AEG CompuMaster 300 Operating Manual page 25

The last of a.m. faults (battery fault) looks like a discon-
nection of the battery, but it has been detected during
normal operation.
In case of a continuously sounding danger signal after the setting
of the mains switch to position ,,I" and following the UPS self
check, it is possible, that no voltage is available at the mains wall
plug. Please check this device by connecting another load instead
of the UPS (e.g. a light).
Rem.: the initial start up of the UPS without mains available is
not assigned by the manufacturer with respect to suitable
battery protection !
0
0
off the UPS and unplug the mains connector from the wall plug.
Please contact your dealer.
The mains switch must be set to the OFF-position if the
switch still remains in the ON-position without mains
available the battery will be smoothly discharged. This
circumstances can lead to permanent damage if the unit
remains more than two days at this state.
Switching on without
mains available:
Switch off the UPS and
check mains voltage, fre-
the input voltage is within
sounding
the allowed range please
finish all your jobs, switch