LAM 853-190023-001 電源平面
用戶有責任確保環(huán)境溫度不超過附錄A“規(guī)范”中規(guī)定的額定環(huán)境溫度。如果溫度超過規(guī)定的規(guī)格，溫度指示燈將閃爍紅色，如本章前面板和風扇模塊指示燈部分所述。設置風扇速度風扇速度選擇開關位于853-190023-001系列機箱的后面板上。請參閱圖1-2，853-190023-001系列機箱的后視圖，以定位風扇速度選擇開關。選擇“高”可獲得最大冷卻性能，選擇“自動”可提高聲學性能。當設置為Auto（自動）時，風扇轉(zhuǎn)速由底盤進氣溫度決定。高振動環(huán)境的注意事項在高振動環(huán)境中獲得最佳性能；使用2號十字螺絲刀將模塊化電源螺釘和電源換向安裝螺釘擰緊至11.5 lb·in.（1.3 N·m）。有關螺釘位置，請參見圖3-1，拆卸電源換向。安裝填充面板要保持模塊的正確冷卻性能，請將填充面板（隨機箱提供）安裝在未使用或空的插槽中。用提供的固定安裝螺釘固定。安裝插槽擋板可以通過安裝可選的插槽擋板來提高機箱的冷卻性能。有關更多詳細信息，
853-190023-001系列機箱設計用于在工作臺或儀器架上操作。底盤必須水平放置，以便在臺式機上使用。不支持機箱手柄向上的垂直方向配置。無論配置如何，都必須提供以下章節(jié)中概述的冷卻間隙。提供足夠的間隙853-190023-001系列的主冷卻排氣口位于機箱頂部。主進風口位于底盤后部。輔助進風口和排氣口位于底盤側(cè)面。機箱與周圍設備或堵塞物之間必須保持足夠的間隙，以確保機箱電源以及插入機箱的模塊得到適當冷卻。這些間隙如圖2-1所示。853-190023-001系列機箱的通風口853-190023-001。未能提供這些間隙可能會導致機箱或模塊出現(xiàn)與熱相關的故障。機箱環(huán)境溫度定義機箱風扇控制系統(tǒng)在自動風扇轉(zhuǎn)速模式下使用進氣溫度作為控制風扇轉(zhuǎn)速的輸入。因此，機箱環(huán)境溫度被定義為機箱后部風扇進氣口外的溫度。注意，該溫度可能高于環(huán)境室溫，這取決于周圍設備和/或存在的堵塞。
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. 853-190023-001See Figure 3-1, Removing Power Supply Shuttle, 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.853-190023-001
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.853-190023-001 It is the user’s responsibility to ensure that this ambient temperature does not exceed the rated ambient temperature as stated in Appendix A, Specifications. 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. 853-190023-001When set to Auto, the fan speed is determined by chassis intake air temperature.
The NI PXIe-1085 Series chassis is designed to operate on a bench or in an instrument rack. The chassis must be oriented horizontally for benchtop use.853-190023-001 Vertical orientation with the chassis handle up is not a supported configuration. Regardless of the configuration, you must provide the cooling clearances as outlined in the following sections. Providing Adequate Clearance The primary cooling exhaust vent for the NI PXIe-1085 Series is on the top of the chassis.853-190023-001 The primary intake vent is on the rear of the chassis. The secondary intake and exhaust vents are located along the sides of the chassis. Adequate clearance between the chassis and surrounding equipment or blockages must be maintained to ensure proper cooling of the chassis power supply as well as the modules plugged into the chassis.853-190023-001 These clearances are outlined in Figure 2-1. The vent locations for the NI PXIe-1085 Series chassis are shown in Figure 2-2. Failure to provide these clearances may result in thermal-related failures in the chassis or modules.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.