Specifications
4–4
VX1411 MainFrame Instruction Manual
Table 4–3: Cooling
Characteristic
Description
Slot Thermal Capacity
Figure 4–2 on page 4–5 shows the cooling curve of the
mainframe.
Cooling System
Forced air circulation (positive pressurization) with one
removable filter. Two internal DC fans provide cooling for
the power supply and the 13 VXIbus module slots.
Fan Speed Control
A rear panel switch chooses between full speed and low
speed. See Figure 4–1 on page 4-4 for maximum power
that the power supply can deliver while maintaining proper
cooling Vs temperature for the two fan speeds.
Slot Activation
Installing a VXIbus module activates the cooling for the
corresponding occupied slots by opening the IntelliGuide
mechanism. Only provides cooling to installed modules.
Slot Airflow Direction
P2 to P1, bottom of module to the top of module
Mainframe Intake
Bottom rear of mainframe
Mainframe Exhaust
Top sides of mainframe, also on top rear of mainframe
Cooling Clearance
Two inches on both sides and rear of mainframe
Pressurization
Positive (modules pressurized)
Filter Access
Filter accessible from rear of the mainframe
Ambient temperature (
_
C)
500
400
300
200
100
0
0
10
20
30
40
Full fan speed
Low or full fan
speed
Output
power (W)
50 55
60
Figure 4–1: Power output versus temperature for the 2 fan speeds
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