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Elements and Performance Criteria

1. Prepare to diagnose and rectify a.c. motor drive system faults
   • WHS/OHS processes and workplace procedures for a given work area are identified, obtained and applied
2. Hazards are identified, WHS/OHS risks assessed, and control measures and workplace procedures are implemented in preparation for work
3. Safety hazards that have not previously been identified are documented on job safety assessments and risk control measures devised and implemented in consultation with relevant person/s
4. Scope of fault/s is determined from fault report/s, relevant documentation and in consultation with relevant person/s
5. Relevant person/s is consulted to ensure work is coordinated effectively with others involved on the worksite
6. Tools, equipment and testing devices needed to diagnose faults are obtained in accordance with workplace procedures and checked for correct operation and safety
7. Diagnose and rectify a.c. motor drive system fault/s
   • WHS/OHS risk control measures and workplace procedures for carrying out work are followed
8. Need to inspect, test or measure live work is determined and conducted in accordance with WHS/OHS requirements and workplace procedures, as required
9. Circuits/machines/plant are inspected, checked and isolated, as required, in accordance with WHS/OHS requirements and workplace procedures
10. Logical diagnostic methods/techniques are applied to diagnose a.c. motor control system faults employing measurements and estimations of system operating parameters referenced to system operational requirements
11. Fault scenarios are tested and confirmed as being the source of system problems in accordance with workplace procedures
12. Causes of the faults are identified and relevant person/s identified to rectify the fault, as required, outside the scope of the a.c. motor drive control system
13. Faults in the control components of the system are rectified in accordance with a.c. motor control system operation standards
14. System is inspected and tested to verify that the system operates as intended and to specified requirements
15. Decisions for dealing with unplanned situations are determined from discussions with relevant person/s, job specifications and requirements
16. Methods for dealing with unplanned situations are selected on the basis of safety and specified work outcomes
17. Diagnosis and rectification activities are carried out efficiently, without unnecessary waste of materials or damage to apparatus, the surrounding environment or services using sustainable energy practices
18. Complete and report fault diagnosis and rectification activities
    • WHS/OHS work completion risk control measures and workplace procedures are followed
19. Worksite is made safe in accordance with workplace safety procedures
20. Rectification of faults is documented in accordance with workplace procedures
21. Relevant person/s is notified in accordance with workplace procedures that the system faults have been rectified

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.
Diagnosing and rectifying faults in a.c. motor drive systems must include at least four of the following:	faults in systems controlling starting, speed, torque, power output, efficient running and braking a.c. motor drive system

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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 logical diagnostic methods applying problem-solving techniques applying relevant work health and safety (WHS)/occupational health and safety (OHS) requirements, including: implementing workplace procedures and practices using of risk control measures applying sustainable energy principles and practices completing and reporting fault diagnosis and rectification activities dealing with unplanned events/situations in accordance with workplace procedures in a manner that minimises risk to personnel and equipment documenting fault rectification activities and outcomes in accordance with workplace procedures identifying faults and determining components needed to rectify them inspecting, testing and verifying that the alternating current (a.c.) electrical system operates correctly preparing to diagnose and rectify faults in a.c. motor drive system rectifying faults in a.c. motor drive system controls using fault scenarios to test the cause of system faults.

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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:

relevant job safety assessments or risk mitigation processes relevant manufacturer specifications relevant problem-solving techniques relevant WHS/OHS legislated requirements relevant workplace documentation relevant workplace policies and procedures variable speed drive (VSD) systems for a.c. motors, including: methods and operating principles installation requirements filtering performance characteristics set-up and commissioning common faults, their symptoms and causes.

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