Eaton Power Xpert 9395 UPS Installation And Operation Manual

Also see for 550: Installation and user manual Installation and operation manual Installation and user manual

Contents

Introduction1-6 Power Xpert TM 9395 UPS (450–825 kVA) Installation and Operation Manual 164201725—Rev 10 www.eaton.com/powerqualityIf the capacity of the UPMs falls below the redundancy level or the load increases above redundancy level, butis still able to maintain the load, a loss of redundancy alarm is sounded. If the load exceeds the capacity ofremaining UPMs, the UPS transfers to bypass.1.2.10 Energy Saver System and High Alert ModesAs a subset of Online mode, the Energy Saver System (ESS) mode maximizes efficiency by eliminatingunnecessary power conversion when the commercial power source is within acceptable voltage andfrequency limits. In this mode, the UPS is actively monitoring the critical bus and instantly and seamlesslytransitions to double-conversion mode (inverter online) if a commercial electrical power brownout, blackout,overvoltage, undervoltage, or out–of–tolerance frequency condition occurs.In High Alert mode the unit transfers from ESS mode to double-conversion mode or if in double-conversionmode remains in double-conversion mode for a default time period of one hour. High Alert mode allows theuser to place the unit in double-conversion mode when outside conditions could cause a power disturbance.At the completion of the time period, the unit defaults back to ESS mode. If the High Alert command isreceived during the time period, the timer will be restarted.1.2.11 Harmonic Reduction System (HRS)The Harmonic Reduction system mode of the 9395 UPS allows the UPS to actively reduce the input TotalDemand Distortion (TDD) and increase the input power factor while maintaining high efficiency operation inESS mode. The UPS uses one of its UPMs to perform this active harmonic cancellation.HRS mode uses an extra set of sensors (CTs) on the output bus of the unit. These sensors measure theharmonics created by loads attached to the UPS output and the system actively reduces these harmonics.The system must be in ESS mode to activate HRS mode. In HRS mode, the inverter is ON, the rectifier is OFFand the output contactor is CLOSED.HRS is a normal operating mode, not an alarm condition. The NORMAL light appears on the front of the UPS.1.2.12 Variable Module Management System and High Alert ModesThe Variable Module Management System (VMMS) mode maintains UPM redundancy and achieves higherefficiencies by intelligently controlling the UPM–s load level. The efficiency rating for each UPM is highestwhen loads are greater than 50% of the system rating. Therefore, shifting the load to fewer UPMs can achievehigher efficiencies when the UPS load is lighter.In VMMS mode, the UPS is actively monitoring the critical bus and UPMs are available to assume load in lessthan 2 ms to respond to load changes.The VMMS feature has three configurable modes of operation: Online mode, Online mode with VMMS, andHigh Alert mode. All modes are selectable from the front panel.VMMS mode supports both distributed bypass and SBM parallel configurations.In High Alert mode, all idle UPMs go online for one hour. At the completion of the hour, the UPS defaults backto VMMS mode. If the High Alert command is received during the one hour, the one hour timer will berestarted.NOTE Energy Saver System mode requires the UPS to be factory built with a ContinuousStatic Switch (CSS).NOTE The Variable Module Management System and Energy Saver System modes aremutually exclusive.NOTE Total Demand Distortion as defined by IEEE 519-1992 is the total root-sum-squareharmonic current distortion, in percent, of the maximum demand load current (thenameplate rating of a fully rated UPS).NOTE The Variable Module Management System and Energy Saver System modes aremutually exclusive.