UPSI-1208D
Revision 1
26
F10 Backup time in battery mode
The nominal backup times can be found within the user manuals or the datasheets of the used energy
storages. At extreme low or high temperatures a reduction of the nominal backup times can occur.
F11 Behaviour in case of exceeding maximum backup time
When the given buffering times are exceeded, the output is separated on the basis of the discharge voltage of
the corresponding energy storage (total discharge protection).
With supercapacitors in particular, an additional switch-off threshold can take effect if the discharge current of
the energy storage device is too high (>15 A). This can occur at very high load currents at the output of UPSI-
1208D. The lower the voltage of the energy storage device decreases, the higher the discharge current so that
a constant power is ensured at the output of the UPS.
If the allowable output current during battery mode exceeds more than 70 %, the converter switches off first,
without separating the output immediately. In this case, the voltage at the output of the UPSI-1208D can drop
significantly below 12 V. This condition should be avoided by shutting down the system in time.
