Huawei SUN2000-33KTL-US User Manual page 114

SUN2000-(33KTL, 36KTL, 40KTL)-US
User Manual
Alarm ID Alarm
Name
313 Low
Insulation
Resistance
Abnormal
318
Residual
Current
321 Cabinet
Overtempe
rature
326 Abnormal
Grounding
400 System
Fault
Issue 07 (2019-06-20)
Alarm Possible Cause
Severity
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.
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.
Major Cause ID = 1
 The SUN2000 is installed
in a place with poor
ventilation.

The ambient temperature
exceeds the upper
threshold.
 The internal fan works
abnormally.
Major Cause ID = 1
 The neutral wire or PGND
cable does not connect to
the SUN2000.

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
SUN2000.
Copyright © Huawei Technologies Co., Ltd.
Suggestion
is within the acceptable range. If
no, contact the local power
operator.
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.
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.
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.
1. Check that the neutral wire or
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
8 Maintenance
107