OPTI-UPS DS160KD33 - Manual (Page 26)

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BAT LOW – the LED will lit as long as the DC voltage is lower than
320VDC.
BAT LOW STOP – the LED will lit as long as the DC voltage is lower than
295VDC, inverter on is prohibited.
FAULT – the inverter is shutdown due to abnormal conditions such as
overload, short circuit, high DC, fuse over temperature, bypass breaker on
or emergent stop.
Since these LEDs are located behind the transparent window, the user can see
them clearly without opening the door.
D: Buzzer outlet: The buzzer is located inside the PCB holder; therefore, a hole is
opened to let the beep sound can be heard outside. Usually, the user should not be
expected to watch the UPS all the time, therefore when abnormal conditions
happen audible sound should be emitted to warn the user come over to check
what happens to the UPS. The buzzer will beep under either one of the following
conditions:
INVERTER IS OVERLOADED-
>110%, beep once / 3 seconds
>125%, beep once / second
>150%, beep twice / second
BACK- UP
>320VDC, beep once / 3 seconds
<320VDC, beep twice / second
<295VDC, no beeping
INVERTER IS SHORT CIRCUITED - beep continuously
FUSE BROKEN - beep continuously
HEAT SINK OVER TEMPERATURE - beep continuously
HIGH DC SHUTDOWN - beep continuously
BYPASS ON STOP - beep continuously