Emerson GXT2U - Manual (Page 9)

5
M
AJOR
C
OMPONENTS
Transient Voltage Surge Suppression and EMI/RFI Filters
These UPS components provide surge protection and filter both
electromagnetic interference (EMI) and radio frequency interference (RFI).
They minimize any surges or interference present in the utility line and keep
the sensitive equipment protected.
Rectifier/Power Factor Correction (PFC) Circuit
In normal operation, the rectifier/power factor correction (PFC) circuit
converts utility AC power to regulated DC power for use by the inverter while
ensuring that the waveshape of the input current used by the UPS is near
ideal. Extracting this sinewave input current achieves two objectives:
• The utility power is used as efficiently as possible by the UPS.
• The amount of distortion reflected on the utility is reduced.
This results in cleaner power being available to other devices in the building
not being protected by the Liebert GXT2U.
Inverter
In normal operation, the inverter utilizes the DC output of the power factor
correction circuit and inverts it into precise, regulated sinewave AC power.
Upon a utility power failure, the inverter receives its required energy from the
battery through the DC to DC converter. In both modes of operation, the UPS
inverter is on-line and continuously generating clean, precise, regulated AC
output power.
Battery Charger
The battery charger utilizes energy from the utility power and precisely
regulates it to continuously “float charge” the batteries. The batteries are
being charged whenever the Liebert GXT2U is plugged in, even when the UPS
is not turned on.
Input Output
Inverter
Battery
Battery
Charger
DC to DC
Converter
Rectifier
/PFC
TVSS &
EMI/RFI
Filters
L1
L2
G
L1
L2
G
Dynamic
Bypass