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E E n n e e r r g g y y S S a a v v e e r r S S y y s s t t e e m m m m o o d d e e
Figure
Path of current through the UPS in the Energy Saver System mode shows the path of electrical
6:
power through the UPS system when the UPS is operating in the Energy Saver System (ESS) mode.
Figure 6. Path of current through the UPS in the Energy Saver System mode
A
Static switch
B
Rectifier
C
Inverter
D
DC/DC converter
E
Battery
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 operation 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 stored energy mode and continues to supply conditioned, clean power to the
critical load. The UPS switches automatically back to the ESS mode after the input voltages and
frequency have been inside the acceptable limits for an appropriate time.
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 operation 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%.
EATON 93PM G2 UPS
USER'S AND INSTALLATION GUIDE
1
Bypass input
2
Rectifier input
3
Output
4
Battery breaker
P-164000956 - February 2021
Main power flow
Energized
De-energized
Trickle current
Closed
Open
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