(1-10kVA) UPS IST3
User Manual
40
Fault phenomenon
Possible reason
protection soon.
3) Battery wire doesn't connect well or the
terminals are with poor contact.
When the load is PC, everything
works normally. When power
failure, UPS works normally, but
the computer halts.
The grounding is unreliable for the floating voltage
between the neutral wire and the grounding wire is
too high.
The meaning of fault symbol and buzzer status
Fault symbol
Buzzer status
Meaning
Fault
info.
page (page
up or page
down
by
"SELECT"
button)
EPO Long beep
UPS has emergency protection (if equipped
with EPO function), Bypass output and
inverting output are all closed.
BUS Long beep
There has busbar voltage fault in the UPS,
the inverting output is closed.
TMP Long beep
UPS has over-temperature protection, the
inverting output is closed. Please check if
cooling fan damage and air vents blocked.
FAN
Rapid beep (Alarm
once about every
0.2s)
Fan fault alarm prompting, the inverting
output is going to protect. Please check if
cooling fan damage.
Long beep
Fan fault protection. The inverting output is
closed.
OUT Long beep
Output fault, please check if output is short-
circuit or the load is too large.
BAT
Long beep
Battery fault, battery voltage too low or too
high protection.
PRA Long beep
Parameters error in the parallel system.
Please check if the inverting voltage format or
the parallel mode setting (PRA mode and
