UPS IST7 (10KVA-40KVA)
User Manual
5 Use and Operation
71
Fault phenomenon
Possible reason
outputting immediately.
circuit after UPS damage;
The load is not started according to "high power device
→ small power device". Restart the UPS, and after the
UPS works steadily, start high power load first, and then
start small power ones successively.
Buzzer long beeps, fault
indicator lights on, UPS
works in bypass mode and
inverter failure.
The output is overload. The load is too heavy and beyond
the rated power of the UPS. Please reduce load or select
a UPS with larger power capacity. If it is temporary
bypass caused by impact of load start and recovers
automatically, it still is normal;
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 power failure, it
doesn't transfer to battery
mode or it transfers to battery
mode and battery under-
voltage protection soon.
Battery aging, the battery capacity loss. Please replace
battery;
Battery charger fault. At ordinary time, the battery cannot
be charged;
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.
Meaning of fault symbol and buzzer status
NO.
Fault symbol
Buzzer status
Meaning
1
EPO
Long beep
UPS has emergency protection (if equipped
with EPO function), Bypass output and
inverting output are all closed.
2
Mode fault
Long beep
UPS system mode system settings and the
