Industrial Automation
Benefits and Potential Drawbacks of VSDs
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 | By Edvard Csanyi
Electric Motor
Direct Starting Of Squirrel-Cage Induction Motors
The direct starting (Direct On Line, DOL) is the simplest and most cost-efficient method of starting a motor. This is assuming that the power supply can easily deliver the high starting… Read more
Feb 16, 2013 | By Edvard Csanyi
Electric Motor
PLC Application For Speed Control of AC Motors With Variable Speed (VS) Drive
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 | By Edvard Csanyi
Industrial Automation
SCADA As The Heart Of a Distribution Management System
At a high level, the elements of a distribution automation system can be divided into three main areas: SCADA application and server(s) DMS applications and server(s) Trouble management applications and… Read more
Dec 25, 2012 | By Edvard Csanyi
Industrial Automation
Basic Mechanical Terms Used In Drives Applications
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 | By Edvard Csanyi
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… 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… Read more
Nov 17, 2012 | By Edvard Csanyi
Electric Motor
Motors for Hazardous Areas
Electrical drives/motors that are operated in hazardous areas must be built and engineered so that they cannot become an ignition source. This applies not only to normal operating and starting, but also… Read more
Nov 02, 2012 | By Edvard Csanyi
Electric Motor
Industrial Applications of Brushless Servomotor
A synchronous machine with permanent magnets on the rotor is the heart of the modern brushless servomotor drive. The motor stays in synchronism with the frequency of supply, though there… Read more
Oct 26, 2012 | By Edvard Csanyi
Industrial Automation
Basic steps in PLC programming for beginners
The first step in developing a control program is the definition of the control task. The control task specifies what needs to be done and is defined by those who… Read more
Oct 04, 2012 | By Edvard Csanyi
Electric Motor
Thermal (Overload) Motor Relay Protection
The majority of winding failures in motor are either indirectly or directly caused by overloading (either prolonged or cyclic), operation on unbalanced supply voltage, or single phasing, which all lead… Read more
Jul 14, 2012 | By Edvard Csanyi
Electrical Lectures
DC Motor Drive Explained In Few Words
In a DC motor, the magnetic field is created by the current through the field winding in the stator. This field is always at right angles to the field created… Read more
Jun 23, 2012 | By Edvard Csanyi
Industrial Automation
Using MODBUS for Process Control and Automation (2)
To communicate with a slave device, the master sends a message containing: Device Address Function Code Data Error Check Continued from first part of article Using MODBUS for Process Control… Read more
May 31, 2012 | By Edvard Csanyi
Industrial Automation
Using MODBUS for Process Control and Automation (1)
MODBUS is the most popular industrial protocol being used today, for good reasons. It is simple, inexpensive, universal and easy to use. Even though MODBUS has been around since the… Read more
May 21, 2012 | By Edvard Csanyi
Energy and Power
Time relays setting ranges explained in details
Time relays are used in control switching operations involving time delay. Most of these time relays have multiple time setting ranges and most of them are explained below. Time relays… Read more
Apr 30, 2012 | By Edvard Csanyi
