7th4 Overload behavior
While operating in normal or battery mode, the UPS can feed overloads for a limited duration which is
given in the “technical specifications” section. After that duration, UPS automatically switches into bypass
mode, if the bypass is enabled and frequency/waveform/rms value of the bypass mains voltage is
acceptable.If the overload situation continues in the bypass operation, thermal/magnetic protection
devices may activate and protect the circuit. In this case, all loads on the output will be deenergized.
Make sure that the UPS is not overloaded to provide a higher quality supply to the loads.
7th5 Electronic short circuit protection
The UPS attempts to force the thermal/magnetic protection devices between the output terminals and the
short circuited load to open, by supplying current to the short circuited load for a limited duration. The
UPS shall be working in battery or normal mode, for this feature to work.
To enable the short circuit protection feature of the UPS, each load shall be fed over a separate
circuit breaker chosen according to the load current. This may provide quick disconnection of the
short circuited load and operation continuity of the other loads. To obtain maximum protection,
the rating of each individual load circuit breaker shall have the minimum value, which is enough
to carry the full load current continuously.
If the protection device fails to open the circuit in a limited time, the UPS stops feeding current to the
output. “VSECFLR” message is shown on the upper left of the LCD.
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