1、 STD.CENELEC EN 50 227-ENGL 1997 3404583 DL83033 T58 m RATIFIED EUROPEAN TEXT EN50227: 1997 European Standards only exist formally as national transpositions (Le. a BS EN for the UK) of a commonly agreed “ratified” text. This document is a ratified text which will shortly be published as a BS EN. It
2、 is being made available in advance of its formal publication to give interested parties early access to the technical information which the BS EN will contain. When the BS EN is formally published it will be supplied to you automatically, without any additional charge. Purchasers of this ratified t
3、ext should be aware of the following limitations when using the document. 0 The BS EN may contain additional information in the national foreword or national annex, Full rights conferred by compliance with the standard may only be granted by reference to the formal national transposition of the text
4、 as a BS EN. This ratified text was approved by CENICENELEC in its three officiai languages on the date given below. Under CENKENELEC rules, BSI is obliged to publish its national transposition within six months of this date. This ratified text was approved on I 1996- 10-0 1 I NO COPYIlriG WITHOUT E
5、S1 PERMISSION EXCEPT AS PEKMITTED BY COPYKIGHT LAW EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 50227 October 1997 ICC 29.120.60 Descriptors: Control circuit devices, proximity sensor, interface, switching element English version Control circuit devices and switching elements proximity senso
6、rs, d.c. interface for proximity sensors and switching amplifiers (NAMUR) Appareils et lments de commutation pour circuit de commande, Nherungssensoren interface DC pour capteurs de proximit et amplificateurs de commutation (NAM U R) Steuergerte und Schaltelemente Gleichstrom-Schnittstelle fr Nherun
7、gssensoren und Schaltverstrker (NAMUR) This European Standard was approved by CENELEC on 1996-1 0-01. CENELEC members are bound to comply with the CENICENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteratio
8、n. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CENELEC member. This European Standard exists in three official versions (English, French, German). A version in any other language made by transl
9、ation under the responsibility of a CENELEC member into its own language and notified to the Central Secretariat has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland
10、, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CENELEC European Committee for Eiectrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central secretariat: rue de Stassart 35,
11、 B - 1050 Brussels 1997 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 50227:1997 E STD-CENELEC EN 50 227-ENGL L777 H 3404583 0383035 820 H Page 2 EN 50227:1997 Foreword This European Standard was prepared by the Technical Commit
12、tee CENELEC TC 178, Low-voltage switchgear and controlgear including dimensional standardization. The text of the draft was submitted to the Unique Acceptance Procedure and was approved by CENELEC as EN 50227 on 1996-10-01. The following dates were fixed: - latest date by which the EN has to be impl
13、emented at national level by publication of an identical national standard or by endorsement with the EN have to be withdrawn - latest date by which the national standards conflicting (dopl 1998-04-01 (dow) 1998-04-01 Page 3 EN 50227: 1997 1. SCOPE This standard applies to proximity sensors connecte
14、d for operation by a two-wire connecting conductor 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. Note 1 : These devices can be used in an explo
15、sive atmosphere if they also comply with EN 50020 “Electrical equipment for explosive atmospheres. intrinsic safety i“. These devices have been defined by the German organization “Normenausschu - fur Me-2nd Regelungstechnik (NAMUR)“ 2: 2. NORMATIVE REFERENCES EN 50020 EN 60529 EN 60947-5-2 Electrica
16、l equipment for explosive atmospheres, intrinsic safety “i“ (CENETEC specification for flame- proof and explosion-protected electrical equipment) Degrees of protection provided by enclosures (IP Code) (IEC 605291 Low-voltage switchgear and controlgear Part 5: Control circuit devices and switching el
17、ements Section 2: Proximity switches (IEC 60947-5-2, modified) Page 4 EN 50227: 1 997 Additional standards EN 50008 EN 50010 EN 50025 EN 50026 EN 50032 EN 50036 EN 50037 EN 50038 EN 50040 EN 50044 Industrial low-voltage switchgear; inductive proximity switches, form A, for d.c. voltage, 3 or 4 conne
18、ctions Industrial low-voltage switchgear; inductive proximity switches; measuring methods for determining switching frequency industrial low-voltage switchgear; inductive proximity switches, shape C, for d.c. voltage, 3 or 4 connections Industrial low-voltage switchgear; inductive proximity switches
19、, shape D, for d.c. voltage, 3 or 4 connections Industrial low-voltage switchgear; inductive proximity switches, definitions, classification. designation Industrial low-voltage switchgear; inductive proximity switches, shape A, for a.c. voltage, 2 connections Industrial low-voltage switchgear; induc
20、tive proximity switches, shape C, for a.c. voltage, 2 connections Industrial low-voltage switchgear; inductive proximity switches, shape O, for a.c. voltage, 2 connections Industrial low-voltage switchgear; inductive proximity switches, shape A, for d.c. voltage, 2 connections Industrial low-voltage
21、 switchgear; inductive proximity switches, designation of connections 3. DEFINITIONS 3.1 Proximity sensor Converts the travel of an influencing body relative to it into an output signal. The proximity sensor is preferably contactless (e. g. inductive, capacitive, magnetic, photoelectric). Note: The
22、proximity sensor may be operated with or without mechanical contact. 3.2 Switching amplifier The switching amplifier 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 semiconductor swit
23、ching element. STD-CENELEC EN 50 227-ENGL 3797 aii 3404583 0383038 53T E 3.3 3.4 3.5 3.6 3.7 3.8 Page 5 EN 50227: 1997 Control circuit The proximity sensor and the control input of the switching amplifier together with the two-wire connecting conductor, form the control circuit of the system describ
24、ed here. Output signai of the proximity sensor The output current as a function of the variable internal resistance. Distancekurrent characteristic of the proximity sensor The relationship of the output signal (the current value) in the steady state to the distance of the influencing body relative t
25、o the sensor. Both continuous and discontinuous characteristics are permitted (see subclauses 5.3 and 5.4 and figures 1 and 2). Actuating range (Ali) A range defined by 4 straight lines in the current-voltage graph of the control input of the switching amplifier to which is assigned a switching func
26、tion of the switching amplifier. There are 3 actuating ranges covered by the current-voltage characteristic of the control inp-ut (see figure 3 a,b and d). Slope The change in the continuous characteristic of a proximity sensor in the actuating range (AIA) (see figure 1). Note: The slope can assume
27、different values within the control span. Operating frequency 3.8.1 Operating frequency of the proximity sensor The maximum switching frequency achieved through periodic influencing at which the limits of the actuating range (A 11) are reached (see figures 1 and 2). 3.8.2 Operating frequency and swi
28、tching time(s) of the switching amplifier These are determined when the input signal is changed discontinuously between the limit values of the actuating range (Ali). - STD.CENELEC EN 50 227-ENGL 1777 3404583 0383039 47b m Page 6 EN 50227:1997 3.9 3.1 O 3.1 1 3.12 3.1 3 3.14 4. 4.7 Switching current
29、 difference Change in control current within the actuating range (A li) at which the switching amplifier changes its output signal (see figures 1,2 and 3). Switching :-ave1 difference Travel of the influencing body which changes the output signal of the switching amplifier. With discontinuous charac
30、teristic of the proximity sensor, the switching travel difference is identical to the control span s. Line resistance The effective resistance of the two-wire connecting conductor between the switching amplifier and the proximity sensor. Insulation resistance The effective resistance between the wir
31、es of the two-wire conductor connecting the switching amplifier to the proximity sensor. Time delay before availability (tv) The time between the switching ON of the supply voltage and the instant at which the proximity sensor becomes ready to operate correctly. Control span s The travel of the infl
32、uencing body in which the actuating range (AIA) is operative. With a discontinuous characteristic, the control span is identical to the switching travel difference (see figures 1 and 2). CLASSIFICATION Classification according to *NAMUR function* The ability to have NAMUR function is designated by a
33、 capital letter N placed in the eighth position. STD.CENELEC EN 50 227-ENGL i797 m 3404583 033040 i78 rn Page 7 EN 50227: 1997 Table 1 - Classification of proximity switches 1st plldlgl SENSINO MEANS 3.1 I = InductM c = capacm U=urtraSMK: D = dim refl. PM- R = retm. pot&ectnC T = through kam phot#(.
34、 d.c. S=othar B = NC (break) P= prooRmmi* by- S=othcr I Bth pai1 dipit w “cm 41 N =NAMUR function Note: This table is in line with table 1 of EN 60947-5-2 5. CHARACTERISTICS 5.1 Control input of the switching amplifier The binary output signal of the switching amplifier shall only change when the op
35、erating point of the control circuit 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
36、reaches the “high impedance“ and “low impedance“ states. The “high impedance“ state is shown in figure 4 and the “low impedance“ state in figure 5. Note: lhe limits for the permitted characteristic range of proximity sensor and switching amplifier have been selected so as to provide a safety margin.
37、 STD-CENELEC EN 50 227-ENGL 1977 1404583 0183041 O24 Page 8 EN 50227:1997 5.3 Continuous Characteristic Within the actuating range (Ali): a) The output signal of the proximity sensor shall be adjustable. b) The slope of the characteristic shall be either positive or negative and (See the example in
38、figure 1 ). there shall be no hysteresis. 5.4 Discontinuous characteristic Within the actuating range (Ali) the output signal of the proximity sensor shall not be adjustable and the characteristic shall have hysteresis. (See the example in figure 2). 5.5 Switching cunent difference The preferred val
39、ue of the switching current difference is 0.2 mA. The preferred position of the switching current difference is the center of the actuating range (Ali). 5.6 Line resistance 5.7 Insulation resistance The line resistance shall not exceed 50 R. The insulation resistance shall not be less than 1MR. 6. P
40、RODUCT INFORMATION The following characteristic data shall be stated by the manufacturer together with details of the measuring procedure: 6.1 Proximity sensor a) Operating frequency b) Slope with continuous characteristic c) Switching travel difference with discontinuous characteristic d) Rated ope
41、rating distance e) Time delay before availability The above data shall be related to the rated operating conditions according to sub-clause 9.2. 1TD.CENELEC EN 50 227-ENGL 1997 3404583 0383042 TbO Page 9 EN 50227 997 f) Operating, transport and storage temperature range g) Direction of action, i. e.
42、 details of how the low impedance or high h) Installation instruction i) IP degree of protection (according to EN 60529) j) Influence of variations of the supply voltage and ambient temperature on impedance state is reached the characteristic data 6.2 4 4 rn 7. 7.1 7.1.1 Switching amplifier a) Rated
43、 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 e) Operating, transport and storage temperature range f) Assignment of the output signals to the monitoring and actuating ranges g
44、) Description of the output signals h) Influence of variations of the supply voltage and the ambient temperature on the characteristic data i ) I n s t a I la t i o-n i n s t r u ct i on j) IP degree of protection (according to EN 60529) accordance with c) NORMAL SERVICE, MOUNTING AND TRANSPORT COND
45、ITIONS Normal service conditions Proximity sensors and switching amplifiers complying with this standard shall be capable of operating under the following standard conditions. Ambient temperature (during operation) The operating characteristics shall be maintained over the permissible range of ambie
46、nt temperature 7.1.1.1 Inductive, capacitive and magnetic proximity sensors They shall operate in an ambient temperature between -25“ C and + 70“ C. Page 10 EN 50227:1997 3 mA 2 1 I 1 1 O STD.CENELEC EN 50 227-ENGL 3777 3404583 0383043 9T7 Switching points Switching current /I 1 difference - 2.1 I h
47、 I r - a - 1.2 T 7.2 Photoelectric proximity sensors They shall operate in an ambient temperature between -5“ C and + 55“ C. 7.1.1.3 Switching amplifiers They shall operate in an ambient temperature between - 5C and +So C. 7.1.2 Altitude 6.1.2. of part 1 applies 7.3 Climatic conditions 7.1.3.1 Humid
48、ity The relative humidity (RH) of the air shall not exceed 50 % at 70“ C. Higher relative humidities are permitted at lower temperatures, e. g. 90 % at + 20“ C. Note: Condensation on the sensing face and the change of humidity may influence the operating distances. Care should be taken of conden- sa
49、tion which may occur due to variations in temperature (50 % RH at 70“ C is equivalent to 100 Oh RH at 54“ C). Switiching travel difference sensor STD-CENELEC EN 50 227-ENGL 1997 R 3404583 0183u44 833 R Type Function Wire coloun NAMUR (high impedance) + Brown . (low impedance) + Brown SENSOR - Blue Page 11 EN 50227:1997 Terminal number 1 4 1 3 mA t2 1 1 O 2,l - 1.2 distance s- Figure 2. Example of a discontinous characteristic of a proximity sensor 7.1.3.2 Pollution degree Unless otherwise stated by the manufacturer, a proximity sensor is i
