NZQA Expiring unit standard
25676 version 3
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Title
Explain automated process control and fault diagnosis in an
automated dairy manufacturing process
Level
4
Credits
8
Purpose
People credited with this unit standard are able to, for an
automated dairy manufacturing process: identify components
and their functions, and the hierarchy and flow of information;
identify and explain common faults of devices used; describe
the actions to be taken in a fault-finding process; and explain
the purpose and components of a functional description.
Classification
Dairy Manufacturing > Dairy Product Safety and Risk
Management
Available grade
Achieved
Explanatory notes
Definitions
Organisational requirements – refer to instructions to staff on policy and procedures
which are documented in memo or manual format and are available in the workplace.
These requirements include but are not limited to – site specific requirements, and
company quality management requirements.
SCADA – refers to supervisory control and data acquisition, and is the name given to
systems that ‘sit over the top’ of a PLC to provide the operator and other users
access to the system. SCADA systems work in real-time and provide graphical
status displays.
PLC – refers to programmable logic controller. The PLC forms the basis of most
control systems in the dairy industry.
HMI – refers to human/machine interface.
This unit standard is
expiring
Outcomes and evidence requirements
Outcome 1
Identify components and their functions, and the hierarchy and flow of information for an
automated dairy manufacturing process control network.
Evidence requirements
1.1
The components of an automated dairy manufacturing process control network
and their functions are identified.
Primary Industry Training Organisation
SSB Code 101558
 New Zealand Qualifications Authority 2016
NZQA Expiring unit standard
Range
1.2
25676 version 3
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components include but are not limited to – HMI, PLC, local and
remote input and output modules, SCADA, fieldbus systems,
smart devices, local area networks.
Hierarchy and horizontal information flows in the control network are identified.
Outcome 2
Identify and explain the common faults of devices used in an automated dairy
manufacturing process control system.
Range
digital input devices include but are not limited to – limit switches, reed
switches, proximity sensors, level switches, photoelectric sensors;
digital output devices include but are not limited to – solenoid valves, motor
relays, alarms;
analogue input devices include but are not limited to – temperature
measurement, flow measurement, pressure measurement, level measurement,
conductivity measurement, pH meter;
analogue output devices include but are not limited to – control valves, variable
speed drives, screen displays.
Evidence requirements
2.1
Common faults associated with devices used in an automated dairy
manufacturing process control system are identified and explained.
Outcome 3
Describe the actions to be taken in a fault-finding process for an automated dairy
manufacturing process.
This unit standard is
expiring
Range
steps in a fault-finding process include but are not limited to –
Evidence requirements
3.1
The actions to be taken in each step of a fault-finding process are described in
accordance with organisational requirements.
checking of fault and status information, making the plant safe,
physical checks, documentation and functional description checks,
liaison with other operators and service technicians, fault repair or
reset, documentation of fault diagnosis and rectification.
Outcome 4
Explain the purpose and components of a functional description.
4.1
The purpose of a functional description is described in accordance with
organisational requirements.
4.2
The components of a functional description are identified.
Primary Industry Training Organisation
SSB Code 101558
 New Zealand Qualifications Authority 2016
NZQA Expiring unit standard
Range
25676 version 3
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components of a functional description include but are not limited
to – selection, safety checks, fault and status checks, route
checks, start sequence, step numbers, flags, stop sequence.
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
21 August 2009
31 December 2016
Review
2
17 September 2015
31 December 2016
Rollover
3
21 January 2016
31 December 2019
Consent and Moderation Requirements (CMR) reference
0022
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,
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.
This unit standard is
expiring
Requirements for consent to assess and an outline of the moderation system that applies
to this standard are outlined in the Consent 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.
Primary Industry Training Organisation
SSB Code 101558
 New Zealand Qualifications Authority 2016