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7
Troubleshooting
Problem
No indication and alarm even
though the main is normal.
The icon
and the warning
code EP are flashing on LCD
display and alarm is sounding
every second.
The icon
and
warning code SF are flashing
on LCD display. Alarm is
sounding every 2 seconds.
The icon
and
warning code NC are flashing
on LCD display. Alarm is
sounding every 2 seconds.
Fault code is shown as 27
and the icon
on LCD display and alarm is
continuously sounding.
Fault code is shown as 28
and the icon
on LCD display and alarm is
continuously sounding.
Possible cause
The AC input
power is not
connected well.
The AC input is
connected to the
UPS output.
EPO function is
activated.
the
Line and neutral
conductors of UPS
input are reversed.
The external or
and
internal battery
is incorrectly
connected.
Battery voltage
is lighting
is too high or the
charger is fault.
Battery voltage
is lighting
is too low or the
charger is fault.
Solutions
Check if input
power cord is
firmly connected
to the mains.
Plug the AC input
power cord to the
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 service
unit.
Contact service
unit.
33
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