ABB DPA 250 S4 - 4 Operating Modes; 4.1 Double Conversion Mode

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4 Operating modes
In double the conversion mode, the load is connected to the UPS Inverter (INV) and the Rectifier is sup-
plied by the main utility supply (L1). The battery remains charged or is under charged. The double con-
version mode protect the load from any utility main disturbance or failure.
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4.1 Double conversion mode
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4.1-1
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4.1-1: “Double conver-
sion” operating mode
When the UPS system is in a double conversion mode, the status of UPS module control panel is dis-
played as follow:
LED Indicator Color
Rectifier Green
Bypass Green
Battery Green
Output Green
Breaker Status
MBS (Q1) Open
UPS Output switch (Q2) Closed
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4.1-2
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4.1-2: “Inverter Mode”
control panel mimic
In the unlikely event of an inverter fault or overload condition the UPS will transfer the load - automati-
cally and without interruption to the static bypass (transfer time = 0).
4 OPERATING MODES