Chapter 4 : Troubleshooting - Delta Amplon MX Series User Manual

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 mains
is normal.
The icon
warning code
ing on LCD display and
alarm is sounding every
2 seconds.
The icon
the warning code
flashing on LCD display
and alarm is sounding
every 2 seconds.
The icon
the warning code
flashing on LCD display
and alarm is sounding
every 2 seconds.
Fault code is shown as
27 on LCD display and
alarm is continuously
sounding.
Fault code is shown as
28 on LCD display and
alarm is continuously
sounding.
Amplon MX Series

Chapter 4 : Troubleshooting

The AC input power is not
connected well.
The AC input is connected
to the UPS output.
and the REPO function is activated.
flash-
Line and neutral conductors
, and
of UPS input are reversed.
, and The external or internal
battery is incorrectly con-
nected.
Battery voltage is too high
or the charger is fault.
Battery voltage is too low or
the charger is fault.
Possible Cause
3 1
Remedy
Check if the input
power cord firmly con-
nected to the mains.
Plug AC input power
cord to AC input cor-
rectly.
Set the circuit in close
position to disable
REPO 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.