Chassis Cooling Considerations - Motorola MVME956AC User Manual

General Information
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Chassis Cooling Considerations

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Caution
1-8
This equipment is intended for use in a relatively clean environment
(office or lab). In some industrial environments, you may need to
provide additional protection against airborne contaminants in order
to assure reliable operation of the floppy disk and magnetic tape
drives and media.
This equipment is intended for use in an enclosure consisting of the
front bezel together with the Motorola top panel and side panels or
equivalent. Operating this equipment without a front bezel may
compromise compliance with RFI and/or product safety
regulations. It may expose the operator to electrical and mechanical
hazards.
The system integrator must ensure that all modules used in the
system are properly cooled. The following information will
help you to determine whether the cooling is adequate.
The MVME956AC chassis is designed for an input air temperature below
40 degrees Celsius. Three DC-powered fans provide forced-air cooling for
the power supply, mass storage enclosure, and VME modules. The
direction of air flow is: in at the bottom of the chassis, past the power
supply and VME modules, and out the top of the chassis. The 24-volt fans
deliver 81 CFM at zero inches of water. An air filter is optional.
The fans provide airflow sufficient for most VME modules, but some high-
density, high-power modules may require more cooling than this enclosure
provides. When integrating VME modules that are known to be difficult to
cool, testing is advisable to confirm that such modules are properly cooled.
No forced air cooling is provided for the rear-mounted modules. The rear-
mounted modules are typically transition modules with few active
components, and cooling is generally not required.
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