PowerWalker VFI 6000T LCD - Manual (Page 26)

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5.2.4 Bypass without output
The LCD display in bypass mode without output is shown in the
following diagram.
Fig. 5-6 Bypass mode without output
5.2.5 HE mode (High Efficiency mode)
It is also called economy mode.
After the UPS is turned on, the power used by the load is supplied
from the mains power via internal filter while the mains power is in
normal range, so the high efficiency could be gained in the HE mode.
Once the mains power is loss or abnormal, the UPS would transfer
to Line mode or Battery mode and the load is supplied continuously.
Fig. 5-7 HE mode
1) The function could be enabled through the LCD setting or the
software (Winpower, etc.).