Huawei SUN2000-M3 User Manual page 87

SUN2000-(20KTL, 29.9KTL, 30KTL, 36KTL, 40KTL)-
M3
User Manual
ID Name
2037 Grid
underfre
quency
2038 Unstable
grid
frequenc
y
2039 AC
Overcurr
ent
Issue 11 (2023-01-10)
Severity Cause
Major Cause ID = 1
Power grid exception: The
actual power grid
frequency is lower than the
requirements for the local
power grid code.
Major Cause ID = 1
Power grid exception: The
actual change rate of the
power grid frequency does
not meet the requirements
for the local power grid
code.
Major Cause ID = 1
The grid experiences a
dramatic voltage drop or is
short-circuited. As a result,
the transient AC current of
the device exceeds the
upper threshold and
triggers protection.
Copyright © Huawei Technologies Co., Ltd.
8 Maintenance
Solution
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
frequency is within the
acceptable range. If not,
contact the local power
operator. If yes, modify the
grid underfrequency
protection threshold through
the app, SmartLogger, or
NMS with the consent of the
local power operator.
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
frequency is within the
acceptable range. If not,
contact the local power
operator.
1. The device detects its external
working conditions in real time.
After the fault is rectified, the
device automatically recovers.
2. If the alarm occurs frequently
and affects the operation of the
power plant, check whether AC
short circuit exists. If the fault
persists, contact your dealer or
technical support.
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