16-09-2021

In Electrical Engineering, the most basic topic is Electrical Motor. If you want to drive any mechanical equipment then you have to connect it with Electric Motor.

  1. Auto Manual Dol Starter Diagram
  2. Auto Manual Dol Starter
  3. Auto Manual Dol Starter Kit
Manual

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To drive this Electric Motor, we need Motor Starter.

So, In this blog, we are going to see the What is Motor Starter, Types of Starter and Why do we need starters to start any motor?

Additional to this we will also cover the basic conversion of this motor starter into PLC Programming using Ladder Logic.

Why do we need a Motor Starter?

As we all know that when we supplied a 3-phase supply for the starting of induction motor. Initially, it will take a huge amount(normally 5-8 times more than it’s rated) current. This current reduces as the motor achieves it’s running speed.

This huge current can damage the motor windings. It also generates a voltage dip on the supply line which might result in the malfunction of other connected electrical equipment.

Therefore, Starter is needed to limit the starting current to avoid damage to the motor as well as other connected electrical equipment in the same line supply.

What is Motor Starter?

The Motor Starter is a device that is used to start and stop the motor to which it is connected.

Normally DOL(Direct On-Line) starter is used to start the motor. But for a heavy motor with more power, other advanced starters like Star-Delta, Soft Starter, and VFD Starter is used.

Advanced starter(like Star-Delta, Soft Starter, VFD Starter) applies less voltage to reduce the high initial current, this voltage reduction is for a short time. As the motor accelerates to its running speed, full voltage is applied to the motor.

The motor starter provides other functionality also to protect the motor from any other fault like overload, single phasing, under-voltage, voltage unbalance, stall protection.

There are many types of starter used to start the motor, in this blog we are going to see some basic motor starters and their conversion in PLC ladder logic.

1) DOL Starter

DOL stands for Direct Online Starter, most commonly used in the industry to start the motor.

In this method, full voltage is applied to the motor, but the starting current would be very high(usually 5-8 times more than it’s rated current). For a low capacity motor, there is no need to reduce the voltage at the starting.

Although, it provides all other functionality like overloading, single phasing, and low voltage.

Super mario 3d land decrypted rom download. To develop the PLC ladder logic of the DOL starter, first, we have to look at the control circuit of this starter.

Advantages:

  • Cost-Effective
  • Simple in Construction

Disadvantages:

  • Initial high current
  • Unable to use on Heavy Motors

Here we have inputs like Start push button, Stop push button, Safety switch, Overload relay, and outputs like contactor and ON/OFF indicator.

The conversion of DOL starter in PLC ladder logic is as below,

2) Forward/Reverse Starter

Use

Forward/Reverse starter is another starter used when we need to change the direction of the motor, Through this starter, it is possible to operate the motor in both directions.

Forward/Reverse starter works on the same principle as the DOL starter, but it has additional functionality to change the direction of the motor.

Here you can find the control and power wiring of this starter.

Advantages:

  • Cost-Effective
  • Simple in Construction
  • High Starting Torque

Disadvantages:

  • Initial high current
  • Unable to use on Heavy Motors

Here we have inputs like Start forward, start to reverse and stop pushbuttons, Safety switch, Overload relay, and outputs like forward and reverse contactors.

The conversion of Forward/Reverse starter in PLC ladder logic is as below,

3) Star-Delta Starter

Star-Delta starter is used for heavy motors applications like Pump, Blower, Crusher, etc.

Auto Manual Dol Starter Diagram

Star-Delta starter supplies a low voltage initially at the start, this reduces a torque also. This starter uses a timer, contactor, overload, etc.

In this starter, Star connection is used at the start and Delta connection is used for a normal run.

Star-Delta Starter

Auto Manual Dol Starter

Advantages:

  • Low starting current
  • Good for long acceleration time

Disadvantages:

  • Complex wiring

Here we have inputs like start, stop pushbuttons, safety switch, overload relay, and output like a star, delta, and main contactors.

The conversion of Star-Delta starter in PLC ladder logic is as below,

Final Thoughts

This is all about the basic information about the 3 most common types of electrical motor starters.

Starter

I hope you like this blog, If you want a detailed description of the advanced motor starter like a Soft starter, VFD stater then please comment down below.

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