Troubleshooting - Uninterruptible Power Supplies Online UPS 1K User Manual

4. Troubleshooting

If the UPS system does not operate correctly, please solve the problem by using the table
below.
Symptom
No indication and alarm even
though the main is normal.
The icon and the warning
code flashing on LCD display
and alarm is sounding every
second.
The icon and
on LCD display and alarm is
sounding every second.
The icon and
on LCD display and alarm is
sounding every second.
Fault code is shown as 27 and the
icon is lighting on LCD
display and alarm is continuously
sounding.
Fault code is shown as 28 and the
icon is lighting on LCD
display and alarm is continuously
sounding.
The icons of and
are flashing on LCD display and
alarm is sounding twice every
second.
Possible cause
The AC input power is not
connected well.
The AC input is connected
to the UPS output.
EPO function is activated.
Line and neutral
flashing
conductors of UPS input
are reversed.
The external or internal
flashing
battery is incorrectly
connected.
Battery voltage is too high
or the charger is fault.
Battery voltage is too low
or the charger is fault.
UPS is overload
UPS is overloaded. Devices
connected to the UPS are
fed directly by the
electrical network via the
Bypass.
After repetitive overloads,
the UPS is locked in the
Bypass mode. Connected
devices are fed directly by
the mains.
18
Remedy
Check if input power cord
firmly connected to the
mains.
Plug AC input power cord
to AC input correctly.
Set the circuit in closed
position to disable EPO
function.
Rotate mains power socket
by 180° and then connect
to UPS system.
Check if all batteries are
connected well.
Contact your dealer.
Contact your dealer.
Remove excess loads from
UPS output.
Remove excess loads from
UPS output.
Remove excess loads from
UPS output first. Then shut
down the UPS and restart
it.