IEC 61587-2:2011

Mechanical structures for electronic equipment - Tests for IEC 60917 and 60297 - Part 2: Seismic tests for cabinets and racks

IEC 61587-2:2011 specifies seismic tests for cabinets and racks accommodated with IEC 60917 and 60297 series. It applies, in whole or in part, only to the mechanical structures of cabinets and racks for electronic equipment according to the above cited series of standards, while it does not apply to the electronic equipment or systems deemed to be installed within these mechanical structures. This standard does not apply either to a cabinet or a rack having an anti-seismic isolation structure, either external or internal. This standard aims to provide test conditions and criteria that constitute a reference to evaluate the ability of the mechanical structure of the cabinets or racks to acceptably withstand specified seismic intensities. For this purpose, this standard specifies test specimen conditions, such as dimensions (i.e. height, width and depth) of the cabinet and the rack, load distribution, structural test condition and the RRS (required response spectra) of single-axis or tri-axis acceleration as the seismic test wave condition. The single-axis or tri-axis acceleration is selectable. The second edition of this standard replaces the first edition published in 2000 and constitutes a technical revision. The main technical changes with regard to the previous edition are as follows:
Edition 1.0 specified the test condition with one size of the cabinet, and one load distribution. The specified acceleration condition for the test specimen was single-axis and one of the RRS (required response spectra) specified in the standard was selected. The test was aimed to obtain the reference for the structural strength of the enclosure against the specified seismic intensity. Earthquakes are actually random phenomena that are much more carefully simulated by tri-axial simultaneous operation. The demand of tri-axial excitation has emerged as a more accurate representation of an earthquake.

Structures mécaniques pour équipements électroniques - Essais pour la CEI 60917 et la CEI 60297 - Partie 2: Essais sismiques pour baies et bâtis

La CEI 61587-2:2011 spécifie les essais sismiques pour les baies et les bâtis des séries CEI 60917 et 60297. Elle s'applique, totalement ou partiellement, seulement aux structures mécaniques des baies et des bâtis pour les équipements électroniques conformes aux séries de normes précitées, mais elle ne s'applique pas aux équipements ou systèmes électroniques destinés à être installés à l'intérieur de ces structures mécaniques. La présente norme ne s'applique pas non plus à une baie ou un bâti équipé d'une structure d'isolation anti-sismique, qu'elle soit externe ou interne. La présente norme est destinée à fournir des conditions et des critères d'essai qui constituent une référence pour évaluer l'aptitude de la structure mécanique des baies ou des bâtis à résister de manière acceptable à des intensités sismiques spécifiées. Dans ce but, la présente norme spécifie des conditions pour le spécimen en essai, comme les dimensions (c'est-à-dire hauteur, largeur et profondeur) de la baie et du bâti, la répartition de charge, la condition de l'essai structurel et le SRS (spectre de réponse spécifié) de l'accélération à axe unique ou sur les trois axes comme condition d'onde d'essai sismique. Il est possible de choisir entre accélération à axe unique ou sur les trois axes. Cette deuxième édition annule et remplace la première édition parue en 2000, dont elle constitue une révision technique. Les principaux changements techniques par rapport à l'édition précédente sont les suivants:
L'édition 1.0 spécifiait la condition d'essai avec une taille de baie et une répartition des charges. La condition d'accélération spécifiée pour le spécimen soumis à l'essai était monoaxiale et un des SRS (spectre de réponse spécifié) spécifiés dans la norme était choisi. L'essai était destiné à obtenir la référence pour la résistance structurelle de l'enveloppe par rapport à l'intensité sismique spécifiée. Les tremblements de terre sont réellement des phénomènes aléatoires qui sont bien mieux simulés par un fonctionnement sur les trois axes simultané. Le besoin d'une excitation sur les trois axes a émergé pour une évaluation plus approfondie des tremblements de terre.

General Information

• Status: Published
• Publication Date: 24-Aug-2011
• ICS: 31.240 - Mechanical structures for electronic equipment
• Technical Committee: SC 48D - Mechanical structures for electrical and electronic equipment
• Drafting Committee: WG 2 - TC 48/SC 48D/WG 2
• Current Stage: PPUB - Publication issued
• Start Date: 25-Aug-2011
• Completion Date: 15-Sep-2011

Relations

• Revises: IEC 61587-2:2000 - Mechanical structures for electronic equipment - Tests for IEC 60917 and IEC 60297 - Part 2: Seismic tests for cabinets and racks
• Effective Date: 05-Sep-2023

Standards Content (Sample)

IEC 61587-2 ®
Edition 2.0 2011-08
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Mechanical structures for electronic equipment – Tests for IEC 60917 and
IEC 60297 –
Part 2: Seismic tests for cabinets and racks

Structures mécaniques pour équipements électroniques – Essais pour la
CEI 60917 et la CEI 60297 –
Partie 2: Essais sismiques pour baies et bâtis

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IEC 61587-2 ®
Edition 2.0 2011-08
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Mechanical structures for electronic equipment – Tests for IEC 60917 and
IEC 60297 –
Part 2: Seismic tests for cabinets and racks

Structures mécaniques pour équipements électroniques – Essais pour la
CEI 60917 et la CEI 60297 –
Partie 2: Essais sismiques pour baies et bâtis

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX N
ICS 31.240 ISBN 978-2-88912-624-8

– 2 – 61587-2 © IEC:2011
CONTENTS
FOREWORD . 3
INTRODUCTION . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 6
4 Set up of test specimen and measurement items . 7
4.1 Introductory remarks . 7
4.2 General . 7
4.3 Set up of the cabinets or racks to the vibration table . 8
4.4 Measurement items . 8
5 Test waveform and acceleration condition . 9
5.1 Introductory remarks . 9
5.2 General . 9
5.3 Single-axis acceleration . 9
5.4 Triaxial acceleration . 10
6 Assessment following the test. 13
Annex A (informative) Vibration generators and information . 14

Figure 1 – Cabinets or racks configuration for test set up . 7
Figure 2 – Block diagram of test set up configuration . 8
Figure 3 – The RRS for test wave (damping ratio 2 %) . 10
Figure 4 – Time-history of the test wave . 10
Figure 5 – The RRS for test wave (damping ratio 3 %) . 11
Figure 6 – Time-history of test wave for each axis . 12

Table 1 – Load distribution within the cabinet . 8

61587-2 © IEC:2011 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
MECHANICAL STRUCTURES FOR ELECTRONIC EQUIPMENT –
TESTS FOR IEC 60917 AND IEC 60297 –

Part 2: Seismic tests for cabinets and racks

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
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indispensable for the correct application of this publication.
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patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 61587-2 has been prepared by subcommittee 48D: Mechanical
structures for electronic equipment, of IEC technical committee 48: Electromechanical
components and mechanical structures for electronic equipment.
The second edition of this standard replaces the first edition issued in 2000 and constitutes a
technical revision.
The main technical changes with regard to the previous edition are as follows:
Edition 1.0 specified the test condition with one size of the cabinet, and one load distribution.
The specified acceleration condition for the test specimen was single-axis and one of the RRS
(required response spectra) specified in the standard was selected. The test was aimed to
obtain the reference for the structural strength of the enclosure against the specified seismic
intensity. Earthquakes are actually random phenomena that are much more carefully
simulated by tri-axial simultaneous operation. The demand of tri-axial excitation has emerged
as a more accurate representation of an earthquake.

– 4 – 61587-2 © IEC:2011
The text of this standard is based on the following documents:
FDIS Report on voting
48D/471/FDIS 48D/486/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all parts of IEC 61587 series, under the general title: Mechanical structures for
electronic equipment – Tests for IEC 60917 and IEC 60297, can be found on the IEC website.
The committee has decided that the contents of this publication will remain unchanged until
the stability date indicated on the IEC web site under "http://webstore.iec.ch" in the data
related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
61587-2 © IEC:2011 – 5 –
INTRODUCTION
Edition 1.0 of this standard specified the seismic test for the cabinets or racks according to
IEC 60297 and IEC 60917. The specified test applied to the structure of the enclosure and did
not apply to the whole system.
Edition 1.0 specified the test condition with one size of the cabinet, and one load distribution.
The specified acceleration condition for the test specimen was single-axis and one of the RRS
(required response spectra) specified in the standard was selected. The test was aimed to
obtain the reference for the structural strength of the enclosure against the specified seismic
intensity.
The electronic system consists of two or more subracks. Two or more plug-in units that
perform signal processing are installed in each subrack. The size, i.e.: height, width and
depth, and the weight of each subrack may vary for each electronic system. So, various types
of cabinets or racks to equip the electronic system are currently demanded. Therefore, many
types of cabinets or racks are required to install the equipment.
Earthquakes are actually random phenomena that are much more carefully simulated by tri-
axial simultaneous operation. The demand of tri-axial excitation has emerged as a more
accurate representation of an earthquake.
Edition 2.0 of this standard has been reviewed in consideration of these demanded
conditions. However, it is impossible to perform the seismic test under all of the cabinet or
rack conditions. The aim of this standard is then to evaluate the reference of the cabinet or
rack structure with a common examination method. The seismic test is therefore assumed to
be performed on one set of cabinet dimensional conditions (i.e. height, width and depth) and
one set of load distribution conditions in the cabinet. The input acceleration for the test
specimen is assumed to be selected and applied either single-axial or tri-axial. Single-axis
acceleration was already specified in Edition 1.0 of this standard. Therefore, the RRS
(required response spectra) for tri-axial acceleration have been added. According to this
standard, the examination should be performed in the same manner, so as to obtain a
reference for the evaluation of the structural strength of the tested cabinet or rack.
The user who requests an individual structural cabinet or rack condition, such as a different
cabinet size or a different load distribution in the cabinet, and requests different seismic
acceleration intensity, can perform the test by changing the corresponding condition specified
in this standard. In this case, the test result is treated as an individual evaluation, not to be
taken as a reference.
– 6 – 61587-2 © IEC:2011
MECHANICAL STRUCTURES FOR ELECTRONIC EQUIPMENT –
TESTS FOR IEC 60917 AND IEC 60297 –

Part 2: Seismic tests for cabinets and racks

1 Scope
This part of IEC 61587 specifies seismic tests for cabinets and racks accommodated with
IEC 60917 and 60297 series. It applies, in whole or in part, only to the mechanical structures
of cabinets and racks for electronic equipment according to the above cited series of
standards, while it does not apply to the electronic equipment or systems deemed to be
installed within these mechanical structures. This standard does not apply either to a cabinet
or a rack having an anti-seismic isolation structure, either external or internal.
This standard aims to provide test conditions and criteria that constitute a reference to
evaluate the ability of the mechanical structure of the cabinets or racks to acceptably
withstand specified seismic intensities. For this purpose, this standard specifies test specimen
conditions, such as dimensions (i.e. height, width and depth) of the cabinet and the rack,
load distribution, structural test condition and the RRS (required response spectra) of single-
axis or tri-axis acceleration as the seismic test wave condition. The single-axis or tri-axis
acceleration is selectable.
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.
IEC 60068-2-6: Environmental testing – Part 2-6: Tests – Test Fc: Vibration (sinusoidal)
IEC 60068-2-47: Environmental testing – Part 2-47: Tests – Mounting of specimens for
vibration, impact and similar dynamic tests
IEC 60068-2-57: Environmental testing – Part 2-57: Tests – Test Ff: Vibration – Time-history
method
IEC 60068-3-3: Environmental testing – Part 3: Guidance – Seismic test methods for
equipments
IEC 60297 (all parts): Mechanical structures for electronic equipment – Dimensions of
mechanical structures of the 482,6 mm (19 in) series
IEC 60917, (all parts): Modular order for the development of mechanical structures for
electronic equipment practices
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 60068-2-6,
IEC 60068-3-3, IEC 60068-2-47 and IEC 60068-2-57 apply.

61587-2 © IEC:2011 – 7 –
4 Set up of test specimen and measurement items
4.1 Introductory remarks
The seismic test of the cabinets or the racks shall be performed under loaded condition.
4.2 General
The cabinets or racks under the test shall be loaded in a distributed manner throughout the
height of the cabinets or racks with dummy plug-in units similar to a practical subrack
application.
The cabinets or racks to be tested shall be loaded as shown in Figure 1 and Table 1. This is
the condition to be taken as reference.
Cabinets or racks equipped with front/rear doors, and/or side panels may gain structural
contribution from their installation. The test report shall state whether the tested cabinets or
racks were tested with or without doors and panels. Cabinets or racks to be deployed in the
field by the user without doors and/or side panels will require cabinets or racks to be tested
without doors and/or side panels.

Dummy load M3
Dummy load M5
5 x A
D = 600 max.
To be attached to the front
and rear verticals
D
A
2 000
Dummy load M4
To be attached to the
bottom
Z
Y
IEC  1777/11
X
Dimensions in millimetres
Figure 1 – Cabinets or racks configuration for test set up

– 8 – 61587-2 © IEC:2011
Table 1 – Load distribution within the cabinet

Cabinets A M3 M4 M5 Total load
according (mm) (kg) (kg) (kg) (kg)
IEC 60297-3-100 265,9 90 60 250
25 × 4 positions
IEC 60917-2-1 250 90 60 250
25 × 4 positions
4.3 Set up of the cabinets or racks to the vibration table
Mounting condition is referred to IEC 60068-2-6, in which there is reference to
IEC 60068-2-47.
The loaded cabinets or racks for the test may be mounted to the vibration table without using
interfaces such as concrete anchors, however the securing of the cabinet/rack to vibration
table shall use similar size and number of hold-down devices in accordance with the intended
bolt-down positions of field installed units. If a specific cabinet mounting condition is required,
the test should be performed with agreement between user and manufacture. If there are
several bolt-down patterns for fixing the cabinets or racks to the vibration table, the test shall
be performed under the worst bolt-down condition, that is, the largest stress works to the
bolts. For the block diagram of the test set-up configuration, see Figure 2.

Displacement
Cabinet or rack
transducer
Acceleration
Motor and actuator
Waveform generator monitor
Vibration table
and controller
IEC  1778/11
Figure 2 – Block diagram of test set up configuration
4.4 Measurement items
These items shall be measured and reported.
a) Measure the critical frequency and the damping ratio of the loaded cabinets or racks for
test with the sweeping sinusoidal or the random wave before and after the seismic test.
b) Measure the acceleration of the vibration table during the test.
c) Measure the accelerations of horizontal and vertical directions at the top, bottom, and
center of the cabinets or racks.
d) Measure the horizontal displacement of the top of the cabinet or rack at the attachment
point to the vibration table.
61587-2 © IEC:2011 – 9 –
5 Test waveform and acceleration condition
5.1 Introductory remarks
The parameters such as time history, zero period acceleration, damping ratio and severities
(frequency range, required response spectrum, acceleration axis) are referred to
IEC 60068-3-3 and 60068-2-57.
5.2 General
The test shall be performed as follows.
a) The test wave for the seismic test shall be a synthesized waveform.
b) The test shall be implemented with single-axis or tri-axial condition defined below, and
which method actually applied shall be recorded.
c) The duration of the strong part of the time history is defined as from the time when the
plot first reaches 25 % of the maximum value to the time when it falls for the last time to
the 25 % level.
d) The test response spectrum (TRS) shall equal or exceed the required response spectrum
(RRS) as shown in Figure 3 (for single axis) and Figure 5 (for tri-axes). The damping ratio
of 3 % or 2 % is applied to evaluate the TRS and RRS, and is not applied to the frequency
range less than 0,5 Hz and more than 50 Hz. The value of g, i.e., standard acceleration
.
due to the earth, is rounded up to the nearest whole number, that is 10 m/s
e) The test waveform shall be made to satisfy the RRS.
f) It is acceptable that the TRS is lower than RRS partially at the frequency range of lower
than half or larger than two-times of the 1st natural frequency, but shall not exceed 20 %
of RRS.
g) If TRS does not satisfy the RRS with the limitation of the displacement of the vibration
table, TRS shall equal or exceed the frequency range equal or larger than 1Hz.
5.3 Single-axis acceleration
a) Accelerate each axis of the vibration table independently.
b) The acceleration of the vibration table is measured during the test as shown 4.3 b).
c) The duration of the strong part of the time history shall be equal or more than 18 s.
d) The zero period acceleration of input test wave shall be 16 m/s .
e) The time-history of the test wave is shown in Figure 4.

– 10 – 61587-2 © IEC:2011
0,1  1  10  100
00.1.1 11 1010 100100
Frequency  (Hz)
FFrreequequencncyy　　　　HHｚｚ
IEC  1779/11
Figure 3 – The RRS for test wave (damping ratio 2 %)

17,5
17.17.55
15,0
15.0
15.0
12,5
12.12.55
10,0
10.0
10.0
7,5
7.5
7.5
5,0
5.0
5.0
2,5
2.5
2.5
0,0
0.0
0.0
–2,5
- 2.5
- 2.5
–5,0
-- 55.0.0
–7,5
- 7.5
- 7.5
–10,0
- 10.0
- 10.0
–12,5
- 12.5
- 12.5
––155,,00
- 15.0
- 15.0
-–17.17,55
- 17.5
0,00  4,00  8,00  12,00  16,00  20,00  24,00  28,00  32,00
0.00 4.00 8.00 12.00 16.00 20.00 24.00 28.00 32.00
0.00 4.00 8.00 12.00 16.00 20.00 24.00 28.00 32.00
Time (s)
Time　　sec.
Time　　sec.
IEC  1780/11
Figure 4 – Time-history of the test wave
5.4 Triaxial acceleration
a) Accelerate the vibration table to three axes, i.e., width, depth, and up and down directions
of the cabinets or racks, simultaneously.
b) Acceleration of individual axis is different from each other. The acceleration of the
vibration table is measured during the test as indicated in 4.3 b).
c) The duration of the strong part of the time-history shall be equal or more than 30 s.
d) The required maximum acceleration (zero period acceleration) for input test wave shall be
2 2
12 m/s for horizontal and 6 m/s for up-and-down. The RRS is shown in Figure 5.
e) Examples of time-histories for each axis are shown in Figure 6.
Acceleration  (m/s ) 22
AAcccceelleerratatiionon　　　　m/m/ss
AAccAcccelelcelerereraaatttiiionoon n  (　　mm/m//s )ss

61587-2 © IEC:2011 – 11 –
0,1 1 10 100
0.1 1 10 100
Frequency (Hz)
Frequency 　Hz
IEC  1781/11
a) Horizontal
0,1 1 10 100
0.1 1 10 100
Frequency (Hz)
Frequency Hz
IEC  1782/11
b) Up-and-down
Figure 5 – The RRS for test wave (damping ratio 3 %)
2 2
Acceleration  (m/s ) Acceleration  (m/s )
2 2
Acceleration  m/ s
Acceleration　　m/ s
– 12 – 61587-2 © IEC:2011
–4
-4
–8
-8
–12
- 12
0 10 20 30 40
0 10 20 30 40
Time  (s)
sec
Time  s
IEC  1783/11
a) longitude
–4
-4
–8
-8
–12
- 12
10 20 30 40
0 10 20 30 40
Time  (s)
sec
Time  s
IEC  1784/11
b) latitude
–2
-2
–4
-4
–6
-6
–8
-8
0 10 20 30 40
0 10 20 30 40
Time  (s)
sec
Time  s
IEC  1785/11
c) vertical
Figure 6 – Time-history of test wave for each axis
2 2 2
Acceleration  (m/s ) Acceleration  (m/s ) Acceleration  (m/s )
2 2 2
Acceleration  m/ s Acceleration  m/ s Acceleration  m/ s

61587-2 © IEC:2011 – 13 –
6 Assessment following the test
a) There is no permanent deformation to the cabinets or racks exceeding 6 mm or buckling
of any component.
b) There is no crack or break to the structural parts by visual inspection.
c) The displacement of the upper part of the cabinets or racks while the test shall not exceed
75 mm.
d) Subracks or plug-in units installed in the cabinets or racks remain in their installed
position.
e) Doors shall operate as intend
...