Huawei SUN2000-55KTL Series User Manual page 108

SUN2000-(55KTL, 60KTL) Series
User Manual
Alarm ID Alarm
Name
318 Abnormal
Residual
Current
321 Cabinet
Overtemp
erature
322 Abnormal
SPI
Communi
cation
326 Abnormal
Groundin
g
400 System
Fault
Issue 06 (2020-01-03)
Alarm Possible Cause
Severity
Major Cause ID = 1
The insulation resistance
against the PGND cable at the
input side decreases when the
inverter is running, which
causes an excessively high
residual current.
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.
Major Cause ID = 1
An unrecoverable fault occurs
on a circuit inside the inverter.
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.
Major Cause ID = 1/3/21/23/27
An unrecoverable fault occurs
on a circuit inside the inverter.
Copyright © Huawei Technologies Co., Ltd.
8 System Maintenance
Suggestion
1. If the alarm occurs accidentally,
the external circuit may be
abnormal temporarily. The
inverter 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.
1. Check the ventilation and
ambient temperature of the
inverter 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.
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.
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.
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.
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