Huawei SUN2000 M5 Series User Manual page 74

SUN2000-(12KTL-25KTL)-M5 Series
User Manual
Alarm Alarm
ID Name
2011 String
reverse
connectio
n
2012 String
current
backfeed
2021 AFCI self-
check
failure
2031 Phase
wire
short-
circuited
to PE
2032 Grid loss
Issue 03 (2023-02-15)
Alarm Possible Causes
Severity
Major The PV string
polarity is reversed.
Cause ID 1–4: PV
strings 1–4
Warning The number of PV
modules connected
in series to the PV
string is
insufficient. As a
result, the terminal
voltage is lower
than that of other
strings.
Cause ID 1–4: PV
strings 1–4
Major Cause ID = 1
The AFCI self-check
fails.
Major Cause ID = 1
The impedance of
the output phase
wire to PE is low or
the output phase
wire is short-
circuited to PE.
Major Cause ID = 1
● Power grid
outage occurs.
● The AC circuit is
disconnected or
the AC switch is
off.
Copyright © Huawei Digital Power Technologies Co., Ltd.
Troubleshooting
Check whether the PV string is reversely
connected to the inverter. If yes, wait
until the solar irradiance declines at
night and the PV string current drops to
below 0.5 A. Then, turn off the DC
switch and correct the PV string
connection.
1. Check whether the number of PV
modules connected in series to the
PV string is less than that of other PV
strings. If yes, wait until the PV string
current drops below 0.5 A, turn off all
DC switches, and adjust the number
of PV modules in the PV string.
2. Check whether the open-circuit
voltage of the PV string is abnormal.
3. Check whether the PV string is
shaded.
Turn off the AC output switch and DC
input switch, and then turn them on
after 5 minutes. If the alarm persists,
contact Huawei technical support.
Check the impedance of the output
phase wire to PE, locate the position
with low impedance, and rectify the
fault.
1. The alarm is cleared automatically
after the power grid recovers.
2. Check whether the AC circuit is
disconnected or the AC switch is off.
8 Maintenance
68