VME System Subracks 7 U / 8 U
Product Definition
20836-716/-719/-815
www.schroff.biz
10
R1.0, September 22, 2006
2.5 Thermals
The front boards are cooled by forced air convection through 3 speed controlled
24 VDC axial fans.
•
7 U System: each fan 170 m³/h (100 cfm).
•
8 U System: each fan 237 m³/h (140 cfm).
The fans are assembled on the bottom-hinged rear panel.
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 upper plenum, turns 90°, and is exhausted out the rear of the
subrack by fans.
The fan speed is controlled by the Fan Control Module (FCM) depending on the
exhaust temperature. The average temperature increase at full load is 10 K.
Figure 4: Airflow
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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