1、NEMA Standards PublicationNational Electrical Manufacturers AssociationNEMA ICS 5 ANNEX E-2002 (R2008)Industrial Control and Systems: Additional Requirements for Proximity Switches Suitable for Use in Strong Magnetic FieldsNEMA Standards Publication ICS 5, Annex E-2002 (R2008) Industrial Control and
2、 Systems: Additional Requirements for Proximity Switches Suitable for Use in Strong Magnetic Fields Published by National Electrical Manufacturers Association 1300 North 17th Street, Suite 1752 Rosslyn, Virginia 22209 www.nema.org Copyright 2008 by the National Electrical Manufacturers Association.
3、All rights including translation into other languages, reserved under the Universal Copyright Convention, the Berne Convention for the Protection of Literary and Artistic Works, and the International and Pan American Copyright Conventions. NOTICE AND DISCLAIMER The information in this publication wa
4、s considered technically sound by the consensus of persons engaged in the development and approval of the document at the time it was developed. Consensus does not necessarily mean that there is unanimous agreement among every person participating in the development of this document. The National El
5、ectrical Manufacturers Association (NEMA) standards and guideline publications, of which the document contained herein is one, are developed through a voluntary consensus standards development process. This process brings together volunteers and/or seeks out the views of persons who have an interest
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10、f of any person or entity, nor is NEMA undertaking to perform any duty owed by any person or entity to someone else. Anyone using this document should rely on his or her own independent judgment or, as appropriate, seek the advice of a competent professional in determining the exercise of reasonable
11、 care in any given circumstances. Information and other standards on the topic covered by this publication may be available from other sources, which the user may wish to consult for additional views or information not covered by this publication. NEMA has no power, nor does it undertake to police o
12、r enforce compliance with the contents of this document. NEMA does not certify, test, or inspect products, designs, or installations for safety or health purposes. Any certification or other statement of compliance with any health or safetyrelated information in this document shall not be attributab
13、le to NEMA and is solely the responsibility of the certifier or maker of the statement. ICS 5, Annex E-2002 (R2008) Page i Copyright 2008 by the National Electrical Manufacturers Association. CONTENTS Page Forewordii 1 General . 1 1.1 Scope and Object. 1 2 Definitions 1 3 Classification. 1 3.1 Class
14、ification According to the Type of the Influencing Magnetic Field . 2 3.2 Immunity to an Alternating Magnetic Field. 2 3.3 Immunity to a Constant Magnetic Field 2 3.4 Immunity to an Alternating Field and to a Constant Magnetic Field 2 4 Construction and Performance Requirements 2 4.1 Frequency of Op
15、erating Cycles. 2 4.2 Inductive and Capacitive Proximity Switches . 2 4.3 Immunity to a Magnetic Field 2 4.4 Performance. 3 4.4.1 In an Alternating Magnetic Field. 3 4.4.2 In a Constant Magnetic Field . 3 5 Tests 3 5.1 Verification of Immunity 3 5.2 Immunity to an Alternating Magnetic Field. 3 5.3 I
16、nspection and Test Sequence (See Figure E1). 2 5.4 Results to be Obtained . 4 5.5 Immunity to a Constant Magnetic Field 4 5.6 Inspection and Test Sequence (See Figure E2). 4 5.7 Results to be Obtained . 5 Tables E1 Field Strength Calculation Current Versus Distance Chart 2 E2 Magnetic Field Classifi
17、cations .2 Figures E1 Examples of Test Configuration for Verification of the Immunity to an Alternating Field 4 E2 Example of Test Configuration for Verification of the Immunity in a Constant Magnetic Field .6 ICS 5, Annex E-2002 (R2008) Page ii Copyright 2008 by the National Electrical Manufacturer
18、s Association. Foreword This Standards Publication was prepared by a technical committee of the NEMA Industrial Automation Control Products and Systems Section. It was approved in accordance with the bylaws of NEMA and supersedes the indicated NEMA Standards Publication. This Standards Publication i
19、s an addition part to ICS 5-2000: Control-Circuit and Pilot Devices and will be included into that standards publication when it is next revised. Annex E provides additional requirements for proximity switches suitable for use in strong magnetic fields. NEMA Standards Publications are subject to per
20、iodic review. They are revised frequently to reflect user input and to meet changing conditions and technical progress. Proposed revisions to this Standards Publication should be submitted to: Vice President, Engineering Department National Electrical Manufacturers Association 1300 North 17th Street
21、, Suite 1752 Rosslyn, Virginia 22209 This standards publication was developed by the Industrial Automation Control Products and Systems Section. Section Approval of the standard does not necessarily imply that all section members voted for its approval or participated in its development. At the time
22、 it was approved, the Section was composed of the following members: ABB Control, Inc.Wichita Falls, TX Alstom Power ConversionPittsburgh, PA Automatic Switch CompanyFlorham Park, NJ Balluff, Inc.Florence, KY Carlo Gavazzi, Inc.Buffalo Grove, IL Control Concepts Corp.Beaver, PA Cooper BussmanSt. Lou
23、is, MO Cummins, Inc.Minneapolis, MN Cyberex LLCRichmond, VA Eaton CorporationMilwaukee, WI Echelon Corporation San Jose, CA Electro Switch CorporationWeymouth, MA Emerson Process ManagementAustin, TX Entrelec, Inc.Irving, TX GE Industrial SystemsPlainville, CT Hubbell IncorporatedMadison, OH Joslyn
24、Clark Controls, Inc.Lancaster, SC Lexington Switch - with the target located at 3 x snfrom the sensing face; - with the target located at 1/3 x snfrom the sensing face. ICS 5, Annex E-2002 (R2008) Page 4 Copyright 2008 by the National Electrical Manufacturers Association. E.5.4 Results to be Obtaine
25、d The state of the output shall not change by switching on and switching off /ref or during the time /ref current flows in the air-core inductor. After the test, the effective operating distance (sr) shall remain in accordance with subclause 7.2.1.3.1 of part 4. NOTE - For sensing face diameters lar
26、ger than 18 mm, the target in the off condition may be removed. Figure E1 EXAMPLES OF TEST CONFIGURATION FOR VERIFICATION OF THE IMMUNITY TO AN ALTERNATING FIELD 1 Sensor 2 Measuring instrument for the magnetic induction 3 Oscilloscope (to indicate the peak value) 4 Air-core inductor (the number of
27、windings is not stated) 5 AC ammeter A Alternating current I Proximity switch D Interior diameter of the air-core inductor 100 mm L Length of the air-core inductor 100 mm E.5.5 Immunity to a Constant Magnetic Field E.5.6 Inspection and Test Sequence (See Figure E2) NOTEOther test configurations may
28、be set up ICS 5, Annex E- 2002 (R2008) Page 5 Copyright 2008 by the National Electrical Manufacturers Association. The test shall be performed as follows: a) The sensor (1) for measuring the magnetic induction shall be arranged in the centre of the air gap between the iron cores (3). b) The inductan
29、ce coils (4) shall be energized with direct current (A) until the measuring instrument for the magnetic induction (2) shows the magnetic induction values shown in Table E.2. The value /refof the current shall be noted. c) The sensor (1) is removed and the proximity switch (I) shall be arranged in th
30、e middle of the air gap between the iron cores (3) and so that the sensing face is in line with the outsides of the iron cores (3). d) The effective operating distance srshall be measured by axis approach of the target with the direct current A being adjusted to each of the following values: 0 /ref0
31、,2 /ref0,4 /ref0,6 /ref0,8 /ref1,0 /refE.5.7 Results to be Obtained In the whole range of the direct current A, the deviation of the effective operating distance srshall be within 30 % of the value measured at 0 /ref. ICS 5, Annex E-2002 (R2008) Page 6 Copyright 2008 by the National Electrical Manuf
32、acturers Association. 1 Sensor 2 Measuring instrument for the magnetic induction 3 Iron core of the magnetic inductor (inner diameter of iron core = 100 mm) 4 Inductance coils 5 DC ammeter A Direct current I Proximity switch AS Air gap between core (3) 2 x proximity switch diameter with a minimum of
33、 40 mm. NOTEFor test purposes, the parts of the proximity switch affected by the magnetic field may be separated from the rest of the switch. Figure E2 EXAMPLE OF TEST CONFIGURATION FOR VERIFICATION OF THE IMMUNITY IN A CONSTANT MAGNETIC FIELD NATIONAL ELECTRICAL MANUFACTURERS ASSOCIATION 1300 NORTH 17TH STREET, SUITE 900 ROSSLYN. VA 22209www.NEMA.orgTO ORDER ADDITIONAL NEMA STANDARDS VISITWWW.GLOBAL.IHS.COM OR CALL 1-800-854-7179/1-303-397-79565612_0514TB
