3.2OPERATION 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-chargerkeeps 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

Fig. 3.2-2 Energy flow in ECO Mode operation

defined by the control unit.

 

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.

 

 

Modifications reserved

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OPM_LPS_3UO_30K_40K_0US_V010.doc

Operating Manual LP 33 Series 30 & 40 kVA

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GE LP 33 manual Operation Modes, VFI Voltage Frequency Independent Mode operation, Through the automatic bypass

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