24579-4xx (CPCI Serial Systems 3+1 U)
10
Cooling
R1.0, January 2016
2 Cooling
The CPCI Serial boards and the power supplies are cooled by forced air convection through
three 12 VDC axial fans located in a hot-swappable fan tray.
2 different fan trays are available:
• Fan Tray with Fan Control Module (FCM), status LEDs and RESET button
(3 fans with 220 m³/h (130 cfm)).
• Fan Tray with constant speed fans
(3 fans with 140 m³/h (85 cfm)).
An air filter is available as an option for both fan trays.
Figure 8: Fan Tray with FCM
The fan speed is determined by a temperature sensor above the card cage. Up to 40 °C the
PWM is 20%, from 40 °C to 60 °C the PWM is increased continously from 20% to 100%.
This control characteristics can be changed by a DIP switch on the FCM. (See user manual,
order no.: 63972-312)
12315803
1
Display with Status LEDs
2
Fan Control Module
3
RESET Push Button (Grounds the PRST# signal)