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20609 Design an open circuit, proportional hydraulic power system

By Earl Foster,2014-05-06 08:36
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20609 Design an open circuit, proportional hydraulic power system

NZQA registered unit standard 20609 version 2

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    Title Design an open circuit, proportional hydraulic power system with

    open loop control

    Level 5 Credits 10

    Purpose People credited with this unit standard are able to establish

    system specifications for, and undertake design of an open

    circuit, proportional hydraulic power system with open loop

    control.

Classification Mechanical Engineering > Fluid Power - Hydraulics

Available grade Achieved

Entry information

    Recommended skills Unit 18241, Demonstrate knowledge of basic electronic

    and knowledge systems.

Explanatory notes

1 Reference

     Health and Safety in Employment Act 1992.

2 Definition

     Open loop control a general control concept in which a signal travels in one

    direction only from the control device to the actuator or motor. There is no signal

    returning from the actuator or motor to inform the control device that action/motion

    has occurred.

    Industry practice safe and sound practices accepted by the mechanical engineering

    industry.

     Worksite procedures operational procedures put in place by the candidate’s

    employer. These include site safety procedures, equipment operating procedures,

    job procedures, quality assurance processes and procedures, and other procedures

    for the handling and disposal of materials and waste.

3 The following apply to this unit standard:

     a All activities must demonstrate safe working practices.

     b All activities must be completed independently and reported within agreed

    timeframes.

    c The design and specifications of the hydraulic fluid power system is the outcome

    of this unit standard. The actual construction of the system is not a requirement of

    assessment.

Competenz New Zealand Qualifications Authority 2012

    SSB Code 101571

NZQA registered unit standard 20609 version 2

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4 Range

     The hydraulic power system designed for this unit standard must be of an open

    circuit type with open loop control and must include the use of the following range of

    components:

    ; Variable displacement pump(s), which may include but are not limited to vane

    and/or piston.

    ; Fluid conditioning equipment, which may include but is not limited to the following

    filter types - suction, pressure line, and/or return line.

    ; Pressure control valves, which may include but are not limited to relief, reducing,

    and/or sequence (pilot operated and/or direct acting).

    ; Proportional directional control valves.

    ; Flow control valves, which may include but are not limited to compensated, non-

    compensated, proportional.

    ; Non-return valves (NRV).

    ; Power conversion components, which may include but are not limited to hydraulic

    motors, hydraulic cylinders (single or double acting), and semi-rotary actuators.

    ; Auxiliary components, which may include but are not limited to accumulators

    and/or heat exchangers.

    ; Fluid conductors (pipes/hoses/couplings) and gauges.

Outcomes and evidence requirements

Outcome 1

    Establish system specifications for an open circuit, proportional hydraulic power system with open loop control.

Evidence requirements

    1.1 Design brief and operational requirements are confirmed with customer in

    accordance with worksite procedures.

1.2 Component functions are confirmed with customer.

    Range relationship between electrical and mechanical sub-systems,

    variables affecting the performance of the proportional valve(s),

    the role of specialist hydraulic fluids.

    1.3 Specifications are drawn up to meet worksite or customer requirements.

    1.4 Design safety and regulatory requirements are identified and confirmed with

    customer.

1.5 Specifications meet customer’s requirements.

Competenz New Zealand Qualifications Authority 2012

    SSB Code 101571

NZQA registered unit standard 20609 version 2

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    1.6 Personnel associated with end use and complementary services are identified

    and consulted in accordance with worksite procedures.

    Range: may include but is not limited to component and consumable

    materials suppliers, hydraulic specialists, technical writers, staff

    training personnel.

Outcome 2

    Undertake design of an open circuit, proportional hydraulic power system with open loop control.

Evidence requirements

    2.1 Calculations are made to meet operational requirements of the system and to

    determine sizing of components to meet the design specifications.

    Range may include but is not limited to output torque, motor

    displacement, pressure, input power, flow, line size.

    2.2 Terminology and symbols are selected to match specification in accordance

    with industry practice.

    2.3 Design meets specification and operational capabilities.

    2.4 Design and operational capabilities meet safety and regulatory requirements.

    2.5 Documentation meets specifications and operational requirements in

    accordance with worksite procedures.

    Range bill of materials, operating and maintenance manual, service

    schedules, circuit diagram, as built drawings;

    may include but is not limited to training manuals, labelling and

    safety information.

    2.6 Computer modelling is used to test the performance of the system in

    accordance with industry practice.

Replacement information This unit standard, unit standard 20607 and unit standard

    20608 replaced unit standard 2735.

Planned review date 31 December 2016

Competenz New Zealand Qualifications Authority 2012

    SSB Code 101571

NZQA registered unit standard 20609 version 2

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    Status information and last date for assessment for superseded versions Process Version Date Last Date for Assessment

    Registration 1 25 May 2004 31 December 2014

    Review 2 17 November 2011 N/A

Consent and Moderation Requirements (CMR) reference 0013

    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 Competenz on qualifications@competenz.org.nz if you wish to suggest

    changes to the content of this unit standard.

    Competenz New Zealand Qualifications Authority 2012

    SSB Code 101571

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