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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 Two Liebert FS units operating in a paralleled for capacity (not redundancy) configuration, 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
Liebert FS
Fed from a
protected AC
supply, either
the output of
another UPS
or a separate
feeder supply
BACKUP AC
POWER SUPPLY
3 Liebert FS Units
Grid
Supply
UPS
Output
UPS
DC Bus
Distribution
panel*
* NOTE:
Distribution panel allows
removal of a Liebert FS without
disrupting the other units
DISCONTINUED
PRODUCT