1、September 2007DEUTSCHE NORM English price group 10No part of this standard may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).ICS 25.160.10!$IBn“13831
2、75www.din.deDDIN EN ISO 17657-2Resistance welding Welding current measurement for resistance welding Part 2: Welding current meter with current sensing coil(ISO 17657-2:2005)English version of DIN EN ISO 17657-2:2007-09Widerstandsschweien Schweistrommessung fr das Widerstandsschweien Teil 2: Schweis
3、trommessgerte mit Strommessspule (ISO 17657-2:2005)Englische Fassung DIN EN ISO 17657-2:2007-09SupersedesDIN ISO 17657-2:2006-02www.beuth.deDocument comprises 17 pages 11.07DIN EN ISO 17657-2:2007-09 2 National foreword This standard has been prepared by Technical Committee ISO/TC 44 “Welding and al
4、lied processes”, Subcommittee SC 6 “Resistance welding” (Secretariat: DIN, Germany) and has been adopted as EN ISO 17657-2:2007 by Technical Committee CEN/TC 121 “Welding”. The responsible German body involved in its preparation was the Normenausschuss Schweitechnik (Welding Standards Committee), Jo
5、int Committee NA 092-00-12 AA Widerstandsschweien (DVS AG V 3). DIN EN ISO 17657 consists of the following parts, under the general title Resistance welding Welding current measurement for resistance welding: Part 1: Guidelines for measurement Part 2: Welding current meter with current sensing coil
6、Part 3: Current sensing coil Part 4: Calibration system Part 5: Verification of welding current measuring system The DIN Standard corresponding to the International Standard referred to in the EN is as follows: ISO 669 DIN ISO 669 Amendments This standard differs from DIN ISO 17657-2:2006-02 as foll
7、ows: a) The text of ISO 17657-2 has been adopted by CEN without any modification. Previous editions DIN ISO 17657-2: 2006-02 National Annex NA (informative) Bibliography DIN ISO 669, Resistance welding Resistance welding equipment Mechanical and electrical requirements EUROPEAN STANDARDNORME EUROPEN
8、NEEUROPISCHE NORMEN ISO 17657-2June 2007ICS 25.160.10English VersionResistance welding - Welding current measurement forresistance welding - Part 2: Welding current meter with currentsensing coil (ISO 17657-2:2005)Soudage par rsistance - Mesurage des courants ensoudage par rsistance - Partie 2: Ampr
9、emtre avec torede mesure de courant (ISO 17657-2:2005)Widerstandsschweien - Schweistrommessung fr dasWiderstandsschweien - Teil 2: Schweistrommessgertemit Strommessspule (ISO 17657-2:2005)This European Standard was approved by CEN on 19 May 2007.CEN members are bound to comply with the CEN/CENELEC I
10、nternal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the CEN Management Centre or to any CEN me
11、mber.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as theofficial versions.CEN members
12、 are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Sweden, Switz
13、erland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: rue de Stassart, 36 B-1050 Brussels 2007 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN I
14、SO 17657-2:2007: EPage 2 EN ISO 17657-2:2007 (E) Contents Foreword3 Introduction.4 1 Scope 5 2 Normative references 5 3 Terms and definitions .5 4 Physical environment and operating conditions .6 5 Classification of welding current meters with their current sensing coil, and designation of product6
15、5.1 Classes of welding current meter with current sensing coil 6 5.2 Designation of product .7 6 Requirements for welding current meter with current sensing coil 7 6.1 Welding current meter.7 6.2 Current sensing coil 7 6.3 Welding current meter with its current sensing coil8 6.4 Integrator 8 6.5 Dat
16、a processing unit .8 6.6 Display unit and output ports.8 6.7 Minimum and maximum duration of welding current8 6.8 Maximum measuring current9 6.9 Minimum measuring current 9 6.10 Phase-controlled current 9 6.11 Minimum time for current measurement.9 6.12 Fluctuation of supply voltage.9 6.13 Mechanica
17、l strength of current sensing coil 9 6.14 Setting position error of current sensing coil 9 6.15 Influence of ambient temperature9 6.16 Test. 10 6.16.1 Type test 10 6.16.2 Acceptance test 10 7 Test procedures 10 7.1 Maximum measuring current. 10 7.2 Minimum measuring current . 10 7.3 Phase-controlled
18、 current . 11 7.4 Minimum time for current measurement 11 7.5 Fluctuation of supply voltage 11 7.6 Thermal test. 12 8 Annex A (normative) Definition of indicated measuring time and its indicated current value 13 A1 Indicated measuring time 13 A2 Welding current value for the indicated measuring time
19、 . 14 Annex B (informative) Set-up of a current sensing coil and construction of welding current meters 15 Marking 12 Foreword The text of ISO 17657-2:2005 has been prepared by Technical Committee ISO/TC 44 “Welding and allied processes” of the International Organization for Standardization (ISO) an
20、d has been taken over as EN ISO 17657-2:2007 by Technical Committee CEN/TC 121 “Welding”, the secretariat of which is held by DIN. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by December 2007, an
21、d conflicting national standards shall be withdrawn at the latest by December 2007. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, De
22、nmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. Endorsement notice The text of ISO 17657-2:2005 has been approv
23、ed by CEN as EN ISO 17657-2:2007 without any modifications. 3 EN ISO 17657-2:2007 (E) Introduction Requests for official interpretations of any aspect of this part of ISO 17657 should be directed to the Secretariat of ISO/TC 44/SC 6 via your national standards body. A complete listing of these bodie
24、s can be found at http:/www.iso.org. 4 EN ISO 17657-2:2007 (E) 1 Scope This part of ISO 17657 specifies a welding current meter with a current sensing coil to measure the weld time and the r.m.s. value of the welding current during a certain interval using single-phase alternating current of frequen
25、cy of 50 Hz or 60 Hz, or direct current. This part of ISO 17657 is applicable for a welding current measuring system, with a display or calibrated output port, which may be connected to a welding controller. 2 Normative references The following referenced documents are indispensable for the applicat
26、ion 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. ISO 669, Resistance welding Resistance welding equipment Mechanical and electrical requirements ISO 17657-1:2005, Resi
27、stance welding Welding current measurement for resistance welding Part 1: Guidelines for measurement ISO 17657-3:2005, Resistance welding Welding current measurement for resistance welding Part 3: Current sensing coil ISO 17657-4:2005, Resistance welding Welding current measurement for resistance we
28、lding Part 4: Calibration system 3 Terms and definitions For the purposes of this document, the terms and definitions given in ISO 669 and the following apply. 3.1 minimum measuring time minimum settable value of the measuring time See Figure A.1. 3.2 maximum measuring time maximum settable value of
29、 the measuring time, which will depend on the types of component making up the welding current meter See Figure A.1. 5 EN ISO 17657-2:2007 (E) 3.3 indicated measuring time duration of measuring time, from start time to finish time, while the welding current is flowing NOTE Normally the start and fin
30、ish times for measuring current flow are automatically set. If the start time is set at zero or at a value greater than zero, and the finish time is set at a smaller value than the weld time, as shown in Figure A.1, then the welding current is calculated for the measuring duration between the start
31、time and the finish time. 3.4 automatic zero level correction device that allows removal of the effect of zero drift of output when direct welding current measurement is incorporated 3.5 drift amount of shift in the zero position 3.6 measuring accuracy scatter limit of indicated or output values per
32、missible, which is indicated against the full scale value 4 Physical environment and operating conditions Unless otherwise specified, the welding current meter shall be capable of operating under the following conditions without any adverse effect on its accuracy: at an ambient air temperature betwe
33、en of +5 C and +40 C; in relative humidity up to 95 %; at altitudes up to 1 000 m above mean sea level; where gas, fine dust, oil mist, spatters, etc. are included in the air such as those caused by ordinary arc or spot welding work. When the operating conditions deviate from those specified above,
34、an agreement shall be made between the manufacturer and the purchaser. 5 Classification of welding current meters with their current sensing coil, and designation of product 5.1 Classes of welding current meter with current sensing coil Welding current meters with their current sensing coil are clas
35、sified as in Table 1 depending on the measuring accuracy. Table 1 Classification of welding current meters with current sensing coil by measuring accuracy Classification Measuring accuracy Application Highly accurate class 1,0 % of full scale Laboratory use Accurate class 2,0 % of full scale Routine
36、 use for highly accurate systems Ordinary class 5,0 % of full scale Routine use for ordinary systems 6 EN ISO 17657-2:2007 (E) 5.2 Designation of product The following shall be indicated: current type that can be measured i.e. alternating current and/or direct current; maximum current measurable; sp
37、ecified accuracy as a welding current meter. EXAMPLE 1 Only single-phase alternating current measurable, ordinary class, and maximum measuring current value of 15 kA. 15 kA ac class 5.0 EXAMPLE 2 Single-phase alternating current and direct current measurable, accurate class, and maximum measuring cu
38、rrent value of 20 kA. 20 kA ac/dc class 2.0 6 Requirements for welding current meter with current sensing coil 6.1 Welding current meter The welding current meter shall consist of a data processing unit, and a display of the welding current and weld time. An example of the construction is illustrate
39、d in Annex B. The welding current shall be indicated as at least the true r.m.s. (root-mean-square) value. The weld time should be counted on a cycle basis or the length indicated in milliseconds, calculated as the product of the length of 1 cycle and the number of cycles. Welding current meters alo
40、ne (without the current sensing coil) are classified as in Table 2 depending on the measuring accuracy. Table 2 Requirements for measuring accuracy of welding current meters Classification Measuring accuracy Application Highly accurate class 0,5 % of full scale Laboratory use Accurate class 1,0 % of
41、 full scale Routine use for highly accurate systems Ordinary class 2,0 % of full scale Routine use for ordinary systems The scatter shall be checked against the rated value of the test welding current meter in accordance with the test procedures specified in ISO 17657-4. 6.2 Current sensing coil The
42、 current sensing coil shall conform to requirements described in ISO 17657-3. The conversion coefficient of the current sensing coil should coincide with requirements of the integrator built into the welding current meter, and the value of the low-inductive output resistor shall meet the requirement
43、 specified by the supplier for the current sensing coil itself. 7 EN ISO 17657-2:2007 (E) 6.3 Welding current meter with its current sensing coil The error of the welding current meter with its coil should be adjusted together with that of the welding current meter and its current sensing coil. If i
44、t is necessary to change the current sensing coil, the welding current measuring system shall be calibrated with a reference welding current measuring system. The error of welding current measuring system should be calculated with the sum of both error values of the welding current meter and its cur
45、rent sensing coil, or determined by measurements for a welding current meter with its current sensing coil. The maximum error of welding current measuring systems within the measuring range shall be within the measuring accuracy stipulated in Table 1 corresponding to required class. 6.4 Integrator T
46、he integrator for processing the output signal from the current sensing coil shall be designed to allow the measurement of at least full-wave alternating current and heat-controlled alternating current. The output signal should not be clipped or distorted by the supply voltage to the integrator. NOT
47、E When the welding current meter is applied for measuring the medium-frequency alternating current or medium-frequency direct current, an agreement may be needed between the manufacturer and the purchaser. 6.5 Data processing unit The data processing unit consists of at least an analog-digital conve
48、rter, memories and CPU. The values shall be kept in the memory until the next measurement. The computing algorithm shall be designed to obtain a true r.m.s. value of the welding current. The start time and finish time used for the calculation shall comply with Annex A to this part of ISO 17657 and t
49、o ISO 17657-1:2005. Annex A to this part of ISO 17657 and to ISO 17657-1:2005 shall also be referred to in order to calculate the welding current value for the weld time and for an indicated measuring time. 6.6 Display unit and output ports The welding current meter should be built with a display device, either of the pointer type, the digital display type or print-out type, indicating the measured welding current and weld time defined in ISO 17657-1, and show the welding current value for an indi
