En 60974-4 2007 - Arc Welding Equipment
En 60974-4 2007 - Arc Welding Equipment
En 60974-4 2007 - Arc Welding Equipment
Bought by Mr Antonio Lima,A Jorge LIma Lda (Portugal),on 07/12/2010 15:14 Latest version. Not to be distributed/networked. For multi-user access www.bsigroup.com/license BSI
BS EN 60974-4:2007
ICS 25.160
BS EN 60974-4:2007
Bought by Mr Antonio Lima,A Jorge LIma Lda (Portugal),on 07/12/2010 15:14 Latest version. Not to be distributed/networked. For multi-user access www.bsigroup.com/license BSI
National foreword
This British Standard was published by BSI. It is the UK implementation of EN 60974-4:2007. It is identical with IEC 60974-4:2006. The UK participation in its preparation was entrusted to Technical Committee WEE/6, Electric arc welding equipment. A list of organizations represented on WEE/6 can be obtained on request to its secretary. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard cannot confer immunity from legal obligations.
This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 March 2007
BSI 2007
Bought by Mr Antonio Lima,A Jorge LIma Lda (Portugal),on 07/12/2010 15:14 Latest version. Not to be distributed/networked. For multi-user access www.bsigroup.com/license BSI
EN 60974-4
February 2007
English version
Arc welding equipment Part 4: In-service inspection and testing (IEC 60974-4:2006)
Matriel de soudage l'arc Partie 4: Inspection et essai en service (CEI 60974-4:2006) Lichtbogenschweieinrichtungen Teil 4: Instandhaltung und Prfung (IEC 60974-4:2006)
This European Standard was approved by CENELEC on 2006-12-01. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. 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 translation 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, Bulgaria, Cyprus, the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom.
CENELEC
European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B - 1050 Brussels
2007 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 60974-4:2007 E
EN 60974-4:2007
Bought by Mr Antonio Lima,A Jorge LIma Lda (Portugal),on 07/12/2010 15:14 Latest version. Not to be distributed/networked. For multi-user access www.bsigroup.com/license BSI
Foreword
The text of document 26/340/FDIS, future edition 1 of IEC 60974-4, prepared by IEC TC 26, Electric welding, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 60974-4 on 2006-12-01. This standard is to be used in conjunction with EN 60974-1. The following dates were fixed: latest date by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement latest date by which the national standards conflicting with the EN have to be withdrawn
(dop) (dow)
2007-09-01 2009-12-01
This European Standard covers the essential requirements given in Article 4 of Council Directive 89/655/EEC concerning the minimum safety and health requirements for the use of work equipment by workers at work, as amended by Directive 95/63/EC. Annex ZA has been added by CENELEC. __________
Endorsement notice
The text of the International Standard IEC 60974-4:2006 was approved by CENELEC as a European Standard without any modification. __________
EN 60974-4:2007
Bought by Mr Antonio Lima,A Jorge LIma Lda (Portugal),on 07/12/2010 15:14 Latest version. Not to be distributed/networked. For multi-user access www.bsigroup.com/license BSI
CONTENTS
1 2 3 4 Scope ............................................................................................................................4 Normative references .....................................................................................................4 Terms and definitions .....................................................................................................4 General requirements .....................................................................................................5 4.1 Qualification of test personnel ................................................................................5 4.2 Test conditions ......................................................................................................5 4.3 Measuring instruments...........................................................................................5 4.4 Periodic inspection and test ...................................................................................5 4.5 Maintenance..........................................................................................................5 4.6 Repair ...................................................................................................................5 4.7 Test sequence .......................................................................................................5 Protection against electrical shock ..................................................................................6 5.1 Visual inspection ...................................................................................................6 5.2 Continuity of the protective circuit ..........................................................................6 5.3 Insulation resistance ..............................................................................................7 5.4 Welding circuit leakage current ..............................................................................7 5.5 Primary leakage current .........................................................................................8 5.6 No-load voltage ( U 0 ) ..............................................................................................9 Functional test..............................................................................................................10 6.1 Function ..............................................................................................................10 6.2 Supply-circuit on/off switching device ...................................................................10 6.3 Voltage-reducing device ......................................................................................10 6.4 Magnetic gas valve ..............................................................................................11 6.5 Signal and control lamps......................................................................................11 Documentation .............................................................................................................11 7.1 7.2 Test report ..........................................................................................................11 Labelling .............................................................................................................11
Annex A (informative) Check-list for the visual inspection ...................................................12 Annex B (informative) Example of a test report after repair .................................................13 Annex C (informative) Equipment not built in accordance with IEC 60974-1 ........................14 Annex ZA (normative) Normative references to international publications with their corresponding European publications............................................................................15 Figure 1 Measurement of leakage current of welding circuit ................................................7 Figure 2 Measuring network for primary leakage current .....................................................8 Figure 3 Principles of primary leakage current measurement for single phase equipment ...9 Figure 4 Measurement of peak values ..............................................................................10 Table 1 Test sequence on used arc welding equipment.......................................................6 Table 2 Insulation resistance..............................................................................................7
EN 60974-4:2007
Bought by Mr Antonio Lima,A Jorge LIma Lda (Portugal),on 07/12/2010 15:14 Latest version. Not to be distributed/networked. For multi-user access www.bsigroup.com/license BSI
Scope
This part of IEC 60974 specifies test procedures for in-service inspection and, after repair, to ensure electrical safety. These test procedures are also applicable for maintenance. This standard is applicable to power sources together with ancillary equipment for arc welding, cutting and allied processes built in conformity with IEC 60974-1. This standard is not applicable to testing of new power sources or engine-driven power sources.
NOTE For a power source not built in accordance with IEC 60974-1, see Annex C .
Normative references
The following referenced documents are indispensable for the application 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. IEC 60050-151, International Electrotechnical Vocabulary (IEV) Part 151: Electrical and magnetic devices IEC 60050-195, International Electrotechnical Vocabulary (IEV) Part 195: Earthing and protection against electric shock IEC 60050-851, International Electrotechnical Vocabulary (IEV) Chapter 851: Electric welding IEC 60974-1, Arc welding equipment Part 1: Welding power sources IEC 61557-4, Electrical safety in low voltage distribution systems up to 1000 V a.c. and 1500 V d.c. Equipment for testing, measuring or monitoring of protective measures Part 4: Resistance of earth connection and equipotential bonding
For the purposes of this document, the terms and definitions given in IEC 60050-151, IEC 60050-195, IEC 60050-851, IEC 60974-1, as well as the following, apply. 3.1 periodic inspection and test examination carried out at specified intervals to reduce the risk of hazard 3.2 maintenance service carried out at specified intervals to reduce the risk of hazard and failure
EN 60974-4:2007
Bought by Mr Antonio Lima,A Jorge LIma Lda (Portugal),on 07/12/2010 15:14 Latest version. Not to be distributed/networked. For multi-user access www.bsigroup.com/license BSI
4
4.1
General requirements
Qualification of test personnel
Tests of welding power sources can be hazardous and shall be carried out by an expert in the field of electrical repair, preferably also familiar with welding, cutting and allied processes. 4.2 Test conditions
Tests shall be carried out at an ambient air temperature between 10 C and 40 C on a dry and cleaned welding power source. 4.3 Measuring instruments
The accuracy of measuring instruments shall be class 2.5 as a minimum, except for the measurement of insulation resistance, where the accuracy of the instruments is not specified but shall be taken into account for the measurement. 4.4 Periodic inspection and test
The periodic inspection and test specified in Table 1 shall be carried out. Tests shall be documented in a test report in accordance with 7.1. 4.5 Maintenance
The manufacturers maintenance schedule and instructions shall be followed. Tests shall be documented in a test report in accordance with 7.1. 4.6 Repair
After repair or replacement of a component which restores a welding or cutting function, an expert shall select appropriate tests to be carried out, as specified in Table 1.
NOTE After a minor repair such as replacement of a lamp, wheel or under carriage, the tests given in Table 1 may not be necessary.
Tests shall be documented in a test report in accordance with 7.1. During the tests, complementary instructions from manufacturer included in repair manual shall be observed (for example, circuit diagrams, functional test, etc.). 4.7 Test sequence
EN 60974-4:2007
Bought by Mr Antonio Lima,A Jorge LIma Lda (Portugal),on 07/12/2010 15:14 Latest version. Not to be distributed/networked. For multi-user access www.bsigroup.com/license BSI
The insulation resistance test can be replaced by the primary and welding circuit leakage current tests in accordance with 5.4 and 5.5 .
5
5.1
Visual inspection shall be carried out in accordance with the conditions of use of welding equipment and the manufacturers instructions. An example of items for a visual inspection is given in Annex A. 5.2 Continuity of the protective circuit
For mains-powered welding equipment of protection class I, including ancillary equipment (for example, cooling system) having mains connecting cables up to a length of 5,0 m, the maximum measured protective conductor resistance shall not exceed 0,3 . For cables longer than 5,0 m, the permissible value of the protective conductor resistance is increased by 0,1 per additional 7,5 m cable. The maximum permissible value of the protective conductor resistance is 1 . Conformity shall be checked by measuring the resistance between the protective conductor contact at the plug and exposed conductive parts with testing equipment according to IEC 61557-4. During the measurement, the cables shall be bent, flexed or twisted along the whole length, especially in the vicinity of cable entries into the enclosure, in order to detect interruptions in the protective conductor.
EN 60974-4:2007
Bought by Mr Antonio Lima,A Jorge LIma Lda (Portugal),on 07/12/2010 15:14 Latest version. Not to be distributed/networked. For multi-user access www.bsigroup.com/license BSI
5.3
Insulation resistance
The insulation resistance shall be not less than the values given in Table 2. Table 2 Insulation resistance
Supply circuit Welding circuit Supply circuit to to to welding circuit protective circuit protective circuit 5,0 M 2,5 M 2,5 M
Torches shall be disconnected during the measurement. Welding power source including a liquid cooling unit shall be tested without liquid. Conformity shall be checked by the stabilized measurement of the insulation resistance by application of a d.c. voltage of 500 V at room temperature. 5.4 Welding circuit leakage current
The leakage current between the welding outlets and the protective conductor terminal shall not exceed 10 mA a.c. r.m.s. Conformity shall be checked by measurement of the leakage current with a circuit as shown in Figure 1 at the rated supply voltage and no-load condition. The measuring circuit shall have a total resistance of 1 750 250 and be shunted by a capacitor so that the time constant of the circuit will be 225 s 15 s. In the case of 1 750 , the capacitor will be 130 nF.
130 nF
mA 1 750
IEC 1904/06
EN 60974-4:2007
Bought by Mr Antonio Lima,A Jorge LIma Lda (Portugal),on 07/12/2010 15:14 Latest version. Not to be distributed/networked. For multi-user access www.bsigroup.com/license BSI
5.5
The primary leakage current in the external protective conductor shall not exceed a) 5 mA for plug-connected equipment rated up to and including 32 A;
b) 10 mA for plug-connected equipment rated more than 32 A; c) 10 mA for equipment for permanent connection, without special measures for the protective conductor; d) 5 % of the rated input current per phase, for equipment for permanent connection with a reinforced protective conductor. Conformity shall be checked using the measuring circuit shown in Figure 2 under the following conditions: a) the welding power source is isolated from the ground plane; supplied by the rated supply voltage; not connected to the protective earth except through measurement components;
b) the output circuit is in the no-load condition; c) interference suppression capacitors shall not be disconnected.
NOTE The circuit given in Figure 2 is used to obtain reproducible results. The use of a conventional ammeter is not recommended because the value will be incorrect.
RS
CS R1
B RB U1 C1 U2
IEC 1905/06
Key A, B RS RB Test terminals 1 500 500 Leakage current CS R1 C1 0,22 F 10 000 0,022 F
I PE =
U2 RB
Figure 2 Measuring network for primary leakage current The measurement of the primary leakage current may be made direct or in the form of a difference current measurement (see Figure 3). Instead of the ammeter shown in Figure 3, the measuring circuit in Figure 2 shall be used. Equipment for permanent connection with a reinforced protective conductor shall be tested according to the manufacturers specification.
EN 60974-4:2007
Bought by Mr Antonio Lima,A Jorge LIma Lda (Portugal),on 07/12/2010 15:14 Latest version. Not to be distributed/networked. For multi-user access www.bsigroup.com/license BSI
PE
N/L
L Measuring instrument
PE
N/L
Measuring instrument
A A B
Power source
IEC 1906/06
Power source
IEC 1907/06
Figure 3 Principles of primary leakage current measurement for single phase equipment
NOTE Caution! A qualified person should perform this test. The protective conductor is disabled for this test.
5.6
No-load voltage ( U 0 )
The peak values of the maximum no-load voltage at all possible settings shall not exceed the values given in the rating plate when the power source is supplied at rated supply voltage and frequency. Before testing, arc striking and stabilizing devices shall, if necessary, be removed or bypassed according to the manufacturers instructions (see also instructions for use or manufacturers testing instructions). The no-load voltage is measured between welding output terminals. If this is not possible for safety or control reasons (for example, with welding power sources for plasma cutting), the no-load voltage is measured between torch and welding return cable connection. If U R or U S are defined on the rating plate, U R or U S shall be measured instead of U 0 . Conformity shall be checked by measurement of a) r.m.s. values A true r.m.s. meter is used with a resistance of the external welding circuit of 5 k with a maximum tolerance of 5 %. b) peak values To obtain reproducible measurements of peak values, omitting impulses which are not dangerous, a circuit is used as shown in Figure 3 and Figure 4.
EN 60974-4:2007
10
Bought by Mr Antonio Lima,A Jorge LIma Lda (Portugal),on 07/12/2010 15:14 Latest version. Not to be distributed/networked. For multi-user access www.bsigroup.com/license BSI
1 k
IEC 1908/06
Figure 4 Measurement of peak values The voltmeter shall indicate mean values. The measurement range chosen shall be as near as possible to the actual value of the no-load voltage. The voltmeter shall have an internal resistance of at least 1 M . The tolerance of the component values in the measurement circuit shall not exceed 5 %. The minimum power for the resistor of 0,2 k is 65 W. The rheostat shall withstand a current value of 0,6 A. The capacitor shall have a minimum voltage rating of 200 V.
6
6.1
Functional test
Function
Each safety-related function judged as relevant by the test personnel shall be checked for correct operation. Conformity shall be checked by operating the device and by checking whether the welding power source operates correctly. 6.2 Supply-circuit on/off switching device
Where an integral supply-circuit on/off switching device (for example, switch, contactor or circuit-breaker) is fitted, this shall a) open or close all ungrounded mains conductors; b) clearly indicate whether the circuit is open or closed. Conformity shall be checked by visual inspection and measurement. 6.3 Voltage-reducing device
Where a voltage-reducing device is fitted, this shall a) reduce the rated no-load voltage when the resistance of the external welding circuit exceeds 200 ; b) indicate satisfactory operation. Conformity shall be checked by connecting a variable load resistor across the welding output connections of the welding power source. Voltage value shall be measured in accordance with 5.6.
11
EN 60974-4:2007
Bought by Mr Antonio Lima,A Jorge LIma Lda (Portugal),on 07/12/2010 15:14 Latest version. Not to be distributed/networked. For multi-user access www.bsigroup.com/license BSI
6.4
Each magnetic gas valve (for example, TIG, MIG/MAG, PLASMA power sources), shall be checked for correct operation. Conformity shall be checked by visual inspection and the following operations or by a test specified by the manufacturer. a) Function Operate the trigger of the torch and check by means of the gas flow whether the magnetic gas valve operates. b) Leakage Pressurize the system and verify there is no leak, for example, there is no pressure drop.
NOTE Attention should be paid to the fact that also flexible gas tubes and their connections may leak.
6.5
Each signal or control lamp fitted shall be checked for correct operation. Conformity shall be checked by visual inspection.
7
7.1
Documentation
Test report
The test report shall include a) identification of tested arc welding equipment; b) date of testing; c) test results; d) signature, identification of the technician and his organization; e) identification of test equipment. The test report, after repair, shall include all the tests given in Table 1 and an indication shall be made if a particular test has not been carried out. An example of a test report is given in Annex B. 7.2 Labelling
A label shall be attached to the equipment to indicate that it has passed the test. The label shall state the date of testing.
EN 60974-4:2007
12
Bought by Mr Antonio Lima,A Jorge LIma Lda (Portugal),on 07/12/2010 15:14 Latest version. Not to be distributed/networked. For multi-user access www.bsigroup.com/license BSI
13
EN 60974-4:2007
Bought by Mr Antonio Lima,A Jorge LIma Lda (Portugal),on 07/12/2010 15:14 Latest version. Not to be distributed/networked. For multi-user access www.bsigroup.com/license BSI
- Input circuit/ Welding circuit (1000 V) Primary leakage current - Plug-connected equipment rated up to 32 A (500 V) - Plug-connected equipment rated more than 32 A (500 V) - Permanent connection without special measures (500 V)
I PE
[mA]
5 mA
I PE
[mA]
10 mA
I PE
[mA]
10 mA
- Equipment with reinforced protective conductor I PE (500 V) Welding circuit leakage current I PE No-load voltage U0 U0 Functional test Test passed Investigator name Investigator signature
[mA]
5% --0,568
[mA] [V AC ] [V DC ]
10 mA -- V peak -------
113 V peak
Remarks (result of visual inspection or functional test): None __________________________ Testing company: Checkmates Limited ____________________________________________ Address: London Weldshire WG3 A7 _____________________________________________ Repair: replacement of broken main switch ________________________________________
N/A: Not applicable to the repair according to the investigator
EN 60974-4:2007
14
Bought by Mr Antonio Lima,A Jorge LIma Lda (Portugal),on 07/12/2010 15:14 Latest version. Not to be distributed/networked. For multi-user access www.bsigroup.com/license BSI
Welding equipment not built in accordance with IEC 60974-1 (for example, built prior to the publication date of edition 1) may not meet all requirements of this standard. In this case, the investigator should state in his report as follows: the requirements which have not been met; the extend to which the requirement has not been met; the assessment of the risk deriving there of; the corrective measures when necessary.
The report should enable the owner to take the right decision. In some cases the equipment will need to be taken out of service.
___________
15
EN 60974-4:2007
Bought by Mr Antonio Lima,A Jorge LIma Lda (Portugal),on 07/12/2010 15:14 Latest version. Not to be distributed/networked. For multi-user access www.bsigroup.com/license BSI
Annex ZA (normative) Normative references to international publications with their corresponding European publications
The following referenced documents are indispensable for the application 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.
NOTE When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD applies.
Year 1)
Title International Electrotechnical Vocabulary (IEV) Part 151: Electrical and magnetic devices International Electrotechnical Vocabulary (IEV) Chapter 195: Earthing and protection against electric shock
EN/HD -
Year -
IEC 60050-195
-1)
IEC 60050-851
-1)
International electrotechnical vocabulary (IEV) Chapter 851: Electric welding Arc welding equipment Part 1: Welding power sources Electrical safety in low voltage distribution systems up to 1 000 V a.c. and 1 500 V d.c. Equipment for testing, measuring or monitoring of protective measures Part 4: Resistance of earth connection and equipotential bonding EN 60974-1 -
-1) -1)
2005 2) -
1) 2)
BS EN 60974-4:2007
Bought by Mr Antonio Lima,A Jorge LIma Lda (Portugal),on 07/12/2010 15:14 Latest version. Not to be distributed/networked. For multi-user access www.bsigroup.com/license BSI