VSDs (Variable Speed Drives) offer several benefits, some of which are relatively easy to quantify, and others of which are less tangible, but there are some potential drawbacks, which must… Read more
Apr 03, 2013 | Edvard
A common PLC application is the speed control of AC motors with variable speed (VS) drives. The diagram in Figure 1 shows an operator station used to manually control a… Read more
Dec 29, 2012 | Edvard
Terms below are the basic mechanical terms associated with the mechanics of DC drive operation. Many of these terms are familiar to us in some other context. Force Net Force… Read more
Dec 06, 2012 | Edvard
The most common use of frequency converters is to drive sludge pumps, elevators, conveyers, aeration, chemical dosing, clarifiers, digesters, presses and centrifugal dewatering. In the beginning water is being pumped… Read more
Nov 22, 2012 | MarkoCvrkota
Since the late 1960’s, frequency converters have undergone extremely rapid changes, largely as a result of the development of microprocessor and semi-conductor technologies and their reduction in prices. However, the basic principles of… Read more
Nov 21, 2012 | Edvard
Selecting of a frequency converter for variable speed drives requires a lot of experience. If the experience is not available, it is often useful to visit either a reference plant with similar… Read more
Nov 17, 2012 | Edvard
Consider the application of a drive to a cane milling unit where the speed is to be variable from full to half rated speed. The drive is to be capable… Read more
Sep 11, 2012 | sprabakar22
In modern plants, there are number of drives like Milling Plant Drive, Hydraulic Drive, DC Motor Drive and AC Motor Drive of adequate capacities are available. There is lot of… Read more
Sep 10, 2012 | sprabakar22
The simplest and least expensive way to control the speed of a process or piece of equipment is to operate all the equipment at full speed. Many applications require the… Read more
Jul 19, 2012 | Edvard
An induction motor connected directly to the power supply draws a constant magnetizing current at full speed, no matter what the load is. At anything less than full load, power… Read more
Jun 16, 2012 | Edvard
