19
ENGLISH
ITYS
1-10 kVA - Ref.: IOMITYTWXX05-GB 00
If the UPS system does not operate correctly use the table below to try and resolve the problem.
Problem
Possible cause
Remedy
No indication, no warning tone even though
system is connected to mains power supply
No input voltage
Check building wiring socket outlet and
input cable.
Displays battery modes, and alarm
sounds every 4 seconds
Mains power supply has failed, or input
power and/or frequency are outside tole-
rance limits
Switching to battery mode automatically.
Check input power source.
Backup time shorter than nominal value
Batteries not fully charged / batteries
defect
Charge the batteries for at least 5 - 8
hours and then check capacity. If the
problem still persists, consult your dealer.
Fan failure
Fan abnormal
Check if the fan is running
Battery over voltage
Battery is over charged
Switch to battery mode automatically,
and after the battery voltage is normal
and the mains is normal, the UPS should
switch to line mode automatically again.
Battery low
Battery voltage is low
When alarm sounds every second bat-
tery is almost empty.
Charge failure
The charge is broken
Notify dealer.
DC-DC temperature high
Internal UPS temperature too high
Check UPS ventilation of the UPS, check
the ambient temperature.
Inverter temperature high
Inside temperature of the UPS is too high Check the ventilation, check ambient
temperature.
Ambient temperature high
The ambient temperature is too high
Check room ventilation.
Line voltage high (OVCD action)
Input power voltage is too high
Switch to battery mode automatically,
after the mains is normal the UPS should
switch to line mode automatically again.
Battery open
Battery pack is not connected correctly
Do the battery test to con
fi
rm.
Check the battery bank is connected to the UPS.
Check the battery breaker is turned on.
Overload
Overload
Check the loads and remove some non-
critical loads.
Check whether some loads have failed.
Site failure
Phase and neutral conductor at input of
UPS system are reversed
Rotate mains power socket by 180° or
connect UPS system.
EPO active
EPO function is enabled
Turn off the EPO switch.
Bus fault
UPS internal fault
Notify dealer
Inverter fault
UPS internal fault
Notify dealer
Over temperature fault
Over temperature
Check UPS ventilation, check ambient
temperature and ventilation.
Inverter short
Output short circuit
Remove all the loads. Turn off the UPS.
Check whether the output of UPS and
loads have short circuited. Make sure
the short circuit is removed, and the UPS
has no internal faults before turning on
again.
Bus short
UPS internal fault
Notify dealer
10. TROUBLESHOOTING
