Modes Of Operation; Normal Mode; Buck/Boost Mode - Liebert PowerSure PSA User Manual

M
ODES OF

Normal Mode

During Normal mode operation, the PowerSure PSA supplies condi-
tioned, computer-grade power to the connected equipment: utility
power passes through the TVSS circuitry and the EMI/RFI filters and
then through the Bi-Directional Converter to connected equipment.
When the UPS is in Normal mode, the Utility Indicator illuminates
green.
The PowerSure PSA continuously monitors the batteries to maintain
them in a fully charged state. The battery charger operates whenever
AC power is present, even if the UPS is switched off. By default, the
UPS is set to perform an automatic battery test after it has been oper-
ating continuously for two (2) weeks. The interval at which the UPS
will perform a battery test can be configured via MultiLink.

Buck/Boost Mode

The Automatic Voltage Regulator (AVR) circuitry compensates for
fluctuations in utility power, such as voltage surges and sags. When
the PowerSure PSA detects an abnormality, it raises the undervoltage
(boost) or lowers the overvoltage (buck) as needed. The AVR operates
automatically and maintains the output voltage to the connected criti-
cal equipment, without utilizing the batteries.
When the UPS is in Buck/Boost mode, the Utility Indicator illumi-
nates amber.
O
PERATION
Utility Indicator (Green)
Utility Indicator (Amber)
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