Alarm
ID
Alarm Name Alarm
Severity
Possible Causes Troubleshooting
2051 Abnormal
Residual
Current
Major Cause ID = 1
The insulation impedance
of the input side to PE
decreases when the
SUN2000 is operating.
1. If the alarm occurs
occasionally, the
external circuit may be
abnormal temporarily.
The SUN2000
automatically recovers
after the fault is
rectied.
2. If the alarm occurs
frequently or persists,
check whether the
impedance between the
PV string and the
ground is too low.
2062 Low Insulation
Resistance
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.
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 specied
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
.
SUN2000-(2KTL-6KTL)-L1
User Manual 8 System Maintenance
Issue 04 (2021-04-01) Copyright © Huawei Technologies Co., Ltd. 88
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