Kontron AM4211 - Manual (Page 39)

24 AM4211
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4.2.2.1 How to Read the Diagram
The diagram contains multiple curves displaying the thermal sensors temperature versus the provided
airflow and the proper system class required. Full thermal load is not expected to be reached under real
operating conditions. For a given flow rate there is a maximum airflow input temperature (= ambient
temperature) provided. Below this operating point, a safe operation is guaranteed. Above this operating
point, the chassis thermal management must become active and take the necessary steps to protect the AMC
from thermal destruction.
4.2.2.2 Airflow
At a given cross-sectional area and a required flow rate, an average, homogeneous airflow speed can be
calculated using the following formula:
Airflow = Volumetric flow rate / area.
The airflow is specified in m/s = meter-per-second or in LFM = linear-feet-per-minute, respectively.
Conversion: 1 LFM = 0.00508 m/s; 1 m/s = 196.85 LFM
The following figure illustrates the operational limits of the AM4211 taking into consideration power
consumption vs. ambient air temperature vs. airflow rate. The values are based on simulation data taking
into account the actual power values of all components.
Figure 4-2:100% Operational Limits for the AM4211
WARNING
In all situations, the maximum specified case temperature of the components must
be kept below the maximum allowable temperature.