Figure 1-81 Air flow in the NE40E-X8
1.9.3.2 Fan Speed Adjustment
When the system is fully configured, temperatures reported by the temperature sensors on the
Interface boards, SFUs, and MPUs serve as the basis for fan speed adjustment. Table 1-106
lists general principles.
Table 1-106 Fan Speed Adjustment Principles
Noise and Dissipation Standards
-5°C -
+27°C
(23°F -
80.6°F)
When fans rotate at a constantly low speed, the
noises meet the standard and the fans meet heat
dissipation requirements of a fully configured
system.
27°C -
40°C
(80.6°F -
104°F)
The fan speed is adjusted smoothly in linear mode,
without a sharp increase in noises.
Fans rotate at high speed to meet heat dissipation
requirements.
1.9.3.3 Fan Module
The fan modules, each containing one fan, are located side by side at the air exhaust vent. If a
single fan fails, the system can still work normally at an ambient temperature of 40°C (104°F)
for a short period of time.
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