UPS frame Number of UPMs
Static switch [kW] Internal battery
91PS 15 kW C-
model
1 15 No
91PS 30 kW 1 or 2 30 Yes
WARNING
Hazardous voltage can exist in the battery circuit until disconnected
from external battery source.
In the 30/40 kW frame, the two UPMs are paralleled internally.
The rectifier input switch and battery breaker are available as standard for all the
models. The internal MBS is available as option for all the models.
If utility power is interrupted or falls outside the parameters specified in Chapter
9.1 About technical data, the UPS uses a backup battery supply to maintain
power to the critical load for a specified period of time or until the utility power
returns. For extended power outages, the UPS allows you to either transfer to an
alternative power system (such as a generator) or shut down your critical load in
an orderly manner. The UPS bypass consists of a continuous-duty static switch
and a backfeed protection isolation device. All the models also include an internal
fuse in the bypass line. The backfeed protection and bypass fuse are located in
series with the static switch.
3.3 UPS operating modes
The UPS operating modes are as follows:
Operating mode Description
Normal operating modes:
Double conversion mode 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.
© Eaton Corporation plc 2020. All rights reserved. Revision: 006 Document ID: P-164000493 21 (126)
Eaton 91PS/93PS UPS 8–40 kW User’s and Installation Guide
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