Eaton 93E G2 100/100 User And Installation Manual page 22

Eaton 93E Generation 2 UPS 100-200 kVA
(380/400/415V)
Figure 4. Path of current through the UPS in the bypass mode
A Static
switch
B Rectifier
C Inverter
D Battery con-
verter
E Battery
In the bypass mode, the output of the system is provided with three-phase AC
power directly from the system input. While in this mode, the output of the
system is not protected from voltage or frequency fluctuations or power outages
from the source. Some power line filtering and transient protection is provided to
the load, but no active power conditioning or battery support is available to the
output of the system in the bypass mode.
The internal bypass is comprised of a solid-state, silicon-controlled rectifier
(SCR) continuous static switch, and an internal backfeed protection contactor.
The static switch is used instantaneously anytime the inverter is unable to
support the applied load. The continuous static switch is wired in series with the
backfeed protection contactor, and together they are wired in parallel with the
rectifier and inverter.
The static switch, being an electronically-controlled device, can be turned on
immediately to pick up the load from the inverter while inverter output contactor
©
Eaton Corporation plc 2019. All rights reserved.
1 Bypass in-
put
2 Rectifier in-
put
3 Output
4 Battery
breaker
Closed
Revision: 002
User's and installation guide
Main power flow
Energized
De-energized
Trickle current
Open
Document ID: P-164000848 22 (118)