Huawei SUN2000-15KTL-50KTL-M3 Series User Manual page 30

Replacing SUN2000-(15KTL-50KTL) Series with
SUN2000-(15KTL-50KTL)-M3 Series
User Manual
ID Name
305 Abnormal
grid
frequency
Issue 01 (2021-04-05)
Severity Cause
disconnected or the AC
switch is off.
 Cause ID = 31/32/33
The impedance of the
output phase wire A (cause
ID = 31)/B (cause ID =
32)/C (cause ID = 33) to the
PE cable is low or the wire
is short-circuited.
Major  Cause ID = 2
The actual power grid
frequency is higher than the
requirements for the local
power grid code.
 Cause ID = 4
The actual power grid
frequency is lower than the
requirements for the local
power grid code.
 Cause ID = 5
The actual change rate of
the power grid frequency
does not meet the
requirements for the local
power grid code.
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Solution
2. If you have confirmed that the
voltage at the grid connection
point exceeds the upper
threshold and obtained
consent from the local power
operator, modify the
overvoltage protection
thresholds.
3. Check whether the peak grid
voltage exceeds the upper
threshold.
 Cause ID = 28
1. If the exception is caused by
an external fault, the inverter
automatically recovers after
the fault is rectified.
2. If the alarm persists and
affects the energy yield of the
PV plant, contact the local
power operator.
 Cause ID = 29
1. Check the AC voltage.
2. Check whether the AC circuit
is disconnected or the AC
switch is off.
 Cause ID = 31/32/33
Check the impedance of the
output phase wire A (cause ID =
31)/B (cause ID = 32)/C (cause
ID = 33) to the PE cable, locate
the position with lower
impedance, resolve the issue.
 Cause ID = 2/4
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, log in to the
app, SmartLogger, or NMS to
change the power grid
overfrequency and
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