42 System overview
Fan cooling module – 5U enclosures
The five fan cooling modules (FCMs) at the rear of the enclosure maintain all system components below their
maximum temperature, assuming the ambient temperature is below 35ºC. Fan speed within the FCMs is governed
by the controller modules.
FCMs are hot-swappable. Replacement of an FCM can be performed while the enclosure is running, but the
procedure must be completed within two minutes of the removal of the defective module. Verify that you have a
replacement module on hand before removing the defective FCM.
Figure 35 LEDs: FCM – 5U enclosure rear panel
NOTE: The “System airflow” (page 40) topic introduced for the 2U enclosures applies equally to 5U enclosures.
Fan Cooling Module LED descriptions (see inset illustration detail above)
Module OK LED (Green) Fan Fail LED (Amber/blinking amber)
LED behavior
• If any of the FCM LEDs are illuminated amber, a module fault condition or failure has occurred.
• For a detailed description of FCM LED behavior, see “Fan cooling module LEDs” (page 100).
FCM LEDs Inset
Module OK
Fan Fail
FCM LEDs
(hidden)
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