INTRODUCTIONEaton Power Xpert 9395P-1200 UPS (1200 kVA, 1200 kW) Installation and Operation Manual P-164000500 Rev 4 www.eaton.com/powerquality1-6The tie cabinet must contain Module Output Breakers (MOBs) with dual auxiliarycontacts for control of the system. Without dual auxiliary MOBs, UPMs are notallowed to go to bypass individually during servicing. All UPMs will go to bypassinstead of just the UPM needing service, decreasing critical load protection. With dualauxiliary MOBs, one UPM can be bypassed while the remaining UPMs support theload as long as the remaining UPMs have the capacity to do so.1.3.6 Input Output Module ConfigurationThe UPS can be supplied in an Input Output Module (IOM) configuration without thebypass input connections, the static switch, and the backfeed protection contactor.This configuration is primarily used in multiple UPS parallel systems that do not needa bypass for each UPS and use a separate System Bypass Module (SBM) to providesystem bypass capabilities.1.3.7 Continuous Static SwitchA continuous static switch is used to provide transfer of the load from the inverter tothe bypass source in the event the inverter become unavailable.1.3.8 Inherent RedundancyTo deliver greater reliability, the Eaton 9395P-1200 UPS can be configured by anauthorized Eaton Customer Service Engineer for inherent redundancy. Whenconfigured, the UPS automatically becomes redundant if the load is at or below thecapacity of the UPMs minus the capacity of one UPM. Under normal conditions theUPMs in the UPS share the load equally. If one or more UPMs becomes unavailableand the load is at or below the capacity of remaining UPMs, the remaining UPMssupply the load instead of transferring to bypass.If the capacity of the UPMs falls below the redundancy level or the load increasesabove redundancy level, but is still able to maintain the load, a loss of redundancyalarm is sounded. If the load exceeds the capacity of remaining UPMs, the UPStransfers to bypass.1.3.9 Energy Saver and High Alert ModesNOTE Energy Saver System mode requires the UPS to be factory built with a Continuous Static Switch(CSS).NOTE The Variable Module Management System and Energy Saver System modes are mutually exclusive.As a subset of Normal mode, Energy Saver mode maximizes efficiency by eliminatingunnecessary power conversion when the commercial power source is withinacceptable voltage and frequency limits. In this mode, the UPS is actively monitoringthe critical bus and instantly and seamlessly transitions 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 Energy Saver mode to double-conversionmode or if in double-conversion mode remains in double-conversion mode for adefault time period of one hour. High Alert mode allows the user to place the unit indouble-conversion mode when outside conditions could cause a power disturbance.At the completion of the time period, the unit defaults back to Energy Saver mode. Ifthe High Alert command is received during the time period, the timer will berestarted.
