P-164000476
9395P 500kVA / 600 kVA
62
Revision 002
User’s and Installation Guide
6.2 Single UPS
A single UPS operates independently to support an applied load from the inverter, providing
conditioned and uninterruptible AC power to the critical load from the output of the module. During an
outage, the inverter continues to operate, supporting power to the load from the battery supply. If the
unit requires service, applied loads are transferred to the internal bypass via the continuous-duty static
switch either automatically or manually. With the exception of a battery cabinet, no other cabinets or
equipment are required for the single UPS to successfully support its applied loads.
6.2.1 Modes
The Eaton 9395 UPS supports a critical load in five different modes of operation. The UPS can
automatically use all five modes, as required.
NOTE
The Variable Module Management System and Energy Saver System modes are mutually
exclusive.
The standard operation modes are:
•
In Normal mode, the critical load is supplied by the inverter, which derives its power from rectified
utility AC power. In this mode, the battery charger also provides charging current for the battery, if
needed.
•
In Battery mode, the battery provides DC power, which maintains inverter operation. The battery
supports the critical load.
•
In Bypass mode, the critical load is directly supported by utility power.
•
In Variable Module Management System (VMMS) mode, the UPS operates as a traditional double-
conversion UPS, but selectively shifts the load to fewer UPMs to increase the efficiency of the
UPS.
•
In Energy Saver System (ESS) mode, the critical load is directly supported by utility power, but with
the ability to automatically switch to Normal mode if an abnormal condition is detected.
The following sections describe the differences in the five UPS operating modes, using block diagrams
to show the power flow during each mode of operation.
6.2.2 Normal mode
Figure 6-2 shows the path of electrical power through the UPS system when the UPS is operating in
normal mode.
NOTE
On a UPS configured as an IOM, the bypass input, static switch, and K5 are not present.
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