NZQA registered unit standard
28076 version 1
Page 1 of 4
Title
Demonstrate and apply knowledge of advanced control loop
methods
Level
4
Credits
7
Purpose
People credited with this unit standard are able to:
 demonstrate knowledge of advanced control loop methods;
 configure advanced control loops; and
 tune advanced control loops.
Classification
Industrial Measurement and Control > Industrial Measurement
and Control - Theory
Available grade
Achieved
Explanatory note
1
Reference
ANSI/ISA-51.1-1979 (R1993) Process Instrumentation Terminology;
and all subsequent amendments and replacements.
Outcomes and evidence requirements
Outcome 1
Demonstrate knowledge of advanced control loop methods.
Evidence requirements
1.1
Describe limitations of single loop control.
Range
1.2
Describe principles and application of cascade control.
Range
1.3
no load correction, no supply correction.
primary loop, secondary loop 5 to 10 times faster;
inner loop types – valve positioner, flow, temperature (fast),
pressure.
Describe application and principles of ratio control.
Range
The Skills Organisation
SSB Code 100401
mixing and blending, multiplier module, feedback trim.
 New Zealand Qualifications Authority 2016
NZQA registered unit standard
1.4
Describe application and principles of feed-forward control.
Range
1.5
select high, select low.
Describe application and principles of adaptive control.
Range
1.8
two control valves, heating and cooling applications.
Describe application and principles of auto-selector control.
Range
1.7
demand compensation, improved control loop response;
feed-forward element – flow, pressure, temperature.
Describe application and principles of split range control.
Range
1.6
28076 version 1
Page 2 of 4
pre-programmed adaptive, self-adaptive, self-tuning.
Describe boiler feed-water control principles.
Range
single element, two element, three element, temperature and
pressure compensation, shrink-swell dynamics of the drum.
Outcome 2
Configure advanced control loops.
Evidence requirements
2.1
Configure cascade control loops and make operational.
Range
2.2
Configure feed-forward control loops and make operational.
Range
2.3
transmitters, feed-forward element selection, controller action,
summer variables, correct interconnection of controller
components.
Configure ratio control loops and make operational.
Range
2.4
controller action (primary and secondary), element selection,
transmitters, correct interconnection of controller components.
transmitters, linear, square root controller inputs, controller action,
correct interconnection of controller components.
Locate, interpret, and apply technical information to maintaining equipment.
Range
The Skills Organisation
SSB Code 100401
transmitters, controllers.
 New Zealand Qualifications Authority 2016
NZQA registered unit standard
28076 version 1
Page 3 of 4
Outcome 3
Tune advanced control loops.
Evidence requirements
3.1
Identify tuning and adjustment methods to be applied to each type of control
loop.
Range
3.2
initial controller settings, systematic trial and error, ultimate
sensitivity, reaction curve.
Tune cascade control loops and interpret and document resulting chart records.
Range
inner (secondary) loop first, outer (primary) loop second.
3.3
Tune ratio control loops and interpret and document resulting chart records.
3.4
Tune feed-forward control loops and interpret and document resulting chart
records.
3.5
Apply personal and plant safety precautions.
Range
pressure, temperature, chemicals.
Replacement information
This unit standard replaced unit standard 2660 and unit
standard 2661.
Planned review date
31 December 2017
Status information and last date for assessment for superseded versions
Process
Version Date
Last Date for Assessment
Registration
1
28 November 2013
N/A
Consent and Moderation Requirements (CMR) reference
0003
This CMR can be accessed at http://www.nzqa.govt.nz/framework/search/index.do.
Please note
Providers must be granted consent to assess against standards (accredited) by NZQA,
before they can report credits from assessment against unit standards or deliver courses
of study leading to that assessment.
Industry Training Organisations must be granted consent to assess against standards by
NZQA before they can register credits from assessment against unit standards.
The Skills Organisation
SSB Code 100401
 New Zealand Qualifications Authority 2016
NZQA registered unit standard
28076 version 1
Page 4 of 4
Providers and Industry Training Organisations, which have been granted consent and
which are assessing against unit standards must engage with the moderation system that
applies to those standards.
Requirements for consent to assess and an outline of the moderation system that applies
to this standard are outlined in the Consent and Moderation Requirements (CMR). The
CMR 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.
Comments on this unit standard
Please contact The Skills Organisation reviewcomments@skills.org.nz if you wish to
suggest changes to the content of this unit standard.
The Skills Organisation
SSB Code 100401
 New Zealand Qualifications Authority 2016