- MEM18030B - Diagnose and rectify low voltage electrical systems
Unit of Competency Mapping – Information for Teachers/Assessors – Information for Learners
MEM18030B Mapping and Delivery Guide
Diagnose and rectify low voltage electrical systems
Version 1.0
Issue Date: May 2024
| Qualification | - |
Unit of Competency | MEM18030B - Diagnose and rectify low voltage electrical systems |
|---|---|---|---|
| Description | This unit covers using test instruments, testing the battery, and assessing and rectify wiring faults. | ||
| Employability Skills | This unit contains employability skills. | ||
| Learning Outcomes and Application | This unit applies to testing and rectification activities associated with 12, 24 and 36 volt wiring systems on vehicles, plant and stationary equipment. The system extends to wiring, switching mechanisms and circuit protection devices.This unit should not be selected with any of the following Units: Unit MEM18045B (Fault find/repair electrical equipment/components up to 250 volts single phase supply), or Unit MEM18046B (Fault find/repair electrical equipment/components up to 1000 volts a.c./1500 volts d.c. Except in exceptional circumstances this unit should not be selected with Unit MEM18056B (Diagnose and repair analog equipment and components) or Unit MEM18066B (Diagnose and repair microprocessor based equipment).If soldering of wires/connections is required, see Unit MEM05001B (Perform manual soldering/desoldering - electrical/electronic components).Band: AUnit Weight: 8 | ||
| Duration and Setting | X weeks, nominally xx hours, delivered in a classroom/online/blended learning setting. |
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| Prerequisites/co-requisites | Path 1MEM09002B Interpret technical drawing MEM12023A Perform engineering measurements MEM18001C Use hand tools MEM18002B Use power tools/hand held operations MEM18055B Dismantle, replace and assemble engineering components | ||
| Competency Field | Maintenance and diagnostics | ||
| Development and validation strategy and guide for assessors and learners | Student Learning Resources | Handouts Activities |
Slides PPT |
Assessment 1 | Assessment 2 | Assessment 3 | Assessment 4 | |
|---|---|---|---|---|---|---|---|---|
| Elements of Competency | Performance Criteria | |||||||
| Element: Use test instruments |
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| Element: Test battery |
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| Element: Assess and rectify wiring faults |
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Evidence Required
List the assessment methods to be used and the context and resources required for assessment. Copy and paste the relevant sections from the evidence guide below and then re-write these in plain English.
The evidence guide provides advice on assessment and must be read in conjunction with the performance criteria, required skills and knowledge, range statement and the Assessment Guidelines for the Training Package. | |
Overview of assessment | A person who demonstrates competency in this unit must be able to test and rectify low voltage electrical systems. Competency in this unit cannot be claimed until all prerequisites have been satisfied. |
Critical aspects for assessment and evidence required to demonstrate competency in this unit | Assessors must be satisfied that the candidate can competently and consistently perform all elements of the unit as specified by the criteria, including required knowledge, and be capable of applying the competency in new and different situations and contexts. |
Context of and specific resources for assessment | This unit may be assessed on the job, off the job or a combination of both on and off the job. Where assessment occurs off the job, that is the candidate is not in productive work, then an appropriate simulation must be used where the range of conditions reflects realistic workplace situations. The competencies covered by this unit would be demonstrated by an individual working alone or as part of a team. The assessment environment should not disadvantage the candidate. This unit could be assessed in conjunction with any other units addressing the safety, quality, communication, materials handling, recording and reporting associated with testing and rectifying low voltage electrical systems or other units requiring the exercise of the skills and knowledge covered by this unit. |
Method of assessment | Assessors should gather a range of evidence that is valid, sufficient, current and authentic. Evidence can be gathered through a variety of ways including direct observation, supervisor's reports, project work, samples and questioning. Questioning techniques should not require language, literacy and numeracy skills beyond those required in this unit of competency. The candidate must have access to all tools, equipment, materials and documentation required. The candidate must be permitted to refer to any relevant workplace procedures, product and manufacturing specifications, codes, standards, manuals and reference materials. |
Guidance information for assessment | |
Submission Requirements
List each assessment task's title, type (eg project, observation/demonstration, essay, assignment, checklist) and due date here
Assessment task 1: [title] Due date:
(add new lines for each of the assessment tasks)
Assessment Tasks
Copy and paste from the following data to produce each assessment task. Write these in plain English and spell out how, when and where the task is to be carried out, under what conditions, and what resources are needed. Include guidelines about how well the candidate has to perform a task for it to be judged satisfactory.
Required skills |
Look for evidence that confirms skills in: reading, interpreting and following information on written job instructions, specifications, standard operating procedures, charts, lists, drawings and other applicable reference documents planning and sequencing operations checking task-related information checking for conformance to specification selecting and using the correct test instrument for a variety of electrical circuits, to measure the current, voltage and resistance of specified circuit components or sections of circuitry applying Ohm's law to determine the required values of voltage, current and resistance for a range of electrical circuits determining the resistance of series and parallel circuits connecting electrical test instruments into given circuits to determine the required values of current, voltage and resistance connecting and adjusting a general purpose oscilloscope to a given electrical circuit to measure wave forms at nominated points in the circuit determining the specific gravity of the electrolyte for temperature variations preparing dry batteries for charging and recharging performing discharge testing of batteries testing given electrical circuits and, where appropriate, identifying wiring faults using supplier catalogues making up wiring looms terminating wiring removing and/or neutralising corrosion from terminals and connections, and applying appropriate protective coatings testing a range of circuit components for correct operation and identifying and repairing faulty circuit components |
Required knowledge |
Look for evidence that confirms knowledge of: the principles of electron theory definitions of current, voltage and resistance in terms of electrical circuits the relationships between current, voltage and resistance for a variety of given electrical circuits the instruments and procedures to be used to measure current, voltage and resistance the procedures for maintaining electrical test equipment the function of a variety of electrical circuits identified from given electrical drawings/diagrams the symbols used in electrical drawings/diagrams the components of a variety of electrical circuits identified by given electrical drawings/diagrams the differences between series and parallel electrical circuits the function of a general purpose oscilloscope and procedures for connecting a general purpose oscilloscope into given electrical circuits the use of wave forms in the testing of electrical circuits the accuracy to which a range of electrical test equipment can be read the procedures for using multipliers and shunts in the measurement of electrical circuits the operation of a chemical battery the function of the electrolyte in batteries the procedures for measuring the specific gravity of the electrolyte the effect of temperature on the specific gravity of the electrolyte the procedures for preparing dry batteries for charging the procedures for recharging batteries hazards and control measures associated with charging/recharging of batteries and discharge testing, including housekeeping the purpose and procedures for discharge testing of batteries the specifications applied to batteries examples and causes of common faults in electrical wiring the test procedures for isolating wiring faults the specifications of cables and wires used in given electrical circuits the specification of the insulation materials the procedures for making up and fixing wiring looms can be given. the procedures for stripping, fitting and preparing wiring terminations the procedures for soft and hard soldering/crimping of wiring terminations the effect of corrosion on the performance of electrical circuits and connections the procedures for corrosion removal and/or neutralisation coatings available to stop/inhibit corrosion the correct operational relays, solenoids and contacts common faults and causes in relays, solenoids, contacts and circuits the procedures for testing circuit components safe work practices and procedures |
The range statement relates to the unit of competency as a whole. It allows for different work environments and situations that may affect performance. Bold italicised wording, if used in the performance criteria, is detailed below. Essential operating conditions that may be present with training and assessment (depending on the work situation, needs of the candidate, accessibility of the item, and local industry and regional contexts) may also be included. | |
Test instruments | Multimeters, amp meters, circuit testers |
Copy and paste from the following performance criteria to create an observation checklist for each task. When you have finished writing your assessment tool every one of these must have been addressed, preferably several times in a variety of contexts. To ensure this occurs download the assessment matrix for the unit; enter each assessment task as a column header and place check marks against each performance criteria that task addresses.
Observation Checklist
| Tasks to be observed according to workplace/college/TAFE policy and procedures, relevant legislation and Codes of Practice | Yes | No | Comments/feedback |
|---|---|---|---|
| Electron theory, current, voltage and resistance principles are understood. | |||
| Appropriate test instruments are selected, used and maintained to determine current, voltage and resistance. | |||
| Electrical drawings and manufacturers' diagrams are correctly interpreted. | |||
| Series, parallel and series parallel circuits are correctly determined. | |||
| Basic electrical laws are understood and correctly applied. | |||
| AVR test instruments are correctly connected into circuits. | |||
| Meters are read to standard accuracy; and wave form and quantities are determined using general purpose oscilloscope. | |||
| Multipliers and shunts are correctly used and applied. | |||
| Chemical battery operating principles are understood. | |||
| Electrolyte level is correctly determined and specific gravity readings temperature is corrected. | |||
| Dry charge preparation and recharging of batteries is carried out correctly. | |||
| Discharge testing is performed according to prescribed procedures. | |||
| Replacement batteries are correctly selected for application. | |||
| Wiring faults are correctly isolated. | |||
| Replacement cables/wires are correctly sized. | |||
| Insulation quality is correctly determined. | |||
| Wiring looms are correctly made up for application and securely fixed. | |||
| Wiring terminations are stripped, fitted, prepared and made correctly. | |||
| Corrosion is removed, neutralised and appropriate protective coating is applied. | |||
| Relays, solenoids, contacts and circuits are correctly tested and repaired/replaced. |
Forms
Assessment Cover Sheet
MEM18030B - Diagnose and rectify low voltage electrical systems
Assessment task 1: [title]
Student name:
Student ID:
I declare that the assessment tasks submitted for this unit are my own work.
Student signature:
Result: Competent Not yet competent
Feedback to student
Assessor name:
Signature:
Date:
Assessment Record Sheet
MEM18030B - Diagnose and rectify low voltage electrical systems
Student name:
Student ID:
Assessment task 1: [title] Result: Competent Not yet competent
(add lines for each task)
Feedback to student:
Overall assessment result: Competent Not yet competent
Assessor name:
Signature:
Date:
Student signature:
Date: