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SUN2000-(33KTL-A, 36KTL, 42KTL)
User Manual
8 Maintenance
Issue 07 (2018-05-04)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
94
Alarm
ID
Alarm
Name
Alarm
Severity
Possible Cause
Suggestion
AC switch is ON.
Cause ID = 31/32/33
Check the impedance of output phase
wire A (cause ID = 31)/B (cause ID =
32)/C (cause ID = 33) to the PE cable
and locate the position with lower
impedance and resolve the issue.
305
Abnormal
Grid
Frequency
Major
Cause ID = 2
The actual grid frequency is
higher than the standard
requirement for the local
power grid.
Cause ID = 4
The actual grid frequency is
lower than the standard
requirement for the local
power grid.
Cause ID = 5
The actual change rate of the
grid frequency does not meet
the standard requirement for
the local power grid.
Cause ID = 2/4
1.
If the alarm occurs accidentally,
the power grid may be abnormal
temporarily. The SUN2000
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. If yes, log in to the
SUN2000 app, SmartLogger, or
NMS to modify the grid
overfrequency and underfrequency
protection thresholds with the
consent of the local power
operator.
Cause ID = 5
1.
If the alarm occurs accidentally,
the power grid may be abnormal
temporarily. The SUN2000
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.
313
Low
Insulation
Resistance
Major
Cause ID = 1
A short circuit occurs
between the PV string and
the PGND cable.
The PV string is installed in a
moist environment for a long
time.
1.
Check the impedance between the
PV string and the PGND cable. If
a short circuit occurs, rectify the
fault.
2.
If you are sure that the impedance
is less than the default value in a
cloudy or rainy environment, log
in to the SUN2000 app,
SmartLogger, or NMS and set
Insulation resistance protection
.
318
Abnormal
Major
Cause ID = 1
1.
If the alarm occurs accidentally,
the external circuit may be