Reverse Polarity / Overload / Short Circuit / Overtemperature; Backup Times; Behaviour In Case Of Exceeding Maximum Backup Time - Bicker Elektronik UPSI-IP-1 Series User Manual

UPSI-IP-1 series | UPSI- IP-2 series
12 Reverse polarty / overload / short circuit / overtemperature
The device is protected against reverse polarity at initial operation (device off, not active).
When the device is operating in backup mode, reverse polarity protection not exists. If
the load current is too high (approx. 130-160 % of the nominal value), the device switches
off and continues oper ation automatically as soon as the output current returns to the
specified range or the overload is no longer present. A start attempt is made every second
(non-latch, timer 1s). The impact of a short-circuit to the device depends on the length /
diameter (impedance) of the output wiring.
All UW devices also have over-temperature protection (OTP of the upstream DC / DC
converter). This is activated as soon as the temperature of the sensor rises above a value
operated outside the specification. If this happens, the DC / DC converter switches off the
output (to the UPSI board) and is only activated again when the measured temperature
at the sensor drops below the threshold value.

13 Backup times

The nominal backup times can be found within the according data sheets.
The battery packs show diverse characteristics. An important aspect is the ambient
temperature. At extreme low or high temperatures a reduction of the nominal backup
times can occur (at Li-Ion battery packs in particular).

14 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 storage medium (total discharge protection).
For supercapacitors, which are not sensitive to a deep discharge, a threshold has been
defined which is limited by the current. The lower the voltage, the higher the current on
the capacitors at constant output power.
If more than 70 % of the maximum allowable output current is consumed during
discharge of the supercapacitors, the converter will shut down without immediately
dis connecting the output and a lower voltage will appear at the output (state <2s). This
condition should be avoided by shutting down the system in time before discharging the
supercapacitors under high currents.
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