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Elements and Performance Criteria

1. Identify problems in polyphase electronic power control circuits
   • WHS/OHS requirements and workplace procedures are identified and applied
2. Hazards are identified, risks are assessed and control measures implemented
3. Extent of polyphase electronic power control problems are determined from performance specifications, situation reports and consultations with relevant person/s
4. Work activities are planned to meet scheduled timelines in consultation with relevant person/s
5. Tools, equipment and testing devices needed for work are obtained in accordance with workplace procedures and checked for correct operation and safety
6. Solve problems in polyphase electronic power control circuits
   • WHS/OHS risk control measures and workplace procedures for carrying out the work are followed
7. Polyphase electronic power control devices, circuit operation characteristics and applications are applied to developing solutions to control problems
8. Parameters, specifications and performance requirements in relation to each polyphase electronic power control problem are obtained in accordance with workplace procedures
9. Solutions to polyphase electronic power control problems are evaluated to determine most effective resolution
10. Unplanned situations are responded to in accordance with workplace procedures in a manner that minimises risk to personnel and equipment
11. Problems are resolved using sustainable energy practices and principles without wasting materials, damaging apparatus, the surrounding environment or services in accordance with workplace procedures
12. Test and document solutions to polyphase electronic power control problems
    • WHS/OHS risk control measures and procedures for carrying out the work are followed
13. Solutions to polyphase electronic power control problems are tested to determine effectiveness and modified, as required
14. Solutions are documented, including instructions for implementation, incorporating risk control measures
15. Solutions used to solve polyphase electronic power control problems are justified and documented 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.
Solving electrical problems in polyphase electronic power control circuits must include at least four of the following:	polyphase electronic power control circuits

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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 implementing risk control measures applying sustainable energy principles and practices dealing with unplanned events/situations in accordance with workplace procedures in a manner that minimises risk to personnel and equipment determining the extent of the polyphase electronic power control problem developing, evaluating and testing solutions to polyphase electronic power control problem documenting justification of solutions implemented in accordance with workplace procedures following scheduled timeframes obtaining electronic device and circuit parameters, specifications and performance requirements appropriate to each problem resolving problems in polyphase electronic power control circuits testing and documenting solutions to polyphase electronic power control circuits.

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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:

job safety assessments or risk mitigation processes, including risk control measures three phase rectifier circuits, including: three phase circuit configurations resistive/inductive loads output voltages/waveforms ripple voltage/frequency peak reverse voltages freewheeling diodes measurement of rectifier output parameters three phase half wave-controlled rectifiers, including: phase control purpose/operation of half wave-controlled rectifiers circuit configuration rectifier performance and operation - resistive loads output voltage resistive load rectifier performance and operation - inductive loads rectifier output waveforms applications and limitations advantages and disadvantages three phase half wave-controlled rectifiers three phase half-controlled bridge rectifier, including: purpose/operation of a half-controlled bridge rectifiers circuit configuration and connections rectifier output - resistive loads output voltage resistive loads rectifier output - inductive loads output voltage - inductive loads flywheel diode output voltage calculations applications and limitations advantages and disadvantages three phase half-controlled bridge rectifiers three phase fully controlled bridge rectifier, including: purpose/operation of a fully controlled bridge rectifiers circuit configuration and connections rectifier output - resistive loads output voltage resistive loads rectifier output - inductive loads output voltage - inductive loads flywheel diode output voltage calculations applications and limitations advantages and disadvantages three phase fully controlled bridge rectifiers three phase alternating current (a.c.) controllers, including: circuit configurations circuit operation triacs and silicon controlled rectifier (SCR) circuits triggering requirements output voltage and waveforms determination of output voltage applications advantages and disadvantages direct current (d.c.) converters, including: purpose and operation of d.c. converters circuit configurations voltage control methods forced commutation methods calculation of load voltage output voltage/waveforms applications advantages and disadvantages cyclo-converters, including: purpose/operation of a cyclo-converter basic circuit configurations measurement of output voltage calculation of load voltage output voltage/waveforms applications and limitations advantages and disadvantages inverters, including: purpose/operation of an inverter basic circuit configurations measurement of inverter outputs output voltage applications and limitations advantages and disadvantages thyristor protection, including: power control devices failure protection techniques snubber networks series inductors amp trap high rupturing capacity (HRC) fuses gate pulse suppression installation of thyristor devices and circuits, including: need for heat sinking of power thyristor devices heat sink features and types installation methods for all types of thyristor packages basic thermal model, only to demonstrate the effect of different heat sink types and profiles and installation methods on thyristor junction temperature series and parallel thyristor connections, including: purpose of series/parallel connection series connections reasons operational problems parallel connections reasons operational problems fault finding three phase thyristor circuits, including: fault finding procedures typical faults power and trigger circuits characteristics displayed by common faults comparison of test data with expected data (voltage/current waveforms) location and replacement of faulty components problem-solving techniques relevant manufacturer specifications relevant tools, equipment and testing devices relevant WHS/OHS legislated requirements relevant workplace documentation relevant workplace policies and procedures sustainable energy principles and practices.

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