How to Control Single Phase Motor Using Analog a Timer


≡ Our Goal

Today we will learn how to control single phase motor using a timer. We will also learn,

  1. About single phase motor control
  2. DOL starter circuit connection
  3. How to control a single phase motor with timer
  4. Also, we will learn about any analog timer.


≡ Description:

This is a single-phase motor controlling circuit using an analog timer. In this episode, we will describe it. The motor control system is mainly used in the industrial automation system for different types of working processes. This project is very simple but most important for an automation engineer. So, if you’re a beginner in the automation sector, it will be helpful for you.


≡ What we need for this project:

  • Single-phase motor
  • Magnetic contactor
  • NC and NO push-button switch
  • Timer (we will use an analog timer)
  • AC power supply 220V 50/60 Hz
  • Connecting wire


≡ Single-phase motor:

Generally, a single-phase motor is an electrically-powered rotary machine that can convert electric energy into mechanical energy.


Magnetic Contactor:

A magnetic contactor is an electromagnetic switching device which is used in the electric motor to balance the change in frequency of the motor. Its uses for switching off the motor from ON and OFF state.


A push switch or push button is a switch that generally defines only two state HIGH/LOW or ON/OFF. To make this project we will use two type push switch:

  1. NC (Normally closed) push-button switch
  2. NO (Normally opened) push-button switch



Timers are used to measure specific time intervals. But in electronics engineering terms, timing also referred to as counters often. We used anly an analog timer for this project.


Working principle of this project:

In this circuit, we use two push switch (NO/NC), two magnetic contactors, one-timer, one-timer base, one motor, and an AC 220V power supply. We know, A Single-phase motor is a simple motor that operates on single-phase A.C.  Supply and the motor torque are produced due to the induction of electricity caused by the alternating magnetic fields.



≡ Wiring:

This circuit connection is first of all (220 AC) Input supply voltage for the push switch. AC 220V phase line we connect Push switch NO and NC are 2 terminal, this NO one terminal and NC one terminal are short and another two-terminal we connect magnetic contactor.

This connection is NO switch two-pin connects this magnetic contactor A1 pin. And NO and NC switch short connect this magnetic contactor NO pin, this is latching connection. Then NO switch two-pin already connect magnetic contactor A1 pin, Now A1 pin to L1 pin and magnetic contactor NO pin is short. And 220V AC neutral line connects this magnetic contactor A2 pin, Now A2 pin to L2 pin are short.

First of all, we need a magnetic contactor connection. We know that Magnetic contactor connection is L1 to T1, L2 to T2, and L3 to T3 is short. So now I have two output terminals, there are T1 and T2. Now, this terminal connects the timer base. T1 terminal connects to the timer 7 pin and the T2 terminal connects this 2 pin.

Then we know that timer base connection. Timer base 7pin short 8 and 1 pin. Timer base 8 pins to 5 pins and 1 to 4 pin internal connection. This is an NC contact; pin 3 and 6 is a NO contact. Then timer base 2 and 6 pins connect this magnetic contactor. 2 pins connect the magnetic contactor L2 pin and 6 pins connect the magnetic contactor L1 pin.

Now magnetic contactor L2 pin A2 pin is short and L1 to A1 pin short. We know that the magnetic contactor L1 pin to the T1 pin and L2 pin to the T2 pin is internally short. At last T1 and T2 pin are connect this output load single-phase (motor). This circuit working process is first of all it takes Input from the power supply unit. Then, if we press the NO push button switch, the first magnetic contactor will ON and latches it. After 5 seconds later

The timer will change the mode from normal to run mode.  While the timer is ON, the second magnetic contactor also ON and the motor running till the magnetic contactor is ON.



≡ Applications:

  • Water pump motor control
  • Industrial Automation Process
  • Car and Other vehicles factory motor controlling
  • Washing machine motor control
  • Vacuum cleaners, fans, centrifugal pumps, blowers, etc.

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