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Stored energy mode
Bypass mode
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N N o o r r m m a a l l o o p p e e r r a a t t i i n n g g m m o o d d e e s s
This is a UPS with several normal operating modes: Double conversion, Double conversion with VMMS,
and ESS with double conversion on-demand. During normal UPS operation, power for the system is
derived from a utility input source. Unit Online, Unit Online VMMS, or Unit Online ESS is
displayed on the front panel, indicating that the incoming power is within voltage and frequency
acceptance windows.
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D D o o u u b b l l e e c c o o n n v v e e r r s s i i o o n n m m o o d d e e
Figure
Path of current through the UPS in the double conversion mode shows the path of electrical
5:
power through the UPS system when the UPS is operating in the double conversion mode.
Figure 5. Path of current through the UPS in the double conversion mode
A
Static switch
B
Rectifier
C
Inverter
D
DC/DC
converter
E
Battery
EATON 93PM G2 UPS
USER'S AND INSTALLATION GUIDE
1
Bypass input
2
Rectifier input
3
Output
4
Battery breaker
Closed
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
Critical load is supported directly by utility power
through the UPS static switch.
P-164000956 - February 2021
Main power flow
Energized
De-energized
Trickle current
Open
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