Huawei SUN2000 M0 Series User Manual page 81

SUN2000-(3KTL-10KTL)-M0
User Manual
Alarm ID Alarm
Name
2038 Unstable
Grid
Frequenc
y
2039 Output
Overcurr
ent
2040 Output
DC
Compone
nt
Overhigh
2051 Abnorma
l Residual
Current
Issue 06 (2020-10-23)
Alarm Possible Cause
Severity
Major Cause ID = 1
Power grid exception: The
actual grid frequency
change rate does not
comply with the local
power grid standard.
Major Cause ID = 1
The grid voltage drops
dramatically or the power
grid is short-circuited. As a
result, the inverter
transient output current
exceeds the upper
threshold, and inverter
protection is triggered.
Major Cause ID = 1
The DC component in the
grid current exceeds the
upper threshold.
Major Cause ID = 1
The input-to-ground
insulation impedance has
decreased during the
inverter operation.
Copyright © Huawei Technologies Co., Ltd.
7 Maintenance
Troubleshooting Suggestion
1. If the alarm occurs
accidentally, the power grid
may be abnormal
temporarily. The inverter
automatically recovers after
detecting that the power grid
becomes normal.
2. If the alarm occurs
frequently, check whether the
grid frequency is within the
acceptable range. If no,
contact the local power
operator.
1. The inverter monitors its
external working conditions
in real time. The inverter
automatically recovers after
the fault is rectified.
2. If the alarm occurs frequently
and affects the power
production of the PV plant,
check whether the output is
short-circuited. If the fault
persists, contact your dealer
or Huawei technical support.
1. The inverter monitors its
external working conditions
in real time. The inverter
automatically recovers after
the fault is rectified.
2. If the alarm occurs
frequently, contact your
dealer or Huawei technical
support.
1. If the alarm occurs
accidentally, the external
power cable may be
abnormal temporarily. The
inverter automatically
recovers after the fault is
rectified.
2. If the alarm occurs frequently
or persists, check that the
impedance between the PV
string and ground is not
below the lower threshold.
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