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UPSI-1208(D) | UPSI-2406(D)
13 Charging time
Charging times depend on storage medium, input voltage and the load current.
14 Reverse polarity / overload / short circuit
The device is protected against reverse polarity at initial operation (device off, not active).
When the device is running in battery start mode or 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. In case of a short-circuit directly at the plugs, a damage of the device can occur.
15 Backup times
The UPS is combinable with different storage media. 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 backup times can
occur.
16 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
definded 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.
