ABB Conceptpower DPA 500 - Introduction; Description; Working Principle; System Conditions

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A.1 Introduction
A.1.1 Description
Xtra VFI is a complementary operating mode of the UPS, which allows to save energy while maintaining
the highest level of protection to the critical load (double-conversion). When enabled, the Xtra VFI mode
turns into standby mode a certain number of UPS modules in order to maximize the efficiency of the
system.
Example of Conceptpower DPA 500 system with 10 x 100kW UPS modules = 1MW total capacity
running with N+1 redundant configuration. The potential for energy efficiency saving, as indicated in the
Figure 30, can be up to 4-5% efficiency points, which correspond to several
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Watts.
Figure 30: Efficiency diagram with and without Xtra VFI.
A.1.1.1 Working principle
Xtra VFI can be enabled or disabled at any time by your certified service personnel (access to the
service-menu is required).
In addition to be enabled, the following conditions have to be respected for having Xtra VFI mode active;
when one of the condition is not anymore respected, the Xtra VFI mode gets disabled automatically.
A.1.1.2 System conditions
System conditions for Xtra VFI to be active:
• There isn’t any active alarm within the system
• All UPS modules within the system are turned ON (load-ON)
• Quantity of UPS modules in the system is equal to the “Total UPS Number”. The parameter
“Total UPS Number”, has inserted by the service personnel before Xtra VFI gets enabled (access
to the service-menu is required).
• All UPS modules have the IA2 switch CLOSED (IA2 is the module-dedicated output switch on
front of the cabinet)
• No battery test is active
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The real power saved varies depending on the system conditions. May vary continuously.