SUN2000-(33KTL, 40KTL)-JP
User Manual
9 Maintenance
Issue 07 (2019-06-30)
Copyright © Huawei Technologies Co., Ltd.
113
Ala
rm
ID
Alarm
Name
Alarm
Severit
y
Possible Cause
Suggestion
313
Low
Insulatio
n
Resistanc
e
Major
Cause ID = 1
A short circuit occurs
between the PV string and
the PGND cable.
The PV string is installed
in a moist environment for
a long time.
1.
Check the impedance between the PV
string and the PGND cable. If a short
circuit occurs, rectify the fault.
2.
If you are sure that the impedance is less
than the default value in a cloudy or rainy
environment, log in to the SUN2000 app,
SmartLogger, or NMS and set
Insulation
resistance protection
.
318
Abnorma
l
Residual
Current
Major
Cause ID = 1
The insulation resistance
against the PGND cable at the
input side decreases when the
SUN2000 is running, which
causes an excessively high
residual current.
1.
If the alarm occurs accidentally, the
external circuit may be abnormal
temporarily. The SUN2000 automatically
recovers after fault is rectified.
2.
If the alarm occurs repeatedly or persists,
check whether the impedance between the
PV string and the ground is excessively
low.
321
Cabinet
Overtem
perature
Major
Cause ID = 1
The inverter is installed in
a place with poor
ventilation.
The ambient temperature
exceeds the upper
threshold.
The internal fan works
abnormally.
1.
Check the ventilation and ambient
temperature of the SUN2000 installation
position.
2.
If the ventilation is poor or the ambient
temperature exceeds the upper threshold,
improve the ventilation and heat
dissipation.
3.
If the ventilation and ambient temperature
both meet requirements, contact Huawei
technical support.
322
Abnorma
l SPI
Commun
ication
Major
Cause ID = 1
An unrecoverable fault occurs
on a circuit inside the
SUN2000.
Turn off the AC output switch and DC input
switch. Then turn on the AC output switch
and DC input switch after 5 minutes. If the
fault persists, contact Huawei technical
support.
326
Abnorma
l
Groundin
g
Major
Cause ID = 1
The PGND cable does not
connect to the inverter.
The SUN2000 output side
does not connect to an
isolation transformer when
the PV string output is
grounded.
1.
Check that the PGND cable properly
connects to the inverter.
2.
If the PV string output is grounded, check
that the SUN2000 output side connects to
an isolation transformer.
400
System
Fault
Major
Cause ID = 1/3/21/23/27
An unrecoverable fault occurs
on a circuit inside the
SUN2000.
Turn off the AC output switch and DC input
switch. Then turn on the AC output switch
and DC input switch after 5 minutes. If the
fault persists, contact Huawei technical
support.
410
Abnorma
l
Major
Cause ID = 4
The sampling control board
1.
When the alarm is generated, the inverter
shuts down automatically. When the fault