Motor Specifications – Voltage,Ampere and Frequency

These parameters are important to clarify our application design from voltage value,phases,full load ampere, overload setting and frequency setting if using Variable Speed Drive.

As an electrician,we must fully understand what is mean by voltage, ampere and frequency to ensure our application safe and working properly.

Ok…let we start our discussion and explanation about Voltage, Ampere and Frequency on Electric Motor Nameplate.


What is Rated Voltage?For simple understanding, rated voltage is manufacturer design for suitable operated voltage value with optimal performance.We can refer the motor voltage and phases on the nameplate also can decide either voltage/phases is available in our installation or not.Every country have different value of voltage.Please make sure your motor are followed standard country voltage. Read More

Troubleshooting guide when motor overload trip

On my last post,I’d discussed about motor overload relay that are common used for motor starter application.As we known,the main purpose of motor overload relay is to protect our electric motor winding from mechanical overload that can result the serious damage.

This time I want share basic guideline or troubleshooting method how to troubleshooting when motor overload relay trip.I hope this post can give some ideas or clear view when you face this similar problem during your routine jobs. read more

AC motor protection device

As we know,motor protection is one of the important criteria when we involve for AC motor installation,wiring and termination works.Commonly magnetic contactor,fuse, Molded case circuit breaker (MCCB) and overload relays are used for motor control device of induction motor.

In general ideal for motor protection,it have two basic protections always installed for every motor are Over-load protection and Short-circuit protection.For advance protection we can added for protection against unbalanced supply voltages, under voltage, reverse phase, over temperature and stalling etc. read more

Determining electric motor load and efficiency

As we known,the electric motor is the one of important equipment to drive the operation smoothly from beginning to end of product.

Electricity cost normally around 60% came from electric motor running.It become more worth if installed motors are oversized,low efficiency,under design,poor maintenance or mismatched.

So to know the actual motor performance, we need to determine electric motor load and their efficiency to eliminated all problems that can cause the high electricity cost and breakdown.

We need to collected several important data from our electric motor to made comparison and analysis about load and efficiency.

read more

Sizing for magnetic contactor

When we design or replaced the magnetic contactor for motor starter or for others application,the important point is how to sizing the size of magnetic contactor.This is critical point because if we not sizing properly,it can cause a serious damage and our application maybe failure to perform in perfect condition.

This time i want  shared some information and basic technique how to sizing the magnetic contactor with properly method and suitable with our application needed.It is to ensure our application design is correctly function and have a good resulted. read more

Types of motor overload relay

A motor overload relay is an electro-mechanical relay that is operated by heat developed in the relay.When the level of current in a circuit reaches a preset value, the increased temperature opens a set of contacts.

Overload relay should install in our motor starter application for extra protection.Overload relay can avoid serious damage for electric motor when overload happen to our system with proper setting.

The increased temperature opens the contacts through a bimetallic strip or by melting an alloy that activates a mechanism that opens the contacts depend on our setting for overload relay.This time i explain detail about common types of overload relay for motor control. read more

motor nameplate information #5 – Reliability

This information is useful for troubleshooting and commisioning.It can tell us about the reliability of electric motor.We can design the area or room with such as good ventilation,enough space for maintenance works and suitable with motor application.

This information also can use for safety purpose.we can design the safety working area for that motor and can protect a user or operator from any electric shock or others danger.

The work load is important to ensure the motor can run efficient and not over their capacity.We must design the motor application suitable with working load. Read more

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