Tripp Lite SMART1500SLT Owner's Manual for SmartPro SLT UPS 932442 - Page 6

Basic Operation continued Indicator Lights All Indicator Light descriptions apply when the UPS is plugged into a wall outlet and turned ON. "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. 6 12-11-101 93-2442.indb 6 12/4/2012 10:52:42 AM