VME System Subracks 7 U / 8 U
Product Definition
20836-716/-719/-815
www.schroff.biz
11
R1.0, September 22, 2006
2.6 Fan Control Module (FCM)
The Fan Control Module (FCM):
•
Monitors and controls up to four fans
•
Monitors the signals from up to four temperature sensors
•
Controls the Display Module
•
Speed up the fans in case of a failure of one fan
•
Is able to communicate with the optional Chassis Monitoring Module (CMM)
Up to four NTC temperature sensors can be connected to the FCM. The highest
temperature level is the reference for the fan speed. If one ore more sensors
exceed 60° C the output for the temperature fail LED and a digital output are
activated. Since the fan speed is temperature controlled by the FCM, the fans
rotate with the lowest speed possible. Lower speeds reduce acoustic noise and
increase the longevity of the fans.
The FCM also controls a Display Module. 3 green LEDs signal the 3 VME
voltages, two red LEDs signal over-temperature and fan fail events.
Figure 5: Diagram fan speed/temperature
8
For more information see the FCM’s User Manual, Order No.: 73972-083 and at
www.schroff.biz
10006807
60
100
Fan Speed
(%)
Over-Temp.
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