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This document describes how a Daul Mains Configuration operates in a Symmetra PX system.

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If the Dual Mains input to a double conversion UPS is used they are not equally routed through the UPS. One input is routed through the internal bypass static switch, the other input goes to the converter(s)/rectifier(s) and from there a DC circuit supplies energy to the inverter(s). The inverter(s) output is synchronized to the bypass input.

This allows the transfer with virtually no break from normal operation to bypass operation and also when returning to Normal Operation.

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