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Elements and Performance Criteria

1. Prepare to rewind d.c. machine
   • Work health and safety (WHS)/occupational health and safety (OHS) requirements and workplace procedures for a given work area are identified and applied
2. Existing WHS/OHS risk control measures for work preparation are followed
3. Scope of work is determined from job specifications and regulatory requirements
4. Advice is sought from the work supervisor to ensure the work is coordinated effectively with others
5. Winding data is obtained from winding data records or directly from measurements of stator and recorded in accordance with workplace procedures
6. Materials required for the work are obtained in accordance with workplace procedures and job specification
7. Tools, equipment and testing devices needed to carry out work are obtained and checked for correct operation and safety
   • Existing WHS/OHS risk control work measures are followed
8. Machines/equipment are checked and isolated in accordance with WHS/OHS requirements and workplace procedures
9. Induction machine is dismantled and parts tagged and stored to prevent loss or damage in accordance with workplace procedures and instructions
10. Winding is stripped from stator in accordance with workplace procedures
11. Armature and fields are wound and insulated in accordance with winding data, job specifications and workplace procedures
12. Machine is assembled and prepared for inspection and testing in accordance with workplace procedures
13. Unplanned situations are responded to in accordance with workplace procedures in a manner that minimises risk to personnel and equipment
14. Routine quality checks are conducted to ensure coils are correctly wound, with correct wire, number of turns and shape in accordance with workplace procedures and job specifications
15. Electrical coil work is completed in timeframe, environment and workplace conditions
16. Complete workplace reports
    • WHS/OHS work completion risk control measures are followed
17. Workplace report, forms/data sheets are completed accurately 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.
Dismantling and winding armatures and field coils must include the following:	three different d.c. machines in an environment designed specifically for the purpose

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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 and workplace procedures and practices, including using risk control measures applying sustainable energy principles and practices completing workplace reports and documentation dealing with unplanned events in accordance with workplace procedures in a manner that minimises risk to personnel and equipment inspecting and testing of completed machine work planning to rewind low voltage (LV) direct current (d.c.) machines rewinding d.c. machines rated for LV, including: adhering to quality workplace procedures assembling machine and preparing for testing completing workplace reports/forms accurately dismantling machine and storing parts securely following winding specifications preparing stator for winding selecting correct coils and insulation winding and connecting armature and fields correctly checking dimensions using tools safely in accordance with workplace procedures.

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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:

commutation and interpoles, including: conditions for sparkless commutation and methods used to reduce sparking interpoles or commutating poles principles of commutation and advantages of interpoles resistance and electromagnetic field commutation current industry practices and technologies d.c. motor winding techniques calculations and insulation specifications, including: calculation of a half coil length and the amount of copper required commutators and identification of insulation specifications preparation of coils and equalisers preparation of copper prior to insulating coils and equalisers on armatures commutation and interpoles critical details and measurements when stripping a stator of a d.c. machine, including: lap winding with equalisers types of windings wave winding winding layout d.c. armature windings, including: lap and wave windings, progressive and retrogressive windings terms preparation for rewinding, including: checking the condition of a stripped core core loss test hot spots in armature core testing commutator before use removing of old winding principles and construction, including: construction of d.c. machine d.c. machine types types of armature windings, including parallel circuits value of generated electromagnetic field procedures and precautions required when inspecting, testing and/or re-using a commutator, including: coil position and commutator segment relationship commutator wear ring removal of armature leads on tungsten inert gas (TIG) welded commutator TIG welded and soft soldered commutators selection of appropriate insulation, including: B stage and VPI insulation dielectric strength, temperature rating, insulation properties, method of application and specific uses insulations used on the slot portion and overhang manufacturer recommendations reason for selecting a particular insulation simplex armature lap windings and wave windings, including: characteristics and applications commutator pitch number and position of brushes electrical power systems LV identification of insulation specifications relevant job safety assessments or risk mitigation processes relevant manufacturer specifications relevant safe working practices relevant WHS/OHS legislated requirements relevant workplace documentation relevant workplace policies and procedures simplex lap windings, including equalising connections for armature windings simplex wave windings, including dummy coils, comparison of lap and wave windings, and armature winding calculations sustainable energy principles and practices testing techniques, including continuity, insulation testing, use of ‘growler’ and magnetic field testing.

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