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21228 Demonstrate and apply knowledge of dynamic balancing

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21228 Demonstrate and apply knowledge of dynamic balancing

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    Demonstrate and apply knowledge of dynamic balancing fundamentals

Level 4

    Credits 12

    Purpose People credited with this unit standard are able to: describe dynamic

    balancing, causes of imbalance and instrumentation used in balancing; carry

    out dynamic balancing calculations and procedures; and demonstrate and

    apply knowledge of balancing machines.

Subfield Electricity Supply

    Domain Electricity Supply - Power System Maintenance

    Status Expiring

    Status date 11 December 2009

    Date version published 11 December 2009

    This unit standard is expiring. Assessment against the standard must take place before the expiry date set out below.

    Expiry date 31 December 2012

    Entry information Prerequisites: Unit 21911, Demonstrate knowledge of

    safety on engineering worksites, and Unit 21912, Apply

    safe working practices on an engineering worksite; or

    demonstrate equivalent knowledge and skills.

    Accreditation Evaluation of documentation and visit by NZQA and

    industry.

    Standard setting body (SSB) Electricity Supply Industry Training Organisation

    Accreditation and Moderation Action Plan (AMAP) reference 0120

    This AMAP can be accessed at http://www.nzqa.govt.nz/framework/search/index.do.

Special notes

    1 This unit standard is intended for, but not restricted to, workplace assessment. The

    range statements across the unit standard can be applied according to industry

    specific equipment, procedures and processes.

     ; New Zealand Qualifications Authority 2012

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    2 Definitions

     Balance refers to any non-symmetrical mass or force distribution which causes

    vibration at rotational frequency.

     Balance analyser refers to a range of instruments that measure and display filtered

    1x vibration amplitude and phase. Technologies include accelerometers and

    displacement sensors. Balance analysers may be used which display levels only and

    those which have embedded balance software. Assessment across all elements

    requires the candidate to use equipment of this type to measure and correct

    imbalance.

     Balance standard means a recognised industry balance level which may supersede

    the manufacturer recommendation.

     Machinery in this unit standard includes processing and manufacturing plant,

    propulsion systems, and power generating machines that contain rotating elements.

    3 Evidence is to be demonstrated in correcting static, couple, and dynamic balance

    using both manual calculation and balance software.

    4 Performance and work practices in relation to the elements and performance criteria

    must comply with all current legislation, especially the Electricity Act 1992, and any

    regulations, codes of practice recognised under that statute; Health and Safety in

    Employment Act 1992; the Resource Management Act 1991, and their subsequent

    amendments. Electricity supply industry codes of practice and documented industry

    procedures include the Safety Manual-Electricity Industry (SM-EI) (2004) Wellington:

    Electricity Engineers Association. A full list of current legislation and industry codes

    is available from the Electricity Supply Industry Training Organisation, PO Box 1245,

    Waikato Mail Centre, Hamilton 3240.

    5 ‘Industry requirements’ include all the documented workplace policies, procedures,

    specifications, business and quality management requirements relevant to the

    workplace in which assessment is carried out.

Elements and performance criteria

Element 1

    Describe dynamic balancing, causes of imbalance and instrumentation used in balancing.

Performance criteria

1.1 Terminology used in dynamic balancing is described.

    Range may include but is not limited to amplitude, phase, vector, trial

    weight.

1.2 Causes of imbalance in rotating machines are described.

    Range must include but is not limited to mechanical imbalance, thermal

    imbalance, magnetic imbalance.

     ; New Zealand Qualifications Authority 2012

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    1.3 The balance analyser and transducers are selected as appropriate for the

    balance application.

    Range may include but is not limited to accelerometer, photo

    tachometer.

Element 2

Carry out dynamic balancing calculations and procedures.

Performance criteria

    2.1 Calculations on dynamic balancing are demonstrated graphically, using balance

    programs.

    Range may include but is not limited to single and two plane.

    2.2 Suitable balance weights for the software application are selected.

    Range may include but is not limited to trial weight size, weight

    materials, weight attachment.

2.3 Relevant balance standard is applied.

    2.4 Information requirements for balance reports are recorded in accordance with

    industry requirements.

    2.5 The ability to split and resolve balance weights is demonstrated.

Element 3

    Demonstrate and apply know ledge of dynamic balancing machines.

Performance criteria

    3.1 Basic principles of balancing machines are described in terms of soft bearing

    and hard bearing.

3.2 Causes of balancing errors are identified.

    Range may include but is not limited to tracking errors, sensitivity,

    phase error.

3.3 Relevant balance standard is applied.

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.

     ; New Zealand Qualifications Authority 2012

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    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 2012

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