NI PXIe-8521控制模块工控
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品牌：NI
型号：NI PXIe-8521
产品说明：控制模块工控
优势：供应进口原装正品，专业停产配件。
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示例1：“负载要求”表显示NI PXIe-8521模块从+5VDC电源汲取：NI PXIe-8521910 mA。NI PXIe-8521两个12VDC电源均无电流要计算功耗，请将0.910安培乘以5伏特。答案是：Ŷ4.55瓦（该模块耗散的热量）示例2：“负载要求”表显示，NI PXIe-8521模块从+5VDC电源汲取：\374；80 mA；从+24V DC隔离电源汲取125 mA计算+5VDC电源的功耗：将0.08安培乘以5伏特，得出0.40瓦的值。要计算+24V直流电源的功耗：将0.125安培乘以24伏特，得出3.0瓦的值。将两者相加，该模块的总散热量为3.4瓦。第2步：PLC电源的计算90系列电源的基本规则是效率为66%。说明这一点的另一种方式是，电源每向PLC输送2瓦功率，就会以热量的形式消耗1瓦功率。因此，您可以使用上述步骤1中的方法计算特定电源所服务的机架中所有模块的总功率需求，然后将该数字除以2，得出电源消耗值。NI PXIe-8521
Example 1: The “Load Requirements” table shows that the INI PXIe-8521 module draws:NI PXIe-8521 910 mA from the +5VDC supply.NI PXIe-8521 No current from either of the two 12VDC supplies To calculate power dissipation, multiply 0.910 Amps times 5 volts. The answer is:NI PXIe-8521 4.55 watts (of heat dissipated by this module) Example 2: The “Load Requirements” table shows that the IC693MDL241 module draws:NI PXIe-852180 mA from the +5VDC supplyNI PXIe-8521 125 mA from the +24VDC Isolated supply To calculate power dissipation from the +5VDC supply: Multiply 0.08 Amps times 5 volts to arrive at a value of 0.40 watts. To calculate power dissipation from the +24VDC supply: Multiply 0.125 Amps times 24 volts to arrive at a value of 3.0 watts. Adding the two together yields a total heat dissipation by this module of 3.4 watts.Step 2: Calculation for PLC Power Supplies A basic rule for Series 90 power supplies is that they are 66% efficient. Another way of stating this is that the power supply dissipates 1 watt of power in the form of heat for every 2 watts of power it delivers to the PLC. Therefore, you can calculate the total power requirement for all of the modules in the rack served by a particular power supply using the method in Step 1 above, then divide that figure by 2 to arrive at the power supply dissipation value.
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