How to use three phase motor in single phase power supply

11/12/2014 by 58 Comments

This time,I would like to share some important knowledge that I used it when faced emergency or critical situation.What are you doing if have only three phase motor and single phase power supply available?

How to use three phase motor in single phase power supply?Actually three phase motor can operate in single phase power supply  with the help of a permanent CAPACITOR.This small thing (capacitor) very helpful to make three phase motor running in single phase power supply.

As per our last discussion about three phase motor,normally it’s have two(2) common winding connection ,STAR or DELTA connection.In this post,I explained how to wiring the capacitor in three phase motor,how to change motor rotation,how to estimate value of capacitance and selection of suitable capacitor. Read More

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Electric Motors Voltage and Balance

17/12/2012 by Leave a Comment

When we plan to install an electric motor for our application,the one of  important parameter that we MUST verify is about VOLTAGE.Ensure the voltage is balance between phase to phase.

Motor voltages should be kept as close to the nameplate value as possible, with a maximum deviation of 5 %. Normally motors are designed to operate within 10% of nameplate voltage.

What happen if your voltage variations is large than nameplate voltage?The answer is if  voltage variations larger than motor nameplate voltage,it’s can have several damage effects to the motor on torque, slip, current, efficiency,power factor, temperature, and service life. read more

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Troubleshooting Electric Motors – Part 1

12/12/2012 by 3 Comments

Breakdown causes by electric motor failures always happen in our operation due to of 2 major factors.It is Mechanical component defect and Electrical circuit failure.

Typical instruments used for troubleshooting motor operation problems include a Multimeter, Clamp-on Meter,Insulation Resistance Meter, and Infrared Thermometer. These instruments are used to measure voltage,current, resistance, insulation resistance, and temperature.

But when we involve for electrical testing,it have a risk and can lead to injury or electrical shock.We must aware during handling electric motor and to reduce the risk we need to follow safety procedure to avoid any incident by certain to read more

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How to setting the timer for star delta starter?

07/09/2012 by 20 Comments

How many second we need to setting for changeover timer from STAR to DELTA sequence for Star Delta Starter?This question is very popular among electrician around the world when handling the Star Delta Starter for their application.

From my experience,honestly,it quite difficult to get the accurate times for star delta changeover.But we can get the approximate times with several monitoring technique and measuring equipment to decide the best setting for change over timer of Star Delta Starter.From this post,i would like to share some information and basic technique how to get the approximate times for Star Delta Starter change over timer.I hope from this post,it’s can give some ideas or clear view how to setting the times for Star Delta Starter change over timer.

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Procedure to change a new electric motor

17/08/2012 by Leave a Comment

The main purpose of this 16 steps  is to look at the systematic and proper work sequence on disconnecting the wiring,check the motor nameplate, specification when replacing the motor until complete the task.

I would like to share my routine standard procedure for replacing a new motor.I created this procedure follow the safety guideline and reference from my experience in electrical motor installation.It have 16 steps that can ensure the installation jobs will done in safety and proper way to contribute the quality of works.

I hope this procedure can give some basic reference and guideline for all of you how to change a new motor.Please share a comment or suggestion to improve this procedure. read more

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Star Delta Circuit Diagram

18/01/2012 by 41 Comments

The most active post in Electrical Engineering Centre blog is Star delta starter and Star Delta motor connection.I received many comments and request for Star Delta circuit diagram.

So this time i want share my simple star delta circuit diagram completed with power and control line circuit.I hope it can be as basic reference for all electrician about star delta starter diagram.

Star delta starter is a common used in domestic and industry sector to drive variant application such as chiller water pump,machinery,air-compressor and many more equipment. read more

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DC motor starting

28/10/2011 by Leave a Comment

DC motor is the one of common types of motor that used for industrial application.It have more advantage and suitable for more heavy application in industry.

This time i want share some basic information how DC motor starting.It important because from this we can know how to build and setting the controller for DC motor.

As we known,DC motor types such as fractional-horsepower shunt, series, and compound DC motors can be started by connecting the motor directly to DC line voltage. read more

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