Eaton Power Xpert 9395 Installation And Operation Manual

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Understanding UPS Operation6-2 Eaton ® Power Xpert® 9395P-300 (300kVA, 300kW) UPS Installation and Operation Manual P-164000563—Rev 04 www.eaton.com/powerqualityThe emergency bypass consists of a continuous static switch, and a backfeed protection contactor K5. Thebypass breaker (if installed) is located in parallel with the static switch. The backfeed protection contactor islocated in series with the static switch. The static switch is armed and ready during normal operation.On a UPS configured as an Input Output Module (IOM), bypass circuitry is not installed. This configuration isprimarily used in multiple UPS parallel systems that do not need a bypass for each UPS and use a separateSystem Bypass Module (SBM) to provide system bypass capabilities.6.2 Single UPSA single UPS operates independently to support an applied load from the inverter, providing conditioned anduninterruptible AC power to the critical load from the output of the module. During an outage, the invertercontinues to operate, supporting power to the load from the battery supply. If the unit requires service, appliedloads are transferred to the internal bypass either automatically or manually. With the exception of a batterycabinet, no other cabinets or equipment are required for the single UPS to successfully support its appliedloads.6.2.1 ModesThe 9395P-300 UPS supports a critical load in five different modes of operation:l In Online mode, the critical load is supplied by the inverter, which derives its power from rectified utility ACpower. In this mode, the battery charger also provides charging current for the battery, if needed.l In Energy Saver mode, commercial AC power is supplied directly to the critical load through the continuousstatic switch and transfers automatically to Online mode if an abnormal condition is detected. The EnergySaver mode requires a UPS with a continuous static switch.l In Variable Module Management System mode, the UPS operates as a traditional double-conversion UPS,but selectively shifts the load to fewer UPMs to increase the efficiency of the UPS.l In Bypass mode, the critical load is directly supported by utility power.l In Battery mode, the battery provides DC power, which maintains inverter operation. The battery supportsthe critical load.The following paragraphs describe the differences in the five UPS operating modes, using block diagrams toshow the power flow during each mode of operation.6.2.2 Online ModeFigure 6-2 shows the path of electrical power through the UPS system when the UPS is operating in Onlinemode.During normal UPS system operation, power for the system is derived from a utility input source through therectifier input contactor K1. The front panel displays "Online" indicating the incoming power is within voltageand frequency acceptance windows. Three-phase AC input power is converted to DC using IGBT devices toproduce a regulated DC voltage to the inverter. When contactor K2 is closed the battery is charged directly fromthe regulated rectifier output through a buck DC converter.The battery converter derives its input from the regulated DC output of the rectifier and provides a buckedregulated DC voltage charge current to the battery. The battery is always connected to the UPS and ready tosupport the inverter should the utility input become unavailable.NOTE Variable Module Management System and Energy Saver modes are mutuallyexclusive.