Auxiliary Backup AC Power Supply

Appendix F.4 Scenarios

This section describes five scenarios that might occur.

•Loss of backup AC supply at 0 RPM - This causes a fault message to appear on the control panel to indicate there is a problem with the backup supply. The unit will not start until the backup supply is reinstalled.

•Loss of backup AC supply at full speed - This causes a warning message to appear on the con- trol panel to indicate there is a problem with the backup supply. This warning does not affect the operation of the system.

•Loss of external DC supply - The Liebert FS will discharge normally until it reaches

25000 RPM. It will then change to shutdown mode and drive down to 3500 RPM, it will then coast to a stop over a number of hours.

•Loss of external DC supply and loss of backup supply - The Liebert FS can support the magnetic levitation hardware using energy from the flywheel. It will discharge normally until 25000 RPM, then change to shutdown mode and drive down to 3500 RPM. At this speed it can no longer support itself, and the unit will turn off. The flywheel will safely drop onto the mechanical touchdown bearings and will slowly come to a stop.

•Loss of external DC supply, loss of backup supply and a fault message appears on the control panel - This unlikely combination of events will cause the flywheel to drop onto the mechanical touchdown bearings without slowing to a safe rotation speed. The ceramic touchdown bearings can withstand very high speeds. However, if the flywheel were to drop onto the ceramic bearings at full speed, the bearings would last only a minute before starting to degrade. Although the system has been designed to retain the rotor as it slows, internal damage will occur during this period. The Liebert FS would require refurbishing at the factory before it could be used again.

Figure 160 Liebert FS connection

DC bus

 

BACKUP AC

 

 

 

POWER SUPPLY

 

 

 

 

Liebert FS

Flywheel module

153

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Emerson Series 600, SERIES 600T user manual Appendix F.4 Scenarios, Liebert FS Flywheel module
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Series 600, SERIES 600T specifications

The Emerson SERIES 600T, as part of the SERIES 600 line, is a sophisticated device designed to meet the demands of industrial automation and control systems. Renowned for its reliability and versatility, the SERIES 600T excels in various applications across multiple sectors, including oil and gas, chemical processing, and power generation.

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