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Explanation UPS


The standard EN 50091-3 shows the main operating functions of the UPS. The basic function of a UPS is to provide a connected load interruption. This can be achieved with different circuit architectures, and corresponding modes of operation.

An overview of the system disturbances occurring and the appropriate UPS solutions according to the three classifications UPS VFD, VI and VFI are in the table below.

The UPS solution VFD can be used for all 10 grid disturbances in the grid faults 1 to 3, VI at No. 1 to 5 and VFI.

Table System disturbances and UPS solutions

VFI (On-Line) UPS

The new classification of European standard EN 50091-3 (IEC 62040-3)
VFI V oltage and F requency I ndependent (On-Line)

Electricity supply ok

Stromversorgung Online OK

Power failure

Stromversorgung Online Ausfall

Overload

Funktionsbild Online Überlast
legends

VI (Line-Interaktive) UPS

The new classification of European standard EN 50091-3 (IEC 62040-3)
VI V oltage I ndependent (Line-Interactive)

Electricity supply ok

Stromversorgung VI OK

Power failure

Power failure VI
legends

VFD (Off-Line) UPS

The new classification of European standard EN 50091-3 (IEC 62040-3)
VFD V oltage and F requency D ependent (Off-Line)

Electricity supply ok

Stromversorgung Online VFD OK

Power failure

Power failure VI
legends

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