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System Overview
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5.1.1 System Module Description
The Liebert FS is a modular system composed as follows:
• Control Panel
• UPS Interconnection Kit
• Power Conversion Module
• Main Control Module
• Flywheel Module
• E-Stop (optional-special order)
Components are illustrated in Figure 35.
Control Panel
The Liebert FS uses a control panel as the primary means for an operator to interface with the sys-
tem.
UPS Interconnection Kit
The UPS Interconnection Kit is a module that enables the physical interconnection of the Liebert FS
and a UPS system. There are several versions that vary, depending on the UPS model.
The Liebert FS is delivered with a UPS interconnection kit consisting of a circuit breaker for connec-
tion of the positive and negative terminals coming from the UPS DC bus or from an external discon-
nect switch.
Power Conversion Module
The power conversion module is a bi-directional power electronics-based power converter capable of
sourcing or sinking power to and from the UPS DC bus.
While performing the Liebert FS’s backup power mission, the power conversion module converts
“variable frequency - variable voltage” AC power from the Liebert FS’ motor-generator and delivers
regulated DC voltage output to the UPS DC bus.
Conversely, for the Liebert FS’s needs in charging power, the power conversion module converts DC
power from the UPS DC bus into “variable frequency - variable voltage” AC power for the Liebert FS’
motor-generator.
Main Control Module
The Main Control Module provides the overall control of the Liebert FS as well as the specific control
for:
• Motor-generator
• Active magnetic levitation hardware
Flywheel Module
The Flywheel Module houses several major components:
• Motor-generator—synchronous reluctance technology
• Rotating group—high-speed carbon composite flywheel, high-speed shaft and rotor of the motor-
generator
• 5-axis active magnetic levitation hardware
• Molecular vacuum pump
E-Stop
The E-Stop is an Emergency Stop that allows the Liebert FS to disconnect from the UPS. The E-Stop
is a CE requirement for systems shipping to Europe (and other areas requiring the CE Mark). The
feature is available elsewhere as an option. Two choices are available for how the E-Stop is powered,
internally or externally. If E-Stop is activated, Liebert FS will enter a self-discharge and shutdown
mode.
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