Rockwell Automation Allen-Bradley Guardmaster 440R-S35011, Руководство пользователя

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Rockwell Automation Publication 440R-UM014D-EN-P - December 2019 11
Installation Chapter 2
This equipment is intended for use in a Pollution Degree 2 industrial
environment, in overvoltage Category II applications (as defined in IEC
60664-1), at altitudes up to 2000 m (6562 ft) without derating. This
equipment is considered Group 1, Class A industrial equipment according to
IEC/CISPR 11. Without appropriate precautions, there can be difficulties
with electromagnetic compatibility in residential and other environments due
to conducted and radiated disturbances.
This equipment is supplied as open-type equipment. The relays must be
mounted within an enclosure that is suitably designed for those specific
environmental conditions that are present and appropriately designed to help
prevent personal injury as a result of accessibility to live parts. The interior of
the enclosure must be accessible only by the use of a tool. Subsequent sections
of this publication contain additional information regarding specific enclosure-
type ratings that are required to comply with certain product safety
certifications.
For more information, see:
• Industrial Automation Wiring and Grounding Guidelines, publication
1770-4.1 , for additional installation requirements.
• NEMA Standard 250 and IEC 60529, as applicable, for explanations of
the degrees of protection provided by different types of enclosure.
Prevent Excessive Heat
For most applications, normal convective cooling keeps the relay within the
specified operating range. Verify that the specified temperature range is
maintained. Usually, proper spacing of components within an enclosure is
sufficient for heat dissipation.
In some applications, other equipment inside or outside the enclosure can
produce a substantial amount of heat. In this case, place blower fans inside the
enclosure to help with air circulation and to reduce hot spots near the
controller.
Additional cooling provisions are necessary when high ambient temperatures
are encountered. Do not bring in unfiltered outside air. Place the controller in
an enclosure to help protect it from a corrosive atmosphere. Harmful
contaminants or dirt could damage components or cause improper operation.
In extreme cases, you may need air conditioning to help protect against heat
buildup within the enclosure.