Auxiliary Backup AC Power Supply

APPENDIX F.0 AUXILIARY BACKUP AC POWER SUPPLY

Appendix F.1 Overview

The Liebert FS must be operated with a backup AC power supply to protect the unit’s mechanical bearings if:

•the external DC supply is lost and

•the Liebert FS has developed a fault

If these two events occur simultaneously, the backup power supply will power the magnetic levitation hardware to prevent the rotating group from running on the mechanical touchdown bearings.

This section details the function of the backup power supply and how it should be attached to the Liebert FS. This is supplementary information—refer to appropriate sections of the user manual for details on installation and operation.

Appendix F.2 Backup AC Power Supply Specification

Voltage: 110 to 230VAC, 400VA

Frequency: 50 to 60Hz

Note: Connection to a 480VAC supply requires a 480 to 110 transformer, available from Liebert as an option.

Appendix F.3 Recommended Backup Power Supply Configuration

If the Liebert FS

 

 

is operating:

Liebert recommends:

For details, see:

 

 

 

In parallel

Attaching the backup AC power supply to the output of the UPS.

Figures 156 and 157

with batteries

 

 

 

Feeding the backup AC supply from a separate, protected supply.

 

Without batteries

This may be the output of another UPS or a supply from a separate

Figures 158 and 159

 

feeder circuit.

 

150

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Emerson SERIES 600T Appendix F.1 Overview, Appendix F.2 Backup AC Power Supply Specification, Frequency 50 to 60Hz
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Series 600, SERIES 600T specifications

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