LBS DRAGON POWER 3, User Manual, Page: 51 / 62

4Use and Operation User Manual
44
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Fault phenomenon Possible reason
works normally, but the
computer system halted.
Meaning of fault symbol and buzzer status
LCD fault symbol Buzzer status Meaning
Fault info.
page (page
up or page
down by "
" button)
EPO Long beep
UPS has emergency protection (if equipped with EPO
function), Bypass output and inverting output are all
closed.
P/N
I/O
ERR
Long beep
UPS work mode setting and actual wiring mismatch,
please check the mains and bypass wiring, and see if
the wiring matches the work mode setting.
SEQ Long beep
UPS mains phase sequence abnormal. Please check if
the phase sequence of mains wiring is normal.
BMD Long beep
UPS maintenance bypass fault, the inverter output is
closed. Please check the detection port of
maintenance bypass on rear plate is short circuit.
BUS Long beep
The inner busbar voltage fault, the inverter output is
closed.
TMP Long beep
UPS is over-temperature protected, the inverter
output is closed. Please check if cooling fan is
damaged or air vents are blocked.
OUT Long beep
UPS output fault. Please check if the output of thr
UPS is short-circuit or overload.
BAT Long beep
UPS battery fault, battery low-voltage or over-
voltage protection.
PRA Long beep
The parameter setting of parallel system is
mismatching. Please check if the inverter voltage
mode or parallel mode of parallel system is
mismatching.