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12. Troubleshooting
In the event of an observed failure or unexpected behavior, first check external factors that may impact UPS system functionality (e.g.,
environmental conditions such as excessive temperature or humidity, installation or site changes with cabling). Additionally, ensure all breakers
are switched to the “On” position.
Section 9.4: Text Summaries and Explanations
includes the list of event notifications that may be displayed
in the Events screen, including those for many external factors.
If there are no events displayed and the behavior is not shown in the events notifications or the table below, contact your dealer.
Event Display Text
Possible Cause
Remedy
Line Fail
The AC input cable is loose
Confirm input cable is firmly connected to the
input terminal
Battery Open
The battery connector cable is loose
Confirm battery cable is firmly connected to the
input terminal
Line Phase Error
The AC input 1 sequence of R-S-T is incorrect
Confirm the AC input 1 sequence is correct
Bypass Phase Error
The AC input 2 sequence of R-S-T is incorrect
Confirm the AC input 2 sequence is correct
ID Conflict
Module ID numbers have been duplicated
Reset the module ID addresses
Module Unlock
One of the Power Modules is unlocked
Confirm the Ready switch is fixed at the right
position
Redundancy Set Fail
The module redundancy setting is incorrect
Reset module redundancy setting
Battery Fault
Internal or external batteries are connected
incorrectly
Check battery connections
Overload Fault
UPS system is overloaded
Switch off or remove excess loads attached to the
output of the UPS system
R or S or T Inverter Voltage Short
The UPS shut down due to short circuit on the UPS
output
Check output wiring; confirm if connected devices
are in short circuit status
RS or ST or TR Inverter Voltage Short The UPS shut down due to short circuit on the UPS
output
Check output wiring; confirm if connected devices
are in short circuit status
Over Temperature
UPS system temperature is too high
Check fans are working correctly
N Loss
Input neutral wire is disconnected
Check and correct the input neutral connection
Battery backup time is shorter than
nominal value
Batteries are not fully charged, or batteries are
defective
Charge batteries for at least 10 hours at 1/10C
charging rating, then recheck battery capacity
Other fault codes are shown; alarm
beeps continuously
A UPS system internal fault has occurred
Contact dealer
