Eaton 91PS User And Installation Manual page 18

Eaton 91PS/93PS UPS 8-10 kW
3.2.1.1
3
Figure
UPS is operating in the double conversion mode.
Figure 3. Path of current through the UPS in the double conversion mode
A Static
switch
B Rectifier
C Inverter
D Battery con-
verter
E Battery
Single-/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
always connected to the UPS and ready to support the inverter should the utility
input become unavailable.
©
Eaton Corporation plc 2018. All rights reserved.
Double conversion mode
shows the path of electrical power through the UPS system when the
1 Bypass in-
put
2 Rectifier in-
put
3 Output
4 Battery
breaker
Closed
Main power flow
Energized
De-energized
Trickle current
Open
Revision: 003 Document ID: P-164000672
User's and installation guide
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