In the ESS mode, the UPS safely provides mains current directly to the load
when the input is within the acceptable limits by its voltage and frequency. The
UPS status indicated on the display is
Unit Online ESS
, and the UPM status is
Active
. In case any disturbances are detected in the incoming power, the UPS
switches to the double conversion mode and continues to supply the critical load
through its inverter. In case of a complete utility outage or if the input power is
outside the tolerances of the system, the UPS transfers to the supported energy
mode and continues to supply conditioned, clean power to the critical load.
When operating in the ESS mode, the UPS's superior detection and control
algorithms continuously monitor the incoming power quality and allow fast
engagement of the power converters. Typical transition time to the double
conversion mode is less than 2 milliseconds, which is practically seamless.
When the power conditions are within acceptable limits, the UPS operates as a
high efficiency, energy-saving system. The energy saver system increases
system efficiency up to 99 % when supplying 20-100% of nominal load, reducing
energy losses by up to 80%.
3.3.2
Stored energy and battery mode
When running normally in the double conversion or ESS mode, the UPS
automatically transfers to supply the load from batteries or some other stored
energy source if a utility power outage occurs, or if the utility power does not
conform to the specified parameters. The UPS status indicated on the display is
On Battery
, and the UPM status is
Active
. In the stored energy mode, the DC
source provides emergency DC power, which is converted to regulated output
power by the inverter.
Figure 7: Path of current through the UPS in the battery mode
shows the path of
electrical power through the UPS system when operating in the battery mode.
© 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
