Controls - The Building Blocks to Automation

Written by Thomas Yoon


Continued from page 1

Machines are made to replace humans in most control systems today.

The basic feature of any control system consists of 4 elements. These arerepparttar measuring element,repparttar 133417 controlling element,repparttar 133418 set value, andrepparttar 133419 correcting element.

The measuring element provides a means of detection/measurement ofrepparttar 133420 conditions required. This isrepparttar 133421 "eyes" or "ears" (or other senses) ofrepparttar 133422 system.

The controlling element isrepparttar 133423 place where allrepparttar 133424 decisions on what actions to take are being made. It can be consideredrepparttar 133425 "brains" ofrepparttar 133426 system. It must make decisions based on certain guidelines or values required. The set values are inputted into repparttar 133427 system by humans.

The correcting element is whererepparttar 133428 correction torepparttar 133429 process is done. It can be considered likerepparttar 133430 "hands" or "feet" ofrepparttar 133431 system. It must take certain physical actions to bringrepparttar 133432 processes back torepparttar 133433 set value.

Well folks, be in control!

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Many years of working experience in Marine, Facilities, Construction has given the author material for writing e-books and articles related to engineering, and management. Subscribe to facworld ezine More information at Marine and M & E


Transducers - The Remarkable Changers

Written by Thomas Yoon


Continued from page 1

How do these transducers work?

To convert physical movement to electrical signals, some devices make use of variable resistors. Any movement will cause a slider contact to change position against a resistance wire causing a change in electrical current or voltage. Other devices may make use ofrepparttar movement to alterrepparttar 133416 position of an induction coil relative torepparttar 133417 magnetic core, causing a change inrepparttar 133418 induced current inrepparttar 133419 circuit. Others may make use ofrepparttar 133420 movement to changerepparttar 133421 air gap between two capacitance plates, causing a change inrepparttar 133422 current inrepparttar 133423 circuit.

Inrepparttar 133424 case ofrepparttar 133425 loudspeaker,repparttar 133426 opposite effect takes place. Electrical signals are converted to movement.

Some pneumatic transducers make use of changing air signals to cause a corresponding mechanical movement inrepparttar 133427 flapper and linkages. This movement is then converted to electrical signals byrepparttar 133428 methods above. So it takes 3 steps of conversion before we can getrepparttar 133429 electrical signal.

Oncerepparttar 133430 electrical signal is obtained, it can be used to compare torepparttar 133431 set value inrepparttar 133432 controller, and a whole control system can be designed from it.

Well folks, get your signals and be in control!

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