Xtra VFI operating mode

Xtra VFI mode is a smart way to minimize losses and improve efficiency safely when running in double conversion mode.

When Xtra VFI mode is enabled, the UPS automatically adjusts the number of active modules according to the load power requirements. Modules that are not needed are switched to a standby state of readiness, primed to kick in and transfer to active mode if the load increases. The efficiency improvements achieved by this mode of operation are especially significant when the load is less than 25 percent of full UPS system capacity.

Maximum UPS efficiency in all loading conditions, Xtra VFI

watch the 3.30 minutes video here

The figure shows how the Xtra VFI operating mode can enhance efficiency when running at a low load level for a Conceptpower DPA 500 modular UPS system with 10 UPS modules (100 kW) and total available capacity of 1 MW.

Key features

Reliability and efficiency without compromises

UPS standard modes and Xtra modes

Conceptpower DPA 500 in Xtra VFI operating mode

Control and metering via graphical interface

Enhanced double conversion efficiency

To maximize efficiency, the UPS active capacity is automatically scaled according to the load power
The system calculates the optimal load percentage for maximal efficiency, taking into account desired redundancy level selection and other set parameters

Performance adjusted according to application requirements

The redundancy level for active capacity and highest expected load step can be configured by the user
to optimize the performance in a particular application

Fault tolerant and sustainable

Hysteresis prevents the modules from switching on/off when operating close to the threshold
In case of mains failure or other abnormal situations, all modules revert to active mode
The system rotates the modules between active and standby modes at fixed intervals to extend service life and equalize aging

Example Conceptpower DPA 500 in Xtra VFI operating mode (2× 500 kW frames)
System total capacity: 1000 kW
Specified redundancy: N + 2
Load power: 200 kW
No of active modules: 4 pcs
UPS active capacity: 400 kW

Xtra VFI has an interface that allows the user to set up operating parameters to suit the particular application.

Customer-configurable parameters include:

How many redundant modules should be active at any time
The highest expected load step (in kW or %). This allows the system to further optimize the UPS performance and efficiency

The system calculates and displays Xtra VFI energy savings, etc. compared to normal operation:

Instantaneous power (kW) currently being saved by the Xtra VFI mode
The cumulative energy (kWh) saved from the day Xtra VFI mode was first enabled
The number of modules in active mode and on standby
A Xtra VFI preview in the display menu can be used to simulate how much power would be saved with different Xtra VFI setups

Display showing UPS-settings and measures in Xtra VFI operating mode (number of modules in active mode and on standby)

Downloads and links

Xtra VFI press release

Xtra VFI flyer

Xtra VFI presentation

Xtra VFI movie

watch the 3.30 minutes video here

ABB's modular UPS design

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