AEG UPS IST3 1-10kVA User Manual page 39

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