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MVME162-432
摩托羅拉MVME162嵌入式控制器的指定、設(shè)計(jì)和
經(jīng)測(cè)試，可在0°至0°的進(jìn)氣溫度范圍內(nèi)可靠運(yùn)行
55°C（32°至131°F），強(qiáng)制空氣冷卻速度通?？梢赃_(dá)到
使用100 CFM軸流風(fēng)機(jī)。溫度鑒定在
標(biāo)準(zhǔn)摩托羅拉VMEsystem 3000機(jī)箱。二十五瓦負(fù)載板
插入兩個(gè)卡槽中，每側(cè)一個(gè)，與下面的板相鄰
測(cè)試，以模擬高功率密度系統(tǒng)配置。一組
三臺(tái)軸流風(fēng)機(jī)，每個(gè)風(fēng)機(jī)的額定值為100 CFM，直接放置在VME下方
卡片固定框架。在風(fēng)扇之間測(cè)量進(jìn)氣溫度
組件和卡盒，其中進(jìn)入的氣流首先遇到
正在測(cè)試的控制器。當(dāng)控制器受到
環(huán)境溫度變化。臨界高功率外殼溫度
對(duì)密度集成電路進(jìn)行監(jiān)控，以確保組件供應(yīng)商
未超出規(guī)格。
而冷卻所需的確切風(fēng)量取決于
環(huán)境空氣溫度和電路板的類型、數(shù)量和位置，以及
對(duì)于其他熱源，通?？梢杂?0 CFM實(shí)現(xiàn)充分冷卻
490 LFM流經(jīng)控制器。需要較少的氣流來冷卻
控制器在具有較低大環(huán)境的環(huán)境中。在“更多”下
良好的熱條件，可以操作控制器
在高于55°C且氣流增加的情況下可靠運(yùn)行。需要注意的是
除了空氣移動(dòng)器的額定CFM外，還有幾個(gè)因素
確定流經(jīng)控制器的空氣的實(shí)際體積和速度。
The Motorola MVME162 Embedded Controller 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 3000 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
controller under test. Test software is executed as the controller 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 controller. Less airflow is required to cool the
controller in environments having lower maximum ambients. Under more
favorable thermal conditions, it may be possible to operate the controller
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 the controller.
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