Huawei SUN2000-55KTL Series User Manual page 107

SUN2000-(55KTL, 60KTL) Series
User Manual
Alarm ID Alarm
Name
305 Abnormal
Grid
Frequenc
y
313 Low
Insulation
Resistanc
e
Issue 06 (2020-01-03)
Alarm Possible Cause
Severity
Major  Cause ID = 2
The actual power grid
frequency is higher than the
standard requirement for
the local power grid.

Cause ID = 4
The actual power grid
frequency is lower than the
standard requirement for
the local power grid.

Cause ID = 5
The actual change rate of
the power grid frequency
does not meet the standard
requirement for the local
power grid.
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.
Copyright © Huawei Technologies Co., Ltd.
8 System Maintenance
Suggestion
Cause ID = 33
Check the impedance of output phase
wire C to the PE cable, locate the
position with lower impedance, and
resolve the issue.
Cause ID = 2/4
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 power 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 power 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 inverter
automatically recovers after
detecting that the power grid
becomes normal.
2. If the alarm occurs frequently,
check whether the power grid
frequency is within the acceptable
range. If no, contact the local
power operator.
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.
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