4 Operation and Maintenance
User Manual
38
Fault phenomenon
Possible reason
and inverter failure.
load or select UPS with larger power capacity. It is
normal that UPS works in the bypass mode
temporarily for load startup impact and then recover
automatically
2)
UPS over-temperature protection. Check if the air
inlet and air outlet of UPS is blocked or the working
temperature of UPS is beyond the allowable range.
Usually, UPS works normally. When
UPS powers off, it doesn't transfer to
battery mode or it transfers to battery
mode and battery has under-voltage
protection soon.
1)
Battery aging, battery capacity loss or it needs to
replace battery.
2)
Battery charger fault. Usually, it can't charge battery.
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.
Table4-2
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.
