4 Operation and Maintenance
User Manual
24
Fault phenomenon
Possible reason
allowable range.
Usually, UPS works normally.
When power failure, it doesn't
transfer to battery mode or it
transfers to battery mode and
battery under-voltage protection
soon.
1) Battery aging, the battery capacity loss. please
replace battery.
2) Battery charger fault. At ordinary time, the battery
cannot be charged.
3) Battery wire doesn't connect well or the terminals
contact is bad.
When the load is PC, everything
works normally. When power
failure, UPS works normally, but
the computer system halted.
The grounding connection is not so good. The floating
voltage between the neutral wire and the grounding
wire is too high.
Table4-2
The meaning of fault symbol and buzzer status
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.
BUS Long beep
The inner busbar voltage fault, the inverting
output is closed.
TMP Long beep
UPS is over-temperature protected, the
inverting output is closed. Please check if
cooling fan is damaged or air vents are
blocked.
FAN
Rapid beep (Alarm
once about every
0.5s)
Fan fault alarm prompting, the inverting
output is going to protect. Please check if
cooling fan is damaged or blocked.
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.
Summary of Contents for IST3-J
Page 1: ...UPS IST3 J 1 10 kVA User Manual...
Page 2: ......
Page 6: ......
Page 24: ...3 Installation User Manual 18 Figure3 3 Wiring diagram of 1kVA L...
Page 37: ......