P-164000477 9395P750 kVA / 900 kVA and 1000 kVA / 1100 kVA 5
Revision 002 User’s and Installation Guide
1.2.6 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.
1.2.7 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.
1.2.8 Energy Saver and High Alert modes
The Variable Module Management System and Energy Saver System modes are mutually
exclusive.
Energy Saver mode allows the UPS to operate in Bypass mode. In this mode, the UPS is operating on
bypass, with the UPMs in standby, ready to automatically transfer to Normal mode 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 Normal mode
(inverter online) or if in Normal mode remains in Normal mode for a default time period of one hour. The
High Alert mode time period is configurable by an Eaton Customer Service Engineer. The High Alert
mode allows the user to place the unit online with full protection when outside conditions could cause
a power disturbance. At the end of the time period, the unit defaults back to Energy Saver mode. If the
High Alert mode is reactivated during the time period, the timer will be restarted.
1.2.9 Variable Module Management System and High Alert modes
The Variable Module Management System and Energy Saver System modes are mutually
exclusive.
The Variable Module Management System (VMMS) mode maintains UPM redundancy and achieves
higher efficiencies by intelligently controlling the UPM’s load level. The efficiency rating for each UPM
is highest when loads are 20-80% of its rating. Therefore, shifting the load to fewer UPMs can achieve
higher 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 less than 2 ms to respond to load changes.
To Next Page
Loading...
