- MEM18031B - Diagnose and rectify low voltage starting systems
Unit of Competency Mapping – Information for Teachers/Assessors – Information for Learners
MEM18031B Mapping and Delivery Guide
Diagnose and rectify low voltage starting systems
Version 1.0
Issue Date: May 2024
| Qualification | - |
Unit of Competency | MEM18031B - Diagnose and rectify low voltage starting systems |
|---|---|---|---|
| Description | This unit covers assessing starting motor operation, and testing and repairing starting motors. | ||
| Employability Skills | This unit contains employability skills. | ||
| Learning Outcomes and Application | This unit covers engine electrical starting systems and would require extensive use of AVR test equipment.If soldering of wires is required, see Unit MEM05001B (Perform manual soldering/desoldering - electrical/electronic components).Band: AUnit Weight: 2 | ||
| 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 MEM18030B Diagnose and repair low voltage electrical systems | ||
| 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: Assess starting motor operation |
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| Element: Test and rectify starting motors |
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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 starting 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 starting 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 identifying the construction of electric motors testing the cranking motor drive mechanism using appropriate tools, techniques and equipment to dismantle and assemble given starting motors in accordance with manufacturers' recommendations/procedures checking given starting motors for electrical faults testing the solenoids, relays and over-temperature devices for given starting motors, for conformance to specification checking operation and conformance of the engagement mechanism for given starting motors checking the starting system of given starting motors for excessive voltage drops checking conformance of all circuit connections to specifications for given starting motors testing the repaired/overhauled starting motor to ensure that the locked armature current, voltage and torque conform to specifications |
Required knowledge |
Look for evidence that confirms knowledge of: the concepts of magnetism, electromagnetism and induced voltage the principles of operation of electric motors the components and functions of common starting motors the effect of multi-pole/winding/ shunt wiring arrangements on starting motor performance the tests and test procedures that can be used to check the performance of the cranking motor drive mechanism the hazards and control measures associated with testing the performance of cranking motor drive mechanisms, including housekeeping the concept of 'locked armature' in terms of current, voltage and torque the starter locked armature specifications the procedures, tools and equipment for determining locked armature current, voltage and torque the manufacturers' recommended dismantling/assembling procedures, tools and equipment for given starting motors the range of electrical tests that can be applied to starting motors and the purpose of these tests the equipment and procedures required to carry out the tests the function of solenoids, relays and over-temperature devices the procedures for testing solenoids, relays and over-temperature devices for correct operation the operational specifications of the solenoids, relays and over-temperature devices the procedures for testing and adjusting starter engagement mechanisms the specifications of the starter engagement mechanism the effect and causes of voltage drops on starting system operation/performance the procedures for checking starting systems for excessive voltage drops the effect of loose, poorly joined and/or inappropriate insulation on starting motor performance/operation the specifications of all circuit connections 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. | |
Starting motor | Axial and coaxial type starters with drive arrangements such as Dyer, Positork, Sprag clutch, overrunning clutch and inertia drive |
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 |
|---|---|---|---|
| Magnetism, induced voltage and electromagnetism and electric motor principles are understood. | |||
| Starting motor component functions and multi-pole/winding/shunt wiring arrangements are understood. | |||
| Cranking motor drive mechanism is correctly performance tested. | |||
| Starter locked armature current, voltage and torque are correctly determined. | |||
| Starting motors are dismantled and assembled according to manufacturers' recommendations. | |||
| Testing is performed to determine shorts to ground, turn shorts, winding continuity, etc. | |||
| Solenoid, relays and over-temperature devices are correctly tested. | |||
| Starter engagement mechanism is tested and adjusted where possible i.e.: pinion clearance. | |||
| Starting system is free of excessive voltage drops. | |||
| Starting and charging circuit connections are correctly made, tightened and insulated. | |||
| Starter locked armature current, voltage and torque are correctly determined. |
Forms
Assessment Cover Sheet
MEM18031B - Diagnose and rectify low voltage starting systems
Assessment task 1: [title]
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I declare that the assessment tasks submitted for this unit are my own work.
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Result: Competent Not yet competent
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Assessment Record Sheet
MEM18031B - Diagnose and rectify low voltage starting systems
Student name:
Student ID:
Assessment task 1: [title] Result: Competent Not yet competent
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Feedback to student:
Overall assessment result: Competent Not yet competent
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