PM511V16 3BSE011181R1處理器單元模塊,培訓教程是指定、設(shè)計和測試在進氣溫度范圍內(nèi)可靠運行0?至55?C（32?至131?F），強制空氣以一定速度冷卻通常可通過使用100 CFM軸流風機實現(xiàn)。溫度鑒定在標準摩托羅拉VME系統(tǒng)中進行底盤。25瓦負載板插入兩個卡槽，每側(cè)一個，靠近測試板，以模擬高功率密度系統(tǒng)配置。三軸組件每個風機的額定功率為100 CFM的風機直接放置在VME下方卡片固定框架。
PM511V16 3BSE011181R1處理器單元模塊進氣溫度是在風機組件和卡籠，其中首先進入氣流遇到被測模塊。測試軟件作為模塊受到環(huán)境溫度變化的影響。案例關(guān)鍵的高功率密度集成電路的溫度是監(jiān)控以確保組件供應(yīng)商規(guī)范超過。而冷卻所需的確切風量取決于：? 環(huán)境空氣溫度? 電路板類型? 電路板數(shù)量? 配電盤的位置? 其他熱源通常使用10 CFM和490可以實現(xiàn)充分冷卻流經(jīng)模塊的線性調(diào)頻。需要更少的氣流來冷卻具有較低最大環(huán)境的環(huán)境中的模塊。在更有利的熱條件下，可以運行模塊在高于55?C的溫度下可靠運行，氣流增加。它重要的是要注意，除了空氣動器的額定CFM，決定實際體積以及流經(jīng)模塊的空氣速度。Atlas主板需要強制風冷。安裝MPC604時需要額外冷卻RISC處理器。3針收割臺（J17）安裝在為專用風扇供電的主板。參見冷卻一般信息一章中的要求部分溫度
The Motorola MVME177 VMEmodule 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 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:
? Ambient air temperature
? Type of board
? Number of boards
? Location of boards
? 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
module in environments having lower maximum ambients. Under more favorable thermal conditions, it may be possible to operate
the module reliably at higher than 55? C with increased airflow. It
is important to note that there are several factors, in addition to the
rated CFM of the air mover, which determine the actual volume
and speed of air flowing over a module.
Forced air cooling is required for the Atlas motherboard.
Additional cooling is required with the installation of the MPC604
RISC processor. A 3-pin header (J17) is provided on the
motherboard for powering a dedicated fan. Refer to the Cooling
Requirements section in the General Information chapter for
temperatur
