Basics
2
Basics
This section introduces the most important basic terms with regard to "power supply units".
This information will enable you to choose the power supply unit that best meets your
requirements.
2.1
Mechanical Structure
Shock protection
Foreign body protection
Water protection
IP20
Shock resistance
Vibration resistance
The mechanical structure and the housing of the device largely determine its compliance
with safety regulations and thus the possible installation location of the power supply unit.
According to EN 60529, particular attention must be paid to shock protection, foreign body
protection and water protection. These degrees of protection are listed in the IP
(International Protection) code.
Generally, IP20 protection is adequate for dry rooms and control cabinets. This degree of
protection ensures reliable protection from touching live components and prevents
penetration of foreign particles with a diameter of more than 12.5 mm (0.5 in.). Protection
against water is not provided. If required, the devices are installed in a control cabinet,
which itself ensures the desired degree of protection.
Further important parameters are the resistance of the power supply unit to shock and
vibration.
The parameters "shock resistance" and "vibration resistance" provide information on what
mechanical pressures the device structure will withstand. The shock resistance of devices
is specified in IEC 60068-2-27. The vibration resistance is tested according to
IEC 60068-2-6.
Solidly-constructed devices should be able to withstand vibration of 2.3g in the frequency
range from 10 Hz to 150 Hz (g = gravitational acceleration).
Examples are devices for general industrial applications, power stations and devices used
in the operating area of heavy rotating machine parts.
Shock resistance provides information on the operating and transport conditions of the
devices. For industrial requirements, acceleration peaks of 30g over a shock period of 18
ms is considered sufficient. Power supply units tested according to these conditions can,
in the completely installed control cabinet, be transported to the installation location without
slipping from the mounting rail.
5598_en_03
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2-1
相关PDF资料
2938853 DIN RAIL POWER SUPPLY 24VDC 5A
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299D225X0025AB1 CAP TANT 2.2UF 25V 20% RADIAL
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