Eaton Power Xpert 9395P-1100/1100 Installation And Operation Manual

Also see for Power Xpert 9395: Installation and operation manual Installation and operation manual Installation and operation manual Installation and operation manual Installation and operation manual

114 Eaton® Power Xpert® 9395P-1200 Installation and Operation Manual 164000500—Rev 11On 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.66..22 SSiinnggllee UUPPSSA 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, continuous-duty static switch either automatically or manually.With the exception of a battery cabinet, no other cabinets or equipment are required for the single UPS tosuccessfully support its applied loads.66..22..11 MMooddeessThe Eaton 9395P-1200 UPS supports a critical load in five different modes of operation:NOTE The Variable Module Management System and Energy Saver System modes aremutually exclusive.• 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.• 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.• In Variable Module Management System (VMMS) 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.• In Bypass mode, the critical load is directly supported by utility power.• 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 UPS operating modes, using block diagrams to showthe power flow during each mode of operation.66..22..22 OOnnlliinnee MMooddeeFigure 63 shows the path of electrical power through the UPS system when the UPS is operating in Onlinemode.During normal UPS operation, power for the system is derived from a utility input source through the rectifierinput contactor K1. The front panel displays “Online,” indicating the incoming power is within voltage andfrequency 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 directlyfrom the regulated rectifier output through a buck or boost DC converter, depending on the system voltage andthe size of the battery string attached to the unit.The battery converter derives its input from the regulated DC output of the rectifier and provides either aboosted or bucked regulated DC voltage charge current to the battery. The battery is always connected to theUPS and ready to support the inverter should the utility input become unavailable.The inverter produces a three-phase AC output to a customer's load without the use of a transformer. Theinverter derives regulated DC from the rectifier and uses IGBT devices and pulse-width modulation (PWM) toproduce a regulated and filtered AC output. The AC output of the inverter is delivered to the system outputthrough the output contactor K3.Understanding UPS Operation