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Figure 6 Integrating a single Liebert FS unit into a UPS system
Several Liebert FS units can be put in parallel to achieve higher power output and higher ride-
through duration (see Figure 7). One or more Liebert FS units may also be connected in parallel with
a UPS battery plant (valve- regulated or wet cells) to provide an overall incremental reliability and
life improvement for the DC battery plant. In this situation, the Liebert FS unit would be connected
in parallel with the battery plant (through its own disconnect device) to the UPS DC Bus.
Figure 7 Integrating multiple Liebert FS units into a UPS system
EMERSON
Network Power
Lie be r t
CRITICAL
AC LOADS
UPS
Output
Breaker
UPS
DC
Bus
Liebert FS
Static
Switch
UPS
Rectifier
UPS
Input
Breaker
Feeder
Breaker
Bypass
Utility
GRID
Bypass
Breaker
UPS Block Diagram
EMERSON
Network Power
Lie ber t
EMERSON
Network Power
Lie ber t
EMERSON
Network Power
Liebert
Liebert FS
Unit #1
Liebert FS
Unit #2
Liebert FS
Unit #N
UPS
Output
Breaker
UPS
Input
Breaker
Feeder
Breaker
Bypass
Utility
GRID
CRITICAL
AC LOADS
UPS
DC Bus
Static
Switch
UPS Block Diagram
UPS
Inverter
UPS
Rectifier
Bypass Breaker