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If the protection device fails to open the circuit in a limited time, the UPS stops feeding current to the output
Overload Behaviour
While operating in normal (online) or battery mode, the UPS can feed overloads for a limited duration which
is given in the
Appendix-1 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, UPS can feed overloads for a
limited duration which is given in the
Appendix-1 Technical Specifications
thermal/magnetic protection devices may activate and protect the circuit. In this case, all loads on the
output will be deenergized.
5.3. Battery Operation
Energy is drawn from the batteries. Loads are fed via the inverter.
Output voltage is sinusoidal and has a regulated amplitude and frequency. It is independent from the battery
voltage.
Battery voltage shall be in acceptable limits and the inverter shall be enabled for the UPS to operate in this
mode.
When the upper provisions are met, the UPS works in battery mode in the following conditions:
•
If rectifier is disabled.
•
If the rectifier is disabled or frequency/waveform/rms value of mains voltage is not in acceptable limits.
Battery Test
This feature enables the user to obtain information about the battery condition. If the batteries have
approached end of their lives, batteries fail.
Battery life depends on several parameters like the number of charge-discharge cycles, discharge depth and
ambient temperature. Battery life greatly decreases as the ambient temperature increases. Therefore it is
recommended to keep the ambient temperature about 20°C.
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.
Make sure that the UPS is not overloaded to provide a higher quality supply to the loads.
