Alarm
ID
Alarm
Name
Alarm
Severity
Possible Cause Suggestion
2011 String
Reverse
Connecti
on
Major Cause ID = 1–20: PV1–PV20
The PV string is reversely
connected.
1. Check whether the PV
string is connected to the
device in reverse polarity.
If yes, wait until the PV
string current decreases to
below 0.5 A, set DC
SWITCH to OFF, and adjust
the PV string polarity.
2. If the fault persists, reset
the device on the local
maintenance app or
WebUI of the upper-layer
controller. Alternatively,
you can turn
o the AC
and DC switches, wait for
5 minutes, and then turn
on the AC and DC
switches.
2012 String
Current
Backfeed
Warnin
g
Cause ID = 1–20: PV1–PV20
Only a few PV modules are
connected in series in the PV
string. Therefore, the terminal
voltage is lower than that of
other PV strings.
1. Check whether the
number of PV modules
connected in series in the
PV string is less than that
in other PV strings
connected in parallel. If
yes, wait until the solar
irradiance declines at
night and the PV string
current drops below 0.5 A.
Then, turn
o the DC
switches and add more PV
modules.
2. Check whether the PV
string is shaded.
3. Check whether the open-
circuit voltage of the PV
string is normal.
SUN2000-(100KTL, 110KTL, 115KTL)-M2
User Manual 8 Maintenance
Issue 07 (2023-04-30) Copyright © Huawei Technologies Co., Ltd. 108
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