Single Phase Motor Winding Resistance -Start Run Common

This post is about the single phase motor winding resistance. In this post you will learn about the single phase induction motor winding resistance. In the single phase induction motor we have two types of winding. In which one is called main winding also known with running winding. And 2nd winding is called auxiliary winding also known with starting winding.

Single Phase Motor Winding Resistance

This is very important to know about the single phase induction motor winding resistance. Because we did not know about this, we can connect the supply and capacitor to the motor. Or we cannot do the capacitor connection with single phase motor. As I written above that single phase motor have two types winding and each winding a have there resistance. But which winding resistance is high then other winding, that's is important point...

In the single phase motor, the main winding is make from thick wire which means that this winding will me low resistance then starting winding. The starting winding is made from the thin wire (SWG) which means that this wire will be high resistance then other one. 

For example if the main or running winding is made from the 21 SWG and its resistance is 2O ohms. And the starting winding is made from the 24 SWG wire. The resistance of this winding will be high. 

We know that the point in which the two winding connect together is called common point. And the main winding resistance is low then auxiliary winding. which means that the low resistance between common will be the run and high resistance with common will be start. So the supply will be goes to the common and run and capacitor will be connect between the run and start. 

This is single explanation of single phase motor winding resistance, However if you want to learn more about how to identify the start run and common in a single phase motor then read the following articles for complete understanding... 

How to identify start run and common in motor or compressor

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I hope know you will got some knowledge about single phase motor winding resistance and now you will be able to find about the main and auxiliary winding in single phase induction motor. However if you have any question about this post then you ask your question in the bellow comment section.

Staircase Timer Wiring Diagram - Using On Delay Timer And Relay

Today I am sharing staircase timer wiring diagram. In this post you will complete learn how to use a on delay timer as staircase timer with finder 8 pin relay. In the today staircase wiring with timer diagram. I use a on delay timer which mostly use for star delta connection, a 8 pin relay, and push button switches.

Staircase Timer Wiring Diagram - Staircase connection with timer

In the below staircase timer wiring diagram I shown 2 8 pin relay socket, a on daily timer, a 8 pin finder type relay, 2 push button switches, a light bulb and wiring connection.

In the below wiring diagram I shown also the star delta i.c timer wiring diagram. And 8 pin finder relay wiring diagram. In the below wiring connection I use the on delay timer as staircase timer. In the below staircase timer wiring the relay use as holding current device. When someone push the push button the relay the timer and relay operate and light switch on. But when the timer complete the time the timer off the relay and the relay reset the timer. 

So if you want to ON a machine for a specific time then you can use the below connection for motor.

The above staircase wiring with timer diagram is very to understand. However if you have any question then you can use the below comments section. Also read the below post...

Also read:

14 pin Relay Base Wiring Diagram

Why I use 8 pin relay with timer

In the above staircase timer wiring diagram I use the 8 pin finder relay. So I can switch off any device my using the timer than why I use relay in above circuit diagram.

When operate the timer. The timer change the normally close to open circuit in on delay timer but this timer did not switch off himself. In other words the timer did not reset automatically. So in the above case we need to reset timer automatically when the specific timer over. So I use relay as holding current to relay and as reset for timer. 

Now I hope you completely understood that how use a relay as reset switch with timer, and staircase timer wiring diagram. Stay tune with us.... And Take care.

3 Phase Motor Current Calculation Formula Explained

Today I am sharing with new the simple and easy 3 phase motor current calculation formula for LT motors. In this post I am sharing with you a nameplate of 3 phase low voltage induction motor. In the name plate all data given my manufacture company.

3 Phase Motor Current Calculation Formula Explained

In the below image I shown a 3 phase motor nameplate. In the motor name plate the company provide the motor is 15 KW 3 phase induction motor. The Eff of motor is 0.89 and PF is 0.85. The volts of the motor 380V and Amps are 30.1.

So this data is provided by the company. Now first see the image and after that we start doing current calculation of 3 phase motor. That how comply calculate the current of three phase motor and how 30.1 amperes are given in nameplate.

For 3 phase low voltage motor current calculation we need the motor volts, Eff, PF. For three phase motor amps calculation the below formula is used.

3 phase motor current calculation formula is P/(√3xVxPfxEff) or P/(1.732xVxPfxEff) Both are same.

So our motor power is 15KW with 15 x 1000 = 15000 Watts. Motor volts is 380 volts, Eff is 0.89 and PF is 0.85 according the above nameplate.

So if we calculate 15000/(1.732x380x0.85x0.89)

15000/(497.89) So 15000 / 497.89 = 30.12 Amps Or Load current of motor.

By using this formula you can calculate the 3 phase low voltage motor. This is very simple and easy formula.

Also read

DOL Starter Wiring For 3 Phase Motor (Animation Diagram)

Forward Reverse 3 Phase Motor Starter Wiring Diagram

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I hope this 3 phase motor current calculation formula (how to calculate 3 phase motor current) help you. And know you will be able to calculate the load of 3 phase motor by using the above load current formula. Now if you have any question or want to gave us some suggestion about our blog then you can use the below comment section.

Forward Reverse Motor Control Diagram For 3 Phase Motor

Forward reverse motor control diagram. This post is about the controlling and wiring diagram of 3 phase motor forward reverse motor starter. In this post you will complete learn about the forward reverse three phase motor controlling starter diagram. In the 3 phase motor forward reverse starter wiring diagram. I shown the 3 pole MCCB circuit breaker, 2 magnetic contactor, normally open, normally close push button switch, thermal overload relay, 3 phase 4 wire system supply, 3 phase motor with connection, trip indicator light etc. In short this the complete guide of forward reverse starter wiring and installation.

Forward Reverse Motor Control Diagram for Three Phase Motor

For three phase motor forward reverse control circuit. We use 2 'magnetic contactors' as forward reverse switch. Here I showed the forward reverse wiring diagram. In the diagram I connect the incoming three phase supply L1, L2, L3 to the MCCB circuit breaker (molded case circuit breaker). And from the MCCB breaker, I connect the supply to both 'magnetic contactors'.


Here the L1 is connecting to the both contactors first terminal. L2 wire connected to the both 'contactors' 2nd terminal. And L3 wire connected to both 'contactors' 3rd terminal.

But the out connection is different. Where L1 is connected on T1 terminal and connected on T3 terminal in 2nd magnetic contactor. The L2 is connected is both contactor in same terminals (T2). The L3 is connected in T3 terminal in first contactor and in 2nd contactor in T1 terminal.

After that the three phase supply goes to thermal overload relay and from thermal overload relay the soppy goes to the 3 phase motor connection plate and provided to 3 phase motor. Here I have shown the forward reverse motor control diagram for 3 phase motor.

Now come to the controlling wiring. Here I had shown that the both cont actors are 220 VAC. This means that the contactors also required the neutral wire. In the above 3 phase motor forward reverse wiring diagram.
The neutral wire first goes to the thermal overload relay NC contacts and to the light indicator. From the 2nd thermal overload relay Normal close contacts the supply goes to the both contactors coil contacts/terminals. And connect to both magnetic contactors A1-A1 terminals.

After that the L1 wire is goes to the thermal overload relay NO contacts and from 2nd thermal relay NO contacts terminal the wire goes to the Light indicator. So if the motor trip the light indicator will glow up.

For Normally close (red/stop) push button switch the supply comes from the L3 in red color wire. And from the NC switch the wire goes to both NO switches (forward and reverse push button). And from here the Hold current wire goes to the both magnetic contactors NO auxiliary contacts(connection points).


From the forward push button switch the (touch current) supply goes to 2nd contactor NC auxiliary contacts and from the auxiliary contacts the wire goes to the first magnetic contactor NO auxiliary contacts terminal and coil A2 terminal as shown in the above forward reverse motor control diagram.

The same wiring connection is done with the reverse push button switch. The touch or starting current goes from the reverse push button and connect to the first contactor Normally close auxiliary contact/terminal and from the auxiliary contacts the wire goes to 2nd contactor Normally open auxiliary contacts/terminal and contactor coil A2 terminal as shown in above diagram.

In the above connection, if the one contactor energized then other contactor will not energized in same time.

Also Read:
How to wire DOL Stater animation
3 Pole - 4 Pole MCCB Wiring Diagrams And Installation
Digital Ammeter Wiring With Current Transformer - CT Coil

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I hope the above forward reverse motor control diagram / 3 phase motor forward reverse starter wiring diagram help you to understand this connection. Now if you have any question and have any suggestion then you can use the below comments box. I hope you will share this post on social media.

How to control single phase motor from two points

Today you will learn about "how to control a single phase submersible pump motor" or how to control single phase motor from two points. In this type of controlling we used the two magnetic contactor and two double pole mcb circuit breakers (Miniature Circuit Breakers), two normal open push button switches and 2 normal open push button switches.

How to control single phase motor from two places

The motor will control from two places, in which the first place supply will come from the Main kWh Energy meter and for 2nd place the supply comes from kWh check meter or 2nd energy meter.
Here I explain the complete controlling and wiring diagram step by step. In this type of connection a single phase motor used under two householders in which one owner of houses and the 2nd are people who take the 2nd house on rent.

So the motor can be on/off from both places. For that we can do connection as I shown in the below diagram.

In the above how to control single phase motor from two points diagram the first energy meter supply goes to first MCB circuit breaker and kWh check meter. From the kWh check meter the supply goes to the 2nd double pole MCB circuit breaker.

From the first double pole mcb circuit breaker the supply goes to the first contactor and to contactor push button switches or on/off the motor. But here we do an interlock system. In which if the motor start from first contactor then no one can start it from the second place (contactor) in same time. And when the motor switch off from first place then the 2nd person can on/off the motor from second places. But if motor start from the second place then no one can on/off the motor from the first place.

The same connection done with same contactor, the supply comes from the double pole mcb circuit breaker and connect to the contactor. And from there the supply goes to the on/off motor push button swathes. (The start button shown with green color and red button shown as motor OFF button).

The motor output supply is take from the output terminals of contactor and from there the supply goes to the motor as shown in the above diagram. The both output supply are connect together in which the output neutral wire from the first contactor is connected with 2nd contactor output neutral wire and then neutral wire goes to the motor. And same done with Phase (Line) wire.  If you want to learn about the single phase submersible pump starter wiring diagram the read the below guide...

Read Also:
Single Phase Submersible Pump Stater Wiring Diagram

I hope this single phase motor controlling from the two places diagram (how to control single phase motor from two points) help you. If you have any question then you can ask me in the below commenting box.
Note that this diagram is just from information and learning. Don’t try this type of connection in your home himself, and for doing this type of connection call a professional. Stay tune with us and take care…..