Huawei SUN2000-50KTL-ZHM3 User Manual page 74

SUN2000-(50KTL-ZHM3, 50KTL-M3)
User Manual
ID Name
fault
2003 DC arc
fault
2011 String
reverse
connectio
n
2012 String
current
backfeed
2021 AFCI
self-check
failure
2031 Phase
wire
short-circ
uited to
PE
Issue 01 (2022-07-29)
Severity Cause
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
Major The PV string power cables arc
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
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
Major Cause ID = 1, 2
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
Copyright © Huawei Technologies Co., Ltd.
Solution
arc or are in poor contact.
Check whether the PV string cables
arc or are in poor contact.
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.
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.
8 Maintenance
67