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Elements and Performance Criteria

1. Prepare to develop engineering solution for induction machine problems
   • Work health and safety (WHS)/occupational health and safety (OHS) processes and workplace procedures for a given work area are identified, obtained and applied
2. WHS/OHS risk control measures and workplace procedures in preparation for the work are followed
3. Scope of induction machine problem is determined from performance specifications and/or documentation and in consultation with relevant person/s
4. Activities are planned to meet scheduled timelines in consultation with others involved in the work
5. Strategies are formed to ensure solution development and implementation is carried out efficiently
6. Develop engineering solution
   • WHS/OHS risk control measures and workplace procedures for carrying out the work are followed
7. Induction machine construction, operation, characteristics and applications are applied to developing solutions to induction machine problems
8. Parameters tested, data taken, specifications and performance requirements to each machine problem are obtained in accordance with workplace procedures
9. Approaches to resolving induction machine problems are analysed to provide most effective solutions
10. Unplanned events are dealt with safely and effectively in accordance with relevant industry standards and workplace procedures
11. Quality of work is monitored in accordance with relevant industry standards and workplace procedures
12. Implement engineering solution and complete documentation
    • Solutions to machine problems are tested to determine their effectiveness and modified as required
13. Adopted solutions are documented, including instruction for implementation with risk control measures
14. Relevant person/s required to implement solutions to induction machine problems is coordinated in accordance with relevant industry standards and workplace procedures
15. Justification for solutions used to solve induction machine problems is documented in work/project records in accordance with relevant industry standards

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.
Developing engineering solutions must include the following:	at least two induction machine problems

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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 one occasion and include:

understanding the extent of the machine problem forming effective strategies for solution development and implementation obtaining machine parameters, specifications and performance requirements appropriate to each problem testing and solutions to machine problems documenting instruction for implementation of solutions that incorporate risk control measure to be followed documenting justification of solutions implemented in accordance with professional standards dealing with unplanned events analysing approaches to solutions applying relevant work health and safety (WHS)/occupational health and safety (OHS) requirements, including using risk control measures determining the scope of induction machine problems monitoring quality of work planning activities to meet timelines.

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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:

induction machines diagnostics and engineering solutions for induction motor problems, including: operating principles of polyphase induction motors encompassing: rotating magnetic field torque slip MMF relationships leakage fluxes construction of polyphase induction motors encompassing: squirrel cage motors slip-ring motors construction considerations in minimisation of tooth locking speed-torque relationships in induction motors encompassing: maximum torque torque – slip relationships squirrel cage rotor types power flow in the motors power distribution torque units slip ring rotors induction motor performance testing encompassing: no-load tests locked rotor tests development of motor equivalent circuit from test results analysis of motor performance using circle diagrams induction motor starters encompassing: starting requirements type of starters starting torque starting dynamics static friction mechanical loads starting duration reduced voltage starting encompassing: starting dynamics change over conditions starting duration acceleration curves speed control of induction motors encompassing: constant torque, constant power concepts torque-flux-voltage relationships rotor resistance control stator impedance control variable frequency control (e.g. PAM, PWM and flux vector control) braking of induction motors encompassing: electrical braking systems (plugging, direct current (d.c.) dynamic, regenerative and capacitor-magnetic) mechanical braking systems (mechanical drum, demag and eddy current) motor protection encompassing: overload earth fault phase failure motor selection criteria and RMS rating induction motor maintenance/repair encompassing: routine maintenance schedules type of repairs (mechanical and electrical) single phase induction motors encompassing: operating principles (especially RMF) construction types speed-torque relationships testing relevant induction machine construction, operation, characteristics and applications, including driven load and duty cycle relevant machine parameters, specifications and performance requirements relevant manufacturer specifications and operating instructions/manuals relevant job safety assessments or risk mitigation processes relevant WHS/OHS legislated requirements relevant workplace documentation relevant workplace quality, instructions, policies and procedures.

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