APC UPS operating modes

StatusDescriptionSeverity
On LineEstimated Runtime
The UPS is connected to utility power, the battery is charging, and the UPS is operating normally. The estimated runtime is the number of minutes the connected devices (load) can be supported by the UPS battery in the event of a power outage.
Not Applicable
Device Health Critical
A critical health event is occurring.
Not Applicable
On BatteryEstimated Runtime
Input utility power is interrupted, and the UPS is supporting its load on battery. The estimated runtime is the number of minutes the load can be supported by the UPS on battery.
Warning
Runtime Calibration Initiated
The UPS is performing a battery calibration to determine an accurate reading of battery runtime available. The calibration is initiated from PowerChute Business Edition, or via the UPS LCD.
Informational
Low BatteryEstimated Runtime
The UPS operating on battery has reached the Low Battery Threshold, which is configured via the UPS LCD or via PowerChute Business Edition or Network Shutdown. If the UPS runtime remaining falls below the Low Battery threshold, and if input power is not restored to the UPS, it will shut down when the battery has exhausted.
Critical
BypassUPS Initiated Bypass
The UPS is reporting an internal hardware issue that has caused the UPS to switch to bypass operation.
Critical
User Initiated Bypass
A user has placed the UPS into bypass mode, which allows maintenance to be performed without turning off utility power to the UPS. NOTE: This option is not available for all UPS models.
Warning
UPS OffOutput Power Turned Off
The UPS output is turned off, and is no longer supporting any connected devices.
Informational

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