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A Sag is a decrease in voltage on the utility supply side of the sensitive equipment from the utility. A Sag can occur due to numerous pieces of equipment, that share the same utility feed as the sensitive equipment, energizing at the same time resulting in a drop in voltage due to this sudden demand of power. A Sag can also occur when a transformer or motor that, due to their high inrush characteristic, is sharing the same utility feed as your sensitive equipment, is energized causing a drop in voltage. If a Sag goes below the input tolerance of your sensitive equipment it may abruptly shut down which may lead to damaged equipment or loss of data. Having a UPS InLine with your sensitive equipment offers protection when a Sag does occur. When a Sag occurs on the input side of the UPS, the Rectifier has a built in tolerance to withstand such a deviation of voltage. It accepts the Sag and is still able to rectify the AC into DC, as expected, doing its job.
If the Sag exceeds the tolerance of the UPS’s input, the Rectifier will not accept the voltage level and reject it and shut down until the input voltage returns within tolerance of the Rectifier. During this time the Inverter section will use the Battery for its source of DC to convert into AC supplying the load. Whether the Inverter receives DC either from the Rectifier or Battery, the result is a steady 120 VAC(1Φ), 208 VAC or 480 VAC(3Φ) output feeding your sensitive equipment.