Emerson 540VDC manual Appendix F.1 Overview, Appendix F.2 Backup AC Power Supply Specification

Models: 540VDC

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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,

the Liebert FS has developed a fault and

the configuration is two (and only two) flywheels arranged in a capacity configuration (i.e.: both flywheels are required to carry full load). Not applicable to a redundant configuration.

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, 500VA

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.

Figures 158 and 159

Without batteries

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

 

feeder circuit.

 

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DISCONTINUED

 

PRODUCT

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Image 162
Emerson 540VDC manual Appendix F.1 Overview, Appendix F.2 Backup AC Power Supply Specification, Frequency 50 to 60Hz