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Chapter 2
Installation and Configuration
Chassis Ambient Temperature Definition
The chassis fan control system uses intake air temperature as the input for controlling fan speeds
when in Auto Fan Speed mode. Because of this, the chassis ambient temperature is defined
as the temperature that exists just outside of the fan intake vents on the rear of the chassis.
Note that this temperature may be higher than ambient room temperature depending on the
surrounding equipment and/or blockages present. It is the user’s responsibility to ensure that this
ambient temperature does not exceed the rated ambient temperature as stated in Appendix A,
. If the temperature exceeds the stated spec, the temperature LED blinks red,
as discussed in the
Front Panel and Fan Module LED Indicators
section of this chapter.
Setting Fan Speed
The fan-speed selector switch is on the rear panel of the NI PXIe-1085 Series chassis. Refer to
Figure 1-2,
Rear View of the NI PXIe-1085 Series Chassis
, to locate the fan-speed selector
switch. Select
High
for maximum cooling performance or
Auto
for improved acoustic
performance. When set to
Auto
, the fan speed is determined by chassis intake air temperature.
Considerations for High Vibration Environment
For the best performance in a high vibration environment; tighten the modular power supply
screws and the power supply shuttle mounting screws to 11.5 lb · in. (1.3 N · m) using a
#2 Phillips screwdriver. See Figure 3-1,
, for screw locations.
Installing Filler Panels
To maintain proper module cooling performance, install filler panels (provided with the chassis)
in unused or empty slots. Secure with the captive mounting screws provided.
Installing Slot Blockers
The cooling performance of the chassis can be improved by installing optional slot blockers.
Refer to
ni.com
for more details.