UPSI-1208DPx
Revision 2-0
28
F9 Reverse polarity / Overcurrent / Short circuit
Reverse polarity:
The device has active reverse polarity protection at the input if the input terminal is connected with reverse
polarity while the device is still switched off (e.g. during commissioning). If the device operates in battery mode
and the input terminals are connected with reverse polarity, no reverse polarity protection is given.
Overcurrent:
If the load current at the output is too high, the device switches it off. For maximally allowed current values
and peak current values refer to chapter D „Technical Data”. See for that chapter F12 „Dynamic Powerboost“.
The status LED indicates the error status by means of a very rapid flashing sequence. A restart attempt occurs
every 10 seconds in normal mode. During battery mode there is no restart attempt.
Short circuit:
In the event of a short-circuit at the output of the UPS, the output is immediately disconnected (<5 ms). The
status LED indicates the error status by means of a very rapid flashing sequence. A restart attempt occurs every
second in normal mode (non-latch). During battery mode there is no restart attempt. The impact of a short-
circuit to the device depends on length and diameter (impedance) of the output wiring. In case of a short-circuit
directly at the plugs a damage of the device can occur.
F10 Backup time in battery mode
The nominal backup times can be found within the technical data of this user manual or the user manu-
als / 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 the
UPS. 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 UPS can drop signifi-
cantly below 12 V. This condition should be avoided by shutting down the system in time.
