Control Engineering - A guide for beginners - Chapter 5 pptx

... manipulating variable on the regulating valve. The actuating controller operates the ac- tuator via two switching outputs, and receives an actuator retransmission signal (usually a stan- dard signal 0/4 ... variable (y R ) of the continuous controller. A modulating controller does not receive an actuator retransmission signal and must always assu- me a linear actuator action. If the...

Ngày tải lên: 07/08/2014, 15:20

... Continuous controllers 50 JUMO, FAS 52 5, Edition 02.04 takes up a value such that the resulting manipulating variable is just sufficient to maintain the pro- cess variable at a constant value. A P controller ... manipulating variable slowly increased by hand, allowing adequate time after the change for the end temperature to be reached. A certain value of manipulating variable w...

Ngày tải lên: 07/08/2014, 15:20

... the manipulating variable MV. There are a number of ways to carry out this task: me- chanical, pneumatic, electrical, mathematical. The mechanical controller, for example, alters a sig- nal through ... the controller. This can be in the form of a digital dis- play (numerical indication), which has the advantage of being readable from a longer distance. The advantage of the analog di...

Ngày tải lên: 07/08/2014, 15:20

... T g Temperature small electrically-heated oven large electrically-heated furnace large gas-fired reheating furnace autoclave high-pressure autoclave injection molding machine extruder packaging machine ... variable after the dead time has elapsed. If the change in manipulating variable was too large, there is a time interval before this is noticed and acted on by reducing the manipulating...

Ngày tải lên: 07/08/2014, 15:20

... time, for mathematical analysis, the area of the control error is also used as a measure of control quality (see Fig. 46). Linear control area (linear optimum): [A] min = A 1 - A 2 + A 3 Magnitude ... distur- bances of the characteristics in a control loop normally has to be accepted as given, good control quality can only be achieved by a suitable choice of...

Ngày tải lên: 07/08/2014, 15:20

... transfer from automatic to manual mode, where the manipulating variable remains at its current value, and can then be changed manually. In case of a broken probe, caused, for example, by a cable ... control quality through special controls 102 JUMO, FAS 52 5, Edition 02.04 Against the advantages shown, there are also a number of disadvantages: - The dynamic control action is...

Ngày tải lên: 07/08/2014, 15:20

... such as temperature, pressure or voltage has to take up a specified value, and maintain it as accurately as possible. A simple example is a furnace whose temperature has to be maintained constant. ... variable after the dead time has elapsed. If the change in manipulating variable was too large, there is a time interval before this is noticed and acted on by reducing the manipulating...

Ngày tải lên: 13/12/2013, 00:14

... 70°, averaging about 55 °, azaleas, daisies, carnations, candytuft, alyssum, dusty miller, chrysanthemums, cinerarias, camellias, daphnes, geraniums, petunias, violets, primroses, and verbenas make ... You can hardly make a mistake in selecting, as all are interesting. Start this year with a few and gradually increase the number under your care year by year, and aim always to make your p...

Ngày tải lên: 02/07/2014, 05:20

... with a Gmail account. To create a Gmail address, go to http://mail.google.com. Gmail and Other Email If you like, Gmail can check other email addresses, and it can also forward email to another address. ... looks. The advantage of creating a website manually is the degree of customization you can have, and the disadvantage is the amount of work it can take to create and maintain, and th...

Ngày tải lên: 29/05/2014, 15:45

... and retrain people mean the need to teach and learn at a distance will escalate. Some of the main benefits of online learn- ing (a form of distance learning) are flexibility (people can learn at ... country and requiring learners to sit in a classroom for a set number of hours. • Improved control and standardization. In today’s interna- tional business climate, many organizations hav...

Ngày tải lên: 03/06/2014, 02:04