Huawei SUN2000 User Manual page 154

SUN2000-(3.8KTL-11.4KTL)-USL0
User Manual
Alarm Alarm
ID Name
2051 Abnormal
Residual
Current
2061 Abnormal
Grounding
2062 Low
Insulation
Resistance
Issue 01 (2018-05-21)
Alarm Alarm
Severity Action
Major Shutdown,
alarm
reporting, and
automatic
recovery after
the fault is
rectified
Major Shutdown,
alarm
reporting, and
automatic
recovery after
the fault is
rectified
Major Shutdown,
alarm
reporting, and
automatic
recovery after
the fault is
rectified
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Possible Cause
Cause ID = 1
The insulation
impedance of the input
side to PE decreases
when the SUN2000 is
operating.
Cause ID = 1
 The PE cable for the
SUN2000 is not
connected.
 The voltage between
the SUN2000
neutral wire and
ground exceeds the
upper threshold.
Cause ID = 1
 The PV string is
short-circuited to
PE.
 The PV string has
been operating in a
moist environment
for a long time.
8 System Maintenance
Suggestion
1. If the alarm is triggered
accidentally, the
external power cable
may be abnormal
temporarily. The
SUN2000 automatically
recovers after the fault is
rectified.
2. If the alarm is triggered
frequently or persists,
check that the
impedance between the
PV string and ground is
not below the lower
threshold.
1. Check that the PE cable
for the SUN2000 is
connected properly.
2. If the SUN2000 is
connected to the TN
power grid, check
whether the voltage of
the neutral wire to
ground is normal.
3. Check whether the
output is connected to an
isolation transformer. If
so, set OFF due to
abnormal grounding to
Disable (for details, see
7.4.5.3 Feature
Parameters).
1. Check the impedance
between the PV array
output and PE, and
eliminate short circuits
and poor insulation
points.
2. Check that the
SUN2000 PE cable is
correctly connected.
3. If you are sure that the
impedance is less than
the default value in a
cloudy or rainy
environment, reset
Insulation resistance
protection.
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