BS EN 61587-2-2011 pdf download.Mechanical structures for electronic equipment Tests for lEO 60917 and IEC 60297 Part 2: Seismic tests for cabinets and racks.
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 tn-axis acceleration as the seismic test wave condition. The single-axis or tn-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.
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.
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.
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.BS EN 61587-2-2011 pdf download.