Variable Speed Drives
VLT Drives in Wastewater Treatment Plant Applications
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 into the plant from the collection basin. The frequency converter… Read more
Nov 22, 2012 | By MarkoCvrkota
Industrial Automation
Few Words About Frequency Converters
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 frequency converters remains the same. Frequency converters can be divided into… Read more
Nov 21, 2012 | By Edvard Csanyi
Industrial Automation
How to Select Right Frequency Converter for Variable Speed Drive (VSD)?
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 applications, or exhibitions or trade shows. The following is a… Read more
Nov 17, 2012 | By Edvard Csanyi
Electric Motor
LT / Medium / HT VFD Used In the Industry (part 2)
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 of producing full rated torque over the entire speed range…. Read more
Sep 11, 2012 | By sprabakar22
Electric Motor
LT / Medium / HT VFD Used In the Industry (1)
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 scope for improving the overall efficiency and saving the energy… Read more
Sep 10, 2012 | By sprabakar22
Electric Motor
AC Adjustable Speed Drive (ASD) – An Overview
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 speed of a process or piece of equipment to be… Read more
Jul 19, 2012 | By Edvard Csanyi
Electric Motor
Soft Starter In Industrial Applications
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 factor of the induction motor is less than its rated… Read more
Jun 16, 2012 | By Edvard Csanyi
Electric Motor
Advantages of Variable Speed Motors
Most motors are designed to operate at a constant speed and provide a constant output. While in many cases this may be more than adequate, it is not in all. Two-speed induction motors can improve efficiency for refrigerators, air conditioners,… Read more
Jun 13, 2012 | By Edvard Csanyi
Electric Motor
Why do we find electric motor drive very important?
Electric motors impact almost every aspect of modern living. Refrigerators, vacuum cleaners, air conditioners, fans, computer hard drives, automatic car windows, and multitudes of other appliances and devices all use electric motors to convert electrical energy into useful mechanical energy…. Read more
Feb 29, 2012 | By Edvard Csanyi
Electric Motor
Why do we need variable speed drives (VSD)?
There are many and diverse reasons for using variable speed drives. Some applications, such as paper making machines, cannot run without them while others, such as centrifugal pumps, can benefit from energy savings. In general, variable speed drives are used… Read more
Nov 25, 2011 | By Edvard Csanyi
Electric Motor
VSD – Power supply connections and earthing
In accordance with accepted practice and the local, power is normally provided to a VSD from a distribution board (DB) or a motor control center (MCC). Adequate arrangements should be made to provide safety isolation switches and short-circuit protection in… Read more
Apr 13, 2011 | By Edvard Csanyi
IEC Standards
EN61800-3 (IEC1800-3) – Adjustable speed electrical power drive systems
The countries of the European Economic Area (EEA) have agreed on common minimum regulatory requirements in order to ensure the free movement of products within the EEA. The CE marking indicates that the product works in conformity with the directives… Read more
Jan 14, 2011 | By Edvard Csanyi
Variable Speed Drives
The Best Applications For Variable Frequency Drives (VFDs)
Advances The most commonly used motor in building HVAC applications is the three-phase, induction motor, although some smaller applications may use a single-phase induction motor. VFDs can be applied to both. While VFD controllers can be used with a range… Read more
Sep 03, 2010 | By Edvard Csanyi
