Huawei SUN2000-50KTL-ZHM3 User Manual page 82

SUN2000-(50KTL-ZHM3, 50KTL-M3)
User Manual
ID Name
2009 String
Short-
Circuited
to
Ground
2011 String
reverse
connecti
on
2012 String
current
backfeed
Issue 05 (2023-02-28)
Severity Cause
Major 1. The PV array is short-
circuited to ground.
2. The ambient
environment of PV arrays is
moist.
Major The PV string polarity is
reversed.
Cause ID 1–8: PV strings 1–
8
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 1–8: PV strings 1–
8
Copyright © Huawei Technologies Co., Ltd.
8 Maintenance
Solution
1. Check the output-to-ground
impedance of the PV array. If a
short circuit or inadequate
insulation is detected, rectify it.
2. If auto recovery from string-
to-ground short-circuit
protection is disabled, check and
rectify the preceding faults, and
manually clear the alarm.
3. If auto recovery from string-
to-ground short-circuit
protection is enabled, the alarm
will be automatically cleared
after fault recovery.
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 off
the AC and DC switches, wait
for 5 minutes, and then turn
on the AC and DC switches.
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.
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