Alarm
ID
Alarm
Name
Alarm
Severit
y
Possible Causes Suggestions
2012 String
Current
Backfee
d
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-(75KTL, 100KTL, 110KTL, 125KTL) Series
User Manual 8 Maintenance
Issue 11 (2021-11-10) Copyright © Huawei Technologies Co., Ltd. 112
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