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Auxiliary Backup AC Power Supply
151
Appendix F.3.1 Operating the Liebert FS+DC in Parallel With Batteries
If the Liebert FS is operating in parallel with batteries, Liebert recommends attaching the backup AC
power supply to the output of the UPS, as shown in Figures 156 and 157.
Figure 156 A single
Liebert FS+DC unit operating with a UPS in conjunction with batteries
Figure 157 Multiple
Liebert FS+DC units operating with a UPS in conjunction with batteries
BACKUP AC
POWER
SUPPLY
Liebert FS
Grid
supply
UPS AC
Output
Battery
pack
UPS
DC bus
3 Liebert FS units
Grid
supply
UPS AC
Output
Battery
pack
UPS
DC bus
BACKUP AC POWER SUPPLYDistribution
panel*
*NOTE:
Distribution panel allows
removal of a Liebert FS with-
out disrupting the other units