INTRODUCTION
Eaton
Power Xpert 9395P UPS (300 kVA, 300 kW) Installation and Operation Manual
S
P-164000563 Rev 1
www.eaton.com/powerquality
1-5
In addition, when one UPM is taken out of service for maintenance or is not operating
properly, a redundant UPM continues to supply uninterrupted power to the critical
load. A Hot Sync Controller Area Network (CAN) Bridge Card provides connectivity
and operational mode control.
The tie cabinet is provided by the customer and must contain Module Output
Breakers (MOBs) with dual auxiliary contacts for control of the system. Without dual
auxiliary MOBs, UPMs are not allowed to go to bypass individually during servicing.
All UPMs will go to bypass instead of just the UPM needing service, decreasing
critical load protection. With dual auxiliary MOBs, one UPM can be bypassed while
the remaining UPMs support the load as long as the remaining UPMs have the
capacity to do so.
1.4.6
Input Output Module Configuration
The UPS can be supplied in an Input Output Module (IOM) configuration without the
bypass input connections, the static switch, and the backfeed protection contactor.
This configuration is primarily used in multiple UPS parallel systems that do not need
a bypass for each UPS and use a separate System Bypass Module (SBM) to provide
system bypass capabilities.
1.4.7
Continuous Static Switch
A continuous static switch is used to provide transfer of the load from the inverter to
the bypass source in the event the inverter become unavailable.
1.4.8
Inherent Redundancy
To deliver greater reliability, the Eaton 9395P UPS can be configured by an authorized
Eaton Customer Service Engineer
for inherent redundancy. When configured, the
UPS automatically becomes redundant if the load is at or below the capacity of the
UPMs minus the capacity of one UPM. Under normal conditions the UPMs in the
UPS share the load equally. If one or more UPMs becomes unavailable and the load is
at or below the capacity of remaining UPMs, the remaining UPMs supply the load
instead of transferring to bypass.
If the capacity of the UPMs falls below the redundancy level or the load increases
above redundancy level, but is still able to maintain the load, a loss of redundancy
alarm is sounded. If the load exceeds the capacity of remaining UPMs, the UPS
transfers to bypass.
1.4.9
Energy Saver and High Alert Modes
NOTE
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 eliminating
unnecessary power conversion when the commercial power source is within
acceptable voltage and frequency limits. In this mode, the UPS is actively monitoring
the 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.
