Huawei 01075345 User Manual page 103

SUN2000-(2KTL-6KTL)-L1
User Manual
Alarm Alarm Name
ID
2051 Abnormal
Residual
Current
2062 Low Insulation
Resistance
Issue 10 (2023-02-13)
Alarm Possible Causes
Severity
Major Cause ID = 1
The insulation impedance
of the input side to PE
decreases when the
SUN2000 is operating.
Major Cause ID = 1
● A short circuit occurs
between the PV array
and the ground.
● The ambient air of the
PV array is damp and
the insulation between
the PV array and the
ground is poor.
Copyright © Huawei Technologies Co., Ltd.
8 System Maintenance
Troubleshooting
1. If the alarm occurs
occasionally, the
external circuit may be
abnormal temporarily.
The SUN2000
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 the output
impedance of the PV
array to ground. If there
is a short circuit or lack
of insulation, rectify it.
2. Check that the PE cable
of the SUN2000 is
correctly connected.
3. If the impedance is
lower than the specified
protection threshold in
rainy and cloudy days,
set Insulation
resistance protection
using the mobile App,
SmartLogger, or NMS.
Current insulation
resistance: x MΩ,
possible short circuit
position: x%. The short
circuit position is valid
for a single PV string. If
there are multiple PV
strings, check the PV
strings one by one. For
details, see E Locating
Insulation Resistance
Faults.
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