Vertiv GXT4-10000RT230, Installer/User Manual

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2.7 Major Components
The UPS is composed of mains input, TVSS and EMI/RFI filters, rectifier/PFC, inverter, battery charger, DC-
to-DC converter, battery, dynamic bypass and UPS output.
Figure 2.7 Operating principle diagram
2.7.1 Transient Voltage Surge Suppression (TVSS) and EMI/RFI Filters
The UPS has surge protection and filters that protect the connected load from power surges,
electromagnetic interference (EMI) and radio frequency interference (RFI). These features can minimize
any surges or interference present in the mains power. The filters also prevent surges or interference
generated by the UPS from adversely affecting devices connected on the same branch as the UPS.
2.7.2 Rectifier/Power Factor Correction (PFC) Circuit
In normal operation, the rectifier/PFC circuit converts mains power to regulated DC power for use by the
inverter while ensuring that the wave shape of the input current used by the UPS is near ideal. Extracting
this sine-wave input current achieves two objectives:
• Efficient power use by the UPS
• Reduced reflected harmonics
This results in cleaner power available to other devices in the building that are not protected by the
GXT4.
2.7.3 Inverter
In normal operation, the inverter utilizes the DC output of the PFC circuit to produce precise, regulated
sine-wave AC power. When mains power fails, the inverter receives DC power from the DC-to-DC
Converter. In either operation mode, the UPS inverter is online, continuously generating clean, precise,
regulated AC output power.
2.7.4 Battery Charger
The battery charger utilizes energy from the mains power and precisely regulates it to continuously float
charge the batteries. The batteries are being charged whenever the GXT4 is plugged in, even when the
UPS is not turned On.
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