Alarm
ID
Alarm
Name
Severity Possible Cause Suggestion
3857 Memory
Exception
Minor Cause ID = 1
1. The storage space is
insucient.
2. The memory is faulty.
Contact your technical support.
3858 48 V DC
Auxiliary
Power
Supply
Faulty
Major Cause ID = 1
1. The 48 V DC auxiliary
power supply is
inadequate.
2. The SMU
communication failed or
the SMU is not
connected.
1. Check whether the rectier is
correctly installed.
2. Maintain the rectier based on
the alarm and troubleshooting
suggestions.
3. Check whether the SMU has
been added to the device list.
4. Maintain the SMU based on the
alarm and troubleshooting
suggestions.
3859 Forced
Dehumidif
ication
Started
Major Cause ID = 1
1. Forced
dehumidication has
been manually started.
2. To prevent
condensation in the
cabinet after the cabinet
door is opened, the
system automatically
starts forced
dehumidication.
1. Wait for 20 to 30 minutes for the
system to automatically stop forced
dehumidication.
2. If you manually start forced
dehumidication, the system will
shut down after forced
dehumidication is completed. You
need to manually start the system.
3. If forced
dehumidication is
automatically started, the system
automatically restores to the
original state after forced
dehumidication is completed.
3860 IO
Expansion
Board
Fault
Minor Cause ID = 1
IO Expansion Board
Fault
1. Check whether the cable
between the I/O expansion board
and the CMU (RS485-1) is correctly
connected. If not, reconnect the
cable.
2. Check whether the power cable
of the I/O expansion board is loose.
If yes, connect the cable securely.
3. If the fault persists, contact your
technical support.
If ALM-3833 Rectier Fault, ALM-3834 Rectier Protection, ALM-3835 Rectier
Communication Failure, ALM-3836 Rectier Power Failure, or ALM-3837 Rectier
Output Overvoltage is generated, rectify the fault by referring to the following table.
LUNA2000-2.0MWH Series Smart String ESS
User Manual 10 Alarm Reference
Issue 08 (2022-11-15) Copyright © Huawei Technologies Co., Ltd. 189
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