P91 Lead Acid 2U User’s Manual
Uninterruptible Power Supply
Xtreme Power Conversion Corporation
Page 24
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 mains 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
flash on LCD display and alarm
is sounding every 2 seconds.
EPO function is activated.
Set the circuit in closed
position to disable EPO
function.
The icons of
and
,
and the
warning code
flash on LCD
display. Alarm is sounding every 2
seconds.
Line and neutral conductors
of UPS input are reversed.
Rotate mains power socket
by 180° and then connect to
UPS system.
The icons of
and
and the
warning code
flash on LCD
display. Alarm is sounding every 2
seconds.
The external or internal
battery is incorrectly
connected.
Check if all batteries are
connected well.
Fault code is shown as 27 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 on LCD
display and alarm is continuously
sounding.
Battery voltage is too low or
the charger is fault.
Contact your dealer.
The icons
and
and the
warning code
flash on LCD
display. Alarm is sounding 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.
Fault code is shown as 49 on LCD
display and alarm is continuously
sounding.
UPS is over input current.
Remove excess loads from
UPS output.
Fault code is shown as 43 and the
icon
is lighting on LCD display.
Alarm is continuously sounding.
The UPS shut down
automatically because of
overload at the UPS output.
Remove excess loads from
UPS output and restart it.
