Tripp Lite SMART1050SLTAA Owner's Manual page 6

Basic Operation
Indicator Lights
All Indicator Light descriptions apply when the UPS is plugged into a wall outlet and
turned ON.
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"POWER" LED: this green LED lights continuously when the UPS is ON
and supplying connected equipment with AC power from a utility source.
The LED flashes and an alarm sounds (4 short beeps followed by a
pause) to indicate the UPS is operating from its internal batteries during
a blackout or severe brownout. If the blackout or severe brownout is
prolonged, you should save files and shut down your equipment since
internal battery power will eventually be depleted. See "BATTERY
CHARGE" LED description below.
"VOLTAGE CORRECTION" LED: this green LED lights continuously
whenever the UPS is automatically correcting high or low AC voltage on
the utility line without the assistance of battery power. The UPS will also
emit a slight clicking noise. These are normal, automatic operations of
the UPS, no action is required on your part.
"OUTPUT LOAD LEVEL" LEDs: These multicolored LEDs indicate the
approximate electrical load of equipment connected to the UPS's AC
outlets: green (light load), yellow (medium load) and red (overload). If
the red LED is either illuminated continuously or flashing, clear the
overload immediately by unplugging some of your equipment from the
outlets until the yellow or green LED illuminates. CAUTION! Any overload
that is not corrected by the user immediately may cause the UPS to
shut down and cease supplying output power in the event of a blackout
or severe brownout.
"BATTERY CHARGE" LEDs: When the UPS is operating from utility
power, these LEDs indicates the approximate charge state of the UPS's
internal batteries: red indicates the batteries are beginning to charge;
yellow indicates the batteries are roughly midway through charging; and
green indicates the batteries are fully charged. When the UPS is
operating from battery power during a blackout or severe brownout,
these multicolor LEDs indicate the approximate amount of energy
(ultimately affecting runtime) that the UPS's batteries will provide: red
indicates a low level of energy; yellow indicates a medium level of
energy; and green indicates a high level of energy. Since the runtime
performance of all UPS batteries will gradually deplete over time, it is
recommended that you periodically perform a self-test (see "MUTE/TEST"
Button description) to determine the energy level of your UPS batteries
BEFORE a blackout or severe brownout occurs. During a prolonged
blackout or severe brownout, you should save files and shut down your
equipment since battery power will eventually be depleted. When the red
LED illuminates and an alarm sounds continuously, this indicates that
the UPS's batteries are nearly out of power and UPS shutdown is
imminent.
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