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Battery open
Battery pack is not
connected
correctly
Do the battery test to
confirm.
Check the battery bank is
connected to the UPS.
Check the battery breaker is
turn on.
Overload
Overload
Check the loads and
remove some non-critical
loads.
Site fail
Phase and neutral
conductor at input
of UPS system are
reversed
Check UPS installation.
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 the ventilation of the
UPS, check the ambient
temperature and ventilation.
Inverter short
Output short circuit Remove all the loads. Turn
off the UPS. Check whether
the output of UPS or loads
are short circuit. 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
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