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Operating status
The UPS may be in a different status for each operating mode explained above. The following is a list of possible
operating states.
Normal
When the UPS operates "normally" in the selected Operating Mode without any alarm. In this condition the selected
"Operating Mode" is displayed in light blue.
Stand-by with battery charger off
This is the default status when the UPS is supplied. The UPS is powered but the system is in idle status (no power
stages are active).
Stand-by with battery charger on
When the UPS is supplied, the user can turn on the battery charger without turning on the whole UPS. In this
condition the load is not supplied.
Battery working
When the UPS is supplying the output with the batteries present, if the mains power supply falls outside the pre-set
tolerances, for example in case of a blackout, voltage or frequency disturbance, the system automatically switches
to BATTERY OPERATING STATUS and draws power from the batteries to support the load.
Once the mains power supply is again clean and stable, the system automatically returns back to the pre-set
operational mode.
Temporary bypass
During this operational state, the load is directly powered by the incoming mains supply, therefore, any input
disturbances will directly affect the connected load.
Manual bypass
The manual bypass enables the user to physically connect the UPS input directly to the output. This condition is
required to perform maintenance operations on the UPS without the need to disconnect the power from the
protected load.
Before closing the manual bypass switch, an auxiliary contact informs the UPS that the load is going to be
transferred to manual bypass. This activates an immediate, synchronised transition to the internal static bypass to
ensure a safe closure of the manual bypass power contacts.
WARNING: Maintenance work inside the UPS is to be performed exclusively by qualified staff. There
may be voltages present within the UPS even when the input, output and battery fuse holders are
open. Removal of the UPS panels by non-qualified staff may result in injury to the operator and
damage the equipment.
For further instructions in relation to the manual bypass function, please refer to the “Switching the system to manual
bypass” chapter.
