Good Morning & Wel come : Good Morning & Wel come
Motor control Circuits : Motor control Circuits
Objectives: : Objectives: Upon successful completion of this course, you will be able to construct the following circuits:
Direct on line control (DOL)
Forward or Reverse control
Direct reversing
Reversing after stop
Reversing by Jogging
Star- Delta control circuit
Manual control circuit
Automatic control circuit 21st July 2011
Direct on line control (DOL) : Direct on line control (DOL)
Overview of motors : Overview of motors
Parts of motor : Parts of motor 21st July 2011 Fan Rotor End Plate Bearing Shaft
Parts of motor count…. : Parts of motor count…. 21st July 2011
Terminal identification of motor : Terminal identification of motor Fixed terminals Changeable terminals 21st July 2011 Star connection Star / Delta connection
Terminal identification of motor : Terminal identification of motor 21st July 2011
Star connection : Star connection 21st July 2011
Star connection in real motor terminals : Star connection in real motor terminals 21st July 2011
Delta connection : Delta connection 21st July 2011
Delta connection in real motor terminals : Delta connection in real motor terminals 21st July 2011
Overview of control components : Overview of control components 21st July 2011
Parts of contractor : Parts of contractor 21st July 2011 Auxiliary contract terminals
NO / NC Main contract Magnetic coil terminal
Always check the coil working voltage : Always check the coil working voltage 21st July 2011 Magnetic coil voltage is 220 V 50Hz
( Single phase supply) Magnetic coil voltage is
145 V 50Hz
( Three phase supply)
Overload rely : Overload rely 21st July 2011 Symbol use for control circuit Symbol use for power circuit
Timer : Timer 21st July 2011
Timer : Timer 21st July 2011 Connection terminals Timer
Direct control : Direct control
Direct start control circuit : Direct start control circuit 21st July 2011
Direct start power circuit : Direct start power circuit 21st July 2011
Device list : Device list F1 = Main fuse
F2 = Control fuse
K1 = Main contactor
S1 = OFF Push Button
F3 = Overload relay
S2 = ON Push Button
M1= Three phase induction motor 21st July 2011
Slide 24 : 21st July 2011
Control circuit terminal identification numbers : Control circuit terminal identification numbers 21st July 2011
Power circuit terminal identification numbers : Power circuit terminal identification numbers 21st July 2011
Practice Time : Practice Time 21st July 2011
Reversing of Three Phase Motors : Reversing of Three Phase Motors 21st July 2011
Three methods of Forward Reverse control : Direct reversing
Reversing after stop
Reversing by Jogging 21st July 2011 Three methods of Forward Reverse control
Direct reversing (Control Circuit) : Direct reversing (Control Circuit) 21st July 2011
Direct reversing (Power Circuit) : Direct reversing (Power Circuit) 21st July 2011
Slide 32 : (Reversing of Three Phase Motors) In order to make motor run “forward” or “reverse” condition, use the given line arrangement to connect to the motor ( Power terminal connection of the three phase motor)
Practice Time : Practice Time 21st July 2011
Reversing after stop(Control Circuit) : Reversing after stop(Control Circuit) 21st July 2011
Practice Time : Practice Time 21st July 2011
Reversing by Jogging : Reversing by Jogging 21st July 2011
Reversing by Jogging : Reversing by Jogging 21st July 2011
Practice Time : Practice Time 21st July 2011
Star Delta control circuit : Star Delta control circuit
Why Star Delta control operation is used? : Why Star Delta control operation is used? 3 phase motor draws more starting current while starting
High or excessive starting current can burn motor or other components
So while starting motor, we have to reduce the starting current
Star-Delta control is used to reduce the starting current 21st July 2011
Types of Star Delta control circuit : Types of Star Delta control circuit Manual control circuit
Automatic control circuit 21st July 2011
Manual control circuit : Manual control circuit 21st July 2011
Star delta power circuit : Star delta power circuit 21st July 2011
Practice time : Practice time
Automatic star delta control circuit : Automatic star delta control circuit
Slide 46 : 21st July 2011
Practice time : Practice time
Thank you : Thank you