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Evidence Guide: UEENEEJ153A - Find and rectify faults in motors and associated controls in refrigeration and air conditioning systems

Student: __________________________________________________

Signature: _________________________________________________

Tips for gathering evidence to demonstrate your skills

The important thing to remember when gathering evidence is that the more evidence the better - that is, the more evidence you gather to demonstrate your skills, the more confident an assessor can be that you have learned the skills not just at one point in time, but are continuing to apply and develop those skills (as opposed to just learning for the test!). Furthermore, one piece of evidence that you collect will not usualy demonstrate all the required criteria for a unit of competency, whereas multiple overlapping pieces of evidence will usually do the trick!

From the Wiki University

 

UEENEEJ153A - Find and rectify faults in motors and associated controls in refrigeration and air conditioning systems

What evidence can you provide to prove your understanding of each of the following citeria?

Prepare to find and rectify faults

  1. OHS procedures for a given work area are identified, obtained and understood
  2. OHS risk control measures and procedures in preparation for the work are followed.
  3. The likely extent of work to be undertaken is envisaged from fault/breakdown reports and/or discussions with appropriate person(s).
  4. Advice is sought from the work supervisor to ensure the work is coordinated effectively with others.
  5. Sources of materials that may be required for the work are accessed in accordance with established procedures.
  6. Tools, equipment and testing devices needed to locate faults are obtained in accordance with established procedures and checked for correct operation and safety.
OHS procedures for a given work area are identified, obtained and understood

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

OHS risk control measures and procedures in preparation for the work are followed.

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

The likely extent of work to be undertaken is envisaged from fault/breakdown reports and/or discussions with appropriate person(s).

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Advice is sought from the work supervisor to ensure the work is coordinated effectively with others.

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Sources of materials that may be required for the work are accessed in accordance with established procedures.

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Tools, equipment and testing devices needed to locate faults are obtained in accordance with established procedures and checked for correct operation and safety.

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Find and repair faults

  1. OHS risk control measures and procedures for carrying out the work are followed.
  2. The need to test or measure live is determined in strict accordance with OHS requirements and when necessary conducted within established safety procedures
  3. Equipment is checked as being correctly isolated where necessary in strict accordance OHS requirements and procedures
  4. Safety hazards resulting from the fault or breakdown are documented and risk control measures devised and implemented in consultation with appropriate personnel.
  5. Fault finding is approached methodically drawing on knowledge of refrigeration and air conditioning motors and their controls using measured and calculated values of circuit/motor parameters.
  6. Equipment is dismantled where necessary and parts stored to protect them against loss or damage
  7. Suspected faulty motor, component or circuit is rechecked and its fault status confirmed.
  8. Replacement parts required to rectify faults are sourced and obtained in accordance with established procedures.
  9. Effectiveness of the repair is tested in accordance with established procedures.
  10. Apparatus is reassembled, finally tested and prepared for return to service.
  11. Unexpected situations are dealt with safely and with the approval of an authorised person.
  12. Fault finding and repair activities are carried out without damage to apparatus, circuits, the surrounding environment or services and using sustainable energy practices.
OHS risk control measures and procedures for carrying out the work are followed.

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

The need to test or measure live is determined in strict accordance with OHS requirements and when necessary conducted within established safety procedures

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Equipment is checked as being correctly isolated where necessary in strict accordance OHS requirements and procedures

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Safety hazards resulting from the fault or breakdown are documented and risk control measures devised and implemented in consultation with appropriate personnel.

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Fault finding is approached methodically drawing on knowledge of refrigeration and air conditioning motors and their controls using measured and calculated values of circuit/motor parameters.

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Equipment is dismantled where necessary and parts stored to protect them against loss or damage

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Suspected faulty motor, component or circuit is rechecked and its fault status confirmed.

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Replacement parts required to rectify faults are sourced and obtained in accordance with established procedures.

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Effectiveness of the repair is tested in accordance with established procedures.

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Apparatus is reassembled, finally tested and prepared for return to service.

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Unexpected situations are dealt with safely and with the approval of an authorised person.

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Fault finding and repair activities are carried out without damage to apparatus, circuits, the surrounding environment or services and using sustainable energy practices.

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Completion and report fault finding and repair activities

  1. OHS work completion risk control measures and procedures are followed.
  2. Reusable, faulty or worn components are tagged and dispatched for repair to maintain adequate spares inventory.
  3. Maintenance work activities are documented in accordance with established procedures. (See Note)
OHS work completion risk control measures and procedures are followed.

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Reusable, faulty or worn components are tagged and dispatched for repair to maintain adequate spares inventory.

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Maintenance work activities are documented in accordance with established procedures. (See Note)

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Note.Examples of documentation are component faults reports, test results, authorisations, permits, parts/component dispatch and stores records.

Completed
Date:

Teacher:		 Evidence:

 

 

 

 

 

 

 

Assessed

Teacher: ___________________________________ Date: _________

Signature: ________________________________________________

Comments:

 

 

 

 

 

 

 

 

Instructions to Assessors

Evidence Guide

9) The evidence guide provides advice on assessment and must be read in conjunction with the Performance Criteria, Required Skills and Knowledge, the Range Statement and the Assessment Guidelines for this Training Package. .

The Evidence Guide forms an integral part of this Unit. It must be used in conjunction with all parts of this unit and performed in accordance with the Assessment Guidelines of this Training Package.

Overview of Assessment

9.1)

Longitudinal competency development approaches to assessment, such as Profiling, require data to be reliably gathered in a form that can be consistently interpreted over time. This approach is best utilised in Apprenticeship programs and reduces assessment intervention. It is the industry-preferred model for apprenticeships. However, where summative (or final) assessment is used it is to include the application of the competency in the normal work environment or, at a minimum, the application of the competency in a realistically simulated work environment. In some circumstances, assessment in part or full can occur outside the workplace. However, it must be in accordance with industry and regulatory policy.

Methods chosen for a particular assessment will be influenced by various factors. These include the extent of the assessment, the most effective locations for the assessment activities to take place, access to physical resources, additional safety measures that may be required and the critical nature of the competencies being assessed.

The critical safety nature of working with electricity, electrical equipment, gas or any other hazardous substance/material carries risk in deeming a person competent. Sources of evidence need to be 'rich' in nature to minimise error in judgment.

Activities associated with normal everyday work influence decisions about how/how much the data gathered will contribute to its 'richness'. Some skills are more critical to safety and operational requirements while the same skills may be more or less frequently practised. These points are raised for the assessors to consider when choosing an assessment method and developing assessment instruments. Sample assessment instruments are included for Assessors in the Assessment Guidelines of this Training Package.

Critical aspects of evidence required to demonstrate competency in this unit

9.2)

Before the critical aspects of evidence are considered all prerequisites must be met.

Evidence for competence in this unit shall be considered holistically. Each Element and associated performance criteria shall be demonstrated on at least two occasions in accordance with the 'Assessment Guidelines - UEE07 '. Evidence shall also comprise:

A representative body of work performance demonstrated within the timeframes typically expected of the discipline, work function and industrial environment. In particular this shall incorporate evidence that shows a candidate is able to:

Implement Occupational Health and Safety workplace procedures and practices including the use of risk control measures as specified in the performance criteria and range statement

Apply sustainable energy principles and practices as specified in the performance criteria and range statement

Demonstrate an understanding of the essential knowledge and associated skills as described in this unit. It may be required by some jurisdictions that RTOs provide a percentile graded result for the purpose of regulatory or licensing requirements.

Demonstrate an appropriate level of skills enabling employment

Conduct work observing the relevant Anti Discrimination legislation, regulations, polices and workplace procedures

Demonstrated consistent performance across a representative range of contexts from the prescribed items below:

Find and rectify faults in refrigeration and air conditioning system motors and associated controls as described in 8) and including:

A

Envisaging the likely extent of work from fault/breakdown reports and discussion with appropriate person(s)

B

Using methodical fault finding techniques

C

Finding faults efficiently

D

Rectifying faults effectively

E

Completing documentation correctly

F

Dealing with unplanned events by drawing on essential knowledge and skills to provide appropriate solutions incorporated in the holistic assessment with the above listed items

Context of and specific resources for assessment

9.3)

This unit should be assessed as it relates to normal work practice using procedures, information and resources typical of a workplace. This should include:

OHS policy and work procedures and instructions.

Suitable work environment, facilities, equipment and materials to undertake actual work as prescribed by this unit.

These should be part of the formal learning/assessment environment.

Note:

Where simulation is considered a suitable strategy for assessment, conditions must be authentic and as far as possible reproduce and replicate the workplace and be consistent with the approved industry simulation policy.

Evidence should show demonstrated competency in finding and rectifying faults in appliance motors and associated controls

Method of assessment

9.4)

This unit shall be assessed by methods given in Volume 1, Part 3 'Assessment Guidelines'.

Note:
Competent performance with inherent safe working practices is expected in the Industry to which this unit applies. This requires assessment in a structured environment which is intended primarily for learning/assessment and incorporates all necessary equipment and facilities for learners to develop and demonstrate the essential knowledge and skills described in this unit.

Concurrent assessment and relationship with other units

9.5)

There are no concurrent assessment recommendations for this unit

Required Skills and Knowledge

7) This describes the essential skills and knowledge and their level, required for this unit.

Evidence shall show that knowledge has been acquired of safe working practices and finding and rectifying faults in appliance motors and associated controls.

All knowledge and skills detailed in this unit should be contextualised to current industry practices and technologies.

KS01-EJ153A Refrigeration and air conditioning motors and associated controls

Evidence shall show an understanding of refrigeration and air conditioning motors and associated controls, applying safe working practices and relevant Standards, Codes and Regulations to an extent indicated by the following aspects:

T1 Three phase induction motors

Revise the principles of electromagnetism

Phase sequence

Three phase induction motor action

Induction motor construction

stator construction

rotor construction

Speed and slip

Line and phase voltages

Terminal block markings

Motor nameplate details

Motor rating

Star and Delta connections

Electrical isolation

Electrical testing and fault finding

Rotation reversal

Maintenance requirements

T2 Three phase motor starters

Types of three phase induction motor starters

Direct-on-line motor starters

characteristics, applications and limitations

line and control voltages

connection, testing and fault finding

Other motor starters – characteristics, applications and limitations

Star-delta

Auto-transformer

Part winding

Solid State (soft start)

T3 Three phase motor protection devices

Motor protection

Motor protection devices

star point overloads

Types of protection devices

fuses and circuit breakers

thermal overload

magnetic overload

under voltage and overvoltage relays

electronic motor protection

Isolation devices

Timers

Environmental protection

Fault finding in three phase motor installations

Motor circuit faults

T4 Split phase, single phase motors and starters

Split phase single phase motors

Development of starting torque in split phase induction motors

Winding characteristics

Construction details

Starting

centrifugal switch

current coil relay

solid state relay

Characteristics of a split phase motor

advantages

disadvantage

rating

speed

reversal

Testing and fault finding

T5 Capacitor and shaded pole, single phase motor and starters

Capacitor start motors

Characteristics

Switching mechanism

Applications

Motor reversal

Capacitor start/capacitor run motors

Characteristics

Switching mechanism

Applications

Motor reversal

Permanently split capacitor motors

Characteristics

Applications

Motor reversal

Capacitors

Shaded pole induction motors

Advantages

Disadvantages

Reversal

Applications

Motor faults and fault finding

Capacitor start types

Shaded pole motor type

T6 Series universal, single phase motors

Basic motor principles

Commutation

Electromagnet field system

Reversal

Supply types, a.c. /d.c.

Construction

Characteristics

Applications

Reversal

Faults

Synchronous motor

T7 Single phase motor protection devices

Motor protection

Environmental

Overheating

Thermal overload relay

Thermal disc overload

Internal overload

Protection against open circuit, under voltage and automatic restarting

Testing and fault finding

T8 Single phase motor speed control devices

Speed control methods

Pole changing method

Voltage control method

Inverter

Range Statement

8) This relates to the unit as a whole providing the range of contexts and conditions to which the performance criteria apply. It allows for different work environments and situations that will affect performance.

This unit must be demonstrated in relation to finding and repairing the following faults, in single and/or three phase appliance motors and associated controls in each of three different types of refrigeration and air conditioning systems:

Open-circuit

Short-circuit

Incorrect connections

Insulation failure

Unsafe condition

Motor component failure

Control circuit component failure

Related mechanical failure

Generic terms used throughout this Vocational Standard shall be regarded as part of the Range Statement in which competency is demonstrated. The definition of these and other terms that apply are given in Volume 2, Part 2.1.