Huawei SUN2000 M0 Series User Manual page 77

SUN2000-(3KTL-10KTL)-M0
User Manual
Alarm ID Alarm
Name
2012 String
Current
Backfeed
2021 AFCI Self-
Check
Failure
2031 Phase
Wire
Short-
Circuited
to PE
2032 Grid Loss
Issue 06 (2020-10-23)
Alarm Possible Cause
Severity
Warning The number of PV modules
connected in series to this
PV string is insufficient. As
a result, the end voltage is
lower than that of other
strings.
● Cause ID 1 = PV1
● Cause ID 2 = PV2
Major Cause ID = 1, 2
AFCI 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
● The power grid
experiences an outage.
● The AC power cable is
disconnected or the AC
circuit breaker is OFF.
Copyright © Huawei Technologies Co., Ltd.
7 Maintenance
Troubleshooting Suggestion
1. Check whether the number
of PV modules connected in
series to this PV string is less
than the number of PV
modules connected in series
to the other PV strings
connected in parallel with
this PV string. If yes, wait
until the PV string current
decreases below 0.5 A, set DC
SWITCH to OFF, and adjust
the number of PV modules in
the PV string.
2. Check whether the PV string
is shaded.
3. Check whether the open-
circuit voltage of the PV
string is normal.
Turn off the AC output switch
and DC input switch, and then
turn them on after 5 minutes. If
the fault persists, contact your
dealer or Huawei technical
support.
Check the impedance of the
output phase wire to PE, locate
the position with lower
impedance, and rectify the fault.
1. Check that the AC voltage is
normal.
2. Check that the AC power
cable is connected and that
the AC switch is ON.
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