This unit involves the skills and knowledge required to determine the correct operation of independent power supplies and power supply sections of electronic apparatus.

It includes troubleshooting and applying problem-solving procedures; working safely; using voltage, current and resistance measuring devices to measure and calculate; and providing solutions to predictable problems in direct current (d.c.) power supplies with single phase inputs.

No licensing, legislative or certification requirements apply to this unit at the time of publication.

ELEMENTS

PERFORMANCE CRITERIA

Elements describe the essential outcomes.

Performance criteria describe the performance needed to demonstrate achievement of the element.

1

Troubleshoot d.c. power supplies

1.1

Work health and safety (WHS)/occupational health and safety (OHS) procedures for a given work area are obtained and applied

1.2

Nature of d.c. power supplies fault is obtained from documentation or from work supervisor to determine the scope of work to be undertaken

1.3

Advice is sought from work supervisor to ensure work is coordinated effectively with others

1.4

Materials required for the work are determined in accordance with workplace procedures

1.5

Tools, equipment and testing devices required to carry out the work are obtained in accordance with workplace procedures and checked for correct operation and safety

2

Solve d.c. power supply problems

2.1

WHS/OHS risk control work measures and workplace procedures are followed

2.2

Power supply fault finding is approached methodically in accordance with workplace procedures, drawing on knowledge of d.c. power supplies and using measured and calculated values of parameters

2.3

Fault-finding activities are carried out efficiently without unnecessary waste of materials or damage to apparatus, the surrounding environment or services using sustainable energy practices

3

Complete work and document problem-solving activities

3.1

WHS/OHS risk control measures and workplace procedures for work completion are followed

3.2

Worksite is cleaned and made safe in accordance with workplace procedures

3.3

Justification for solutions used to resolve single phase input d.c. power supply problems are documented in accordance with workplace procedures

3.4

Work completion is documented and appropriate person/s notified in accordance with workplace procedures

Evidence required to demonstrate competence in this unit must be relevant to and satisfy all of the requirements of the elements, performance criteria and range of conditions on at least two separate occasions and include:

applying relevant work health and safety (WHS)/occupational health and safety (OHS) requirements, including:

using risk control measures

checking tools, materials, equipment and testing devices for correct operation and safety

testing or measuring on live and operating system safely

ensuring circuits are isolated

communicating effectively with relevant stakeholders

completing work and required documentation

maintaining a clean worksite and equipment

referring to relevant documentation to determine the fault

solving direct current (d.c.) power supply problems

troubleshooting d.c. power supplies with single phase input, including:

using methodical problem-solving methods

providing written justification for the solutions to d.c. power supplies problems

dealing with unplanned events in accordance with workplace procedures

taking measurements correctly and accurately

calculating parameters correctly and accurately

providing solution to power supply problems.

Evidence required to demonstrate competence in this unit must be relevant to and satisfy all of the requirements of the elements, performance criteria and range of conditions and include knowledge of:

power supplies operating principles and applications, including:

block diagram identifying each sub-system

constant voltage and current

expected waveforms in a power supply

power supply function

d.c. rectification circuits, including:

dual rail supply

half wave and full wave rectifiers

junction diode characteristics

transformer turns ratio and losses

filter circuits, including:

capacitive and inductive filters

ripple

zener diode regulator, including:

load and line regulation definitions

operating parameters and data sheets

zener shunt regulator circuit

three terminal regulator circuits, including:

line and load regulation

need for regulation

regulated power efficiency

remote voltage sensing

short circuit protection

three terminal regulator characteristics and faults

electronic testing and measuring devices and techniques, including:

test/measuring devices and their application, including:

multimeters

signal generators and oscilloscopes

voltage and digital testers

connection of test/measuring devices into a circuit, including:

circuit arrangement of test/measuring devices

safety procedures

taking readings

storage, maintenance and care of test/measuring devices

d.c. power supply testing and fault-finding including:

rectifier diode faults

zener diode faults

three terminal regulator faults

capacitor faults

safe working practices and relevant standards, codes and regulations.

Assessors must hold credentials specified within the Standards for Registered Training Organisations current at the time of assessment.

Assessment must satisfy the Principles of Assessment and Rules of Evidence and all regulatory requirements included within the Standards for Registered Training Organisations current at the time of assessment.

Assessment must occur in workplace operational situations where it is appropriate to do so; where this is not appropriate, assessment must occur in simulated workplace operational situations that replicate workplace conditions.

Assessment processes and techniques must be appropriate to the language, literacy and numeracy requirements of the work being performed and the needs of the candidate.

Resources for assessment must include access to:

a range of relevant exercises, case studies and/or other simulations

relevant and appropriate materials, tools, equipment and personal protective equipment (PPE) currently used in industry

applicable documentation, including workplace procedures, equipment specifications, regulations, codes of practice and operation manuals.

Foundation skills essential to performance are explicit in the performance criteria of this unit of competency.

Range is restricted to essential operating conditions and any other variables essential to the work environment.

Non-essential conditions may be found in the UEE Electrotechnology Training Package Companion Volume Implementation Guide.

Troubleshooting d.c. power supply problems must include:

single phase input on the rectification section

filtering section of a half wave and full wave rectifiers

Electrotechnology

Electronics and Communications