Modifications reserved
A.2 Setup
In order to setup the Xtra VFI feature correctly, these two parameters are needed to be known:
• Highest Load Step (HLS)
• Redundancy level
These parameters are explained in the next two subchapters.
A.2.1 Highest Load Step
The HLS parameter has to be inserted by your certified service personnel and can be adjusted at any
time; access to the service-menu is required (service menu settings Xtra VFI). HLS should
correspond to the highest load increase (load step) to be expected within the system in less than 50
ms, which the UPS system has to handle without any compromise.
This parameter can be inserted as percentage of the total system capacity or as absolute value in kW
or both (when both parameters are inserted, the system considers the worst case).
The factory default values for HLS are
The possible values to insert are
0 – 3’000 kW (integer, positive)
0 – 100 % (integer, positive)
In case the inserted value exceeds the physical possibilities of the system (e.g. HLS=1’200kW
when the system capability is only 1’000kW) the UPS system applies the maximum possible
value (in our example it would be 1’000kW).
A.2.2 Redundancy level
The redundancy level parameter has to be inserted by the user (service menusettingsXtra VFI)
and can be adjusted at any time. The redundancy level should correspond to the desired redundancy
that the system should have. Typically, the redundancy level parameter=1, which means one
additional module.
The factory default values redundancy level is
The possible values to insert are
0 – 30 modules (integer, positive)
In case the inserted value exceeds the physical possibilities of the system (e.g. Redundancy
level =24 when the system capability is only 20 modules) the UPS system applies the maximum
possible value (in our example it would be 20 modules).
A.2.3 Start Xtra VFI
Once the two above parameters have been defined and set, Xtra VFI can be started simply by
enabling it on the graphical display by your certified service personnel, access to the service-menu is
required (service menusettingsXtra VFI) and can be disabled at any time.
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