VME64x System Subrack 10 U
Product Definition
20836-220
www.schroff.biz
11
R1.0, November 19, 2007
2.7 Thermals
The 10 U VME64x system subrack contains two interchangeable Fan Trays.
The Fan Trays are plugged-in at the rear top of the system behind a bottom-
hinged front panel and are hot-swappable.
Each Fan Tray contains a 24VDC radial fan (500 m³/h (295 cfm) each).
The air enters the subrack at the lower front into the bottom air plenum and turns
90° upward. As the air passes across the hot components on the Front Boards,
heat is carried away by forced convection. The air exits the Subrack at the top,
is drawn into the Fan Trays, turns 90°, and is exhausted out the rear of the
subrack.
The fan speed is controlled by the Fan Control Module (FCM) depending on the
exhaust temperature. The average temperature increase at full load is 12 K.
Figure 6: Air Flow
Caution!
To maintain proper airflow, all open slots must be covered with filler panels.
The filler panel should include an airflow baffle that extends to backplane.
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