Modifications reserved
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OPM_LPS_33E_60K_M12_2GB_V010.doc
Operating Manual
LP 33 Series 60-80-100-120 kVA / S2
4.2 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. 4.2-1 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
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. 4.2-2 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 7.4 – ECO
Mode)
.
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.