Alarm
ID
Alarm
Name
Alarm
Severity
Possible Cause Suggestion
2051 Abnorma
l Residual
Current
Major Cause ID = 1
The insulation impedance of the
input side to PE decreases when
the solar inverter is operating.
1. If an alarm is generated,
check whether the
impedance between PV
strings and the ground is
too low, or a PV string is
short-circuited to the
ground due to damage.
2. If the alarm occurs
frequently or persists,
check whether the
impedance between the
PV string and the ground
is too low.
2061 Abnorma
l
Groundin
g
Major Cause ID = 1
The neutral wire or PE wire is not
connected when Output mode of
the solar inverter is set to Three-
phase four-wire.
1. Check that the neutral
wire and PE wire of the
solar inverter are properly
connected.
2. Check whether the voltage
between the neutral wire
and the ground exceeds 30
V. If yes, set Output mode
to Three-phase three-
wire on the mobile app,
SmartLogger, or NMS after
obtaining the consent of
the local power operator.
2062 Low
Insulatio
n
Resistanc
e
Major Cause ID = 1
1. The PV string is short-circuited
to PE.
2. The PV string has been in a
moist environment for a long
time and the circuit is not well
insulated to ground.
1. Check the impedance of
the PV string to PE. If a
short circuit occurs or the
insulation is insucient,
rectify it.
2. Check that the PE cable of
the solar inverter 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.
SUN2000-(100KTL, 110KTL, 115KTL)-M2
User Manual 8 Maintenance
Issue 02 (2022-06-30) Copyright © Huawei Technologies Co., Ltd. 99
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