This document will explain the various LED's on your 3rd or 4th generation Smart-UPS.
Models beginning with SU, SUA, or SUM, All Serial Numbers
The LED display on your Smart-UPS indicates the current operational mode of your UPS.
The front panel of the Smart-UPS is comprised of an On/Test button, an Off button, and several visual indicator lights (LEDs). The LEDs indicate the current operating status of the UPS. These LEDs are described below:
On-Line: The online LED illuminates when the UPS is supplying utility power to the connected equipment. If the LED is not lit, the UPS is either not turned ON, or is supplying battery power.
AVR Trim: This LED illuminates to indicate the UPS is compensating for a high utility voltage. While the UPS can run in this mode indefinitely without any negative impact on the UPS, the circuit should be checked by a qualified electrician if the utility voltage is consistently high.
AVR Boost: This LED illuminates to indicate the UPS is compensating for a low utility voltage. While the UPS can run in this mode indefinitely without any negative impact on the UPS, the circuit should be checked by a qualified electrician if the utility voltage is consistently low.
On Battery: This LED illuminates to indicate the UPS is supplying battery power to the connected equipment.
Overload: This LED illuminates to indicate the equipment plugged into the UPS exceeds the total capacity of the UPS. Some of the equipment (the load) on the UPS should be removed or turned off.
Replace Battery: This LED will illuminate when the battery in the UPS has failed the most recent battery self-test.
Load: These 5 LEDs represent the percentage of the UPSs capacity that the load is using. Each LED represents approximately 16-17% capacity. For example, if 4 LEDs are lit, approximately 67% of the UPS capacity is being used by the load.
Battery Charge: These 5 LEDs show the approximate charge of the battery in a percent. Each LED represents approximately a 20% charge on the battery.
Some of the above LEDs are also accompanied by an audible alarm.