Surveon NVR7312(2U), Руководство пользователя

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2.6. PSU & Cooling Module
The two redundant, hot-swappable PSU have a power socket (1) , power switch (2) ,
PSU status LED (3) , cooling module (4) , retention screw (5) and an extraction
handle (6) .
The cooling modules can operate at three rotation speed settings. Under normal
operating conditions, the cooling fans run at the low speed. Under the following
conditions, cooling fans raise their rotation speed to increase the airflow:

Component failure: if a cooling module, PSU, or a temperature
sensor fails.

Elevated temperature: if the temperature breaches the upper
threshold set for any of the interior temperature sensors.

During the system initialization stage, the cooling fans operate
at high speed and return to low speed once the initialization
process has completed and no erroneous condition detected.
NOTE
There are two upper temperature thresholds: one for event notification and the
other for triggering higher fan rotation speed. The preset-value for event
notification can be changed using the firmware-embedded configuration utility,
while the fan speed trigger cannot be changed. Refer to the Firmware Operation
Manual for details.
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