GE TLE 625 UL S2 User Manual

Critical PowerModifications reserved Page 19/92GE_UPS_USM_TLE_SUL_M62_1M0_2US_V010.docx User Manual TLE Series 625 - 750 - 1000 UL S24.3.6 IEMi Operation Mode (option)NOTE !IEMi and eBoost Operation Mode are mutually exclusive; they cannot besimultaneously available on a system.Fig. 4.3.6-1 Functional diagram of a Parallel System RPA in IEMi Operation ModeGE offers the IEMi - Intelligent Energy Management integrated option to optimize energy cost whilemaintaining the highest possible reliability for Parallel Redundant Uninterruptible Power Supply units(max. 6).For Parallel System installations, secured with Redundant Parallel Architecture ™ (RPA ™), IEMi OperationMode saves energy by dynamically utilizing the UPS units as needed to meet the required load withoutcompromising the power quality to the critical load.The software will calculate the number of UPS units which are needed for load supply based onfollowing:• Redundancy (N+1 or N+2) • System Load • Rectifier status• Inverter operating time • IEMi Operation Mode programmingParticularly, the UPS control logic determines the minimal set of UPSs required to maintain a reliablesupply to the critical load.Then, an efficiency optimization algorithm determines the best UPS configuration in order to maintainthe running UPS in their highest efficiency operating region.Energy losses are reduced by switching the Inverter section of one or more units to a stand-by state.The critical load is fed by the remaining units operating in double-conversion.As load increases, other units are gradually switched on-line in order to maintain the requiredredundancy level.The IEMi - Intelligent Energy Management integrated option is only available on parallel installations.It is clear that in order to enjoy the benefits of IEMi operation a system programmed for N+1redundancy requires a parallel installation of at least three UPSs, while four UPSs are required for N+2redundancy.IEMi - Intelligent Energy Management integrated is an option, and it is available only if introduced at thefactory, or if introduced in field installations by a GE GLOBAL SERVICES FIELD ENGINEER.Benefits of IEMi - Intelligent Energy Management integrated include:• Higher efficiency (reduced losses) in low-load conditions (efficiency optimization)• No compromise on power quality (double-conversion operation)• No compromise on system reliability (redundant operation).