Motor Starter Circuits (Motor Control)

Name: Motor Starter Circuits (Motor Control)
Rating: 4.2 (997 reviews)

Motor starter schematics or wiring drawings. Learn to design power & control circuits for motor starters

Created byIconic Educademy, Iconic Techno, Iconic Techno Solution

Last updated 10/2021

English

What you'll learn

Concept of power and control circuits
Designing a circuit : Starter Circuits
How to design schematics
DOL circuit
RDOL circuit
Start - Delta Circuit
Soft starter circuit
VFD starter circuit
Understand how page connectors work

Course content

4 sections • 29 lectures • 2h 2m total length

Introduction & Overview of the course3:33
Hi and welcome to our intermediate course on Motor Circuits - Electrical Schematics
In this course, we will learn about the concept of, building power and control circuits for motor starters.
By the end of this course we will be able to Read, understand and design schematics for motor starter for industrial applications.
But before we start our learning, Please make sure your basic fundamentals about Electrical schematics are clear.
We expect you to know the following :
Basics on schematics & its template
How to read and design basic circuits
Designation, legends & cross referencing
Basic Symbols
knowledge of certain key switchgears like MCCB's, Contactors, Contact multiplication, NO / NC contacts, Lamps etc.
basic DOL starter circuit.
To develop the Basic indication and metering circuit
Be aware of Local/Remote operation
Basic electrical interlocking

Now in case you wish to study or revise any of the above topics - Please refer our
basic course - Electrical Schematics (Industrial Controls Course)

Now coming back to our Motor circuit course: There are 4 sections in this course.
Section 1 : DOL starter circuits & its variations
Why is DOL / RDOL Starter required?
Where is it used?
Their Working principle
Their power and control circuit
Section 2 : Star Delta starter circuits
Why is star delta Starter required?
Where is it used?
It's Working principle
Power and control circuit
Section 3 : Soft starters
Why are soft starters needed?
Where is it used?
It's Working principle
Power and control circuit
Section 4 : VFD
Why is VDF needed?
Where is it used?
It's Working principle
Power and control circuit

And finally you will get an opportunity to design and practice motor control circuits.
By the end of the course, you would have built the skill to logically think and develop the motor control schematics.
So, Let’s begin our Leaning!!!
DOL Schematic3:40
Welcome to this lecture. We will covering the following topics in this lecture:
Induction motors
Why induction motors need starters
Types of Motor Starters
DOL
Star - Delta
Soft Starters
VFD
A quick recap of
DOL starter (or Direct On Line starter or across the line starter)
Power & Control circuit of DOL starters
Additionally we learn, why and which type of switching device can be used in starters
Starter Basics
Variations of DOL Starter2:09
Now that we are aware of simple DOL Starter circuits, let us quickly learn about variations of DOL starters
RDOL (Reversible DOL starter)
HDOL (Heavy starting DOL Starter)

RDOL starters
Where do RDOL starters find application ?
Why is a RDOL starter required ?
Theory behind use of a reversible motor starter
How does the RDOL starter achieve its functioning?
Basic Power & Control circuit
Application of RDOL starters & basic on it
Reversible DOL starter - Power circuit5:13
In this lecture we will cover step by step development of the RDOL schematic
Manually achieving reversible motor rotation
Dynamic change the direction of motor rotation, by using power contactors.
Interlocking between forward & reverse contactors.
RDOL Power circuit
Reversible DOL starter - Control circuit2:08
In this lecture we will continue the step by step development of the RDOL schematic
Indication circuit development of RDOL schematic.
RDOL Starter Circuit
HDOL- Heavy starting DOL4:09
In this lecture we will cover HDOL - Heavy Starting DOL Starters
Why is it required?
Where is it used?
How is it different than DOL starters?
HDOL- Heavy starting DOL

Why Star - Delta Starters are required & working principle.2:58
In the previous section, we mentioned about the design of the motor being responsible for drawing more starting current, and hence, need of a starter for starting the motor.
Drawbacks or problems faced when using DOL starters.
Why Star -Delta starters used ?
Working Principle of Star - Delta starters
Definition of Star - Delta starters
Star - Delta Motor Starter
Star - Delta Motor Starter Power circuit4:30
Now that we are aware of Why Star -Delta starters used ? Let us now proceed to discuss the circuit connections for a typical Star-Delta starter. We start with the Power connections
It is clear that initially, the motor has to be started in star mode. In STAR Connection, the starting or finishing ends (similar ends) of three coils are connected together to form star point. After some time lapse, the motor must run in Delta mode. Which means, the motor windings must get changed to delta connection. For DELTA Connection, the opposite ends of the 3 coils must be connected together.
How we make use of two power contactors – one for Delta connection & the other for Star connection.
Star - Delta Motor Starter Power circuit
Star - Delta Motor Starter Control circuit5:02
In this lecture we will develop the Star delta starter control circuit
How we use a timer
How we do electrical interlocking & why
How & why mechanical interlocking is used.
Indication circuit.
Electrical Interlocking
Star Delta Starter Circuit Variation2:33
Modification / Variation in our Star- delta Circuit.
How make and model number / catalogue number of a particular switchgear, can affect the circuit connections.
Before using any component in a circuit, its technical catalogue must be referred to for its connection diagram. Its data sheet would provide a whole lot of information regarding its application.

Why Soft starters?4:07
In the section we start with discussion starting methods of a motor
Then we focus on Soft starters
What are drawbacks of DOL & Star Delta Starters
Why Soft Starters are required?
How a soft starter functions ?
Benefit of using soft starters
Motor Starter Circuits (Motor Control)
Soft Starter & its Applications4:29
In this lecture we will continue our study on soft starters.
We will do a quick comparison of Soft Starter vs. Direct On Line (DOL) Starter
Then we will see the applications where we can incorporate or use soft starters
Soft Starter Power Circuit2:47
In this lecture we will study about the power circuit of the soft starters from very basic models of the soft starters to higher versions.
Why thyristor fuses are used & where ?
Soft Starter Power Circuit
Soft starter Connection Diagram2:25
In the lecture we will study about the connection diagram of a particular model of soft starter that we have selected to develop the power & control circuit for.
Soft starter Connection Diagram
Soft Starter Control Circuit5:16
In the lecture we will first understand the requirement , based on which we will developing our control circuit.
We have also covered a very important concept of PAGE CONNECTORS here.
How auxiliary supply can be given to the soft starter?
Soft Starter Control Circuit
Cont'd Soft Starter Control Circuit5:20
In this video we will learn how we can give start command to the soft starter.
Cont'd Soft Starter Control Circuit (DI/DO)6:07
In the previous lecture we have completed the start / stop circuit to the soft starter.
Now we study how we can reset the soft starter after it as tripped on a fault.
We study the Digital outputs of the soft starter.
Indication circuit development of the soft starter.
How we can use DO to generate motor ON status that can be used elsewhere.
We will study how we can use interposing relay's.
Fail Safe Circuit
Fail Safe Mode4:29
In the previous lecture, we mentioned interposing relay.
Here we will understand why an interposing relay is ?
Please note we have used an interposing relay firstly to
introduce you to a new switchgear component
its symbol and
how it can be connected in a circuit.
Understanding fail safe mode.
Cont'd Soft Starter Control Circuit (Cooling Fan/ Thermistor Protection)4:28
In this lecture we will learn to develop the cooling fan arrangement circuit.
Then we will connect the Thermistor input & lastly, we will complete the circuit with ground connection.
Cont'd Soft Starter Control Circuit (Cooling Fan/ Thermistor Protection)
Cont'd Soft Starter Control Circuit (PLC CONTROL)4:12
Having completed a basic soft starter circuit and, the control from the feeder, let us now modify it to incorporate controls from PLC.
At the onset, we had mentioned that the circuit we are developing, shall be having local and PLC control.

So, we will briefly discuss, what a PLC is, and what exactly is meant by PLC control.
System understanding
Input to PLC
Output from the PLC
Cont'd Soft Starter Control Circuit (PLC Control Part -2)5:19
In this lecture we will learn how we can control the motor through the PLC
Start command from the PLC
Motor Status - Feedback to the PLC
Controls in a circuit

Why Speed Control is required?2:43
In the previous section, we learnt how Soft starters provided a method for starting motors that require a soft start. Some soft starters provided soft stopping also.

The soft starter, however, has no control over the running of the motor after achieving full speed, except, at the time of stopping of the motor. So, why do we need to control the running of a motor?

To regulate the speed of the running motor! isn't it!

It will be difficult to imagine our life without Speed control of a motor, because nowadays all moving equipment work with the help of motor, it may be a AC motor, DC motor or a Servomotor.
Benefit of speed control
How VFD's help achieve speed control3:00
How to we bring about a change in Speed of AC induction motors ?
What is a VFD? It working principle.
Advantages of Speed control.
Benefit of speed control
VFD Power Circuit6:53
In this lecture we will first understand the system requirement for which we need to develop a circuit.
Then we will learn how to develop our power circuit. We will learn about
Line choke
Thyristor fuses
Output choke
VFD Power Circuit
VFD's Connection Diagram & Control Supply4:49
The connection diagram of the VFD model & Control Supply Sourcing.
VFD's Connection Diagram & Control Supply
VFD Circuit Control Requirements & Indication Circuit3:30
Here, we will understand the requirement of the customer. We shall also be dividing our control circuit in different parts. Then we shall develop the indication circuit for the VFD Feeder.
VFD Circuit Control Requirements & Indication Circuit
VFD Circuit Control (Start Command)5:43
In this lecture we will learn to develop the control circuit - the start command to the VFD (As per our system requirement)
VFD Circuit Control (Start Command)
Fan Failure Status - DI to VFD4:49
In this lecture we will learn how to give start command.
Design cooling fan circuit & how to give FAN failure status.
We will also learn about MCB's Aux. Contacts & how we can use them.
Hold-on Contact
Digital & Analog Outputs6:04
In this lecture we will learn how we can use Digital Outputs for our indication circuit & analog outputs for Metering Circuit.

Requirements

Should have a basic degree or knowledge in Electrical Engineering - B tech, B.E., Diploma or any similar relevant educational background
Basic of Schematics, Basic DOL circuit
You can take our Electrical Schematics - Industrial Control course - to understand the basics

Description

Motor Starter Circuits (Motor Controls) is an intermediate course to learn schematics or electrical drawing (power and control circuits) for Motor Starters. We have covered various concepts that are required to design schematics.

Before you start this course make sure your basics on Electrical Schematics is clear. You can also take our Electrical Schematics (Industrial Controls) course for learning basics. We are also thrilled to share that this course has earned the high ranking of 9.4/10 by CourseMarks and ranks in the TOP 4% of 94,680 courses!

Some of the topics that you will come across in this course are:

1) Basic details on schematics - What is schematic ? Where is it used ? Why is it needed?

2) Reading & Understanding Schematic - Title block, Disclaimer, Template, Designations, Cross-referencing, Legends etc.

3) Symbols & Switchgears - Electrical Symbols along with definition & images. Key technical details about switchgear like circuit breakers,

Contactors Isolators, Meters , Indicators & Protection devices

a) Learn Off load & On Load devices

b) Difference between isolators & circuit breakers

c) NO & NC contacts

d) Power & Auxiliary Contactor - contact numbering, advantages & limitations etc.

e) Instrument Transformers

f) Protection Devices

4) Designing circuit - in a step by step method - DOL Motor Starter Circuit

Control of motors - Star / Stop, Trip
Hold-on Contact
Indication circuits
Local remote
Auto manual operations

5) Basics of electrical interlocking

6) Basics of Metering Circuits

7) Application in Switchboards and practice questions.

Who this course is for:

Final year engineering - B tech, B.E., Diploma.
Electrical Engineers who want to work as electrical designers
Anyone planning to work in LV/ MV Switchboard Manufacturing Companies
Students who want to pursue a career in electrical automation
Students who want to work in electrical contractors and consultants companies.
Anyone who wants to understand electrical control concept / designing of systems/ complicated controls/ various industrial and commercial domestic application.
Panel builder
Electrical designer
Panel wireman
Industrial Automation graduates

Motor Starter Circuits (Motor Control)

What you'll learn

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Course content

Introduction6 lectures • 21min

Star - Delta Motor Starter4 lectures • 15min

Soft Starter11 lectures • 49min

VFD8 lectures • 38min

Requirements

Description

Who this course is for: