Huawei SUN2000L User Manual page 73

SUN2000L-(2KTL-5KTL)
User Manual
Alarm Alarm Name
ID
2051 Abnormal
Residual
Current
Abnormal
2061
Grounding
2062 Low Insulation
Resistance
Issue 06 (2020-03-19)
Alarm Possible Cause
Severity
Major Cause ID = 1
The insulation impedance of
the input side to PE
decreases when the
SUN2000L is operating.
Major Cause ID = 1
 The PE cable for the
SUN2000L is not
connected.
 The voltage between the
SUN2000L neutral wire
and ground exceeds the
upper threshold.
Major Cause ID = 1

The PV string is
short-circuited to PE.
 The PV string is installed
in a moist environment
for a long time.
Copyright © Huawei Technologies Co., Ltd.
7 System Maintenance
Suggestion
1. If the alarm occurs
accidentally, the external
power cable may be abnormal
temporarily. The SUN2000L
automatically recovers after the
fault is rectified.
2. If the alarm occurs frequently
or persists, check whether the
impedance between the PV
string and ground is below the
lower threshold.
1. Check that the PE cable for the
SUN2000L is connected
properly.
2. Check that the voltage between
the SUN2000L neutral wire
and ground is within the
normal range. If an isolation
transformer is connected, set
Grounding inspection to
Disable.
3. If the connections of the PE
cable and neutral wire of the
inverter are restored, this alarm
is automatically cleared 1 hour
after the alarm is generated or
after the inverter is powered off
and restarted.
1. Check the impedance between
the PV array output and PE,
and eliminate short circuits and
poor insulation points.
2. Check that the SUN2000L PE
cable is correctly connected.
3. If you confirm that the
impedance is less than the
default value in a cloudy or
rainy environment, reset
Insulation resistance
protection.
67