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Auxiliary Backup AC Power Supply
152
Appendix F.3.2 Operating the Liebert FS Without Batteries
If the Liebert FS is operating without batteries, Liebert recommends feeding the backup AC power
supply from a separate, protected supply. This may be the output of another UPS or a supply from a
separate feeder circuit (see Figures 158 and 159).
Figure 158 A single Liebert FS unit operating with a UPS and without batteries attached to the DC bus
Figure 159 Multiple Liebert FS units operating with a UPS and without batteries attached to the DC bus
BACKUP AC
POWER SUPPLY
Liebert FS
Grid
Supply
UPS
Output
UPS
DC Bus
Fed from a protected AC
supply, either the output
of another UPS or a
separate feeder supply
3 Liebert FS Units
Grid
Supply
UPS
Output
UPS
DC Bus
BACKUP AC
POWER
SUPPLY
Distribution
panel*
Fed from a protected AC
supply, either the output
of another UPS or a
separate feeder supply
*NOTE:
Distribution panel allows
removal of a Liebert FS without
disrupting the other units