Modifications reserved Page 11/57
OPM_LPS_3UO_50K_60K_0US_V010.doc Operating Manual LP 33 Series 50 & 60 kVA
3.2 OPERATION MODES
This section describes the different possible operation modes of the UPS explaining the function of the
main modules of the UPS.
VFI (Voltage Frequency Independent) Mode operation
Under normal conditions the load is
permanently powered by the inverter with
constant amplitude and frequency.
The rectifier, powered by the mains, supplies the
inverter and the battery-charger keeps the
battery fully charged.
Fig. 3.2-1 Energy flow in VFI Mode operation
The inverter converts the DC voltage in a new AC sine wave voltage with constant amplitude and
frequency independently from the input mains power.
ECO Mode operation (Intelligent Energy Management)
When the ECO Mode is selected, and the mains
power is available, the load is normally powered
through the automatic bypass.
When the mains voltage is detected out of the
prescribed tolerances, the load is automatically
transferred to the inverter.
When the mains recovers, the load returns to
the automatic bypass after a variable time
defined by the control unit.
Fig. 3.2-2 Energy flow in ECO Mode operation
The ECO Mode can be configured directly by the user for higher efficiency, considering the mains
reliability and criticality of the load.
The selection between the two operation modes “VFI Mode and ECO Mode”, or switching between
operation modes at required time, can be done through the UPS control panel (see Section 6.3.1-5).
In case of parallel system
ECO Mode cannot be enabled for RPA Parallel System.
Attention: A single unit equipped with a RPA - Parallel board, must be considered as parallel, thus
disabling ECO Mode.
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