Huawei SUN2000 Series User Manual page 65

SUN2000-(12KTL-25KTL)-M5 Series
User Manual
Alarm Alarm
ID Name
2021 AFCI self-
check
failure
2031 Phase
wire
short-
circuited
to PE
2032 Grid loss
2033 Grid
undervolt
age
Issue 01 (2022-06-15)
Alarm Possible Causes
Severity
Major Cause ID = 1
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 short-
circuited to PE.
Major Cause ID = 1
● Power grid
outage occurs.
● The AC circuit is
disconnected or
the AC switch is
off.
Major Cause ID = 1
The power grid
voltage is below
the lower threshold
or the low-voltage
duration has lasted
for more than the
value specified by
LVRT.
Copyright © Huawei Digital Power Technologies Co., Ltd.
Troubleshooting
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.
1. The alarm is cleared automatically
after the power grid recovers.
2. Check whether the AC circuit is
disconnected or the AC switch is off.
1. If the alarm occurs occasionally, the
power grid may be abnormal
temporarily. The inverter
automatically recovers after detecting
that the power grid becomes normal.
2. If the alarm persists, check whether
the power grid voltage is within the
acceptable range. If not, contact the
local power operator. If yes, modify
the grid undervoltage protection
threshold through the app,
SmartLogger, or NMS with the
consent of the local power operator.
3. If the alarm persists for a long time,
check the AC circuit breaker and AC
output power cable.
8 Maintenance
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