VME Subrack System 7 U
Product Definition
20836-715/-718
www.schroff.biz
10
R1.1, November 14, 2008
2.5 Thermals
The front boards are cooled by forced air convection through 3 speed controlled
24 VDC axial fans (each fan 170 m³/h (100 cfm)
The fans are assembled with the Fan Control Module (FCM) on a front-
pluggable Fan Tray.
The air enters the subrack at the bottom panel into the Fan Tray and passes
across the hot components on the Front Boards. Heat is carried away by forced
convection. The air exits the Subrack at the top.
The fan speed is controlled by the Fan Control Module (FCM) depending on the
exhaust temperature. The average temperature increase at full load is 6 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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