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 DC/DC
converter also provides charging current
for the DC source, if needed.
Variable Module Management System
(VMMS) mode
Critical load is supplied by the inverter. The
inverter derives its power from rectified
utility AC power, identically to double
conversion mode. In the VMMS mode, the
93PM G2 UPS system is able to optimise
the load level per power module: the
operating efficiency is significantly
improved when operating load is below 50
% of UPS capacity. The UPS system will
automatically place the redundant power
modules to suspended mode. In case of
any anomalies in utility or a sudden load
increase, the suspended power modules
are able to transfer to online mode with
less than 2 ms transition time.
Energy Saver System (ESS) mode
Critical load is supported securely by utility
power through the static bypass switch
with double conversion available on-
demand with typically less than a 2 ms
transition time, should any abnormal
condition be detected in the utility.
Operating the UPS in the ESS mode
increases system efficiency up to 99 %,
allowing significant savings in energy
losses without compromising system
reliability
Stored energy mode
Energy is drawn from a DC backup power
source and converted to AC power by the
UPS inverter. Most commonly VRLA
batteries are introduced to the system for
this purpose, and the mode of operation is
called the battery mode
Bypass mode
Critical load is supported directly by utility
power through the UPS static switch.
3.3.1
Normal operating modes
During normal UPS operation, power for the system is derived from a utility input
source.
Unit Online
is displayed on the front panel, indicating that the
incoming power is within voltage and frequency acceptance windows.
© Eaton Corporation plc 2020. All rights reserved.
Revision: 001
Document ID: P-164000956
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Eaton 93PM G2 UPS 50 – 360 kVA
User’s and Installation Guide
