ABB DPA 250 S4 - 4.2 Xtra-VFI Mode (Enhanced Double Conversion); 4.3 Bypass Mode

28 DPA 250 S4 50-250 KW OPERATING MANUAL
In Xtra-VFI Mode, the UPS system adapts the power capacity according to the partial AC load by put-
ting the unused UPS module in stand-by mode. The remaining UPS modules are operating in double
conversion mode. The UPS system autonomously decides which UPS module goes into stand-by mode.
The system shall rotate/swap the UPS modules between the double conversion mode and the stand-by
mode to extend the operating life and equalize aging.
The status of the UPS Module in Xtra-VFI Mode is displayed as follow:
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4.2 Xtra-VFI Mode
(Enhanced double conversion mode)
LED Indicator Color
Rectifier Green
Bypass Green
Battery Green
Output Blue
Breaker Status
MBS (Q1) Open
UPS Output switch (Q2) Closed
—
4.2-1
—
4.2.1: “Standby Mode”
control panel mimic
In Bypass Mode, the load is supplied from the bypass mains (L2) through the static bypass . The
Inverter is OFF.
—
4.3 Bypass Mode
—
4.3.1: “OFF LINE”
operating mode
—
4.3-1
In the Bypass Mode the battery charger remains active. In the event of a bypass mains (Line 2) failure,
the load will automatically be transferred from the mains to the inverter within 5 ms (this is valid for
single and parallel systems). If the Utility Mains supply (LINE 1) is not available, the energy is supplied by
the battery.