Learning Outcomes and Assessment Criteria
LO1
Describe the main elements of an electronically controlled industrial system
P1
Describe the main elements of an electronically controlled industrial system
P2
Review the main concepts underlying electronically controlled industrial systems
M1
Analyse the characteristics of an electronically controlled industrial system by applying a variety of techniques to the solution of a given problem
D1
Critically examine the performance of an electronically controlled system to make recommendations for improvement
A1 Describe the design and operational characteristics of a PLC system
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Introduction
The speed and efficiency of many industrial processes is due, largely, to the control systems selected for the application and the engineer’s ability to apply the most appropriate technology for their operation.
This unit presents a structured approach to the development of advanced electronic solutions in a range of industrial situations. An essential requirement here is the engineer’s ability to utilise the most appropriate technology for each application, to ensure the most efficient monitoring and control of variables such as pressure, temperature, and speed.
Among the topics included in this unit are techniques and applications of electrical and electronic engineering, as they apply to various branches of industry, such as component handling, controlling the speed or torque of a motor or responding to change of circumstances in a process.
On successful completion of this unit students will be able to describe system elements and consider their overall characteristics. This provides opportunity for analytically assessing the accuracy and repeatability of electronic instruments.
Task 1(P1, P2)
(a)Review the main concepts underlying electronically controlled industrial systems which makes them ideal for modern industrial systems monitoring and control.
Describe the following two industrial control systems giving practical industrial examples.
Motion control
Process control
(b)Draw a block diagram of a closed loop showing all the elements of an industrial system. Describe the following elements and explain their function in an electronically controlled industrial system.
Error detector
Controller
Actuator
Manufacturing Process
Measurement Devices
(c)Referring to a practical closed loop control system describe the terms manipulated variable, Measured variable and the controlled variable.
Task 2 (M1)
(a)The drive system in fig 1 shows the three major sections of a DC drive in a feedback configuration. Explain the function of the three sections.
Operator controls
Drive control
DC motor
(b)Analyse the two feedback techniques (internal and External) which have been used to monitor the speed of the motor explaining with reasons which method is more accurate.
(c) Explain with the aid of circuit diagrams the terms half wave speed control and full wave speed control
Task 3 (D1)
(a)Explain the four control modes which can be performed by the controller in a closed loop system.
On- Off
Proportional
Proportional-Integral
Proportional-Integral-Derivative
(b)A factory is using an electrical system to control the temperature of a furnace. The control system uses a thermostat to turn the solenoid fuel valve ON of OFF. As shown in fig 1.
This system has been identified by a senior engineer as not very effective. It has been noted that the actuator’s respond is not adjusting the output to exactly required by the process demand
You have been assigned the project to modify the control system from a simple ON/OFF control to an electronic proportional control by making two changes.
Replace the ON/OFF switch(thermostat) by a thermistor in a bridge network
Replace the solenoid type of fuel valve in the furnace to a proportional valve
Critically analyse the performance of the simple ON/OFF control and design an electronically controlled system making recommendations for improvements. You should employ your knowledge of operational amplifiers resistors bridge network to design a system which will give a better proportional control. Assume that when the temperature in the furnace is at 70 degrees (set point) then the fuel valve is 50% open.
Learning Outcomes and Assessment Criteria
Learning Outcome
Pass
Merit
Distinction
LO1 Describe the main elements of an electronically controlled industrial system
P1 Describe the main elements of an electronically controlled industrial system
P2 Review the main concepts underlying electronically controlled industrial systems
M1 Analyse the characteristics of an electronically controlled industrial system by applying a variety of techniques to the solution of a given problem
D1 Critically examine the performance of an electronically controlled system to make recommendations for improvement
Recommended resources
Textbooks
Textbooks BIRD, J. (2013) Electrical Circuit Theory and Technology. Routledge. HUGHES, E. et al. (2012) Electrical and Electronic Technology. Pearson. REHG, J.A. and SARTORI, G.J. (2005) Industrial Electronics. Prentice-Hall. WILAMOWSKI, B.M. and IRWIN, J.D. (2011) The Industrial Electronic Handbook: Fundamentals of Industrial Electronics. CRC Press.
Websites
http://www.bath.ac.uk/ University of Bath Patents (General Reference)
http://www.bsigroup.com/ Business Standards Institution Standards Catalogue (General Reference) https://www.ieee.org/ Institute of Electrical and Electronics Engineers Standards (General Reference) http://www.theiet.org/ Institution of Engineering and Technology (General Reference) http://www.newelectronics.co.uk/ New Electronics Digital Magazine (Journals) http://www.theiet.org/ Institution of Engineering and Technology (Journals) http://www.epemag.com/ Everyday Practical Electronics (Journals)
https://www.ieee.org/ Institute of Electrical and Electronics Engineers (Journals)
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