Commissioning
5.2.1.5.1 Advanced Settings dialog
The following settings are only available in systems without Soft-Power-Off support (S5 state) (e.g. NT4
systems). A PC system with Soft-Power-Off support can switch off the power supply after shutdown. The end
of a session includes a shutdown or restart of the PC, i.e. all settings relating to the end of the session not
only apply to the shutdown, but are retained when the PC is restarted.
Once a mains-operated NT4 system has been shut down, it cannot distinguish between deliberate and non-
deliberate power failure. This means the UPS software and the hardware cannot distinguish between a
genuine power failure and the operator operating the main switch (in order to switch off the system
completely). The UPS merely detects a power failure and switches to battery operation. If the operator has
switched off the main switch, the PC will remain on battery power, eventually draining the battery.
In order to prevent this, the Beckhoff P24Vxxxx UPS features an option to deactivate UPS protection after a
certain delay time. During the delay time, the PC is protected against possible power failure. The PC will
remain on until the external power supply is switched off.
System behavior in the event of a session being ended by the user: The associated settings determine
the system behavior if the end of a session was not initiated by the UPS service, but by the user or the
application (the user may have selected shutdown or restart via the start button).
End of session from battery: These options determine the system behavior if the PC was running on
battery at the time (start of the end of a session).
End of session from mains voltage: These options determine the system behavior if the PC was running
on mains voltage at the time (when the end of a session was initiated).
UPS off and on again if mains voltage OK: If this option is selected, the UPS (and the PC) switches off
once the delay time has elapsed and immediately on again once the external power supply is available again
(power ON after power fail). This is the default behavior for all systems, including systems with Soft-
Power-Off support. The delay time for switching off the UPS has to be configured via the Alarm configuration
dialog [}51]. If this option is selected and the PC is battery-operated, the PCs must not be restarted!
Otherwise the PC may be switched off during the start-up phase!
Delayed UPS protection switch-off (only for systems without Soft-Power-Off support (State S5)): If
this option is selected, UPS protection is deactivated after a configurable delay time, in order to enable the
PC and the UPS to be switched off (e.g. via the main switch). This option is only supported by Beckhoff
P24Vxxxx UPS and UPS firmware version >= 33.1.I. In other models this option is deactivated.
Delay time for switching off UPS protection (s): With shorter times, the PC (and the UPS) can be
switched off more quickly after a shutdown. However, during a restart the PC may not be fully protected
against voltage failure. With longer times and shutdown, it takes longer for the PC (and the UPS) to switch
off. On the other hand, during a restart the PC is protected during the complete start-up phase. During a
restart, UPS protection is activated before the delay time has elapsed, once the UPS service has resumed
communication with the UPS. Default: 360 seconds.
CX2100-09x456 Version: 1.3
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