Figure 56. Simplified Dual-Feed Ups With Maintenance Bypass Panel - Eaton Power Xpert 9395 550/275 Installation And Operation Manual

Understanding UPS Operation

Figure 56. Simplified Dual-Feed UPS with Maintenance Bypass Panel

To UPS
Rectifier
Input
RIB: Rectifier Input Breaker
BIB: Bypass Input Breaker
MIS: Maintenance Isolation Breaker
MBP: Maintenance Bypass Breaker
NOTE Ifi nstalling a maintenance bypass, a minimum of two separate feeds with upstream feeder breakers, or a single feed with two
upstream feeder breakers, must be provided: one for the UPS or rectifier input breaker (RIB) (ifi nstalled) and one for the maintenance
bypass input. DO NOT use a single feed or a single feeder breaker to supply both the UPS or RIB and the maintenance bypass. If a bypass
input breaker (BIB) is installed in the maintenance bypass and a single-feed UPS is being installed, a single feed to the maintenance
bypass is acceptable for supplying both the UPS and the bypass.
102 Eaton Power Xpert 9395 UPS Installation and Operation Manual 164201716—Rev 14
AC Input AC Input
To UPS
Bypass
Input
RIB
BIB
MIS
Output
from
UPS
MAINTENANCE
BYPASS PANEL
(Provided by Others)
Backfeed
Contactor
Static
Switch
K5
Output
Contactor
Battery
Breaker
BATTERY CABINET
MBP
CRITICAL LOAD
DISTRIBUTION UNIT
K3
UPS