Monday, March 20, 2017

Refrigerator Overload Protector Testing Using Multimeter

Today I am writing about the refrigerator overload protector testing using multi meter. In this post I will complete guide you about how to test a refrigerator thermal overload protector using a multimeter. As you know that thermal overload protector is designed to protect the refrigerator compressor during over current flow. I also published a post about working principles of refrigerator compressor thermal overload protector. The overload protector is connected near with the starting relay of the compressor, and connects to the compressor common terminal. When the thermal overload protector heat up or make an open connection internally the compressor stop running. The working of thermal protector is that to stop the electric supply during the over current flow to compressor or when the compressor become heat up. Some time when ref compressor become heat up the thermal overload protector stop the electric supply to the compressor to protect the compressor winding from the burning. To learn more about the working of refrigerator thermal overload protector click here.


Also Read
How a overload protector works
How a ptc realy works 
How to test and wire refrigeator thermal thermostat switch

How To Test Refrigerator Overload Protector Using Multimeter


  • The refrigerator overload protector testing is very easy using a multi meter, to test your refrigerator thermal overload protector follow the below steps.
  • First of all off the refrigerator and plug out the refrigerator supply plug form the outlet, or switch off the double pole circuit breaker from which the refrigerator supply plug controlled.
  • The thermal overload protector is connected or install near with the starting (PTC relay) with compressor terminals. Just remove the relay form the compressor and then remove the compressor overload protector.
  • Remove the both wires form the thermal overload protector.
  • Then set you multi meter on connectivity test or diode testing. Connect one testing lead to one terminal of the thermal overload protector and other testing lead to the other terminal of compressor overload.
  • If you find that there are some connectivity then its means that the overload is alright and working properly. And you don't need to replace the overload.
  • And if you don't see any connectivity then waits 5 to 10 minutes and then tests the thermal overload protector again. And if still has no connectivity then its means that your refrigerator overload is internally open connection or cut. And you must change the overload protector with new one with same range.

Refrigerator Overload Protector Testing Using Multi-meter


Here I try to make you understood using simple refrigerator overload protector testing troubleshooting diagram. In the below diagram I shown an Analog multi meter which set on the connectivity test, ohm test (resistance testing). And I connect the one testing lead to one terminal of overload and other testing lead to other terminal of the overload. In diagram I shown that multi meter shown no reading or no connectivity which means that the overload is not working or internally open.

Refrigerator Overload Protector Testing


In the below 2nd fridge thermal overload protector testing troubleshooting diagram. I shown that millimeter shown the reading and shown connectivity between two points which means that overload is working properly and no need to change.

How To Test Refrigerator Overload Protector



In the above diagram I shown and clear that if the refrigerator thermal overload protector have connectivity between two points then its means that overload is working fine. But some time if an overload is not tripping or not make an open circuit during over current flow to the compressor then this overload is not a good overload. So the proper method to test your overload compressor starting time and running time current (ampere) and if the overload is not opening circuit during the over current flow then change the overload protector.


Now if the overload is internally open circuit then change and if it's have a connectivity between both terminals of overload then test other common places and problems of refrigerator not working. I hope by reading this refrigerator overload protector testing guide, now you will be able to test the fridge thermal overload protector. Be safe and follow all safety rolls before start testing or replacing the thermal overload protector to refrigerator compressor.
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Friday, February 17, 2017

3 Phase Submersible Pump Wiring Diagram with DOL Stater

Today I am here to share with you the 3 phase submersible pump wiring diagram. In which I control a three phase submersible pump motor using magnetic contactor. Not only a contactor but also I install the thermal overload relay which will protect the motor form burning in case of over current flow to the circuit. In the diagram I showed the 3 Pole MCCB breaker, magnetic contactor , thermal overload protection relay, and normally open, normally close push button switches. 3 phase submersible pump motor and electric wiring connection. This will be the complete guide of controlling a three phase submersible pump motor using magnetic contactor.

3 Phase Submersible Pump Wiring Diagram Explanation Complete Guide


Before I explain the diagram. I want to write about the device and things in this circuit. In Circuit first we use the MCCB breaker. (Module Case Circuit Breaker)
We used a three pole MCCB circuit breaker in the diagram. This circuit breaker will control the all substances use in the circuit and we can switch on/off the electric power supply by using the three pole circuit breaker. In the diagram I did not control the neutral wire. However if you want to control the neutral (N) black wire then you must use the 4 pole circuit breaker.

The next thing which used in the circuit is the magnetic contactor. Basically a contactor is a type of relay which we can use for different works. However if you want to learn more about the magnetic contactor basic explanation then the below guide is for you.

Also read:

The push button switches which used in the circuit is NC and NO switches. The normally open contacts switch will be use for starting the motor. And normally close contacts push button switch will be used for switch off the motor or load.


The next device which use in the below 3 phase submersible pump wiring diagram is a thermal overload relay. Which we use to protect or switch off the motor or load during over current flow. This device is available in different shapes and different values according load. In thermal overload protector we have move able ampere adjustable. From which we can setup the ampere or load level.





Now come to the wiring connection of three phase submersible pump. This wiring connection is too simple just like our old diagram. In which I showed the three phase motor controlled using contactor and overload relay. You can also read and see the diagram by using the below link.


Three phase submersible Pump Wiring Diagram with direct online starter


First see the 3 phase submersible pump wiring diagram and after that I will explain each step of below connection diagram.




3 Phase Submersible Pump Wiring Diagram
Three Phase Submersible Pump Wiring Diagram


In the above diagram I showed the L1 L2 L3 and N wire incoming supply with red, yellow, blue and black. In which the red, yellow and blue for 3 phases and black color wire for neutral.


The incoming supply goes to MCCB circuit breaker. I shown the three poles MCCB breaker which is for controlling the three phase power supply and you can switch ON/OFF by using the circuit breaker. Then neutral wire is direct and if you want to control the neutral wire then uses the 4 pole circuit breaker.
In the above diagram I shown the magnetic contactor which I also explain, the magnetic contactor wired after the circuit breaker. Click here to learn about magnetic contactor.
After condactor, they connection done between the contactor load main contacts and thermal overload relay main input terminals.
Phase wire connections comes from the MCCB output terminals and connected to NC push button switch and then from the normally close switch, this connection goes to the magnetic auxiliary normally open contacts. And to the normally open switch. From the normally open switch wire will gees to the other side of normally open auxiliary contact and to the stater coil.
The neutral wire connected to the normally close contact of thermal overload relay. And form the other side of thermal overload relay normally close contact wire goes to the other terminal of magnetic contactor coil.
In last does the connection of 3 phase motor or three phase submersible pump to the thermal overload relay main terminals.
Also do the earth wire connection to panel box and to the motor.

I hope now you will be understood, however if you have any question according the 3 phase submersible pump wiring diagram. You can ask your question according to the three phase submersible pump wiring diagram in the below comment section. One thing more the above diagram and text in only for information base and in case of wrong connection done or if we do any mistake by creating this post or diagram, and due any wrong connection done we will not be liable for any losses. For more read our privacy and policy.

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Wednesday, February 1, 2017

Manual changeover switch wiring diagram for portable generator

Today i am writing about manual changeover switch wiring diagram , as you know that we use generator as emergency power source in our house wiring , we can do the generator changeover system in two methods, in which one is manual and 2nd one automatic system. This post is about the manual changeover switch wiring diagram for portable generator, and IN SHAA ALLAH  we also write and make diagram about the automatic changeover switch wiring which we known better with the name of the ATS system. (Automatic transfer switch)


Electrical Manual Changeover Switch Wiring Diagram For Portable Generator


Manual changeover switch are mostly use in 2 types , in which one have the move able knob and 2nd one the handle changeover switch. This post i will shown the complete method of manual or handle change over switch , the knob type manual changeover switch wiring same like handle change over switch and it's just like a voltmeter sector switch.


Last day i am doing some new electrical instillation, and i saw the handle type manual changeover switch, and get a photo for you, which help you in understanding the connection. Note this post is only about handle type manual changeover switch wiring diagram , however the knob type changeover connection is also same.

There are 3 types of changeover switches which we use for generator and main supply or we can also use the changeover switches for two supplies. 

⇒ Type one : which we use for single phase supply, and for single phase generator
⇒ Type two : which we use for 3 phase power supply and generator
⇒ Type three : which we use for 3 phase 4 wire system and generator

In this post i am explaining the type one , Below i shown the single phase manual changeover switch with image and connection & manual changeover switch wiring diagram with complete connection of  main supply and generator supply and out going supply to the load.



manual changeover switch wiring diagram



In the above manual changeover switch wiring diagram , i shown the incoming supply from the energy meter, incoming supply form the portable generator , and out going supply to load or house load.

In the diagram i shown handle type manual changeover switch. in which i done all the connection. On thing more always do earthing connection to the changeover body , if you have the earth wire. This connection can also work with out the earth or ground connection, But in Electrical Works the most important thing is safety so always do ground connection.
In the above diagram the black color denote the neutral wire , red color denote the phase wire (Line / Hot wire) and Green color denote the earth / ground wire.

After this diagram i hope now you will be able to connect a portable generator to house load. here i have an image of  handle type manual changeover switch which capture with my mobile camera.


manual changeover switch

In the above manual changeover switch / transfer switch image, the connection is not done, and not a proper method of installation and wiring, however i capture this image just for you to see the manual changeover switch / transfer switch internally. I hope after the above image and manual changeover switch wiring diagram, now you will be able to connect a portable generator to your house wiring. IN SHAA ALLAH soon i will make a diagram about connection of portable generator to distribution board or how to connect your portable generator to your distribution board.

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Monday, January 2, 2017

RCD Wiring Installation In Single Phase Distribution Board

Today i am wiring about the rcd wiring installation in single phase distribution board. as you know that we always focus on safety and protection in electrical works. And that's because of that electrical works and electrical wiring is more than dangerous form other works. Always safety first in every work.
RCD are available in many types but fixed RCD (residual current device) are number one device to make a great protection in electrical single phase wiring installation.


RCD Wiring Installation In Single Phase Distribution Board


The wiring installation of rcd is very simple in main distribution board, you need to connect the fixed RCD after the main two pole circuit breaker. Here is the rcd wiring diagram in which i install the main distribution board.

rcd wiring diagram in distribution board


In the above distribution diagram i shown the wiring installation of Double pole MCB circuit breaker , rcd circuit breaker, single pole mcb breakers, voltmeter, light indicator. The installation of rcd is too simple in single phase wiring main board.
You need to connect the rcd or do connection of residual current device after the double pole mcb main circuit breaker as i shown in the above diagram.
However lets explain the complete installation of complete main DB board. you need to fallow these steps.

  • First you need to get supply form the main double pole circuit breaker and connect to the rcd fixed rcd breaker as i shown in the above rcd wiring diagram.
  • Now get Hot wire (phase) form the rcd breaker and connect to all one pole mcb breakers and neutral to neutral bus bar as i shown in the above rcd diagram.
  • For wiring of voltmeter and indicator you need to connect the phase supply form the breaker and neutral wire to neutral connection point.
  • The earth connection is connected in the bus bar , or earth connection point.
  • In last you need to get supply from the neutral point and earth point and form circuit breaker for different loads.
In the above rcd wiring installation diagram i shown the incoming supply (N and L). The rcd wiring is too simple and easy connection, however here some other tutorials which help you more to understand it easily.

Also read

I hope after reading this post and rcd wiring diagram, you will be completely understood. However now if you have any question regarding this post or rcd wiring diagram then you can ask me by using the below comment section.
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