NZQA Expiring unit standard
904 version 6
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Title
Diagnose faults in an automotive generator type charging system,
and overhaul a DC generator
Level
3
Credits
5
Purpose
This unit standard is for people in the automotive electrical
repair industry. People credited with this unit standard are able
to: demonstrate knowledge of the operation of charging system
that uses a DC (Direct Current) generator; test the charging
system and rectify faults; test and inspect a DC generator;
rectify faults in generator components; assemble and test a
generator; and adjust a regulator and cut-out.
Classification
Motor Industry > Automotive Electrical and Electronics
Available grade
Achieved
Explanatory notes
1
The following legislation and amendments are required to be consulted and followed
where applicable:
– Health and Safety in Employment Act, 1992.
2
Reference to suitable tools and equipment means industry approved tools and
equipment that are recognised within the industry as being the most suited to
complete the task to a professional and competent manner with due regard to safe
working practices.
Outcomes and evidence requirements
Outcome 1
Demonstrate knowledge of the operation of a charging system that uses a DC generator.
Evidence requirements
1.1
The circuit layout of a charging system which uses a generator is described
according to manufacturer’s circuit descriptions, and the function of each part is
defined according to manufacturer’s specifications.
1.2
The construction of a generator and its parts is identified.
1.3
The way in which a generator produces and rectifies a voltage is identified.
NZ Motor Industry Training Organisation
(Incorporated)
SSB Code 101542
 New Zealand Qualifications Authority 2016
NZQA Expiring unit standard
1.4
904 version 6
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Methods of controlling the output of the generator are identified.
Range
current and voltage regulation.
Outcome 2
Test the charging system and rectify faults.
Evidence requirements
2.1
Safe working practices are observed throughout the task.
Range
personal safety, safety of others, equipment and vehicle safety.
2.2
Suitable equipment is selected and used to enable the system to be tested.
2.3
The battery condition is determined and, if necessary, brought up to a fully
charged specification, before continuing with other charging system tests.
2.4
The charging system is tested following a systematic test procedure, and faults
are identified and located.
2.5
Circuit faults are rectified to restore full serviceability of the charging system.
Range
connectors, wires, regulator, warning light.
Outcome 3
Test and inspect a DC generator.
Evidence requirements
3.1
Safe working practices are observed throughout the task.
Range
personal safety, safety of others, equipment and vehicle safety.
3.2
Suitable tools and equipment are selected and used to enable the generator to
be tested and inspected.
3.3
The generator is tested according to manufacturer's instructions to verify that it
is faulty, and the nature of faults is identified and noted.
3.4
The generator is dismantled in the sequence and manner prescribed by the
manufacturer, and any signs indicating the cause of faults are noted.
3.5
Mechanical components are inspected for wear and damage, and the need for
repair and replacement is determined.
Range
case, shaft, brushes and holders, commutator, bushes, pole
shoes, armature core.
NZ Motor Industry Training Organisation
(Incorporated)
SSB Code 101542
 New Zealand Qualifications Authority 2016
NZQA Expiring unit standard
3.6
904 version 6
Page 3 of 4
Electrical parts are tested for open, short, and ground faults, and the need for
repair and replacement is determined.
Range
armature and field windings, commutator, brushes and holders.
Outcome 4
Rectify faults in generator components.
Evidence requirements
4.1
Safe working practices are observed throughout the task.
Range
personal safety, safety of others, equipment and vehicle safety.
4.2
Suitable tools and equipment are selected and used to enable the parts to be
repaired and replaced.
4.3
Repairable components are reconditioned according to manufacturer's
specifications to restore full serviceability.
4.4
Non-repairable, faulty components are replaced with new parts to
manufacturer's specifications.
Outcome 5
Assemble and test a generator.
Evidence requirements
5.1
Safe working practices are observed throughout the task.
Range
personal safety, safety of others, equipment and vehicle safety.
5.2
Suitable tools and equipment are selected and used to enable the generator to
be assembled and tested.
5.3
The generator is assembled in the sequence and manner prescribed by the
manufacturer, and without damage to any of the parts.
5.4
The generator is bench tested and any necessary rectifications made, to ensure
that it complies with the manufacturer's specifications for a fully serviceable unit.
Outcome 6
Adjust a regulator and cut-out.
Evidence requirements
6.1
Safe working practices are observed throughout the task.
Range
personal safety, safety of others, equipment and vehicle safety.
NZ Motor Industry Training Organisation
(Incorporated)
SSB Code 101542
 New Zealand Qualifications Authority 2016
NZQA Expiring unit standard
904 version 6
Page 4 of 4
6.2
Suitable tools and equipment are selected and used to enable the generator to
be adjusted.
6.3
The voltage and current regulators, and the cut-out are adjusted in the
sequence and to the settings prescribed by the manufacturer.
Replacement information
This unit standard has been replaced by unit standard
24107 and unit standard 24108.
This unit standard is expiring. Assessment against the standard must take place by
the last date for assessment set out below.
Status information and last date for assessment for superseded versions
Process
Version Date
Last Date for Assessment
Registration
1
29 October 1993
31 December 2016
Review
2
4 October 1996
31 December 2016
Review
3
26 February 1999
31 December 2016
Review
4
25 January 2008
31 December 2016
Rollover
5
19 November 2010
31 December 2016
Rollover
6
18 February 2016
31 December 2020
Consent and Moderation Requirements (CMR) reference
0014
This CMR can be accessed at http://www.nzqa.govt.nz/framework/search/index.do.
Please note
Providers must be granted consent to assess against standards (accredited) by NZQA, or
an inter-institutional body with delegated authority for quality assurance, before they can
report credits from assessment against unit standards or deliver courses of study leading
to that assessment.
Industry Training Organisations must be granted consent to assess against standards by
NZQA before they can register credits from assessment against unit standards.
Providers and Industry Training Organisations, which have been granted consent and
which are assessing against unit standards must engage with the moderation system that
applies to those standards.
Consent requirements and an outline of the moderation system that applies to this
standard are outlined in the Conesnt and Moderation Requirements (CMR). The CMR
also includes useful information about special requirements for organisations wishing to
develop education and training programmes, such as minimum qualifications for tutors and
assessors, and special resource requirements.
NZ Motor Industry Training Organisation
(Incorporated)
SSB Code 101542
 New Zealand Qualifications Authority 2016