04-3275_OPM_ABB_CONCEPTPOWER_DPA_500kW_EN_REV-A.docx Page 43/78 ABB
Modifications reserved
6.4.8 Operating mode
6.4.8.1 Online mode (Inverter mode)
The Online mode is the UPS operating mode in which the load is supplied through the rectifier and the inverter.
Figure 21: Online mode on Mimic Diagram
The Online mode provides the highest degree of protection, especially in the event of a mains disturbance or failure.
This operating mode is always recommended if the critical loads will not tolerate any interruption of the supply (not
even the shortest).
In the unlikely event of an inverter fault or overload condition the UPS will transfer the load automatically and
without interruption to the static bypass-mains supply (transfer time = 0ms).
6.4.8.2 Eco mode (Offline or bypass mode)
In Eco mode, the load is supplied from the mains through the static bypass.
Figure 22: Eco mode on Mimic Diagram
When the UPS is operating in Eco mode, the efficiency of the system is higher (99%). In the event of a mains failure
the load will automatically be transferred from mains to inverter within 5 ms (this is valid for single and parallel
systems). The battery charger remains active in Eco mode.
Operating in Eco mode is recommended only if the load can tolerate interruptions of 3-5 ms (transfer time from Eco
mode to Online mode).
NOTE!
TO HAVE THE MOST ESSENTIAL SECURITY LEVEL, WE RECOMMEND TO RUN
THE UPS ON ONLINE OPERATION MODE.
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