action    –  a process in control system which adjusts or manipulates the signal to achieve the desired output. 10. Cycle    –  A completed steps or logical processes in control system associated with loops and feedback. 11. Cycling    –  The repetition of completed steps completed steps or logical processes in control system associated with loops and feedback. 12. Cycling Rate  - A periodic change of the controlled variable from one value to another in an automatic control system per period of time. 13. Dead Band    –  is an interval of a signal domain or band where no action occurs. Dead band is used in voltage regulators and other controllers. The purpose is common, to prevent oscillation or repeated activation-deactivation cycles. 14. Deviation    –  an act or instance of diverging from an established way or in a new direction. 15. Directional Digital Control    –  is the automated control of a condition or process by a digital device (computer). 16. Digital Control    –  is a branch of  control theory that uses digital computers to act as system controllers. 17. Droop    –  The deviation from a preset value of a controlled liquid level, temperature, variable pressure, or differential pressure (at minimum controllable flow) when the flow through a regulator is gradually increased from its minimum controllable flow to its rated capacity.  18. Enhanced Proportional Integral Derivative Control    –  are used for process control  –  which includes the automatic control of systems such as temperature, flow rate, pressure, and speed. 19. Final Control Element    –  Final control elements are devices driven by a controller and are located in process lines. Final control elements change the operating conditions of the process and require energy to operate against the process pressure. 20. Lag    –  is a common word meaning to fail to keep up or to fall behind. In real-time applications, the term is used when the application fails to respond in a timely fashion to inputs. 21. Manipulated Variable    –  is independent variable that is manipulated to achieve a particular effect or tested to determine if it is the cause of the effect. 22. Measured Variable    –  A factor affecting the outcome of a process that is measured as part of a Six Sigma project or other process improvement initiative. Measured variables may include process inputs such as raw materials, or the time taken to complete a given step in a process, or other parameters of the process to identify opportunities for defects or areas for improvement.   23. Microprocessor- Based Control    –  system has been developed and used to provide satisfactory control of a pneumatic servo system. 24. Modulating    –  to regulate by or adjust to a certain measure or proportion. 25. OFFSET    –  an abrupt change in the dimension or profile of an object or the part set off by such change. 26. Pneumatic Control    –  is the use of  air as a control medium, or as the controlled medium, in which one medium controls the flow of another. 27. Process    –  a series of actions or steps taken in order to achieve a particular end. 28. Proportional Band    –  is often used instead of the controller gain. The value is expressed in percent (%). 29. Proportional Control    –  system is a type of linear feedback control system and more complex than an on-off control system like a bi-metallic domestic thermostat, but simpler than a proportional- integral-derivative (PID) control system used in something like an automobile cruise control.  30. Proportional Integral    –  The combination of proportional and integral terms is important to increase the speed of the response and also to eliminate the steady state error. 31. Proportional Integral Derivative Control    –  is a control loop feedback mechanism(controller) widely used in industrial control systems. A PID controller calculates an error   value as the difference between a measured process variable and a desired set point. The controller attempts to minimize the error   by adjusting the process through use of a manipulated variable. 32. Sensing Element - any device that receives a signal or stimulus (as heat or pressure or light or motion etc.) and responds to it in a distinctive manner. 33. Set Point - the desired value in a closed-loop feedback system, as in regulation of temperature or pressure. It is the desired or target value for an essential variable of a system, often used to describe a standard configuration or norm for the system. Departure of a variable from its set point is one basis for error-controlled regulation, that is, the use of  feedback to return the system to its norm, as in homeostasis. The target value that an automatic control system, for example PID controller, will aim to reach. 34. Step Control - The step response of a system in a given initial state consists of the time evolution ofits outputs when its control inputs are Heaviside step functions. In Electronics engineering and control theory, step response is the time behavior of the outputs of a general system when its inputs change  from zero to one in a very short time. The concept can be extended to the abstract mathematical notion of a dynamical system using an evolution parameter.  35. Zoning - Any continuous tract or area that differs in some respect, or is distinguished for some purpose, from adjoining tracts or areas, or within which certain distinctive circumstances exist or are established. To divide into zones, tracts, areas, etc., as according to existing characteristics or as distinguished for some purpose.


Jul 24, 2017


Jul 24, 2017
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