5 Use and Operation
65
Fault phenomenon
Possible reason
2.
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.
1.
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;
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 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.
Table5-2
Meaning of fault symbol and buzzer status
NO.
LCD
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
Phase Set Long beep
UPS system mode system settings and the
Summary of Contents for IST9
Page 1: ...l un I Jet _________ __ AEC IST9 1 0 20 https www uni jet com catalog ibp on line ibp aec ist9...
Page 2: ...UPS IST9 10 20 kVA User Manual...
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Page 52: ...3 Installation 43 Figure3 29 Diagram of 33 mode parallel system wiring of 10kVA 20kVA UPS...
Page 54: ...3 Installation 45 Figure3 31 Diagram of 33 mode parallel system wiring of 30kVA 40kVA UPS...
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