Chapter 1: Introduction
Major Subsystem
Components
1-13
1.3.8 Cooling
Modules
Figure 1-11: Cooling Module
PN: GAL-9273ECFanMod
The subsystem is equipped with two (2), dual-fan, redundant cooling
modules. They are installed in the rear section of the PSU modules. Two (2)
LEDs on the PSU faceplate indicate the cooling fan status.
Intelligent Dual Speed Operation
The cooling fans in the cooling module operate with two rotation speeds.
Under normal conditions, the cooling fans run at the low speed, which is
sufficient for maintaining airflow across components. Under the following
conditions, cooling fans raise their rotation speed to increase airflow:
1.
Component Failure: if one cooling fan, a PSU, or a temperature
sensor fails, the remaining cooling fans automatically raise its
rotation speed.
2.
Elevated Temperature: if the temperature reading breaches the
upper threshold set for any of the interior temperature sensors, the
cooling fans automatically raise its rotation speed.
3.
During the subsystem initialization stage, the cooling fans operate
at the high speed and return to lower speed once the initialization
process is completed and that the subsystem has not discovered
any erroneous conditions.
