MEM18100 — Fault-find, test and rectify AC machines and circuits

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What an assessment for MEM18100 must cover

131 assessable components: 3 elements (12 performance criteria), 19 performance evidence and 100 knowledge evidence requirements. An audit-defensible tool maps every question and task back to these — that mapping is the coverage matrix Auditori generates alongside the assessment.

Elements & performance criteria

1 Determine job requirements

1.1Follow standard operating procedures (SOPs)
1.2Comply with work health and safety (WHS) requirements at all times, including appropriate risk control measures
1.3Use appropriate personal protective equipment (PPE) in accordance with SOPs
1.4Research the nature of the fault through checking of documentation and/or consultation with appropriate person

2 Prepare to fault find on AC machines and associated control circuits

2.1Obtain all necessary tools, equipment and testing instruments needed to conduct fault diagnosis of AC machines and circuits
2.2Isolate and tag circuits and equipment in accordance with procedures

3 Fault find AC machines and associated control circuits

3.1Apply diagnostic techniques to solve problems in AC machines and their associated control circuits, including the use of specialised test equipment
3.2Test single and three-phase windings for continuity and insulation resistance between windings and to earth with appropriate test equipment
3.3Dismantle and reassemble AC machine using appropriate fitting techniques, equipment and tools in accordance with specifications and procedures, if required
3.4Remove/repair/replace faulty components/circuits in accordance with manufacturer specifications and regulatory requirements
3.5Test AC machine/circuit to ensure functionality in accordance with specifications
3.6Document all necessary repairs in accordance with SOPs

Performance evidence

following work instructions, standard operating procedures (SOPs) and safe work practices
identifying and interpreting circuits, drawings and specifications relevant to the work to be undertaken
determining the electrical and non-electrical isolation requirements to prevent the creation of hazards linked from the loss of machine/system/process control according to established procedures
using lock out tag procedures with appropriate tags/signs
proving electrical isolation and following established safety rules prior to working on electrical equipment or wiring
ensuring all electrical equipment and tools are tested and tagged and up to date
using specialised test equipment, including condition monitoring equipment to conduct on-line analysis
carrying out on-line functional tests for voltage and current using a voltmeter or multimeter and a clip on ammeter
applying fault finding and diagnostic techniques on at least three (3) or more of the following AC machines and circuits:
single-phase motors
three-phase motors
variable speed drives (VSDs)
synchronous machines
non-rotating AC equipment and components
carrying out electrical tests for continuity and insulation resistance tests; between windings and to earth of single and three-phase motors
dismantling, replacing and assembling single and three-phase AC machines using appropriate hand and power tools in accordance with manufacturer specifications, if required
complying with the Australian/New Zealand Wiring Rules and local supply requirements for three-phase motor installations and starters
using a synchroscope for paralleling of alternators
documenting all necessary repairs in accordance with SOPs

Knowledge evidence

safe work practices and procedures and use of personal protective equipment (PPE)
three-phase induction motors, including:
basic component parts of a three-phase induction motor, i.e. stator and rotor (squirrel-cage and wound rotor)
motor enclosures
terminal block arrangements – connecting a three-phase motor in both star and delta
operating principles, including:
rotating magnetic fields
rate of rotation and factors affecting it
direction of rotation and reversal
induction and its effects, including:
torque
slip
rotor frequency
operating characteristics, including:
squirrel-cage rotors
special purpose squirrel-cage rotors
wound-rotor motors
operating parameters for induction motors
single-phase induction motors, characteristics and operating principles of the following:
split-phase motor
capacitor-start motor
capacitor-start, capacitor-run motor
permanently-split capacitor motor
shaded-pole motor
series motor – operating characteristics and reversing the direction of rotation
comparison of single-phase and three-phase motors and advantages and disadvantages of three-phase motors
abnormal operating conditions for three-phase motors, including:
phase reversal, single phasing and overloading
voltage fluctuation, higher operating temperatures, frequency variation, overloading and frequent starting
other factors, including exposure to corrosive fumes, explosive vapours, dust, steam, salt air, high humidity, operation in ambient temperature of below approximately 100C or above 400C, or operation at altitudes in excess of 1000 metres
abnormal operating conditions for single-phase motors, including centrifugal switch failure
diagnostic techniques including the use of specialised test equipment, including growlers
electrical tests for continuity and insulation resistance tests; between windings and to earth of single and three-phase motors
testing, including the following:
DC test – to determine the stator resistance
no-load test – to determine the rotational losses and magnetisation current
locked rotor test – to determine the rotor and stator impedances
thermography and condition monitoring
dismantling three-phase motors, including application of ‘witness marks’
operation of a ’growler’ to perform voltage drop testing of armatures of the series or universal motor
electric motor control and protection, including:
reasons why motor protection is required
Australian/New Zealand Wiring Rules and local supply requirements for three-phase motor installations and starters, including:
isolation and switching
automatic starting
emergency stopping
starting methods for limitation of starting currents
three-phase motor starters and their operating principles and characteristics, including:
DOL
star-delta
autotransformer
primary resistance
secondary resistance
various types of motor overload protection, including high rupture capacity (HRC) fuses
operating principles of magnetically activated over-current relays, thermally activated over-current relays and combined thermal-magnetic over-current relays
temperature-dependent resistor protection
under-voltage and over-voltage protection
single-phasing and reverse-phase sequence protection and the protection methods
types of enclosures to give environmental protection, including:
open - ends of machine are open allowing free ventilation with fan attached to the motor shaft to draw air through the motor
protected - protection obtained by fastening steel wire mesh or perforated metal over enclosures with fan attached to the motor shaft to draw air through the motor
drip proof - an advance on the protected motors with openings further protected by a hood to prevent foreign materials or moisture from falling vertically into motor
duct ventilated - air is drawn from outside through a duct or air is forced via a blower through a duct to the motor
totally enclosed - no contact between the air outside and inside the machine can be classified as waterproof, weatherproof or submersible
flameproof - totally enclosed motor with additional precautions, including to seal bearings and used where there are flammable gases and risk of explosion if spark enters the atmosphere
AS 1359.106-1996 Rotating electrical machines – General requirements – Methods for cooling (IC Code)
three-phase motor braking and the principles of operation of the major types, including mechanical, eddy current, dynamic, regenerative and plug
altering the speed of AC induction motors by varying the number of poles or frequency
VSDs, including:
methods and operating principles
installation requirements
shielding and filtering
harmonics and power factor
performance characteristics
set up and commissioning
common faults – their symptoms and causes
three-phase synchronous machines – alternators:
construction and operating principles
excitation and generated voltage
effect of load on alternator voltage
effect of power factor on output voltage of an alternator
voltage regulation
alternator ratings expressed in kVA
parallel operation of alternators – synchronising and the methods used to achieve synchronisation, including the use of a synchroscope
effects of a change in excitation when connecting two alternators in parallel
three-phase synchronous machines – motors:
construction and operating principles
effect of a load on a synchronous motor
effect on varying the field (DC) excitation, including changes in power factor
hunting in three-phase synchronous machines and the methods used to reduce this effect, including the use of amortisseur windings in the pole faces of the rotor
starting methods and applications of three-phase synchronous motors
single-phase synchronous motors:
the primary purpose and the major types: reluctance and hysteresis motors
applications of single-phase synchronous motors
standby power supplies including uninterruptable power supplies (UPS) and the purpose they provide, i.e. mains power at a specified voltage and frequency
standby engine driven alternators starting methods and sequence of operation
non-rotating AC equipment and components including construction, operation and application of:
linear motors and actuators
solenoids, relays and contactors
welders and other non-rotating AC machines

Unit content sourced from training.gov.au — © Commonwealth of Australia, licensed under CC BY 4.0. Auditori is not affiliated with the Department of Employment and Workplace Relations.

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Questions about assessing MEM18100

What does an assessment tool for MEM18100 need to cover?

To satisfy the Principles of Assessment and Rules of Evidence, an assessment for MEM18100 needs to address all 131 unit components: 3 elements with 12 performance criteria, 19 performance evidence requirements, 100 knowledge evidence requirements, and the foundation skills. A coverage matrix mapping each question and task to these components is what an auditor looks for.

How does Auditori generate an assessment tool for MEM18100?

Auditori pulls the current release of MEM18100 from training.gov.au and generates a complete package: candidate assessment, assessor guide with model answers and observation criteria, and a coverage matrix mapping every component. A suitably qualified person then reviews and approves the draft in a built-in workflow — consistent with ASQA's guidance on AI use in VET — before export as branded PDF and editable Word.

Is the first assessment tool really free?

Yes. Every new account includes one free credit — enough to generate the complete assessment tool for MEM18100 — with no card and no subscription required. After that it's pay-as-you-go per unit.

Can I check my existing MEM18100 assessment instead of generating a new one?

Yes — upload your existing assessment or learner guide and Auditori maps it against every element, performance criterion, PE and KE of MEM18100, showing exactly what's covered and what's missing. Mapping costs a quarter of a credit.

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