84 Operation
3.2.6 Off BatteryThebattery plant can be disconnected fromthe UPS modules, if required for batterym aintenance,by opening the
modulebattery disconnect (MBD) circuit breaker(s). In thissituation the UPS system will continue to supply
conditionedpower 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 criticall oad is not protected from lo ss 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
(canaccommodate up t o 6UP S modules)
ToCriticalLoad
Battery
MBD
Battery
MBD
Battery
MBD
DISCONTINUED
PROD U C T