Huawei SUN2000 Series User Manual page 66

SUN2000-(20KTL, 29.9KTL, 30KTL, 36KTL, 40KTL)-
M3
User Manual
ID Name
2037 Grid
underfre
quency
2038 Unstable
grid
frequenc
y
2039 Output
overcurr
ent
Issue 01 (2020-10-15)
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 power grid voltage
drops dramatically or the
power grid is short-
circuited. As a result, the
inverter transient output
current exceeds the upper
threshold, and protection is
triggered.
Copyright © Huawei Technologies Co., Ltd.
8 Maintenance
Solution
● If the alarm occurs
occasionally, the power grid
may be abnormal
temporarily. The inverter
automatically recovers after
detecting that the power grid
becomes normal.
● 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.
● If the alarm occurs
occasionally, the power grid
may be abnormal
temporarily. The inverter
automatically recovers after
detecting that the power grid
becomes normal.
● If the alarm persists, check
whether the power grid
frequency is within the
acceptable range. If not,
contact the local power
operator.
● The inverter monitors its
external operating conditions
in real time and
automatically recovers after
the fault is rectified.
● If the alarm persists and
affects the energy yield of the
PV plant, check whether the
output is short-circuited. If
the fault cannot be rectified,
contact your dealer or
Huawei technical support.
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