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Elements and Performance Criteria

  1. Prepare to Diagnose and rectify faults.
  2. Diagnose and rectify faults.
  3. Completion and report fault finding and repair activities.

Required Skills

This describes the essential skills and knowledge and their level required for this unit

Evidence must show that knowledge has been acquired of safe working practices and diagnosing faults in renewable energy control systems

All knowledge and skills detailed in this unit should be contextualised to current industry practices and technologies

KSEKA

Renewable energy system electronics

Evidence shall show an understanding of renewable energy systems fault finding to an extent indicated by the following aspects

Fault finding techniques encompassing

Factors to consider in clarifying the nature of a fault encompassing

Initial fault report

Confirmation of symptoms of the fault

Comparison of symptoms with normal operation

Effect to cause reasoning assumptions of possible causes

Methods for testing assumptions encompassing

Visual inspection

Sectional testing

Splithalf tests

Component isolation

Dealing with intermittent faults

Semiconductor components encompassing

symbols for common semiconductor components including rectifier diodes LEDs zener diodes bipolar transistors Darlington pairs MOSFETs IGBTs SCRs and triacs

basic function of these devices above

major rating parameters of device above

applications for each device

IV characteristics of diodes and the current gain characteristic of bipolar transistors

T Linear regulated dc power supplies encompassing

label circuit diagrams for half wave and full wave single phase and three phase rectifiers

voltage and current waveforms for these rectifier circuits with and without capacitor filtering

peak output voltages from single phase and three phase rectifier circuits

block diagram showing the structure of a regulated DC power supply

main features of linear integrated circuit voltage regulator ICs

each of the major components and their physical location in a regulated power supply

T Switching power control circuits encompassing

power dissipation of a transistor when operated as a switch

how Pulse Width Modulation PWM can provide a variable output voltage from a switch mode regulator

advantages and disadvantages of switch mode power circuits compared with linear power circuits

block diagram of a basic PV switching voltage regulator for battery charging

applications of switch mode circuits found in renewable energy systems

how power control in AC circuits is achieved using SCRs and Triacs

methods used to reduce radio frequency interference RFI in DC and AC circuits utilising high speed switching

T Digital electronic circuits encompassing

characteristic features that distinguish analogue and digital devices and circuits

how numbers or text information can be represented using binary numbers and how these are represented in digital circuits

operation of voltage comparators Analogue to Digital AD converters and Digital to Analogue DA converters and give one example of each ones use in a renewable energy application

basic function of microcontrollers volatile and nonvolatile memory devices

operation of a solar hot water system pump differential controller as an example of the use of logic in digital circuits

T Inverters encompassing

basic function of inverters and dc dc converters and their use in renewable power systems

the operation of an inverter bridge and halfbridge

output voltage waveforms for square wave modified square wave and synthesised sine wave inverters showing typical voltages and timing

the function of PWM techniques in modified square wave and synthesised sine wave inverters

block diagrams showing the structure of common forms of dcdc converters and inverters used in renewable energy applications

T Maintenance encompassing

safety procedures for work on electronic systems circuits and apparatus

hazards that may be encountered when performing tests on inverters battery chargers or other equipment containing LV circuits

functionality of electronic equipment through appropriate client questioning and application of systematic tests and observation

various types of common faults and their causes in renewable energy electronic equipment

typical test equipment used to repair electronic and electrical equipment

safe and correct use of tools and test equipment to locate electronic equipment faults under the direction of an electronics technician

replacement of circuit boards observing appropriate handling precautions for static sensitive devices

replacement of socketed ICs such as EPROMs or microprocessors using appropriate tools and methods

Evidence Required

This provides essential advice for assessment of the unit and must be read in conjunction with the performance criteria and the range statement of the unit and the Training Package Assessment Guidelines

The Evidence Guide forms an integral part of this unit It must be used in conjunction with all parts of this unit and performed in accordance with the Assessment Guidelines of this Training Package

Overview of Assessment

Longitudinal competency development approaches to assessment such as Profiling require data to be reliably gathered in a form that can be consistently interpreted over time This approach is best utilised in Apprenticeship programs and reduces assessment intervention It is the industrypreferred model for apprenticeships However where summative or final assessment is used it is to include the application of the competency in the normal work environment or at a minimum the application of the competency in a realistically simulated work environment In some circumstances assessment in part or full can occur outside the workplace However it must be in accordance with industry and regulatory policy

Methods chosen for a particular assessment will be influenced by various factors These include the extent of the assessment the most effective locations for the assessment activities to take place access to physical resources additional safety measures that may be required and the critical nature of the competencies being assessed

The critical safety issues inherent in working with electricity electrical equipment gas or any other hazardous substancematerial present a challenge for those determining competence Sources of evidence need to be rich in nature to minimise error in judgment

Activities associated with normal everyday work have a bearing on the decision as to how much and how detailed the data gathered will contribute to its richness Some skills are more critical to safety and operational requirements while the same skills may be more or less frequently practised These points are raised for the assessors to consider when choosing an assessment method and developing assessment instruments Sample assessment instruments are included for Assessors in the Assessment Guidelines of this Training Package

Critical aspects of evidence required to demonstrate competency in this unit

Before the critical aspects of evidence are considered all prerequisites must be met

Evidence for competence in this unit must be considered holistically Each element and associated performance criteria must be demonstrated on at least two occasions in accordance with the Assessment Guidelines UEE Evidence must also comprise

A representative body of work performance demonstrated within the timeframes typically expected of the discipline work function and industrial environment In particular this must incorporate evidence that shows a candidate is able to

Implement Occupational Health and Safety workplace procedures and practices including the use of risk control measures as specified in the performance criteria and range statement

Apply sustainable energy principles and practices as specified in the performance criteria and range statement

Demonstrate an understanding of the essential knowledge and associated skills as described in this unit It may be required by some jurisdictions that RTOs provide a percentile graded result for the purpose of regulatory or licensing requirements

Demonstrate an appropriate level of skills enabling employment

Conduct work observing the relevant Anti Discrimination legislation regulations polices and workplace procedures

Demonstrated consistent performance across a representative range of contexts from the prescribed items below

Diagnose and rectify faults in renewable energy control systems as described in and including

A

Envisaging the likely extent of work from faultbreakdown reports and discussion with appropriate persons

B

Using methodical fault finding techniques

C

Finding faults efficiently

D

Rectifying faults effectively

E

Completing documentation correctly

F

Dealing with unplanned events by drawing on essential knowledge and skills to provide appropriate solutions incorporated in a holistic assessment with the above listed items

Context of and specific resources for assessment

This unit should be assessed as it relates to normal work practice using procedures information and resources typical of a workplace This should include

OHS policy and work procedures and instructions

Suitable work environment facilities equipment and materials to undertake actual work as prescribed by this unit

These should be part of the formal learningassessment environment

Note

Where simulation is considered a suitable strategy for assessment conditions must be authentic and as far as possible reproduce and replicate the workplace and be consistent with the approved industry simulation policy

The resources used for assessment should reflect current industry practices in relation to diagnosing faults in renewable energy control systems

Method of assessment

This unit shall be assessed by methods given in Volume Part Assessment Guidelines

Note

Competent performance with inherent safe working practices is expected in the Industry to which this unit applies This requires assessment in a structured environment which is intended primarily for learningassessment and incorporates all necessary equipment and facilities for learners to develop and demonstrate the essential knowledge and skills described in this unit

Concurrent assessment and relationship with other units

There are no concurrent assessment recommendations for this unit

The critical aspects of occupational health and safety covered in unit UEENEEEA and other discipline specific occupational health and safety units shall be incorporated in relation to this unit

The critical aspects of occupational health and safety covered in unit UEENEEE101A and other discipline specific occupational health and safety units shall be incorporated in relation to this unit.


Range Statement

10) This relates to the unit as a whole providing the range of contexts and conditions to which the performance criteria apply. It allows for different work environments and situations that will affect performance.

This unit must be demonstrated in relation to finding and repairing any four of the following faults in renewable energy systems:

Open-circuit

Short-circuit

Incorrect connections

Insulation failure

Unsafe condition

Apparatus/component failure

Related mechanical failure

Generic terms used throughout this Vocational Standard shall be regarded as part of the Range Statement in which competency is demonstrated. The definition of these and other terms that apply are given in Volume 2, Part 2.1.