SIST EN 61800-9-1:2017
(Main)Adjustable speed electrical power drive systems - Part 9-1: Energy efficiency of power drive systems, motor starters, power electronics and their driven applications - General requirements for setting energy efficiency standards for power driven equipment using the Extended Product Approach (EPA) and semi analytic model (SAM) (IEC 61800-9-1:2017)
Adjustable speed electrical power drive systems - Part 9-1: Energy efficiency of power drive systems, motor starters, power electronics and their driven applications - General requirements for setting energy efficiency standards for power driven equipment using the Extended Product Approach (EPA) and semi analytic model (SAM) (IEC 61800-9-1:2017)
IEC 61800-9-1:2017 specifies the general methodology to energy efficiency standardization for any extended product by using the guidance of the extended product approach (EPA).
This document specifies the methodology of determination of losses of the extended product and its sub-parts. It is applicable to motor systems operated by a motor starter or by a converter (power drive systems).
Drehzahlveränderbare elektrische Antriebe - Teil 9-1: Energieeffizienz für Antriebssysteme, Motorstarter, Leistungselektronik und deren angetriebene Einrichtungen - Allgemeine Anforderungen für die Erstellung von Normen zur Energieeffizienz von Ausrüstungen mit Elektroantrieb nach dem erweiterten Produktansatz (EPA) und semi-analytischen Modellen (SAM) (IEC 61800-9-1:2017)
Entraînements électriques de puissance à vitesse variable - Partie 9-1: Écoconception des entraînements électriques de puissance, des démarreurs de moteurs, de l'électronique de puissance et de leurs applications entraînées - Exigences générales pour définir les normes d'efficacité énergétique d'un équipement entraîné via l'approche produit étendu (EPA) et le modèle semi-analytique (SAM) (IEC 61800-9-1:2017)
L'IEC 61800-9-1:2017 spécifie la méthodologie générale relative à la normalisation de l'efficacité énergétique pour tout produit étendu en utilisant les lignes directrices de l'approche produit étendu (EPA).
Le présent document spécifie la méthodologie de détermination des pertes du produit étendu et de ses sous-parties. Il est applicable aux systèmes moteurs entraînés par un démarreur de moteur ou par un convertisseur (entraînements électriques de puissance).
Električni pogonski sistemi z nastavljivo hitrostjo - 9-1. del: Okoljsko primerno načrtovanje pogonskih sistemov, motornih zaganjalnikov, močnostne elektronike in naprav, ki jih poganjajo - Splošne zahteve za določanje standardov za energijsko učinkovitost za pogonsko opremo, z uporabo razširjene zasnove izdelka (EPA) in polanalitičnega modela (SAM) (IEC 61800-9-1:2017)
Standard IEC 61800-9-1:2017 določa splošno metodologijo za standardizacijo energijske učinkovitosti za razširjene proizvode z uporabo smernic glede razširjene zasnove izdelka (EPA).
Ta dokument določa metodologijo za določanje izgub razširjene zasnove proizvodov in njenih poddelov. Uporablja se za motorne sisteme, ki jih upravlja motorni zaganjalnik ali pretvornik (pogonski sistemi).
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN 61800-9-1:2017
01-december-2017
1DGRPHãþD
SIST EN 50598-1:2015
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Adjustable speed electrical power drive systems - Part 9-1: Energy efficiency of power
drive systems, motor starters, power electronics and their driven applications - General
requirements for setting energy efficiency standards for power driven equipment using
the Extended Product Approach (EPA) and semi analytic model (SAM) (IEC 61800-9-
1:2017)
Ta slovenski standard je istoveten z: EN 61800-9-1:2017
ICS:
27.015 (QHUJLMVNDXþLQNRYLWRVW Energy efficiency. Energy
2KUDQMDQMHHQHUJLMHQD conservation in general
VSORãQR
29.200 8VPHUQLNL3UHWYRUQLNL Rectifiers. Convertors.
6WDELOL]LUDQRHOHNWULþQR Stabilized power supply
QDSDMDQMH
SIST EN 61800-9-1:2017 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN 61800-9-1:2017
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SIST EN 61800-9-1:2017
EUROPEAN STANDARD EN 61800-9-1
NORME EUROPÉENNE
EUROPÄISCHE NORM
June 2017
ICS 29.130.01; 29.160.30; 29.200 Supersedes EN 50598-1:2014
English Version
Adjustable speed electrical power drive systems -
Part 9-1: Ecodesign for power drive systems, motor starters,
power electronics and their driven applications - General
requirements for setting energy efficiency standards for power
driven equipment using the extended product approach (EPA)
and semi analytic model (SAM)
(IEC 61800-9-1:2017)
Entraînements électriques de puissance à vitesse variable - Drehzahlveränderbare elektrische Antriebe -
Partie 9-1: Écoconception des entraînements électriques de Teil 9-1: Energieeffizienz für Antriebssysteme, Motorstarter,
puissance, des démarreurs de moteurs, de l'électronique de Leistungselektronik und deren angetriebene Einrichtungen -
puissance et de leurs applications entraînées - Exigences Allgemeine Anforderungen für die Erstellung von Normen
générales pour définir les normes d'efficacité énergétique zur Energieeffizienz von Ausrüstungen mit Elektroantrieb
d'un équipement entraîné via l'approche produit étendu nach dem erweiterten Produktansatz (EPA) und semi-
(EPA) et le modèle semi-analytique (SAM) analytischen Modellen (SAM)
(IEC 61800-9-1:2017) (IEC 61800-9-1:2017)
This European Standard was approved by CENELEC on 2017-04-07. CENELEC members are bound to comply with the CEN/CENELEC
Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC
Management Centre or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden,
Switzerland, Turkey and the United Kingdom.
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2017 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN 61800-9-1:2017 E
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SIST EN 61800-9-1:2017
EN 61800-9-1:2017
European foreword
The text of document 22G/348/FDIS, future edition 1 of IEC 61800-9-1, prepared by SC 22G
"Adjustable speed electric drive systems incorporating semiconductor power converters", of IEC/TC 22
"Power electronic systems and equipment" was submitted to the IEC-CENELEC parallel vote and
approved by CENELEC as EN 61800-9-1:2017.
The following dates are fixed:
• latest date by which the document has to be implemented at (dop) 2018-01-07
national level by publication of an identical national
standard or by endorsement
• latest date by which the national standards conflicting with (dow) 2020-04-07
the document have to be withdrawn
This document supersedes EN 50598-1:2014.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.
Endorsement notice
The text of the International Standard IEC 61800-9-1:2017 was approved by CENELEC as a
European Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standards indicated:
IEC 60034-1 NOTE Harmonized as EN 60034-1.
IEC 60034-2-2 NOTE Harmonized as EN 60034-2-2.
IEC 60034-30-1 NOTE Harmonized as EN 60034-30-1.
IEC 60947-4-1 NOTE Harmonized as EN 60947-4-1.
IEC 60947-4-2 NOTE Harmonized as EN 60947-4-2.
2
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SIST EN 61800-9-1:2017
EN 61800-9-1:2017
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
NOTE 1 When an International Publication has been modified by common modifications, indicated by (mod),
the relevant EN/HD applies.
NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is
available here: www.cenelec.eu.
Publication Year Title EN/HD Year
IEC 60050-161 - International Electrotechnical - -
Vocabulary (IEV) - Chapter 161:
Electromagnetic compatibility
IEC 60034-2-1 2014 Rotating electrical machines - Part 2-1: EN 60034-2-1 2014
Standard methods for determining
losses and efficiency from tests
(excluding machines for traction
vehicles)
IEC/TS 60034-2-3 - Rotating electrical machines - Part 2-3: - -
Specific test methods for determining
losses and efficiency of converter-fed
AC induction motors
IEC 61800-9-2 2017 Adjustable speed electrical power drive EN 61800-9-2 2017
systems - Part 9-2: Ecodesign for power
drive systems, motor starters, power
electronics and their driven
applications - Energy efficiency
indicators for power drive systems and
motor starters
3
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SIST EN 61800-9-1:2017
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SIST EN 61800-9-1:2017
IEC 61800-9-1
®
Edition 1.0 2017-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Adjustable speed electrical power drive systems –
Part 9-1: Ecodesign for power drive systems, motor starters, power electronics
and their driven applications – General requirements for setting energy
efficiency standards for power driven equipment using the extended product
approach (EPA) and semi analytic model (SAM)
Entraînements électriques de puissance à vitesse variable –
Partie 9-1: Écoconception des entraînements électriques de puissance, des
démarreurs de moteurs, de l'électronique de puissance et de leurs applications
entraînées – Exigences générales pour définir les normes d'efficacité
énergétique d'un équipement entraîné via l'approche produit étendu (EPA) et
le modèle semi-analytique (SAM)
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.130.01; 29.160.30; 29.200 ISBN 978-2-8322-3995-7
Warning! Make sure that you obtained this publication from an authorized distributor.
Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.
® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
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SIST EN 61800-9-1:2017
– 2 – IEC 61800-9-1:2017 IEC 2017
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 8
2 Normative references . 8
3 Terms, definitions and symbols. 9
3.1 Terms and definitions . 9
3.2 Symbols . 10
4 Requirements for the development of energy efficiency standards for extended
products . 12
4.1 General . 12
4.2 Responsibility of the extended product standard or technical committee . 13
4.3 Elements to achieve the extended product approach . 14
5 Requirements for the semi analytic model (SAM) of the extended product . 15
6 Requirements for the semi analytic model (SAM) of the motor system . 16
6.1 General . 16
6.2 Operating points of the PDS . 16
6.3 Requirements if the motor system contains no CDM . 17
7 Merging the semi analytic models (SAMs) to the extended product approach . 17
7.1 General . 17
7.2 Speed versus torque loss points of a motor system . 18
7.3 How to determine intermediate speed versus torque loss points of a motor
system . 19
7.3.1 General . 19
7.3.2 Loss determination by maximum losses of neighboured loss points . 20
7.3.3 Loss determination by two-dimensional interpolation of losses of
neighboured loss points . 20
Annex A (informative) Example how to apply the SAM in the EPA for pump systems
with a required speed versus torque loss points using the PDS . 22
Annex B (informative) Calculation of the energy consumption based on the duty profile . 24
Annex C (informative) Basic torque and power vs. speed profiles, operating points
over time . 25
C.1 General . 25
C.2 Basic torque and power vs. speed profiles . 25
C.3 Operating points over time . 26
C.4 Definition of the operating points over time . 26
C.4.1 General . 26
C.4.2 Calculation of the energy consumption based on the operating points
over time . 27
C.4.3 Example of loss calculation for different operating points over time . 28
Bibliography . 31
Figure 1 – Illustration of core requirements of energy efficiency standardization . 6
Figure 2 – Illustration of the extended product with embedded motor system . 9
Figure 3 – Stakeholders and responsibilities for determination of the energy efficiency
indicator for an extended product . 13
Figure 4 – Illustration of the operating points (shaft speed, torque) for the
determination of relative losses of the power drive system (PDS) . 17
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SIST EN 61800-9-1:2017
IEC 61800-9-1:2017 IEC 2017 – 3 –
Figure 5 – Speed versus torque relative power loss operating points to determine the
motor starter or switchgear losses . 17
Figure 6 – Responsibilities and workflow to derive the energy efficiency index (EEI) of
an extended product . 18
Figure 7 – Four segments of deviating operating points of a PDS . 19
Figure 8 – Two-dimensional interpolation for deviating operating points . 20
Figure A.1 – Three points of relative losses and shaded area of interest for the pump
manufactures while defining their EEI (energy efficiency index) . 22
Figure A.2 – Example how the SAMs of the PDS and the pump system shall interact to
the resulting efficiency index of a pump system . 23
Figure C.1 – Typical basic torque and power vs. speed profiles . 26
Figure C.2 – Example of operating points over time . 27
Table 1 – Illustration how to combine essential elements of the efficiency contributions . 15
Table C.1 – Operating points over time for the investigated examples . 28
Table C.2 – Losses in the specified operating points for configuration 1 . 28
Table C.3 – Losses in the specified operating points for configuration 2 . 29
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SIST EN 61800-9-1:2017
– 4 – IEC 61800-9-1:2017 IEC 2017
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ADJUSTABLE SPEED ELECTRICAL POWER DRIVE SYSTEMS –
Part 9-1: Ecodesign for power drive systems, motor starters,
power electronics and their driven applications –
General requirements for setting energy efficiency
standards for power driven equipment using the extended
product approach (EPA) and semi analytic model (SAM)
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 61800-9-1 has been prepared by subcommittee 22G: Adjustable
speed electric drive systems incorporating semiconductor power converters, of IEC technical
committee 22: Power electronic systems and equipment.
The text of this standard is based on the following documents:
FDIS Report on voting
22G/348/FDIS 22G/351/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
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SIST EN 61800-9-1:2017
IEC 61800-9-1:2017 IEC 2017 – 5 –
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all parts in the IEC 61800 series, published under the general title Adjustable speed
electrical power drive systems, can be found on the IEC website.
The committee has decided that the contents of this publication will remain unchanged until
the stability date indicated on the IEC website under "http://webstore.iec.ch" in the data
related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates
that it contains colours which are considered to be useful for the correct
understanding of its contents. Users should therefore print this document using a
colour printer.
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SIST EN 61800-9-1:2017
– 6 – IEC 61800-9-1:2017 IEC 2017
INTRODUCTION
IEC SC 22G includes the standardization task force for dealing with energy efficiency of motor
systems. It has close collaboration with several other technical committees (for example,
IEC TC 2, IEC SC 121A).
IEC SC 22G maintains responsibility for all relevant aspects in the field of energy efficiency
and ecodesign requirements for power electronics, switchgear, control gear and power drive
systems and their industrial applications.
The core requirements of energy efficiency standardization are illustrated in Figure 1. The
work has been agreed to provide the reasonable target as a best compromise.
Market surveillable
(independent
certifiable)
Technically
comprehensive
Reasonable target
Manufacturer neutral
(no marketing messages)
IEC
Figure 1 – Illustration of core requirements
of energy efficiency standardization
IEC 61800 (all parts) does not deal with mechanical engineering components.
NOTE Geared motors (motors with directly adapted gearboxes) are treated like power drive systems (converter
plus motor). See IEC 60034-30-1 for classification of the losses of a geared motor. The efficiency classes of
gearboxes as individual components are under consideration.
IEC 61800-9-1 is a subpart of the IEC 61800 series, which has the following structure:
– Part 1: General requirements – Rating specifications for low voltage adjustable speed d.c.
power drive systems
– Part 2: General requirements – Rating specifications for low voltage adjustable speed a.c.
power drive systems
– Part 3: EMC requirements and specific test methods
– Part 4: General requirements – Rating specifications for a.c. power drive systems above
1 000 V a.c. and not exceeding 35 kV
– Part 5: Safety requirements
– Part 6: Guide for determination of types of load duty and corresponding current ratings
– Part 7: Generic interface and use of profiles for power drive systems
– Part 8: Specification of voltage on the power interface
– Part 9: Ecodesign for power drive systems, motor starters, power electronics and their
driven applications
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SIST EN 61800-9-1:2017
IEC 61800-9-1:2017 IEC 2017 – 7 –
Each part is further subdivided into several subparts, published either as International
Standards or as Technical Specifications or Technical Reports, some of which have already
been published. Other will be published with the part number followed by a dash and a
second number identifying the subdivision (for example, IEC 61800-9-2).
This subpart of IEC 61800-9 is an International Standard for characterizing the energy
efficiency of motor systems when supplied by a motor starter or by a variable
voltage/frequency converter. The goal of this part of IEC 61800-9 is to establish a clear and
simple system for the comparison of the energy performance of motor systems that can help
manufacturers to improve their products, to give users the necessary transparency and
information and to provide a robust reference base for regulators and minimum energy
performance standards.
The IEC 61800-9 series (Ecodesign for power drive systems, motor starters, power
electronics and their driven applications) will consist of the following subparts:
– Part 9-1: General requirements for setting energy efficiency standards for power driven
equipment using the extended product approach (EPA) and semi analytic model (SAM)
– Part 9-2: Energy efficiency indicators for power drive systems and motor starters
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– 8 – IEC 61800-9-1:2017 IEC 2017
ADJUSTABLE SPEED ELECTRICAL POWER DRIVE SYSTEMS –
Part 9-1: Ecodesign of power drive systems, motor starters,
power electronics and their driven applications –
General requirements for setting energy efficiency
standards for power driven equipment using the extended
product approach (EPA) and semi analytic model (SAM)
1 Scope
This part of IEC 61800 specifies the general methodology to energy efficiency standardization
for any extended product by using the guidance of the extended product approach (EPA).
It enables product committees for driven equipment connected to motor systems (so called
extended products) to interface with the relative power losses of the connected motor system
(e.g. power drive system) in order to calculate the system energy efficiency for the whole
application.
This is based on specified calculation models for speed/load profiles, the duty profiles and
relative power losses of appropriate torque versus speed operating points.
This document specifies the methodology of determination of losses of the extended product
and its sub-parts.
This document is applicable to motor systems operated by a motor starter or by a converter
(power drive systems).
This document does not specify requirements for environmental impact declarations.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their
content constitutes requirements of this document. For dated references, only the edition
cited applies. For undated references, the latest edition of the referenced document (including
any amendments) applies.
IEC 60050-161, International Electrotechnical Vocabulary – Part 161: Electromagnetic
compatibility
IEC 60034-2-1:2014, Rotating electrical machines – Part 2-1: Standard methods for
determining losses and efficiency from tests (excluding machines for traction vehicles)
IEC TS 60034-2-3, Rotating electrical machines – Part 2-3: Specific test methods for
determining losses and efficiency of converter-fed AC induction motors
IEC 61800-9-2:2016, Adjustable speed electrical power drive systems – Part 9-2: Ecodesign
for power drive systems, motor starters, power electronics and their driven applications –
Energy efficiency indicators for power drive systems and motor starters
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SIST EN 61800-9-1:2017
IEC 61800-9-1:2017 IEC 2017 – 9 –
3 Terms, definitions and symbols
3.1 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 60050-161 and the
following apply.
ISO and IEC maintain terminological databases for use in standardization at the following
addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1.1
duty profile
load-time profile
3.1.2
energy efficiency index
EEI
value describing the energy efficiency of an application, resulting from the extended product
approach (EPA)
3.1.3
extended product
EP
driven equipment together with its connected motor system (e.g a PDS)
Note 1 to entry: See Figure 2.
Extended product
Motor system
Power drive system (PDS)
Driven equipment
Complete drive module (CDM)
Mains Basic
Trans- Load
Feeding
and drive
Motor
mission machine
section
mains module
cabling (BDM)
Motor starter
(contactor,
softstarter, etc.)
Motor control system = CDM or starter
IEC
Figure 2 – Illustration of the extended product with embedded motor system
3.1.4
extended product approach
EPA
methodology to determine the energy eficiency index (EEI) of the extended product (EP)
using the speed torque profiles of the driven equipment, the relative power losses of the
motor system and the duty profile of the application
Auxiliaries
Auxiliaries
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3.1.5
load-time profile
fraction of time spent at each operating point during the total operating time or a complete
cycle of operation of the extended product
Note 1 to entry: Typically this profile is represented by a histogram.
Note 2 to entry: The standby mode can be included in the load time profile.
3.1.6
motor control equipment
either a CDM or a motor starter
3.1.7
motor system
motor control equipment and a motor
3.1.8
semi analytic model
SAM
determination model for the losses of a motor system or a driven equipment
Note 1 to entry: SAMs include physical and mathematical parameters and calculation algorithm of the subparts of
an EP. SAMs are necessary to determine the typical relative power losses of the subparts of an EP in order to
determine its overall losses.
3.1.9
transmission
any component (coupling, Gear box, etc.) which connects the motor shaft to the load machine
(e.g. pump): coupling, gearbox
3.2 Symbols
3.2.1
...
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