SUN2000-(55KTL, 60KTL) Series
User Manual
8 System Maintenance
Issue 02 (2017-07-30)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
98
Alarm ID Alarm
Name
Alarm
Severity
Possible Cause
Suggestion
temporarily. The inverter
automatically recovers after
detecting that the power grid
becomes normal.
2.
If the alarm occurs frequently,
check whether the power grid
frequency is within the
acceptable range. If no, contact
the local power operator.
313
Low
Insulation
Resistance
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
Abnormal
Residual
Current
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.
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.
321
Cabinet
Overtempe
rature
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
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.
322
Abnormal
SPI
Communic
ation
Major
Cause ID = 1
An unrecoverable fault occurs
on a circuit inside the inverter.
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
Abnormal
Grounding
Major
Cause ID = 1
The PGND cable does not
1.
Check that the PGND cable
properly connects to the inverter.