Off-Line Power Supply (UPS), line types Including interactive kinds are often on-line for small offices or data center applications, on the basis of the purchase and operating costs lower, preferably justified despite the relatively poor protection . This approach fails to recognize the differences between the on-line UPS systems, such as the ability of some on-line systems in Economics (ECO) mode, which can offer better performance with less protectionCosts.
Easy Off Line UPS systems, connect the load directly to the AC line input. line-interactive systems also have the opportunity to correct the UPS output when the input AC voltage deviates beyond the limits fixed by an auto transformer-based Automatic Voltage Regulator. In the event of significant low voltage or failures of these transfer systems UPS battery operation.
Because of its direct connection to the AC input, such as off-line, including line interactive systems providemore efficient than a UPS online. But he could, unstable grid environment, as happens in the summer air conditioning or the stormy winter months, with frequent trips or power outages cause these systems suffer from frequent transfers to battery. Sun exposure in the critical load for possible losses due blurred or transmission is successful or a failure of the battery, because the battery runs many, which drastically reduce battery lifeTime.
An on-line UPS system, often referred to as the double conversion system to stabilize first converts the DC input voltage, which is then converted into AC, continuously feeds the critical load with pure sine wave output, both from the command line of AC / DC transformer, or batteries in case of power failure.
The topology described on-line double conversion, while providing the best protection reduces efficiency single-phase UPS up to 90% compared to97%, with Line Interactive Systems reached. The additional operating costs, may be associated with reduced efficiency, about 10% per year added to the cost of the first UPS where cooling costs are not included.
Recently, in line UPS with Eco-mode operating system offered by some manufacturers for low-power single-line systems. The Eco-operation, if selected, allows online UPS works automatically transferred directly from the power supply on-line operation fails orExcursion to set limits on the incoming AC line.
However, there is a big difference between the works Line Interactive UPS online under Eco-mode. An online UPS system must always work from the network with the battery backup mode for a short period of backup, while an online system can work continuously in both modes.
A line interactive UPS, will work on the electricity grid has held in an unstable environment with frequent transfers battery. A UPS on-line in asuch as the environment behaves the same way when it is set to Eco. But even here, most of the threats described by the double conversion mode selection can be avoided in unstable network season. Some UPS systems will operate automatically under the on-line operation, even if the mode selected Eco useful in detecting unstable environment.
The gain associated with Eco-mode is pretty tempting. With the best offer both protection and efficiency, is a kind best of all "solution worlds.UPS systems with bag Eco-Mode, on average, about 5% of energy savings without taking into account the efficiency UPS. Taking into account the cooling demand, almost 10% of wasted energy can be saved by reducing UPS initial investment of almost 20% annually, compared to normal operation in the further.
Surprisingly, the Eco-function is not usually a price tag. His reaction is mainly software-based manufacturer of competitive position and preferred not to raise prices UPS.Online UPS with Eco-mode should therefore preferred unless other considerations are relevant.
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