subject: Controllers And Drives [print this page] Digital controlleris used in digital computers to act as system controllers. This is usually cascaded with a plant in the feedback system and rest of the system can be either digital or analog. Digital power controls sophisticated configuration and diagnostics capabilities not found in switching regulators. Many controllers which are available in the present day are analog, which provide high performances but cannot be digitally configured. Digital controllers which are available in the market consist of fully digital topologies, which require high speed data converters and power.
Process controller
Process Controller deals with architectures, mechanisms and algorithms. This is mainly used in statistics and engineering discipline. Process controller maintains the output of specific process within a desired range. There are different types of control systems and process control is one among them. This is extensively used in industries which help in bulk production of any continuous process like oil extraction, oil refining, paper manufacture, chemicals, power plants and many other industries. Any controller is generally built on the control principles like proportional controller, integral controller and derivative ontroller.
Digital temperature controller
Digital temperature controllers are used for general purposes, which meet wide range of application needed for food manufacturing, storing, packing, extraction etc., these need very high speed, high performance, easy setting and easy to read displays. Temperature controllers are available in different specifications. They are structurally stable, easy to install, accurate and operate. These are made up of high quality products. In these types there will comparison between actual and desired temperatures.
VFD drive
VFD drive is nothing but Variable Frequency Drive. VFD is necessary for controlling the rotation speed of an AC. In VFD the rotation speed can be adjusted according to the requirement. These are also known as adjustable frequency drives (AFD) or Variable speed drives (VSD) or even inverter drives. These VFD are used in wide range of applications like in pipes, fans, pumps other machineries.VFD can offer potential energy savings in a system in which loads vary with time. The performance speed of a motor connected to a VFD is varied by changing the frequency of the motor supply voltage and allows continuous speed process. These are often designed in such a way that they can hold the peak load with safety.
VVFD Drive
Variable voltage frequency drive is that when speed is controlled by varying frequency. These are mainly designed to control the speed or to maintain the same rotation or speed even during the voltage fluctuation. These are the good units which help to lower the consumption of power.
