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84 Operation
3.2.6 Off Battery
The battery plant can be disconnected from the UPS modules, if required for battery maintenance, by opening the
module battery disconnect (MBD) circuit breaker(s). In this situation the UPS system will continue to supply
conditioned power to the critical load, but if input power fails, the UPS system cannot supply power to the load.
Figure 53 Load on UPS (Battery Not Available)
CAUTION
When the UPS system is operating with the module battery disconnect (MBD)
circuit breaker(s) open, the critical load is not protected from loss of the utility
source power.
BIB
SKRU
MIB
MBB
I
R
#2UPS
CB1
CB2
I
R
#1UPS
CB1
System
Controls
I
R
#3UPS
CB1
CB2
RIB RIB
CB2
RIB BFB
Output
SBB
SBS
SCCT
SCCT
(can accommodate up to 6 UPS modules)
To CriticalLoad
Battery
MBD
Battery
MBD
Battery
MBD