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14.3 Xtra VFI
14.3.1 Setup mode
In order to set up the Xtra VFI feature correctly,
these two parameters must be known:
• Highest Load Step (HLS)
• Redundancy level
These parameters are explained in the next two
sub-chapters.
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:
HLS in kW 0 kW
The factory default values for HLS are:
HLS in kW
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).
Redundancy level
The redundancy level parameter has to be in-
serted by the user (service menu › settings › Xtra
VFI) and can be adjusted at any time. The redun-
dancy level should correspond to the desired re-
dundancy that the system should have. Typically,
the redundancy level parameter=1, which means
one additional module.
The factory default values redundancy level is
Redundancy level 0 modules
The possible values to insert are
Redundancy level
In case the inserted value exceeds the physical
possibilities of the system (e.g. Redundancy level
=24 when the system capability is only 20 mod-
ules) the UPS system applies the maximum possi-
ble value (in our example it would be 20 modules).
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 menu › settings › Xtra
VFI) and can be disabled at any time.
14 OPERATION PROCEDURES
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