NZQA registered unit standard
Title
Tune control loops
Level
4
2655 version 6
Page 1 of 3
Credits
6
Purpose
People credited with this unit standard are able to:
 demonstrate knowledge of tuning of control loops;
 tune control loops; and
 demonstrate knowledge of control loop wiring.
Classification
Industrial Measurement and Control > Industrial Measurement
and Control - Theory
Available grade
Achieved
Explanatory notes
1
Reference
ANSI/ISA-5.1-2009 Instrumentation Symbols and Identification;
and all subsequent amendments and replacements.
2
Definition
Industry requirements – includes all asset owner requirements, manufacturers’
specifications; and enterprise requirements which cover the documented workplace
policies, procedures, specifications, business requirements; and quality management
requirements relevant to the workplace in which the assessment is carried out.
Outcomes and evidence requirements
Outcome 1
Demonstrate knowledge of tuning of control loops.
Evidence requirements
1.1
Describe primary methods of control loop tuning.
Range
1.2
initial controller settings, systematic trial and error, ultimate
sensitivity, reaction curve.
Identify correct application and limitations of each tuning method in 1.1 above.
Range
The Skills Organisation
SSB Code 100401
fast control loops, slow loops, initial settings.
 New Zealand Qualifications Authority 2016
NZQA registered unit standard
1.3
2655 version 6
Page 2 of 3
Carry out control loop tuning calculations.
Range
process reaction curve, systematic trial and error, initial controller
settings.
Outcome 2
Tune control loops.
Evidence requirements
2.1
Implement control loop operation using initial controller settings.
Range
2.2
Tune control loops using the closed loop systematic trial and error method.
Range
2.3
may include - flow, level, pressure, temperature;
evidence of two types is required.
Tune fast control loops using the closed loop ultimate sensitivity method and
carry out the appropriate calculations.
Range
2.4
may include - flow, level, pressure, temperature;
evidence of two types is required.
may include - flow, level, pressure;
evidence of one type is required.
Tune slow control loops using the open loop reaction curve method and carry
out the appropriate calculations.
Range
may include - level, temperature;
evidence of one type is required.
Outcome 3
Demonstrate knowledge of control loop wiring.
Evidence requirements
3.1
Interpret control loop wiring diagrams in accordance with industry requirements.
Range
3.2
pressure, level, temperature, flow.
Wire a control loop in accordance with industry requirements.
Range
The Skills Organisation
SSB Code 100401
pressure, level, temperature, flow;
evidence of one of each type is required.
 New Zealand Qualifications Authority 2016
NZQA registered unit standard
Planned review date
2655 version 6
Page 3 of 3
31 December 2017
Status information and last date for assessment for superseded versions
Process
Version Date
Last Date for Assessment
Registration
1
31 October 1995
31 December 2013
Revision
2
30 October 1997
31 December 2013
Revision
3
3 April 2001
31 December 2013
Review
4
22 June 2001
31 December 2013
Review
5
19 May 2008
31 December 2019
Review
6
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.
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