Huawei SUN2000-2KTL-L1 User Manual page 88

SUN2000-(2KTL-5KTL)-L1
User Manual
Alarm ID Alarm
Name
2039 Output
Overcurre
nt
2040 Output
DC
Compone
nt
Overhigh
2051 Abnormal
Residual
Current
2062 Low
Insulation
Resistanc
e
Issue 01 (2020-04-17)
Alarm Possible Causes
Severity
Major Cause ID = 1
The power grid voltage drops
dramatically or the power grid
is short-circuited. As a result,
the SUN2000 transient output
current exceeds the upper
threshold and therefore the
SUN2000 protection is
triggered.
Major Cause ID = 1
The DC component of the
SUN2000 output current
exceeds the specified upper
threshold.
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. The SUN2000 detects its external
working conditions in real time.
After the fault is rectified, the
SUN2000 automatically recovers.
2. If the alarm occurs frequently and
affects the energy yield of the
power plant, check whether the
output is short-circuited. If the
fault persists, contact your dealer
or Huawei technical support.
1. The SUN2000 detects its external
working conditions in real time.
After the fault is rectified, the
SUN2000 automatically recovers.
2. If the alarm occurs frequently,
contact your dealer or Huawei
technical support.
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
Locating Insulation Resistance
Faults.
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