Huawei SUN2000-15KTL-50KTL-M3 Series User Manual page 33

Replacing SUN2000-(15KTL-50KTL) Series with
SUN2000-(15KTL-50KTL)-M3 Series
User Manual
ID Name
2001 High
string
input
voltage
2002 DC arc
fault
DC arc
2003
fault
2011 String
reverse
connectio
n
String
2012
current
backfeed
Issue 01 (2021-04-05)
Severity Cause
Major The PV array is not properly
configured. Excessive PV
modules are connected in
series to the PV string, and
therefore the PV string
open-circuit voltage exceeds
the maximum inverter
operating voltage.

Cause ID 1: PV strings 1
and 2
 Cause ID 2: PV strings 3
and 4
 Cause ID 3: PV strings 5
and 6
 Cause ID 4: PV strings 7
and 8
Major The PV string power cables arc
or are in poor contact.

Cause ID 1: PV strings 1
and 2

Cause ID 2: PV strings 3
and 4

Cause ID 3: PV strings 5
and 6

Cause ID 4: PV strings 7
and 8
The PV string power cables arc
Major
or are in poor contact.
Cause ID 1–8: PV strings 1–8
Major The PV string polarity is
reversed.
Cause ID 1–8: PV strings 1–8
The number of PV modules
Warning
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.
Solution
Reduce the number of PV modules
connected in series to the PV string
until the PV string open-circuit
voltage is less than or equal to the
maximum inverter operating voltage.
After the PV string configuration is
corrected, the alarm disappears.
Check whether the PV string cables
arc or are in poor contact.
Check whether the PV string cables
arc or are in poor contact.
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 two DC switches 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.
9 Maintenance
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