Beckhoff CU8110-0120, Manual

Page: 28 / 57

Configuration
CU8130-0120 28 Version: 1.0
Short power failures during operation (tBatt <tCA)
The UPS service has been started and is active. Short power failures are bridged by the UPS. A shutdown
through the UPS service is not initiated.
Power failure during the boot process
The UPS service is not yet active at this time. The UPS automatically switches to battery operation, thus
bridging the power failure. The PC is booted up in battery mode. During a prolonged power failure, the UPS
service takes over control after the start and starts shutting down the system.
Restoration of supply and repeated power failures during UPS shutdown
The following diagram shows a case in which the UPS service initiates a shutdown and the supply is
restored during the shutdown.
Once the UPS service has initiated the shutdown this process cannot be stopped and must be completed.
Repeated power failures during the shutdown are bridged by the UPS. In order to enable the IPC to restart
the external power supply is interrupted briefly (a few seconds).
Value Description Properties
tBatt Time during which the system is operated via
the battery. Variable, depending on the duration of the power
failure.
If tBatt >=tCA the UPS service irrevocably starts
shutting down the system.
tCA Maximum time on battery voltage before critical
alarm. Once this time has elapsed the UPS
service irrevocably starts shutting down the
system. Configurable in minutes (or in seconds starting
from Windows 7 and higher) via the Beckhoff
UPS configuration dialog.
If tCA = 0 the UPS service immediately starts
shutting down the system.