1.4 UPS Operation
The UPS is designed for easy operation. Once the UPS is plugged into the wall outlet, it begins to charge
the battery whether the UPS has been turned on or not.
To turn on the UPS, press and hold the ON/OFF button until the unit beeps, then release the button.
To turn off the UPS, press and hold the ON/OFF button for at least 1 second then release the button. To
completely stop all UPS operation, once the UPS is turned off, unplug the input cord from the wall outlet.
During normal operation, the UPS protects the connected equipment from utility abnormalities, such as
brownout/sags, over-voltage/surges, and complete outages. During utility sags and surges, the UPS AVR
circuits will either Boost or Buck the input voltage to correct the voltage for the connected equipment
that is plugged into the battery-backed outlets. During utility outages the UPS automatically draws power
from the battery to support the connected equipment that is plugged into the battery-backed outlets.
Note that equipment plugged into the surge-only outlets shut down in these conditions. If the utility
power problems are long-term, the UPS will eventually shut down because all battery power is exhausted.
Once utility power is restored to normal operating parameters for the UPS, it automatically restarts and
begins to power the connected equipment and to recharge the battery for the next utility abnormality.
1.5 Alarms
1.5.1 On Battery
When the UPS is operating on the batteries, the On Battery LED illuminates and the audible alarm sounds
once every 5 seconds. The alarm stops once the UPS returns to the AC normal mode.
1.5.2 Low Battery Warning
The UPS sounds 2 beeps every 5 seconds and the On Battery LED blinks on/off when the battery reserve
runs low. This condition continues until AC returns or the UPS shuts down from battery exhaustion.
1.5.3 Weak/Bad Battery
The UPS automatically tests the battery's condition and, if the battery fails the test because of weak
capacity, bad battery, or battery disconnected:
• The Fault LED flashes on/off
• The Battery Capacity bar graph may show no segments.
• The alarm beeps 3 times every 30 seconds until the battery is reconnected or replaced.
We recommend that the UPS charge overnight before performing a battery test to confirm a Weak/Bad
Battery condition.
1.5.4 Overload
When the amount of equipment connected to the UPS exceeds its power rating, the the Load Capacity
bar graph is “full,” the Fault LED flashes on/off, and the UPS sounds 1 beep every half second (AC and
Battery modes). The alarm remains on until the excess load is removed or the UPS's self-protection circuit
shuts down the UPS.
Vertiv | Liebert® PSA4™ Installer/User Guide | 8
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