3.2.1
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.
3.2.1.1
Double conversion mode
shows the path of electrical power through the UPS system when the
UPS is operating in the double conversion mode.
Figure 4. Path of current through the UPS in the double conversion mode
A Static
switch
1 Bypass in-
put
Main power flow
B Rectifier
2 Rectifier in-
put
Energized
C Inverter
3 Output
De-energized
D Battery con-
verter
4 Battery
breaker
Trickle current
E Battery
Closed
Open
Three-phase AC input power is converted to DC using a multilevel converter
with IGBT devices to produce a regulated DC voltage to the inverter. The UPS
status indicated on the display is
Unit Online
and the UPM status is
Active
.
The battery converter derives its input from the regulated DC output of the
rectifier and provides regulated charge current to the battery. The battery is
Eaton 91PS/93PS UPS 8–40 kW
User's and installation guide
©
Eaton Corporation plc 2018. All rights reserved.
Revision: 005
Document ID: P-164000493
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