Huawei SUN2000-75KTL Series User Manual page 127

SUN2000-(75KTL, 100KTL, 110KTL, 125KTL) Series
User Manual
Alarm Alarm
ID Name
2051 Abnorm
al
Residual
Current
2061 Abnorm
al
Groundi
ng
2062 Low
Insulatio
n
Resistan
ce
Issue 11 (2021-11-10)
Alarm Possible Causes
Severit
y
Major Cause ID = 1
The insulation impedance of the
input side to PE decreases when
the solar inverter is operating.
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.
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.
Copyright © Huawei Technologies Co., Ltd.
8 Maintenance
Suggestions
1. If the alarm occurs
occasionally, the external
circuit may be abnormal
temporarily. The solar
inverter automatically
recovers after the fault is
rectified.
2. If the alarm occurs
frequently or persists,
check whether the
impedance between the PV
string and the ground is
too low.
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.
1. Check the impedance of
the PV string to PE. If a
short circuit occurs or the
insulation is insufficient,
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.
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