EN 50240:2004

SLOVENSKI SIST EN 50240:2005
STANDARD
april 2005
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Electromagnetic compatibility (EMC) – Product standard for resistance welding
equipment
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EUROPEAN STANDARD
EN 50240
NORME EUROPÉENNE
September 2004
EUROPÄISCHE NORM
ICS 25.160.30; 33.100.01
English version
Electromagnetic compatibility (EMC) -
Product standard for resistance welding equipment

Compatibilité électromagnétique (CEM) - Elektromagnetische Verträglichkeit (EMV) -
Norme de produit pour le matériel Produktnorm für Widerstands-
de soudage par résistance Schweißeinrichtungen

This European Standard was approved by CENELEC on 2004-04-01. 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, Cyprus, Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden,
Switzerland and United Kingdom.

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

Central Secretariat: rue de Stassart 35, B - 1050 Brussels

© 2004 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.

Ref. No. EN 50240:2004 E
Foreword
This European Standard was prepared by the Technical Committee CENELEC TC 26B, Electric
resistance welding.
The text of the draft was submitted to the Unique Acceptance Procedure and was approved by
CENELEC as EN 50240 on 2004-04-01.

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 (dop) 2005-04-01

- latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2007-04-01
__________
– 3 – EN 50240:2004
Contents
Page
1 Scope .4
1.1 Emission .4

1.2 Immunity .4

2 Normative references .4

3 Definitions.6

4 Test set-up for emission and immunity.7

4.1 General requirements .7

4.2 Ancillary equipment .8
4.3 Measuring equipment .8
5 High frequency emission tests .8
5.1 Test conditions .8
5.2 Emission limits .8

5.2.1 General .8

5.2.2 Conducted emission limits .8

5.2.3 Radiated emission limits .9

6 Low frequency emission tests.9

7 Immunity tests.9

7.1 Test conditions .11
7.2 Immunity performance criteria.11
7.2.1 Performance criteria A .11
7.2.2 Performance criteria B .11

7.2.3 Performance criteria C .11

7.3 Immunity levels.12

8 Documentation for the purchaser / user .12

Annex A (informative) Immunity levels – A.C. input power port.13

Table 1 - Limits of a.c. input power port disturbance voltage for class A equipment
in the frequency band 150 kHz to 30 MHz.9
Table 2 - Limits of a.c. input power port disturbance voltage for class B equipment
in the frequency band 150 kHz to 30 MHz.9
Table 3 - Immunity levels – Enclosure .10
Table 4 - Immunity levels – A.C. input power port .10
Table 5 - Immunity levels – Ports for process, measurement and control lines .10
Table A.1 – Immunity levels – A.C. input power port .13

1 Scope
This standard is applicable to equipment for resistance welding and allied processes intended
for use in industrial and light industrial environments which are connected to mains supplies
with rated voltages up to 1 000 V a.c. rms. This standard does not define safety requirements.
Resistance welding equipment type tested in accordance with, and which has met the
requirements of this standard, shall be deemed to be in compliance for all applications.
The frequency range covered is from 0 Hz to 400 GHz.
This product EMC standard for resistance welding equipment takes precedence over all
aspects of the generic standards and no additional EMC tests are required or necessary.
NOTE 1  Typical allied processes are resistance hard and soft soldering or resistance heating achieved by means
comparable to resistance welding equipment.
NOTE 2  Limit values are specified for only part of the frequency range.
Resistance welding equipment are classified as class A and class B equipment.
1.1 Emission
The objective of this standard is to specify:
a) test methods to be used in conjunction with EN 55011:1998 and its amendments A1:1999
and A2:2002 to determine electromagnetic emission;
b) relevant standards for harmonic current emission, voltage fluctuations and flicker.
NOTE 1  The limits in this standard may not, however, provide full protection against interference to radio and
television reception when the resistance welding equipment is used closer than 30 m to the receiving antenna(e).
NOTE 2  In special cases, when highly susceptible apparatus is being used in close proximity, additional mitigation
measures may have to be employed to further reduce the electromagnetic emissions.
1.2 Immunity
The objective of this standard is to define immunity requirements and test methods for
continuous and transient, conducted and radiated disturbances including electrostatic
discharges.
NOTE  These levels do not, however, cover extreme cases which are extremely rare.
2 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. (New PNE text)
EN Title IEC/ISO
- International Electrotechnical Vocabulary - IEC 60050-161
Chapter 161: Electromagnetic compatibility
- International Electrotechnical Vocabulary - IEC 60050-851
Chapter 851: Electric welding
- Specification for radio disturbance and immunity CISPR 16-1
measuring apparatus and methods – Part 1: Radio
disturbance and immunity measuring apparatus

– 5 – EN 50240:2004
EN Title IEC/ISO
EN 50063 Safety requirements for the construction and the -
installation of equipment for resistance welding and
allied processes
EN 55011:1998 Industrial, scientific and medical (ISM) radio- CISPR 11:1997 (mod)
A1:1999 frequency equipment – Radio disturbance A1:1999
A2:2002 characteristics – Limits and methods of A2:2002
measurement
EN 55014-1 Electromagnetic compatiblility – Requirements for CISPR 14-1
household appliances, electric tools and similar
apparatus – Part 1: Emission
EN 61000-2-4 Electromagnetic Compatibility (EMC) – IEC 61000-2-4
Part 2-4: Environment - Compatibility levels in
industrial plants for low-frequency conducted
disturbances
EN 61000-3-2 Electromagnetic compatibility (EMC) – IEC 61000-3-2
Part 3-2: Limits – Limits for harmonic current
emissions (equipment input current 16 A per
≤
phase)
EN 61000-3-3 Electromagnetic compatibility (EMC) – IEC 61000-3-3
Part 3-3: Limits – Limitation of voltage changes,
voltage fluctuations and flicker in public low-voltage
supply systems, for equipment with rated current
16 A per phase and not subject to conditional
≤
connection
- Electromagnetic compatibility (EMC) – IEC/TS 61000-3-4
Part 3-4: Limits – Limitation of emission of
harmonic currents in low-voltage power supply
systems for equipment with rated current greater
than 16 A
- Electromagnetic compatibility (EMC) – IEC/TR 61000-3-6
Part 3: Limits – Section 6: Assessment of emission
limits for distorting loads in MV and HV power
systems - Basic EMC publication
- Electromagnetic compatibility (EMC) – IEC/TR 61000-3-7
Part 3: Limits – Section 7: Assessment of emission
limits for fluctuating loads in MV and HV power
systems - Basic EMC publication
EN 61000-3-11 Electromagnetic compatibility (EMC) – IEC 61000-3-11
Part 3-11: Limits – Limitation of voltage changes,
voltage fluctuations and flicker in public low-voltage
supply systems - Equipment with rated current
75 A and subject to conditional connection
≤
EN 61000-4-2 Electromagnetic compatibility (EMC) – IEC 61000-4-2
Part 4-2: Testing and measurement techniques –
Electrostatic discharge immunity test
EN 61000-4-3 Electromagnetic compatibility (EMC) – IEC 61000-4-3
Part 4-3: Testing and measurement techniques –
Radiated, radio-frequency, electromagnetic field
immunity test
EN 61000-4-4 Electromagnetic compatibility (EMC) – IEC 61000-4-4
Part 4-4: Testing and measurement techniques –
Electrical fast transient/burst immunity test

EN Title IEC/ISO
EN 61000-4-5 Electromagnetic compatibility (EMC) – IEC 61000-4-5
Part 4-5: Testing and measurement techniques –
Surge immunity test
EN 61000-4-6 Electromagnetic compatibility (EMC) – IEC 61000-4-6
Part 4-6: Testing and measurement techniques
Immunity to conducted disturbances, induced by
radio-frequency fields
EN 61000-4-7 Electromagnetic compatibility (EMC) – IEC 61000-4-7
Part 4-7: Testing and measurement techniques -
General guide on harmonics and interharmonics
measurements and instrumentation, for power
supply systems and equipment connected thereto
EN 61000-4-11 Electromagnetic compatibility (EMC) – IEC 61000-4-11
Part 4-11: Testing and measurement techniques –
Voltage dips, short interruptions and voltage
variations immunity tests
EN 61000-4-15 Electromagnetic compatibility (EMC) – IEC 61000-4-15
Part 4-15: Testing and measurement techniques –
Flickermeter - Functional and design specifications
- Resistance welding – Resistance welding ISO 669:2000
equipment – Mechanical and electrical
requirements
3 Definitions
Definitions relating to EMC may be found in IEC 60050-161, and in CISPR publications.
The definitions relating to resistance welding equipment may be found in IEC 60050-851,
EN 50063 and ISO 669.
3.1
conventional value
a standardised value that is used as a measure of a parameter for the purposes of comparison,
calibration, testing etc
NOTE  Conventional values do not necessarily apply during the actual welding process.
3.2
conventional load
the load condition with the electrodes short-circuiting as defined in ISO 669:2000
3.3
duty factor (symbol X)
the ratio for a given interval of the on-load duration to the total time
3.4
port
particular interface of the specified apparatus with the external electro-magnetic environment
3.5
enclosure port
the physical boundary of the apparatus through which electro-magnetic fields may radiate or
impinge
– 7 – EN 50240:2004
3.6
cable port
a point at which a conductor or a cable is connected to the apparatus. Examples are signal,
control and power ports
NOTE  The secondary circuit of resistance welding equipment is not a cable port but is part of the enclosure port.
3.7
class A resistance welding equipment
resistance welding equipment suitable for use in all establishments other than domestic and
those directly connected to a public low voltage supply network which supplies buildings used
for domestic purposes
3.8
class B resistance we
...