DC Motor control

1. DC MOTOR CONTROL AND WITH LOAD
SHARING VIA PLC AND SCADA
Sarhad University of Science and Information
Technology, Peshawar

2. GROUP MEMBERS
Sofyan Afzal
SU/10-001-071103
Shams Ullah
SU/10-001-071114
Sheheryar Khan
SU/10-001-071116
Project Supervisor
Engr. Anees Ur Rehman

3. INTRODUCTION
• Load is shared between two motors connected through conveyor
belt.
• Under normal conditions only one motor will operate.
• The second motor will act as an auxiliary motor.
• Sensors are used for counting of objects on conveyor belt.
• The counting process is done for a predetermined value of time.

4. INTRODUCTION
• The counter value is then compared with a preset value.
• If the counter value exceeds the preset value then the
auxiliary motor will operate.
• Each motor can also be switched ON/OFF manually through
SCADA.
• The process is repeated continuously.

5. PLC
• Programmable Logic Controller is a digital
computer used for automation of
electromechanical processes.
• Designed for multiple inputs and outputs.

6. SCADA
• SCADA (Supervisory Control and Data Acquisition) is
monitoring and controlling industrial processes.
• Components
I. Sensors
II. PLCs
III. HMI
• HMI is a device or software that lets users
communicate with a machine.

7. PROBLEM STATEMENT
• The overloading damages the motors.
• In case of single motor the failure can effect the
production.
• Maintenance and installation of large motors is difficult.
• Control is difficult through ordinary switches and relays.

8. OBJECTIVES
• To avoid overloading.
• To make the system reliable.
• To make the maintenance and installation of
motors easy.
• To remotely control and monitor the system.
• To automate the industrial process.

9. BLOCK DIAGRAM

10. METHODOLOGY
• Programming in PLC.
• Motor 1 as a prime mover.
• Motor 2 as an auxiliary.
• Sensors for counting and monitoring.
• Relays for switching.
• The whole process through PLC and SCADA.

11. CIRCUIT DIAGRAM

12. PLC PROGRAMMING CODE

13. PLC PROGRAMMING CODE

14. CONCLUSION
• Automatic and manual switching through SCADA.
• Reliability of system is increased.
• Makes the systems automatic.
• Easy repair and maintenance.
• It makes easy to work in hazardous environment.

15. COST ESTIMATION
S.NO Item Expected cost (PKR.)
1 PLC 18000/-
2 DC motors 4000
3 Mechanical assembly 3000
4 Power supply adapters 1000
5 Miscellaneous 800

16. WORK SCHEDULE
S.NO Steps Date
1 Literature Survey 1/10/2013 to 28/2/2014
2 Hard ware Implementation 1/03/2014 to 30/06/2014
3 Errors Checking and Removing 1/07/2014 to 15/08/2014
4 Thesis Writing and Compilation 16/08/2014 to 15/09/2014

18. Advantages of PLC
• Easy to program
• Can survive harsh environment
– Humidity up to 85%
– Vibration up to 500 Hz
– Temperature -30 to 70 Cͦ
• Large number of inputs and outputs
‒ Nano PLC 6-32 I/O
‒ Micro PLC 32-128 I/O
‒ Smaller PLC 128-256 I/O

19. Advantages of PLC
• More powerful
‒ Can handle large amount of data
‒ Larger RAM and ROM
‒ Powerful Microprocessor
• Modular
‒ ADC module
‒ Weighing module
‒ Voice module
‒ Digital input module…
• Easy to install

20. Advantages of PLC
• Available in great variety in terms of
‒ Inputs/outputs
‒ Memory
‒ Microprocessor…
• Less maintenance
– Resistant to dust
– Humidity
– Corrosive gases (H₂S, SO₂...)
• Long life time
‒ Average up to 10 years