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

Evidence shall show that knowledge has been acquired of safe working practices and solve problems in single phase electronic power control systems

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

KSEIA

Single phase electronic power control circuit

Evidence shall show an understanding of single phase electronic power control circuit to an extent indicated by the following aspects

T

Introduction to Power Control

Advantages and benefits of power control

Need for power control and typical applications

Power control methods

Types of solid state switches

Block diagram of a power converter

Power control terminology

Modes of operation

T

Single Phase Power Rectifiers

Single Phase Rectifier Circuit Configurations

ResistiveInductive Loads

Output VoltagesWaveforms

Ripple VoltageFrequency

Peak Reverse Voltages

Free Wheeling Diodes

T

Silicon Controlled Rectifiers SCRs

Construction and Symbol

Basic Operating Principles

Characteristics

Gate Requirements

Commutation

Electrical Ratings

Testing SCRs

Applications

T

Triacs and Gate Turn Off GTO Thyristors

Triac Construction and Symbol

Triac Basic Operating Principles

Triac Characteristics

Triac Triggering Modes

Triac Electrical Ratings

Triac Testing

GTO Construction and Symbol

GTO Basic Operating Principles

GTO Characteristics

GTO Electrical Ratings

Applications for Triac and GTOs

T

Power Transistors BJTs

BJT Construction and Symbol

BJT Basic Operating Principles

BJT Characteristics

BJT Electrical Ratings

BJT Testing

Applications for BJTs

T

Power Field Effect Transistors FET

Types of FETs used for power control

Power FETs Construction and Symbol

FET Basic Operating Principles and Characteristics

IGBT Basic Operating Principles and Characteristics

Power FET Electrical Ratings

Power FET Testing

Applications for Power FETs

T

Triggering Devices Diac

construction and symbol

operating principles

breakover voltage

Unijunction transistors UJTs

construction and symbol

operating principles

intrinsic standoff ratio and peak point voltage

T

Programmable Unijunction Transistors PUTs

construction and symbol

operating principles

programmable standoff ratio

peak point voltage

T

Triggering Circuits

RC Time Constant Circuits

Diac Trigger Circuit Operation

UJT Relaxation Oscillator Circuit Operation

PUT Relaxation Oscillator Circuit

T

Half Wave Controlled Rectification

Phase shift control

Controlled rectifiers

Controlled rectifier power output control

Single Phase HalfWave Controlled Rectifier

Circuit configuration

circuit operation

waveforms

load voltage

applications and limitations

Problems Associated with Phase Shift Control

T

Full Wave Controlled Bridge Rectification

Single phase fullwave controlled bridge rectifier circuit

Output voltage

Output waveforms

Applications and limitations

Advantages and disadvantages

T

Fully Controlled Bridge Rectification

Single phase fully controlled rectifier bridge circuit

Output voltage

Output waveforms

Applications and limitations

Advantages and disadvantages

T

SinglePhase ac Voltage Control

Phase control of ac power

Circuit configurations half and full control circuits

Triggering circuits

Circuit performance and operation on resistive and inductive loads

Output voltage and waveform determination of output voltage using circuit characteristics

Range of control with inductive loads

Triggering problems associated with inductive loads

Applications and limitations

T

Zero Voltage Switching ZVS

Operating principles

Circuit configuration including trigger circuits

Circuit operation and waveforms resistive loads only

Relationship between load power and conduction time

Solid state relays types and ratings

Applications and limitations

T

Fault Finding of Power Control Circuits

Fault finding procedures

Typical faults power and trigger circuits

Characteristics displayed by common faults

Comparison of test data with expected data voltagecurrent waveforms

Location and replacement of faulty components

The evidence guide provides advice on assessment and must be read in conjunction with the Performance Criteria Required Skills and Knowledge the Range Statement and the Assessment Guidelines for this Training Package

The Evidence Guide forms an integral part of this unit It must be used in conjunction with all parts of the 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 must 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 It is recognised that in some circumstances assessment in part or full can occur outside the workplace However it must be in accord 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 nature of working with electricity electrical equipment gas or any other hazardous substancematerial carries risk in deeming a person competent Sources of evidence need to be rich in nature to minimise error in judgment

Activities associated with normal everyday work influence decisions about howhow much 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 shall be met

Evidence for competence in this unit shall be considered holistically Each Element and associated performance criteria shall be demonstrated on at least two occasions in accordance with the Assessment Guidelines UEE Evidence shall 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 shall 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 required skills and knowledge 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

Solve problems in single phase electronic power control systems as described in and including

A

Understanding the extent of the single phase electronic power control problem

B

Obtaining electronic device and circuit parameters specifications and performance requirements appropriate to each problem

C

Testing and solutions to single phase electronic power control problems

D

Documenting justification of solutions implemented in accordance with established procedures

E

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

Note

Successful completion of relevant vendor training may be used to contribute to evidence on which competency is deemed In these cases the alignment of outcomes of vendor training with performance criteria and critical aspects of evidence shall be clearly identified

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 providing solutions to single phase electronic power control problems

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 that the specified required skills and knowledge are assessed in a structured environment which is primarily intended for learningassessment and incorporates all necessary equipment and facilities for learners to develop and demonstrate the required skills and knowledge described in this unit

Concurrent assessment and relationship with other units

For optimisation of training and assessment effort competency development in this unit may be arranged concurrently with unit

UEENEEHA

UEENEEH113A

Troubleshoot amplifiers in an electronic apparatus

OR

UEENEEIA

UEENEEI124A

Fault find and repair analogue circuits and components in electronic control systems

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.