NEMA EW 9-2012 Arc Welding Power Sources CEnergy Consumption Testing and Labeling.pdf

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1、NEMA Standards PublicationNational Electrical Manufacturers AssociationNEMA EW 9-2012Arc Welding Power SourcesEnergy Consumption Testing and LabelingEW 9-2012 - iii - 2012, NEMA NEMA Standards Publication EW 9-2012 Arc Welding Power SourcesEnergy Consumption Testing and Labeling Published by Nationa

2、l Electrical Manufacturers Association 1300 North 17th Street, Suite 1752 Rosslyn, VA 22209 2012 by National Electrical Manufacturers Association. All rights, including translation into other languages, reserved under the Universal Copyright Convention, the Berne Convention for the Protection of Lit

3、erary and Artistic Works, and the International and Pan American Copyright Conventions. EW 9-2012 - ii - 2012, NEMA CONTENTS 1 Scope 1 2 References . 1 3 Terms and definitions 1 4 Test Conditions 1 5 Measuring Instruments 2 6 Energy consumption units . 2 7 Energy consumption test . 2 7.1 Energy cons

4、umption under normal operating conditions . 2 7.1.1 General test conditions . 2 7.1.2 Supply network-connected welding power sources 3 7.1.3 Engine-driven welding power sources 3 7.2 Standby energy consumption 3 8 Energy consumption information 3 Annex A Suitability of supply network for the measure

5、ment of the true r.m.s. value of the supply current . 4 Annex B (informative) Examples of energy consumption information . 6 EW 9-2012 - iii - 2012, NEMA FOREWORD This is the first edition of this publication and does not replace any other publication. The effective date of this publication is the p

6、ublication date. The initial purpose of this publication is to provide the necessary guidance for manufacturers and importers of arc welding power source equipment to meet in a uniform manner the energy consumption reporting requirements of the Mexican “Law for Sustainable Energy Use” published in t

7、he Official Gazette of Federation, on November 28, 2008, article 23. The content of this publication is therefore based on: a) Official Gazette of the Federation, September 10, 2010, catalog of equipment and appliances for which manufacturers, importers, distributors, and sellers shall include infor

8、mation about their energy consumption. b) Official Gazette of the Federation, March 14, 2011, formats and requirements for the information that shall be submitted by manufacturers and importers of equipments and appliances that use energy for their operation. c) NMX-J-038/1-ANCE-2005, Equipos de Sol

9、dadura Elctrica por Arco Parte 1: Fuentes de Poder para Soldadura. d) IEC 60974-1:2005, Arc welding equipment Part 1: Welding power sources. Although information in this publication was considered technically sound by the consensus of persons engaged in its development and approval, conformity to th

10、is publication does not guarantee compliance with the applicable laws and regulations of Mexico. This publication neither replaces nor supersedes the applicable regulations and laws of Mexico. The user of the publication is responsible to seek and comply with all local and national requirements. Whi

11、le Mexicos law was the initial motivation for this publication, equipment energy consumption and equipment efficiency are becoming increasingly more important topics for consumers and equipment manufacturers worldwide. Ideally, the content of this publication will contribute to a regional or interna

12、tional standard for arc welding equipment energy consumption testing and labeling. Because of this, the structure and drafting of this publication follows the rules established by the International Electrotechnical Commission for its standards. This publication was developed within NEMAs Arc Welding

13、 Section by the Welding Apparatus Technical Committee, which at the time of development consisted of the following member companies: ESAB Welding and Cutting Hypertherm Inc. The Lincoln Electric Company Miller Electric Manufacturing Company Thermadyne Industries, Inc. The Mexican subsidiaries/branch

14、es of these companies are also among the main users of this publication. As such, the following subsidiaries/branches reviewed this publication prior to its approval by the Arc Welding Section: ESAB Mxico, S.A. de C.V. Hypertherm Mxico, S.A. de C.V. ITW Welding Products Group S. de R.L. de C.V. Linc

15、oln Electric Manufactura, S.A. de C.V. Thermadyne de MxicoEW 9-2012 - iv - 2012, NEMA This publication will be reviewed periodically by NEMAs Arc Welding Section, taking into account advancing technology and new applications. Proposed or recommended revisions should be submitted to: Vice President,

16、Technical Services National Electrical Manufacturers Association 1300 North 17th Street, Suite 1752 Rosslyn, Virginia 22209 EW 9-2012 - v - 2012, NEMA NOTICE AND DISCLAIMER The information in this publication was considered technically sound by the consensus of persons engaged in the development and

17、 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. NEMA standards and guideline publications, of which the document contained herein is one, are developed

18、through a voluntary consensus standards development process. This process brings together volunteers and/or seeks out the views of persons who have an interest in the topic covered by this publication. While NEMA administers the process and establishes rules to promote fairness in the development of

19、 consensus, it does not write the document and it does not independently test, evaluate or verify the accuracy or completeness of any information or the soundness of any judgments contained in its standards and guideline publications. NEMA disclaims liability for any personal injury, property or oth

20、er damages of any nature whatsoever, whether special, indirect, consequential or compensatory, directly or indirectly resulting from the publication, use of, application, or reliance on this document. NEMA disclaims and makes no guaranty or warranty, express or implied, as to the accuracy or complet

21、eness of any information published herein, and disclaims and makes no warranty that the information in this document will fulfill any of your particular purposes or needs. NEMA does not undertake to guarantee the performance of any individual manufacturers or sellers products or services by virtue o

22、f this standard or guide. In publishing and making this document available, NEMA is not undertaking to render professional or other services for or on behalf 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

23、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 care in any given circumstances. Information and other standards on the topic covered by this publication may be available from other sources,

24、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 or enforce compliance with the contents of this document. NEMA does not certify, test or inspect products, designs or installations for safety or

25、 health purposes. Any certification or other statement of compliance with any health or safetyrelated information in this document shall not be attributable to NEMA and is solely the responsibility of the certifier or maker of the statement. NEMA EW 9-2012 - 1 - 2012, NEMA 1 Scope This publication d

26、efines test methods and labeling requirements for energy consumption of arc welding power sources. These welding power sources are intended to be either connected to a low-voltage supply network or be driven by a combustion engine. 2 References IEC 60974-1, Arc welding equipment Part 1: Welding powe

27、r sources NMX-J-038/1-ANCE-2005, Equipos de Soldadura Elctrica por Arco Parte 1: Fuentes de Poder para Soldadura 3 Terms and definitions For the purposes of this publication the terms and definitions given in NMX-J-038/1-ANCE-2005 and the following apply. 3.1 Energy consumption Power or other energy

28、 consumed by a welding power source for a period of one hour at the conventional welding current and corresponding conventional load voltage at the maximum duty cycle rating of the welding power source 3.2 Standby energy consumption Power or other energy consumed by a welding power source for a peri

29、od of one hour under no-load conditions for supply network-connected welding power sources that are not provided with: a) a supply circuit on/off switching device that removes all power from ungrounded conductors, or b) instructions for a permanent connection to a disconnect device. NOTE By design,

30、most power sources for manual welding systems do not have any standby energy consumption. 4 Test Conditions The tests shall be carried out on new, dry and completely assembled welding power sources at an ambient air temperature between 10 C and 40 C. Liquid-cooled welding power sources shall be test

31、ed with liquid conditions as specified by the manufacturer. Engine driven welding power sources shall be tested with fuel conditions as specified by the manufacturer. The supply voltage of supply-network-connected welding power sources shall be measured at the point of coupling of the welding power

32、source to the supply network. The test load shall be a practically non-inductive constant resistive load having a power factor not less than 0.99. The load voltage shall be measured at the welding power source welding circuit connections. For welding power sources that are provided with electrode an

33、d work leads, the load voltage shall be measured at the point of connection of the electrode and work leads internal to the welding power source. NOTE The measurement can be affected by the impedance of the supply network (see Annex A). EW 9-2012 - 2 - 2012, NEMA 5 Measuring Instruments A power mete

34、r shall be used to measure the energy consumption of supply network-connected welding power sources. The accuracy of electrical measuring instruments shall be 1 % of full-scale reading or better. 6 Energy consumption units The energy consumption units for supply network-connected welding power sourc

35、es shall be kWh/h. The energy consumption units for engine driven welding power sources shall be g/h or l/h, as appropriate. NOTE The utilization of welding power sources varies greatly depending on the application. Welding can be sporadic and infrequent, or regular and frequent. In many application

36、s, welding is performed for fractions of an hour per day. The use of the unit kWh/h and l/h enables the user to determine realistic energy consumption per unit of time based on frequency of use. For example, if the energy consumption units are Y kWh/h and the user will be welding Z hours per year at

37、 100% output, then the annual energy consumption is Y kWh/h multiplied by Z h/year. 7 Energy consumption test 7.1 Energy consumption under normal operating conditions 7.1.1 General test conditions The welding power source shall be tested at the conventional welding current and the corresponding conv

38、entional load voltage at the 100% duty cycle rating of the welding power source. For power sources that are not rated at a 100% duty cycle, the welding power source shall be operated at the maximum rated duty cycle. To account for the idle or no-load states, the power consumption shall be measured d

39、uring the load period at the rated welding current and the corresponding conventional load voltage, and during the idle period. The duty cycle shall be used to average the power consumption values into an overall energy consumption value. EXAMPLE For a power source rated at 40% duty cycle (40% on ti

40、me, 60% idle time) consuming 10 kW under load and 0.1 kW at idle, the overall energy consumption is calculated as follows: (10 kW x 0.4) + (0.1 kW x 0.6) / (0.4 + 0.6) = 4.06 kW When the power source is operated for one hour under these conditions, the energy consumed is 4.06 kWh. A multi-process we

41、lding power source shall be operated in the output process mode resulting in the maximum output power. Auxiliary power outputs and power supplies to external devices shall not be loaded. Energy or fuel consumption shall be measured after the welding power source is operated for a period of time suff

42、icient to achieve thermal equilibrium. NEMA EW 9-2012 - 3 - 2012, NEMA 7.1.2 Supply network-connected welding power sources A welding power source that operates at multiple supply voltages shall be operated at the rated supply voltage resulting in the maximum energy consumption. The energy consumpti

43、on under normal operating conditions shall be recorded in kWh/h. NOTE The measurement can be affected by the impedance of the supply circuit (see Annex A). 7.1.3 Engine-driven welding power sources A welding power source shall be tested using an external fuel source having a predetermined mass or vo

44、lume of fuel. The mass or volume of fuel consumed shall be recorded as the energy consumption under normal operating conditions in g/h or l/h, as appropriate. 7.2 Standby energy consumption A supply network-connected welding power source that operates at multiple supply voltages shall be operated at

45、 the rated supply voltage resulting in the maximum standby energy consumption. A supply network-connected welding power source shall be operated with no load on the output for a period of time sufficient to achieve thermal equilibrium. The standby energy consumption shall be recorded in Wh/h. This t

46、est is not required for: a) supply network-connected welding power sources provided with a supply circuit on/off switching device that removes all power from ungrounded conductors; b) supply network-connected welding power sources provided with instructions for a permanent connection to a disconnect

47、 device; c) engine-driven welding power sources. 8 Energy consumption information A rating plate, marking, label or hang tag conveying energy consumption information to the customer shall be attached to each welding power source, or where permitted by local or national requirements, to its packaging

48、. For equipment with multiple supply voltages, the manufacturer shall report the energy consumption at the rated supply voltage that resulted in maximum energy consumption. In addition, the manufacturer may report the energy consumption for other rated supply voltages. Markings and labels shall be c

49、lear and legible when received by the customer. Indelibility is not required. NOTE Annex B provides examples of energy consumption information attached to a welding power source. (informative). EW 9-2012 - 4 - 2012, NEMA Annex A Suitability of supply network for the measurement of the true r.m.s. value o