PowerWalker VFI 1000 LE - Manual (Page 19)

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3.2 Start the UPS with mains (AC source)
1) If the UPS is a long back up time model, with external battery banks, please
switch on the battery breaker first;
2) If the wiring is correct, turn on the mains breaker in your building. Then
the power supply inside the UPS will be started automatically, the fans
will run, and the panel will display with bypass mode.
Note 1: If the UPS have been set to enable the bypass output, the output
socket will have the voltage directly from mains after you turn on the
input breaker.
Note 2: In bypass mode, the load is not protected. You should go on to
the next step to turn on the UPS for protecting your load.
3) Press the button of the UPS front panel continuously for more than 2
seconds. The buzzer will beep once, and all the LEDs will be lightened,
and then black out one by one. After a few seconds of self-diagnoses,
the UPS will be turned on to the normal mode (line mode) and output the
spec voltage.
4) After the UPS is turned on to line mode normally, the Inverter LED will be
on, the Bypass/Battery LED will be off. The Load/Battery level LEDs will
be lightened according to the load capacity. There is no beep of buzzer.
Note: If the UPS is shutdown in battery mode automatically, when the mains
power returned to the input, the UPS will start up and switch to line mode
automatically.
3.3 Start the UPS with battery (DC source) only
This UPS can be started with DC source (battery) without AC source.
1) If the UPS is a long back up time model with external battery banks, please
switch on the battery breaker first.
2) Press the button of the UPS front panel continuously for more than 2
seconds. The buzzer will beep once, and all the LEDs will be lightened,
and then black out one by one. After a few seconds of self-diagnoses,