Motorola MVME2400 - Manual (Page 129)

Specifications
http://www.mcg.mot.com/literature B-3
B
Note The power requirement listed for the MVME240x 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 MVME240x: +3.3V, +5V, +12V,
and -12V.
Cooling Requirements
The MVME240x VME processor Module is specified, designed, and
tested to operate reliably with an incoming air temperature range from 0°
to 55° C (32° to 131° 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 vendors’
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 achieved with 10 CFM
and 490 LFM flowing over the module. Less airflow is required to cool the
Asynchronous serial
debug port
PC16550
Front panel I/O through RJ45 connector
Front panel:switches and
status indicators
Reset and Abort switches
Four LEDs: BFL, CPU, PMC (one for PMC slot 2, one for slot 1)
Table B-1. MVME240 x Specifications (Continued)
Characteristics Specifications