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17801 Demonstrate knowledge of single phase motors for electrical

By Laurie Foster,2014-05-06 08:34
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17801 Demonstrate knowledge of single phase motors for electrical

    17801 version 3

    Page 1 of 3

    Demonstrate knowledge of single phase motors for electrical service technicians

Level 4

    Credits 3

    Purpose This unit standard is for use in the training of electrical service technicians. It

    covers the theory and practical connection of single phase alternating current

    (a.c.) motors.

     People credited with this unit standard are able to:

     explain operating principles of single phase electric motors; and

     connect and test single phase electric motors.

Subfield Electrical Engineering

    Domain Electrical Service Technicians

    Status Registered

    Status date 20 June 2006

    Date version published 20 June 2006

    Planned review date 31 December 2011

    Entry information Open.

    Accreditation Evaluation of documentation and visit by NZQA and

    industry.

    Standard setting body (SSB) ElectroTechnology Industry Training Organisation

    Accreditation and Moderation Action Plan (AMAP) reference 0003

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

Special notes

    1 This unit standard designed for learning and assessment off-job.

    2 Competency under this unit standard does not entitle the candidate to perform

    prescribed electrical work without the supervision of a Supervisor of Electrical Work,

    until he/she has been registered and licensed under the Electricity Act 1992.

     ; New Zealand Qualifications Authority 2012

    17801 version 3

    Page 2 of 3

    3 References

     AS/NZS 3760:2003: In-service safety inspection and testing of electrical equipment;

     Electricity Act 1992, associated Electrical Regulations, and referenced New Zealand

    Electrical Codes of Practice and Standards;

     Health and Safety in Employment Act 1992, and associated regulations;

     and their subsequent amendments and replacements.

4 Definition

     Industry practice those practices which competent practitioners within the industry

    recognise as current industry best practice.

5 Range

     Electric motors universal, shaded pole, standard split-phase, capacitor-start,

    capacitor-start-and-run, permanently split.

     Evidence of at least two motors is required.

Elements and performance criteria

Element 1

Explain operating principles of single phase electric motors.

Performance criteria

    1.1 Motor operating principle is explained with reference to circuit diagram,

    construction and connection of stator and rotor, production of rotating magnetic

    field, and method of starting.

    Range reference to mathematical formulae is not required;

     circuit diagrams should be produced from memory.

1.2 The method of reversing the direction of rotation is stated.

    1.3 A typical application is stated in accordance with industry practice.

    1.4 Overload protection is explained with reference to one type of device in

    accordance with industry practice.

    1.5 Method of speed control is explained in simple terms, with reference to a circuit

    diagram.

    1.6 A typical radio interference suppression circuit is described for one single phase

    motor with reference to circuit diagram, typical component values, component

    ratings, and maximum permitted component values.

     ; New Zealand Qualifications Authority 2012

    17801 version 3

    Page 3 of 3

    Element 2

Connect and test single phase electric motors.

Performance criteria

    2.1 Safety inspection and testing in accordance with AS/NZS 3760:2003 confirms

    that the motor is safe to connect to the supply.

    2.2 Motor is connected to the electricity supply in accordance with industry practice

    and Electricity Regulations.

    2.3 Observation and electrical testing confirms safe motor operation in accordance

    with industry practice.

    Range observation direction of motor rotation, smooth and quiet running,

    operation of centrifugal starter switches where appropriate;

     tests polarity, continuity of earthing, on/off switching, live rated-

    voltage, no-load current, full-load current, comparison with name

    plate values.

    2.4 Direction of rotation is reversed in accordance with industry practice.

    2.5 A radio interference suppression circuit is replaced on one motor in accordance

    with industry practice.

Please note

    Providers must be accredited by the Qualifications Authority, 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 the Qualifications Authority 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.

Comments on this unit standard

     Please contact the ElectroTechnology Industry Training Organisation

    reviewcomments@etito.co.nz if you wish to suggest changes to the content of this unit standard.

     ; New Zealand Qualifications Authority 2012

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