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Elements and Performance Criteria

1. Troubleshoot d.c. power supplies
   • Work health and safety (WHS)/occupational health and safety (OHS) procedures for a given work area are obtained and applied
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
3. Advice is sought from work supervisor to ensure work is coordinated effectively with others
4. Materials required for the work are determined in accordance with workplace procedures
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
6. Solve d.c. power supply problems
   • WHS/OHS risk control work measures and workplace procedures are followed
7. 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
8. 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
9. Complete work and document problem-solving activities
   • WHS/OHS risk control measures and workplace procedures for work completion are followed
10. Worksite is cleaned and made safe in accordance with workplace procedures
11. Justification for solutions used to resolve single phase input d.c. power supply problems are documented in accordance with workplace procedures
12. Work completion is documented and appropriate person/s notified in accordance with workplace procedures

Range Statement

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

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Performance Evidence

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.

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Knowledge Evidence

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.

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