PowerWalker VFI 1000T LCD, Manual

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(1) When the UPS is running in battery mode, the buzzer beeps once
every 4 seconds. If the “ON” button on the front panel is pressed
for more than 1 second again, the buzzer will stop beeping (in
silence mode). Press the “ON” button once again for more than 1
second to resume the alarm function.
2) If the UPS is working in battery mode for the input line voltage is
higher than the SPEC range, the alarm symbol - “H” will be shown;
if the UPS is working in battery mode for the input line voltage is
lower than the SPEC range, the alarm symbol - “L” will be shown;
if the input line voltage is lost, the alarm symbol - “L” would be
shown.
6.3 Bypass mode
The LCD display in bypass mode is shown in the following diagram.
The information about the utility power, the battery, the UPS output
and the load could be displayed. The UPS will beep once every 2
minutes in bypass mode. The “MODE” and “1” code indicate the UPS
is working in the bypass mode.
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The Battery mode