OPERATION
SYSTEM OVERVIEW
This Line-Interactive UPS protects computers, AV servers, telecom systems,
security systems, and a variety of electronic equipment from blackouts, brown-
outs, over voltages, and surges. The Automatic Voltage Regulation (AVR)
continuously corrects the voltages in between the brownout and over voltage
transfer points (90 - 150VAC). When the UPS is operating in the AVR mode
the audible alarm will remain silent and the AC mode indicator will blink. Dur-
ing normal AC operation, the UPS will quietly and consistently protect con-
nected electronic equipment from power anomalies.
The UPS will charge the batteries when it is plugged into the wall outlet and
there is an acceptable AC voltage present (90 - 150VAC) - whether the UPS is
ON or OFF. When a blackout, brownout, or an over voltage condition occurs
the UPS will transfer to the battery mode, the “On Battery” light will illuminate
and the audible alarm will sound once every ten seconds indicating that the
utility power is lost or unacceptable. When utility power returns or is at an ac-
ceptable level the UPS will automatically switch back to the AC mode and start
recharging the batteries. During an extended outage when there is approxi-
mately two minutes of backup time remaining the audible alarm will sound
twice every five seconds. At that time, all open data files should be saved and
computers and power electronic equipment should be turned off. When the
batteries reach the predetermined level the UPS will automatically shutdown
protecting the batteries from over discharging. Once utility power returns and
is at an acceptable level the UPS will restart and begin charging the batteries.
Block Diagram of the Basic Wiring and Internal Circuit Configuration
