2-4 | ni.comChapter 2 Installation and ConfigurationSetting Fan SpeedThe fan-speed selector switch is on the rear panel of the NI PXIe-1075 chassis. Refer toFigure 1-2, Rear View of the NI PXIe-1075 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.Installing Filler PanelsTo 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 BlockersThe cooling performance of the chassis can be improved by installing optional slot blockers.Refer to ni.com for more details.Rack MountingRack mount applications require the optional rack mount kits available from NationalInstruments. Refer to the instructions supplied with the rack mount kits to install yourNI PXIe-1075 chassis in an instrument rack. Refer to Figure A-3, NI Chassis Rack Mount KitComponents.Note You may want to remove the feet from the NI PXIe-1075 chassis when rackmounting. To do so, remove the screws holding the feet in place.Connecting Safety GroundCaution The NI PXIe-1075 chassis are designed with a three-position NEMA 5-15style plug for the U.S. that connects the ground line to the chassis ground. Tominimize shock hazard, make sure the electrical power outlet you use to power thechassis has an appropriate earth safety ground.If your power outlet does not have an appropriate ground connection, you must connect thepremise safety ground to the chassis grounding screw located on the rear panel. Refer toFigure 1-2, Rear View of the NI PXIe-1075 Chassis, to locate the chassis grounding screw. Toconnect the safety ground, complete the following steps:1. Connect a 16 AWG (1.3 mm) wire to the chassis grounding screw using a grounding lug.The wire must have green insulation with a yellow stripe or must be noninsulated (bare).2. Attach the opposite end of the wire to permanent earth ground using toothed washers or atoothed lug.