When the input voltage is beyond the
acceptable range or power failure and
alarm is Beeping every 4 second, UPS
will backup power from battery.
When input voltage is within acceptable
range but UPS is overload, UPS will
enter bypass mode or bypass mode can
be set by front panel. Alarm is Beeping
every 10 second.
UPS is powered off and no output
supply power, but still can charge
batteries.
3-7. Faults Reference Code
Beeping twice every second
Out of bypass voltage range
Bypass frequency unstable