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Evidence Guide: UEEEL0042 - Develop engineering solutions for d.c. machine and control problems

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

 

UEEEL0042 - Develop engineering solutions for d.c. machine and control problems

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

Prepare to develop engineering solution for d.c. machine problems

  1. WHS/OHS processes and workplace procedures for a given work area are identified, obtained and applied
WHS/OHS processes and workplace procedures for a given work area are identified, obtained and applied

Completed
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WHS/OHS risk control measures and workplace procedures in preparation for the work are followed

Completed
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Scope of d.c. machine problem is determined from performance specifications and/or documentation and in consultation with relevant person/s

Completed
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Activities are planned to meet scheduled timelines in consultation with others involved in the work

Completed
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Strategies are formed to ensure solution development and implementation is carried out efficiently

Completed
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Develop engineering solution for d.c. machine problems

  1. WHS/OHS risk control measures and workplace procedures for carrying out the work are followed
WHS/OHS risk control measures and workplace procedures for carrying out the work are followed

Completed
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Relevant d.c. machine construction operation characteristics and applications are applied to developing solutions to d.c. machine problems

Completed
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Parameters, specifications and performance requirements to each machine problem are obtained in accordance with workplace procedures

Completed
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Approaches to resolving d.c. machine problems are analysed to provide most effective solutions

Completed
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Unplanned events are dealt with safely in accordance with relevant industry standards and workplace procedures

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Quality of work is monitored in accordance with relevant industry standards and workplace procedures

Completed
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Implement engineering solution and complete documentation

  1. Solutions to machine problems are tested to determine their effectiveness and modified as required
Solutions to machine problems are tested to determine their effectiveness and modified as required

Completed
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Adopted solutions are documented and instructions for implementation with risk control measure developed

Completed
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Relevant person/s required to implement solutions to d.c. machine problems is coordinated in accordance with relevant industry standards and workplace procedures

Completed
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Justification for solutions used to solve d.c. machine problems is documented in work/project records in accordance with relevant industry standards

Completed
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Assessed

Teacher: ___________________________________ Date: _________

Signature: ________________________________________________

Comments:

 

 

 

 

 

 

 

 

Instructions to Assessors

Required Skills and Knowledge

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 one occasion and include:

understanding the extent of the machine problem

forming effective strategies for solution development and implementation

obtaining machine parameters, specifications and performance requirements appropriate to each problem

testing and solutions to machine problems

documenting instruction for implementation of solutions that incorporate risk control measure to be followed

documenting justification of solutions implemented in accordance with professional standards

dealing with unplanned events

applying relevant work health and safety (WHS)/occupational health and safety (OHS) requirements, including using risk control measures

determining the scope of direct current (d.c.) machine problems

planning activities to meet timelines

analysing approaches to solutions

monitoring quality of work.

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:

d.c. machine diagnostics and engineering solutions for d.c. machine problems, including:

basic d.c. machine construction and operation encompassing:

general principles of operation

applications of d.c. machines

construction of d.c. machines

d.c. machine configurations; series, shunt, compound long shunt and compound short shunt

armature and field currents

insulation

ratings

cooling paths

bearings

general maintenance of d.c. machines

construction and use of lap and wave windings encompassing:

coils and elements

generated voltage equation for generator

generated voltage equation for motors

application of lap and wave windings

commutation process encompassing:

use of interpoles

loading of machines

brush shifting

brush selection

classes of brush grades:

natural graphite, hard carbon, electrographite, metal-graphite and metal-carbon, "treated" grades

carbon brush contact characteristics:

specific resistance, thermal conductivity, density and porosity, elastic properties and contact properties

carbon brush factors:

pressure, current, polarity and speed

brush construction:

dimensions, tolerances, preferred sizes, surfaces, edges, bevels, flexible shunts, connection of flexible shunt to brush and insulation of flexible connections

brush holders:

types, brush angles, trailing holders, reaction holders, top bevel angles, reversible rotation, cantilever holders, effective arc of contact, construction of brush holders and pressure mechanism

mounting of brush holders and brushes:

clearances, brush angle, brush arm spacing, alignment, staggering, brush bedding and brush pressure

brush operation:

temperature rise, number and size of brushes, current distribution between brushes, slotting brushes, polarity effects, arc of contact, materials for commutators and mica

selection of brush grades:

machine data, current density, commutator peripheral speed, brush arc, pitch of segments, number of segments covered by brush and cooling surface

armature reaction in d.c. machines encompassing:

effect of armature reaction on d.c. machine characteristics

use of compensating winding

d.c. generators encompassing:

relative advantages and disadvantages of the various d.c. generator configurations and their performance under various load conditions

voltage regulation as a percentage or per unit value

operation in parallel

d.c. motors encompassing:

relative advantages and disadvantages of the various d.c. motor configurations and their performance under various load conditions

shape of motor speed/torque curves

reversal of rotation

starting and protection of d.c. motors encompassing:

types of d.c. motor starters in use

d.c. motor protection

speed regulation and speed control of d.c. motors encompassing:

methods in use

effect on motor design and operation caused by the use of SCR

speed control equipment

braking of d.c. motors encompassing:

plugging

dynamic

regenerative

mechanical

losses, heating and efficiency encompassing:

copper losses

iron losses

mechanical losses

efficiency

acceleration of d.c. motors and loads encompassing:

characteristics of typical loads

matching a suitable motor to a given load

heating of windings

derating of motors

special d.c. motors construction, operation and applications encompassing:

permanent-magnet motors

brushless motors (e.c. motors)

coreless and moving coil motors

linear motors

printed circuit motor

stepping motors

voice-coil motors

maintenance of d.c. machines encompassing:

routine maintenance

breakdown repairs

types of faults encompassing:

brushes/brush gear problems:

sparking, excessive heating, excessive wear of brushes, commutator or slip rings, bad surface conditions, excessive maintenance, flexible burning, flexible corrosion, separation or grooving, blackening, copper picking, copper dragging and brush noise

adjustment of machines encompassing:

correct brush position

machining and finishing of commutators

problem-solving techniques

machine parameters, specifications and performance requirements

relevant manufacturer specifications and operating instructions

relevant job safety assessments or risk mitigation processes

relevant WHS/OHS legislated requirements

relevant workplace documentation

relevant workplace quality, instructions, policies and 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.

Developing engineering solutions must include the following:

at least two different d.c. machines using different control systems