1、BRITISH STANDARD BS EN 60947-5-6:2001 IEC 60947-5-6:1999 Low-voltage switchgear and controlgear Part 5-6: Control circuit devices and switching elements DC interface for proximity sensors and switching amplifiers (NAMUR) The European Standard EN 60947-5-6:2000 has the status of a British Standard IC
2、S 29.130.20 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBS EN 60947-5-6:2001 This British Standard, having been prepared under the direction of the Electrotechnical Sector Committee, was published under the authority of the Standards Committee and comes into effect on 15 Ju
3、ne 2001 BSI 06-2001 ISBN 0 580 37438 6 National foreword This British Standard is the official English language version of EN 60947-5- 6:2000. It is identical with IEC 60947-5-6:1999. The UK participation in its preparation was entrusted by Technical Committee PEL/ 17, Switchgear controlgear and HV-
4、LV co-ordination, to Subcommittee PEL/ 17/ 2, Low voltage switchgear and controlgear, which has the responsibility to: A list of organizations represented on this subcommittee can be obtained on request to its secretary. From 1 January 1997, all IEC publications have the number 60000 added to the ol
5、d number. For instance, IEC 27-1 has been renumbered as IEC 60027-1. For a period of time during the change over from one numbering system to the other, publications may contain identifiers from both systems. Cross-references Attention is drawn to the fact that CEN and CENELEC Standards normally inc
6、lude an annex which lists normative references to international publications with their corresponding European publications. British Standards which implement these international or European publications may be found in the BSI Standards Catalogue under the section entitled “International Standards
7、Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard do
8、es not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European deve
9、lopments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 15, and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. Amendments issued since publicatio
10、n Amd. No. Date CommentsPage2 EN6094756:2000 BSI 06-2001 CONTENTS Page Clause 1 Scope 4 2 Normative references 4 3 Definitions. 4 4 Classification. 6 5 Characteristics 7 5.1 Control input of the switching amplifier . 7 5.2 Interaction between proximity sensor and switching amplifier . 7 5.3 Continuo
11、us characteristic . 7 5.4 Discontinuous characteristic. 7 5.5 Switching current difference . 7 5.6 Line resistance. 7 5.7 Insulation resistance. 7 6 Product information . 8 6.1 Proximity sensors . 8 6.2 Switching amplifiers 8 7 Normal service, mounting and transport conditions 9 7.1 Normal service c
12、onditions. 9 7.2 Connection identification and marking .11 7.3 Conditions during transport and storage 11 7.4 Electromagnetic compatibility (EMC) .11 8 Constructional and performance requirements11 9 Tests11 9.1 Switching amplifier 11 9.2 Proximity sensor12 9.3 Results to be obtained.13 9.4 Verifica
13、tion of the electromagnetic compatibility 14 Figure 1 Example of a continuous characteristic of a proximity sensor . 10 Figure 2 Example of a discontinuous characteristic of a proximity sensor. 10 Figure 3 Control input of the switching amplifier 12 Figure 4 Characteristics of proximity sensor in th
14、e high impedance state . 13 Figure 5 Characteristics of proximity sensor in the low impedance state 14 Table 1 Classification of proximity switches6 Table 2 Connection and wiring identification. 11 Annex ZA (normative) Normative references to international publications with their corresponding Europ
15、ean publications 15 Page3 EN6094756:2000 BSI 06-2001 LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR Part 5-6: Control circuit devices and switching elements DC interface for proximity sensors and switching amplifiers (NAMUR) 1 Scope This International Standard applies to proximity sensors connected for oper
16、ation by a two-wire connecting cable to the control input of a switching amplifier. The switching amplifier contains a d.c. source to supply the control circuit and is controlled by the variable internal resistance of the proximity sensor. These devices can be used in an explosive atmosphere if they
17、 also comply with IEC 60079-11. NOTE These devices have been defined by the German organization “Normenausschu fr Me- und Regelungstechnik (NAMUR)” (Office for Standardization of Measurement and Regulation Techniques). 2 Normative references The following normative documents contain provisions which
18、, through reference in this text, constitute provisions of this International Standard. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this International Standard are encouraged to investigate the possi
19、bility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies. Members of IEC and ISO maintain registers of currently valid International Standards. IEC 60079-11:1999, Electrical appara
20、tus for explosive gas atmospheres Part 11: Intrinsic safety “i” IEC 60947-1:1999, Low-voltage switchgear and controlgear Part 1: General rules IEC 60947-5-2:1999, Low-voltage switchgear and controlgear Part 5-2: Control circuit devices and switching elements Proximity switches 3 Definitions For the
21、purpose of this International Standard the following definitions apply. 3.1 proximity sensor device which converts the travel of an influencing body relative to it into an output signal NOTE 1 The proximity sensor is preferably contactless (e.g. inductive, capacitive, magnetic, photoelectric). NOTE
22、2 The proximity sensor may be operated with or without mechanical contact. 3.2 switching amplifier device which converts the signal from the proximity sensor presented at the control input into a binary output signal which may be produced e.g. by an electromagnetic relay or a semi- conductor switchi
23、ng element Page4 EN6094756:2000 BSI 06-2001 3.3 control circuit system comprising the proximity sensor, the control input of the switching amplifier and the two-wire connecting cable 3.4 output signal of the proximity sensor output current as a function of the variable internal resistance 3.5 distan
24、ce/current characteristic of the proximity sensor relationship of the output signal (the current value) in the steady state to the distance of the influencing body relative to the sensor. Both continuous and discontinuous characteristics are permitted (see 5.3 and 5.4, and figures 1 and 2) 3.6 actua
25、ting range ( I 1 ) range defined by four straight lines in the current-voltage graph of the control input of the switching amplifier to which is assigned a switching function of the switching amplifier. There are three actuating ranges covered by the current-voltage characteristic of the control inp
26、ut (see figure 3, a, b and d) 3.7 slope change in the continuous characteristic of a proximity sensor in the actuating range ( I 1 ) (see figure 1) NOTE The slope can assume different values within the control span. 3.8 maximum-operating frequency of the proximity sensor maximum switching frequency
27、achieved through periodic influencing at which the limits of the actuating range ( I 1 ) are reached (see figures 1 and 2) 3.9 switching current difference change in control current within the actuating range ( I 1 ) at which the switching amplifier changes its output signal (see figures 1, 2 and 3)
28、 3.10 switching travel difference travel of the influencing body which changes the output signal of the switching amplifier. With a discontinuous characteristic of the proximity sensor, the switching travel difference is identical to the control span s 3.11 line resistance effective resistance of th
29、e two-wire connecting cable between the switching amplifier and the proximity sensor Page5 EN6094756:2000 BSI 06-2001 3.12 insulation resistance effective resistance between the wires of the two-wire cable connecting the switching amplifier to the proximity sensor 3.13 time delay before availability
30、 (t v ) time between the switching on of the supply voltage and the instant at which the proximity sensor becomes ready to operate correctly 3.14 control span ( s) travel of the influencing body in which the actuating range ( I 1 ) is operative. With a discontinuous characteristic, the control span
31、is identical to the switching travel difference (see figures 1 and 2) 4 Classification Proximity switches are classified according to various general characteristics as shown in table 1. The ability to fulfil the requirements of the present standard is designated by a capital letter N placed in the
32、eighth position. Table 1 Classification of proximity switches 1st position 1 digit 2nd position 1 digit 3rd position 3 digits 4th position 1 digit 5th position 1 digit 6th position 1 digit 8th position 1 digit SENSING MEANS MECHANICAL INSTALLATION CONSTRUCT. FORM AND SIZE SWITCHING ELEMENT FUNCTION
33、TYPE OF OUTPUT METHOD OF CONNECTION NAMUR FUNCTION I = inductive C = capacitive U = ultrasonic D = diffuse reflective photoelectric R = retroreflective photoelectric T = through beam photoelectric 1 = embeddable 2 = non- embeddable 3 = either FORM (1 capital letter) A = cylindrical threaded barrel B
34、 = cylindrical smooth barrel C = rectangular with square cross-section D = rectangular with rectangular cross-section SIZE (2 numbers) for diameter or side length A = NO (make) B = NC (break) P = programmable by user S = other D = 2 terminal d.c. S = other 1 = integral leads 2 = plug-in 3 = screw 9
35、= other N = NAMUR function NOTE This table is an extension of table 1 of IEC 60947-5-2. Page6 EN6094756:2000 BSI 06-2001 5 Characteristics 5.1 Control input of the switching amplifier The binary output signal of the switching amplifier shall only change when the operating point of the control circui
36、t is within the relevant actuating range (see figure 3). 5.2 Interaction between proximity sensor and switching amplifier The proximity sensor shall be designed in such a way, that when actuated by the intended influence the current-voltage characteristic reliably reaches the “high impedance” and “l
37、ow impedance” states. The “high impedance” state is shown in figure 4 and the “low impedance” state in figure 5. NOTE The limits for the permitted characteristic range of the proximity sensor and the switching amplifier have been selected so as to provide a safety margin. 5.3 Continuous characterist
38、ic Within the actuating range ( I 1 ): a) the output signal of the proximity sensor shall be adjustable; b) the slope of the characteristic shall be either positive or negative and there shall be no hysteresis (see the example in figure 1). 5.4 Discontinuous characteristic Within the actuating range
39、 ( I 1 ): a) the output signal of the proximity sensor shall not be adjustable, and b) the characteristic shall have hysteresis (see the example in figure 2). 5.5 Switching current difference The preferred value of the switching current difference is 0,2 mA. The preferred position of the switching c
40、urrent difference is the centre of the actuating range ( I 1 ). 5.6 Line resistance The line resistance shall not exceed 50 . 5.7 Insulation resistance The insulation resistance shall not be less than 1 M . Page7 EN6094756:2000 BSI 06-2001 6 Product information Characteristic product data shall be s
41、tated by the manufacturer together with details of the measuring procedure. 6.1 Proximity sensors For proximity sensors such characteristic data shall include the following: a) operating frequency; b) slope with continuous characteristic; c) switching travel difference with discontinuous characteris
42、tic; d) rated operating distance; e) time delay before availability. The above data shall be related to the rated operating conditions according to 9.2. f) operating, transport and storage temperature range; g) direction of action, i.e. details of how the low impedance or high impedance state is rea
43、ched; h) installation instructions; i) IP degree of protection (according to IEC 60947-1, annex C); j) influence of variations of the supply voltage and ambient temperature on the characteristic data. 6.2 Switching amplifiers For switching amplifiers the data to be provided by the manufacturer shall
44、 include the following: a) rated supply voltage(s); b) operating frequency and switching times; c) switching current difference; d) position of the switching points for the switching current difference in accordance with c); e) operating, transport and storage temperature range; f) assignment of the
45、 output signals to the monitoring and actuating ranges; g) description of the output signals; h) influence of variations of the supply voltage and the ambient temperature on the characteristic data; i) installation instruction; j) IP degree of protection (according to IEC 60947-1, annex C). Page8 EN
46、6094756:2000 BSI 06-2001 7 Normal service, mounting and transport conditions 7.1 Normal service conditions Proximity sensors and switching amplifiers complying with this standard shall be capable of operating under the following conditions. 7.1.1 Ambient temperature (during operation) The operating
47、characteristics shall be maintained over the permissible range of ambient temperature. 7.1.1.1 Inductive, capacitive and magnetic proximity sensors These shall operate in an ambient temperature between 25 C and +70 C. 7.1.1.2 Photoelectric proximity sensors These shall operate in an ambient temperat
48、ure between 5 C and +55 C. 7.1.1.3 Switching amplifiers These shall operate in an ambient temperature between 5 C and +55 C. 7.1.2 Altitude Subclause 6.1.2 of IEC 60947-1 applies. 7.1.3 Climatic conditions 7.1.3.1 Humidity The relative humidity (RH) of the air shall not exceed 50 % at 70 C. Higher r
49、elative humidities are permitted at lower temperatures, e.g. 90 % at 20 C. NOTE Condensation on the sensing face and changes of humidity may influence the operating distances. Care should be taken concerning condensation which may occur due to variations in temperature (50 % RH at 70 C is equivalent to 100 % RH at 54 C). Page9 EN6094756:2000 BSI 06-2001 Switching points Switching distance difference Switching current differenc
