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Eaton 93E Generation 2 UPS 100-200 kVA
(380/400/415V)
load from the battery supply. If the unit requires service, applied loads are
transferred to the internal bypass either automatically or manually. With the
exception of an optional external battery cabinet, no other cabinets or equipment
are required for the single UPS to successfully support its applied loads.
The UPS supports a critical load in 4 different modes of operation.
Table 2: UPS operating modes
UPS operating mode
Double conversion mode
High-Efficiency (HE) mode
Bypass mode
Stored energy mode
3.2.1
During the double conversion (normal) mode, power for the system is derived
from a utility input source through the rectifier input contactor. Three-phase AC
input power is converted to DC using IGBT devices to produce a regulated DC
voltage to the inverter. When the battery contactor is closed, the battery is
charged directly from the regulated rectifier output by buck/boost DC/DC
converter, depending on the system voltage and the size of the battery string
attached to the unit.
3
Figure
UPS is operating in the double conversion (normal) mode.
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Eaton Corporation plc 2019. All rights reserved.
Double conversion (normal) mode
shows the path of electrical power through the UPS system when the
Description
Critical load is supplied by the inverter,
which derives its power from rectified utility
AC power. In this mode, the battery charg-
er also provides charging current for the
battery. Double conversion mode is the de-
fault operation mode.
Commercial AC power is supplied directly
to the critical load through the internal stat-
ic bypass switch and transfers automatical-
ly to the double-conversion mode if an ab-
normal condition is detected.
Critical load is supported directly by utility
power through the UPS static switch.
The battery provides DC power, which
maintains inverter operation. Batteries do
not support the load directly. Battery con-
verter supplies the DC-link which provides
supply for the inverter to support the critical
load.
Revision: 002
Document ID: P-164000848
User's and installation guide
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