Niveo Professional NUPS22-1000U - Manual (Page 21)

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