Liebert PSITM - Manual (Page 10)

Major Components
6
3.0 M
AJOR
C
OMPONENTS
Figure 4 Line diagram of PowerSure PSI 1000VA & 1440VA
Figure 5 Line diagram of PowerSure PSI 2200VA & 3000VA
3.1 Transient Voltage Surge Suppression (TVSS) and EMI/RFI Filters
These UPS components provide surge protection and filter both electromagnetic interference (EMI)
and radio frequency interference (RFI). They minimize surges or interference present in the mains
line and keep the sensitive equipment protected.
3.2 Relay
In Normal mode the Relay passes mains AC power to the connected load. When input mains voltage
or frequency is outside acceptable limits, the Relay activates and transfers the UPS to battery.
Input
EMI/RFI
Filter
Relay
AVR
Transformer
Output
Inverter Battery Charger
G G
Input
EMI/RFI
Filter
Relay
AVR
Transformer
Output
Bi-Directional
Converter
Battery Charger
DC-to-DC
Converter
G G