Understanding UPS Operation
6-6
Power Xpert
TM
9395 UPS (450–825 kVA) Installation and Operation Manual
164201725—Rev 10
www.eaton.com/powerquality
Figure 6-3. Path of Current Through the UPS in Bypass Mode
If the UPS transfers to Bypass mode from Online mode due to any reason other than operator intervention, the
UPS automatically attempts to transfer back to Online mode (up to three times within a ten minute period). The
fourth transfer locks the critical load to the bypass source and requires operator intervention to transfer.
Static
Switch
K5
r
e
t
r
e
v
n
I
r
e
i
f
i
t
c
e
R
K1
K3
Battery
Converter
Battery
Battery
Breaker
Main Power Flow
Trickle Current
Energized
De-Energized
Closed
Open
Breakers
Contactors
K2
Bypass Input
Rectifier
Input
Output
Bypass
Breaker
(CB4)
Input
Breaker
(CB1
NOTE
On a UPS configured as an IOM, the bypass input, static switch, bypass breaker (CB4), and K5 are not present.
NOTE
On a UPS configured with a Continuous Static Switch (CSS), bypass breaker (CB4) is not present.
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