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MR33 Series (75K-600K) Modular UPS
User Manual
A new battery should be with the same capacity, model, and manufacturer as the replaced one.
The battery with different capacity, different type and different manufacturer battery is strictly
forbidden to use together.
Dangerous voltage may exist in the battery terminal and grounding terminal, before touching,
please measure if there is dangerous high voltage, which is to avoid endanger human safety. It is
strictly forbidden to touch the two wiring pillars or the bare end of battery.
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
Mains normal, but UPS
works in battery inverting
1
status, the buzzer beeps
intermittently.
After installation, close
breaker or power supply
2
switch, the fuse will fuse
or trip off.
After startup, the UPS
outputs 220V AC power,
3
but the UPS works in
bypass status.
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Possible reason
Each connection point, socket of grid circuit is not so good,
which causes the AC power supply input blocked.
The three-phase input wire is 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.
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.
6 Maintenance and Troubleshooting
101
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Troubleshooting
