OPM_LPS_33E_10K_30K_4CN_V010.doc 12/82 Operating Manual LP 33 / 10-20-30 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.
On-line 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 On-line 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.
IEM mode operation (Intelligent Energy Management)
When the IEM 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 IEM mode operation
The IEM 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 “On-line mode and IEM mode”, or switching
between operation modes at required time, can be done through the UPS console panel (see
Section 7.3.1-5).
In case of parallel system
IEM mode (Intelligent Energy Management) cannot be enabled for RPA Parallel System.
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