UNDERSTANDING UPS OPERATIONPower Xpert 9395 UPS (450–550 kVA) Installation and Operation Manual 164201701 Rev 3 www.eaton.com/powerquality6-8If at any time during the battery discharge the input power becomes available again,contactors K1 and K5 close and the rectifier begins to supply DC current to theconverter and inverter. At this point, the unit returns to Normal mode. Depending onthe total load and the duration of the battery discharge, battery current limit alarmsmay be seen for a short time due to the current required to recharge the battery.6.3 UPS System Oneline ConfigurationsThe system oneline drawings in this section show the simplified internal structure ofthe UPS, battery supply, and basic maintenance bypass.Oneline Drawing UPS ModelVoltageSystem TypeInput OutputFigure 6‐6 on page 6-99395-550/4509395-550/5009395-550/550480 480Single Reverse Transfer UPS – Two UPM, CommonRectifier Feed, Common Battery, Dual‐FeedConfigurationFigure 6‐7 on page 6-109395-550/4509395-550/5009395-550/550480 480Single Reverse Transfer UPS – Two UPM, CommonRectifier Feed, Separate Battery, Dual‐FeedConfigurationFigure 6‐8 on page 6-119395-550/4509395-550/5009395-550/550480 480Single Reverse Transfer UPS – Three UPM, CommonRectifier Feed, Common Battery, Dual‐FeedConfigurationFigure 6‐9 on page 6-129395-550/4509395-550/5009395-550/550480 480Single Reverse Transfer UPS – Three UPM, CommonRectifier Feed, Separate Battery, Dual‐FeedConfigurationFigure 6‐10 on page 6-139395-550/4509395-550/5009395-550/550480 480 Single Reverse Transfer UPS – Two UPM, CommonRectifier Feed, Common Battery, IOM ConfigurationFigure 6‐11 on page 6-149395-550/4509395-550/5009395-550/550480 480 Single Reverse Transfer UPS – Two UPM, CommonRectifier Feed, Separate Battery, IOM ConfigurationFigure 6‐12 on page 6-159395-550/4509395-550/5009395-550/550480 480 Single Reverse Transfer UPS – Three UPM, CommonRectifier Feed, Common Battery, IOM ConfigurationFigure 6‐13 on page 6-169395-550/4509395-550/5009395-550/550480 480 Single Reverse Transfer UPS – Three UPM, CommonRectifier Feed, Separate Battery, IOM ConfigurationFigure 6‐14 on page 6-179395-550/4509395-550/5009395-550/550480 480Single Reverse Transfer UPS – Two UPM, SeparateRectifier Feed, Separate Battery, Dual‐FeedConfigurationFigure 6‐15 on page 6-189395-550/4509395-550/5009395-550/550480 480Single Reverse Transfer UPS – Three UPM, SeparateRectifier Feed, Separate Battery, Dual‐FeedConfigurationFigure 6‐16 on page 6-199395-550/4509395-550/5009395-550/550480 480 Single Reverse Transfer UPS – Two UPM, SeparateRectifier Feed, Separate Battery, IOM ConfigurationFigure 6‐17 on page 6-209395-550/4509395-550/5009395-550/550480 480 Single Reverse Transfer UPS – Three UPM, SeparateRectifier Feed, Separate Battery, IOM ConfigurationFigure 6‐18 on page 6-219395-550/4509395-550/5009395-550/550480 480 Simplified Dual-Feed UPS with Maintenance BypassPanel