Cooling Requirements - Motorola MVME2301 Installation And Use Manual

Table B-1. MVME230 x Specifications (Continued)
Characteristics
Asynchronous serial
debug port
Front panel:switches
and status indicators
Note

Cooling Requirements

The MVME230x VME processor Module is specified, designed, and
tested to operate reliably with an incoming air temperature range
from 0û to 55û C (32û to 131û F) with forced air cooling of the entire
assembly (base board and modules) at a velocity typically
achievable by using a 100 CFM axial fan. Temperature qualification
is performed in a standard Motorola VMEsystem chassis.
Twenty-five-watt load boards are inserted in two card slots, one on
each side, adjacent to the board under test, to simulate a high power
density system configuration. An assembly of three axial fans, rated
at 100 CFM per fan, is placed directly under the VME card cage. The
incoming air temperature is measured between the fan assembly
and the card cage, where the incoming airstream first encounters
the module under test. Test software is executed as the module is
subjected to ambient temperature variations. Case temperatures of
critical, high power density integrated circuits are monitored to
ensure component vendorsÕ specifications are not exceeded.
While the exact amount of airflow required for cooling depends on
the ambient air temperature and the type, number, and location of
boards and other heat sources, adequate cooling can usually be
PC16550
Front panel I/O through RJ45 connector
Reset and Abort switches
Four LEDs: BFL, CPU, PMC (one for PMC slot 2, one for slot 1)
The power requirement listed for the MVME230x does
not include the power requirements for the PMC slots.
The PMC specification allows for 7.5 watts per PMC
slot. The 15 watts total can be drawn from any
combination of the four voltage sources provided by
the MVME230x: +3.3V, +5V, +12V, and -12V.
Cooling Requirements
SpeciÞcations
B
B-3