APC 1000XL - UPS Operation Basics; Smart-UPS Front Panel Controls and LEDs

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2: OPERATION
SMART-UPS FRONT PANEL
Power On
Power Off
Load Battery Charge
Online
The online LED illuminates when the UPS is supplying utility power to the con-
nected equipment. If the LED is not lit, the UPS is either not turned ON, or is sup-
plying battery power.
AVR Trim
This LED illuminates to indicate the UPS is compensating for a high utility voltage.