Operation
The Powerware 9150 can operate in Normal, Bypass, or Battery Mode. The UPS automatically switches between these modes as required, and the UPS front panel indicates the current mode of operation.
Normal ModeWhen the UPS is in Normal Mode, the UPS ON and LINE ON indicators illuminate. The LOAD indicator(s) display percentage of UPS load capacity being used by the protected equipment.
Bypass ModeThe UPS switches to Bypass Mode in the event of an overload condition, overtemp condition, or UPS failure. When the unit switches to Bypass, a monotone alarm sounds and the BYPASSED indicator illuminates, indicating that the load is powered by utility power. However, utility power continues to be passively filtered by the UPS.
Battery ModeBattery Mode is automatically initiated if a utility failure occurs or if utility power does not meet preset parameters. The UPS switches to battery (DC) power, providing power to support the load.
When the unit switches to Battery Mode, an alarm beeps for five seconds and the ON BATTERY indicator illuminates, indicating a power outage. The UPS remains in Battery Mode until the utility power returns or until the battery can no longer support the inverter operation.
When the battery can no longer support inverter operation, an audible alarm indicates that approximately five minutes of backup time remains. The time remaining is variable and depends upon battery capacity and loading on the unit. If a power failure outlasts the backup time, the UPS shuts down in order to prevent a total discharge of the battery. When utility is restored, the UPS starts automatically, providing power to the critical load and charging the battery bank.
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