Huawei SUN2000-15KTL-50KTL-M3 Series User Manual page 34

Replacing SUN2000-(15KTL-50KTL) Series with
SUN2000-(15KTL-50KTL)-M3 Series
User Manual
ID Name
2013 Abnormal
string
power
2014 High
input
string
voltage to
ground
2021 AFCI
self-check
failure
2031 Phase
wire
short-circ
Issue 01 (2021-04-05)
Severity Cause
Warning  The PV string is shaded for
a long time.
 The PV string is aged
abnormally.
Cause ID 1–8: PV strings 1–8
Major Cause ID = 1
The voltage between the input
PV modules and the ground is
abnormal, and there is a risk of
power degradation.
Major Cause ID = 1, 2
The AFCI self-check fails.
Major Cause ID = 1
The impedance of the output
Copyright © Huawei Technologies Co., Ltd.
Solution
3. Check whether the PV string is
shaded.
1. Check whether the current of the
abnormal PV string is lower than
that of other PV strings. If yes,
check whether the abnormal PV
string is shaded and the actual
number of PV modules in the PV
string is the same as the
configured number.
2. If the abnormal PV string is clean
and not shaded, check whether
the PV string is damaged.
1. If no PID compensation device
exists in the system, disable the
PID protection function at night.
Note: If the PID protection
function is disabled but reactive
power compensation at night is
enabled, PV modules may be
degraded.
2. If the system has a PID
compensation device, check
whether the device is abnormal. If
yes, rectify the fault.
3. Check whether the settings of
compensation direction for the
inverter and the PID
compensation device are
consistent. If not, set them to be
consistent based on the PV
module model. (Note: If the PV–
is set to positive offset, the
voltage between the inverter PV–
and the ground should be greater
than 0 V to clear the alarm; if the
PV+ is set to negative offset, the
voltage between the inverter PV+
and the ground should be less
than 0 V to clear the alarm.)
4. If the alarm persists, contact your
dealer or Huawei technical
support.
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
9 Maintenance
97