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Figure 15 Parallel system block diagram
Figure 16 Paralleling cabinet with input and bypass circuit breakers
UPS Module 2
UPS Module 3
UPS Module 4
480V, 3W
Output
IOB1
IOB2
IOB3
IOB4
UOB
480V DC
Battery Input
480V, 3W
Input
(Field Removable
Jumper for Dual
Input)
Bypass
Static
Switch
DC
DC
Liebert NX UPS (40-200kVA) Liebert NX Basic Paralleling Cabinet
AC
DC
DC
AC
RIB = Rectifier Input
Breaker
IOB = Inverter Output
Breaker
MBB = Maintenance
Bypass Breaker
MIB = Maintenance
Isolation Breaker
LDB = Load Distribution
Breaker
480V, 3W
System Input
480V, 3W
System Output
480V DC
Battery
Input
AC
DC
DC
AC
Bypass
Static
Switch
RIB 1
RIB 2
RIB 3
RIB 4 IOB 4
IOB 3
IOB 2
IOB 1
UPS Module 2
UPS Module 3
UPS Module 4
MBB
MOB
Liebert NX UPS (40-200kVA)
DC
DC
RIB = Rectifier Input
Breaker
IOB = Inverter Output
Breaker
MBB = Maintenance
Bypass Breaker
MIB = Maintenance
Isolation Breaker
LDB = Load
Distribution
Breaker