Electric Motor
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MCC Circuit Featuring Auto Re-Closure Relay Functionality
An MCC circuit of a motor could be based on the Direct Online Starter (DOL) or Star Delta Starter which has something to do with the requirement of the power system in an industry. But it could have additional logics…...
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Apr 14, 2025 | By Umer Nasir
Energy and Power
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Three-phase basics and terms that students often mix
We all know that an electric current needs a circuit (a complete circle) before it can flow. A single-phase wye circuit can be a phase and a neutral with the current flowing through the “hot” wire and returning to the…...
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Feb 27, 2023 | By Edvard Csanyi
Electric Motor
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Guidelines for selecting the proper Variable Frequency Drive (VFD) for motor applications
This article addresses the Variable Frequency Drive (VFD) concept in several aspects that matter the most in selecting the proper VFD for applications. One of the important factors is the control type required for a given application since it is…...
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Jun 28, 2021 | By Salem Alshahrani
Electric Motor
Troubleshooting the most typical winding problems of three phase electric motors
It’s always important to identify the real cause of burned windings and not just to replace the electric motor. Motor windings have a different appearance in all these failure situations: single-phase burnout, overload, unbalanced voltage, and voltage spikes. Voltage spike… Read more
Dec 21, 2020 | By Edvard Csanyi
Industrial Automation
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Soft starter for potable water well pump (wiring diagram, troubleshooting example)
This article will analyze a real example of an electrical switchboard for a potable water well pump, containing a soft starter as one of the major components. Besides the explanation of the wiring diagram and working logic, some technical problems…...
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Dec 27, 2019 | By Miodrag Kokotovic
Electric Motor
Medium voltage soft starter for heavy-duty motor control (operation and special applications)
A soft starter is an electronic motor controller used on three phase medium voltage squirrel cage induction motors. During motor starting, the soft starter controls the voltage or current supplied to the motor. Motor start performance is optimized by reducing… Read more
Nov 18, 2019 | By Edvard Csanyi
Low Voltage
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Learn to read and understand single line diagrams and wiring diagrams
Single line diagrams are used in common engineering practice as graphical representation of electrical switchboard or assembly containing more sections, i.e. cubicles. Basically, they are simplified and digest picture of whole switchboard, showing only major power equipment and connections to…...
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This content is not available in your premium membership plan. Please upgrade your plan in order to access this content. You can choose an annually based Basic, Pro, or Enterprise membership plan. Subscribe and enjoy studying specialized technical articles, online video courses, electrical engineering guides, and papers.With EEP's premium membership, you get additional essence that enhances your knowledge and experience in low- medium- and high-voltage engineering fields.
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Apr 12, 2019 | By Miodrag Kokotovic
Electric Motor
How to know if you set the correct current on a motor thermal overload relay
The full-load current at a given voltage indicated on the nameplate is normative for setting the overload relay. Because of the variable voltages around the world, motors for pumps are made to be used at both 50 Hz and 60… Read more
Sep 19, 2018 | By Edvard Csanyi
Electric Motor
Protecting Motor From External Network Disturbances (Unbalance, V/Hz-ratio and Re-Energizing)
Unbalance in the supply voltage is typically due to a broken phase condition somewhere in the upstream network. This may result from single-phase fuse failure or pole discrepancy of a circuit breaker or a disconnector. In addition, unequal loading of… Read more
Jan 29, 2018 | By Edvard Csanyi
Electric Motor
Ten different duty types (load cycle) of a three-phase asynchronous motor
The term duty defines the load cycle to which the machine is subjected, including, if applicable, starting, electric braking, no-load, and rest de-energized periods, and including their durations and sequence in time. Duty considered as a generic term, for example,… Read more
Dec 11, 2017 | By Edvard Csanyi
Electric Motor
Troubleshooting three basic hardwired control circuits used in starting electric motor
Generally speaking, basic control circuits are used in starting, stopping, sequencing, and safety automatic interlocking of equipment and machines. The control circuit consists of relays, relay contacts, contactors, timers, counters, etc. Control circuits can also be configured or programed in… Read more
Oct 23, 2017 | By Edvard Csanyi
Electric Motor
Selecting the suitable frequency converter and motor for these 3 applications
The motor is selected according to the basic information about the process. Speed range, torque curves, ventilation method and motor loadability give guidelines for motor selection. Often it is worth comparing different motors because the selected motor affects the size… Read more
May 24, 2017 | By Edvard Csanyi
Electric Motor
Why overmotoring an application is not such a good idea
In many instances, the practice has been to overmotor an application, i.e., to select a higher-horsepower motor than necessary. The disadvantages of this practice are: Lower efficiency Lower power factor Higher motor cost Higher controller cost Higher installation costs Let’s… Read more
Mar 13, 2017 | By Edvard Csanyi
Electric Motor
Practical checks for motor selection on AC adjustable speed drive systems
Important checks to consider in the motor selection for AC adjustable speed drive system: Determine motor enclosure requirements Determine motor torque and speed requirements: Operating speed range Breakaway torque Determine accelerating and decelerating requirements (time and load) Overload Determine type… Read more
Feb 10, 2017 | By Edvard Csanyi
Electric Motor
Ladder logic for special motor control circuits – jogging and plugging
Ladder logic is often used to implement various motor control circuits. Beside standard motor control circuits, there are also special control circuits designed to allow jogging (brief energization of the motor to adjust its positioning) or to prevent plugging (sudden… Read more
Feb 01, 2017 | By Edvard Csanyi
