22919 version 2
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Demonstrate and apply knowledge of control system engineering in
mechanical engineering
Level
6
Credits
15
Purpose
This unit standard is intended primarily for use in diploma courses in
mechanical engineering. It covers knowledge of control system engineering
and its practical application to mechanical engineering processes.
People credited with this unit standard are able to: demonstrate knowledge of
principles of control systems engineering, measuring devices, and control
equipment; and control mechanical engineering processes.
Subfield
Mechanical Engineering
Domain
Applied Principles of Mechanical Engineering
Status
Registered
Status date
26 November 2007
Date version published
19 March 2010
Planned review date
31 December 2015
Entry information
Recommended: Unit 21775, Demonstrate knowledge of
mathematical principles for mechanical engineering; Unit
21781, Explain and apply laws of thermodynamics in
mechanical engineering; and Unit 11385, Demonstrate
and apply knowledge of fluid mechanics in mechanical
engineering; or demonstrate equivalent knowledge and
skills.
Accreditation
Evaluation of documentation and visit by NZQA and
industry.
Standard setting body (SSB)
Competenz
Accreditation and Moderation Action Plan (AMAP) reference
0013
This AMAP can be accessed at http://www.nzqa.govt.nz/framework/search/index.do.
Special notes
1
Reference
Bateson, R N. Introduction to Control System Technology. 7th edition. Upper
Saddle River, N. J., USA: Prentice Hall, 2002.
 New Zealand Qualifications Authority 2016
22919 version 2
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2
Definitions
Industry practice – the application of relevant legislation, regulations, standards,
codes, and safe and sound practices generally accepted by competent practitioners
within the mechanical engineering industry.
PID controller – Proportional Integral Derivative controller.
Elements and performance criteria
Element 1
Demonstrate knowledge of principles of control systems engineering.
Performance criteria
1.1
Principles of classical feedback control theory are explained with reference to
input signal, error signal, controller, gain, output, reference sensor, and
feedback signal, and the equation relating these elements.
1.2
Characteristic equations of simple mechanical processes are developed from
first principles.
Range
1.3
evidence of two characteristic equations is required.
Characteristic process responses to forcing functions are sketched.
Range
characteristic process responses – dead time, first order lag,
second order lag, first order lag plus dead time;
forcing functions – step, ramp, sinusoidal.
Element 2
Demonstrate knowledge of measuring devices and control equipment.
Performance criteria
2.1
Different types of process signals and the corresponding signal conditioning
systems are compared with reference to technology, transmission, and
application.
Range
2.2
process signals – pneumatic, analogue electrical, digital electrical.
The operating principles of measuring devices are explained and typical
applications identified.
Range
devices for measuring – temperature, pressure, level, flow,
vibration, linear position, angular position, product quality;
evidence is required for temperature, pressure, level, flow, and two
other types of measurement.
 New Zealand Qualifications Authority 2016
22919 version 2
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2.3
Proportional, derivative, and integral control methods are explained with
reference to output versus time graphs and mathematical formulae for the
output.
2.4
The operating principles of controllers are explained and typical applications
identified.
Range
2.5
controllers – pneumatic, hydraulic, analogue electronic, digital
electronic.
The operating principles of final control elements and actuators are explained
and typical applications identified.
Range
final control elements include but are not limited to – control
valves, pneumatic actuators, hydraulic actuators, heaters.
Element 3
Control mechanical engineering processes.
Range
evidence of control of two processes is required, with at least one process using
a PID controller.
Performance criteria
3.1
Processes are designed and built in accordance with industry practice and
incorporate safety considerations.
3.2
Control equations are developed in accordance with industry practice.
3.3
Controller tuning techniques are applied in accordance with industry practice.
Range
ultimate cycle, process reaction method.
Please note
Providers must be accredited by NZQA, or an inter-institutional body with delegated
authority for quality assurance, before they can report credits from assessment against
unit standards or deliver courses of study leading to that assessment.
Industry Training Organisations must be accredited by NZQA before they can register
credits from assessment against unit standards.
Accredited providers and Industry Training Organisations assessing against unit standards
must engage with the moderation system that applies to those standards.
Accreditation requirements and an outline of the moderation system that applies to this
standard are outlined in the Accreditation and Moderation Action Plan (AMAP). The
AMAP also includes useful information about special requirements for organisations
wishing to develop education and training programmes, such as minimum qualifications for
tutors and assessors, and special resource requirements.
 New Zealand Qualifications Authority 2016
22919 version 2
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Comments on this unit standard
Please contact Competenz info@competenz.org.nz if you wish to suggest changes to the
content of this unit standard.
 New Zealand Qualifications Authority 2016