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Have you ever wondered why a heap of power ratings are conveyed in WATTS, a heap of in AMPS, a great deal of in VOLTS, and some in KVA? For a heap of in the hosting business this may be a very mixing up topic. Face it, masters in the content business are probably not electrical engineers, and most electrical engineers know not one thing regarding the creation and deliverance of content. This article will explain in simple terms the divergence among the major power ratings, and describe when each must be employed in your network architecture planning. According to APC, the main divergence amidst watts and volt amps is the watt rating determines the actual draw of power from a power source and the heat generated from equipment. The VA rating is used for sizing instrumentation such as circuit breakers, wiring, and UPS. The VA rating is commonly equivalent to or higher than the watt rating, as it includes the “power factor” in it is calculation. Power Factors The Power Factor is a calculation employed to account for the divergence in power furnishes applied to convert AC power into DC for use in electrical widgets and computer equipment. There are two types of power furnishes – the capacitor input supply and the power element corrected supply. Power factor corrected furnishes are employed in most high end computing and switching equipment, and have a symmetry of 1VA:1W – permitting a very simple calculation for scaling electrical instrumentation and UPS. Thus, in theory, if your power element is 1:1, and your UPS is an 80KVA UPS, then you would be capable to load the UPS to 100% of it is rating. Older electrical equipment, as well as most lower end computers and video instrumentation use capacitor input power furnishes and have a power element anyplace from.55 to.75 times the VA rating. Typically when scaling a UPS for use in a data center you will use a 60% load element on the UPS. If you overload a UPS it is closely sure to fail for the duration of a power outage, as the draw on the batteries will exceed the capacity of the UPS. Most new UPSs will mechanically go into battery bypass when an overload condition occurs. The 60% load element accounts for the high chance that most of the instrumentation drawing power through the UPS will be of a category that has a power factor of between.55 and.75. Example 1 You have a 10KVA UPS. Your data center has racks of low end self-assembled computers with a total approximated rating of 9000 watts. Your UPS will most like fail, as the power factor is probably around.70. You would need at least 12.85KVA to adequately backup the selective information center. Example 2 You have a 10KVA UPS. Your data center has racks of low end self-assembled computers with a total approximated rating of 6000 watts. Your UPS will be capable to handle the load, as the power element corrected rating will require approximately 8.5KVA of UPS. Some modern UPSs will genuinely tell you the intermediate power factor and real time load capacity of the UPS. Some Useful Conversion Factors o Refrigeration - 1 watt =.86 kcal/h - 1 watt = 3.412 Btu/h - 1 watt = 2.843 x 10-4 tons - 1 ton = 200 Btu/min - 1 ton = 12,000 Btu/h - 1 ton = 3,517.2 W o kVA Conversions Three phase kVA = V ï?–ïEUR A ï?–ïEUR √3 ⁄ïEUR 1000 Single phase kVA = V ï?–ïEUR A ⁄ïEUR 1000 Formulas kVA = Voltage x Current (amps) Watts = VA x PF BTU = Watts x 3.41 Most helpful customer reviews 22 of 22 people found the following review helpful. |
Fan is Constantly On — Even with No Load
