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IST Series UPS (10kVA-200kVA)
User Manual 6 Maintenance and Troubleshooting
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 Do not open or disassemble the battery, for the inner electrolyte is harmful for skin and
eyes.
6.4 Troubleshooting
6.4.1 Common Abnormal Phenomena Diagnosis
If the UPS works abnormally after start, please refer to Table6-1 to find possible reason.
Meanwhile, check whether the fault is caused by external environment, such as temperature,
humidity is not accordance with the requirement or overload.
Table6-1only includes some simple diagnosis. If the diagnosis is not clear, or not sufficient to
solve the problem, please contact with local agency or dealer to deal with.
Table6-1 Troubleshooting
NO Abnormal phenomena Possible reason
1 Mains normal, but UPS
works in battery
inverting status, the
buzzer beeps
intermittently.
Each connection point, socket of grid feed circuit is not so
good, which causes the AC power supply input unblocked.
2 After installation, close
breaker or switch of
power supply, it will
fuse the fuse or trip off.
The three-phase input wires are wrongly connected, such
as neutral wire and ground wire or live wire and grounding
(case) is wrongly connected or the three-phase output wire
is wrongly connected.
3 After startup, the UPS
outputs 220V AC
power, but the UPS
works in bypass status.
1. The load it too large and exceed the rated output
capacity of the UPS. It needs to reduce load or select a
UPS with larger output capacity.
2. If it is temporary bypass caused by the impact of load
startup, and it can recover to normal automatically, that
is normal.