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