PowerWalker Battery Pack for VFI 1000RT LCD - Manual (Page 30)

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The UPS does not have the backup function when it is in bypass mode.
The power used by the load is supplied from the utility power via internal
filter.
6.4 NO output mode
The LCD display in No output mode is shown in the following diagram.
The information about the utility power, the battery level, the UPS output
and the load level could be displayed. The “STbY” string indicates the
UPS is working in the No output mode.
■ ■ ■ ■
The No output mode
6.5 EPO (Emergency Power Off)
It is also called RPO (Remote Power Off). On LCD display, the mode
string is “EPO”.
It is a special status in which the UPS would shut the output off and alarm.
The UPS could not be turned off by pressing “OFF” button on the panel,
only after releasing EPO status by turning off the EPO switch.
6.6 ECO mode (Economy mode)
It is also called high efficiency mode. In ECO mode, on LCD display, the
mode sting is “ECO”.
After the UPS is turned on, the power used by the load is supplied from
the utility power via internal filter while the utility power is in normal range,
so the high efficiency could be gained in the ECO mode. Once the mains
is loss or abnormal, the UPS would transfer to battery mode and the load
is supplied continuously by the battery.
1) It could be enabled through the LCD setting or the software (Winpower,
etc.).
2) It is attention that the transfer time of UPS output from ECO mode to
battery mode is less than 10ms. But it is still too long for some sensitive
load.