Huawei SUN2000 Series User Manual page 99

SUN2000-(29.9KTL, 33KTL-A, 36KTL, 42KTL)
User Manual
Alarm ID Alarm
Name
318 Abnormal
Residual
Current
321 Cabinet
Overtempe
rature
326 Abnormal
Grounding
System
400
Fault
Abnormal
410
Auxiliary
Power
Issue 11 (2019-06-08)
Alarm Possible Cause
Severity
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.
Major Cause ID = 1/3/21/23/27
An unrecoverable fault occurs
on a circuit inside the
SUN2000.
Major Cause ID = 4
The sampling control board has
an abnormal voltage, which
may be caused by the
following:
 The internal power chip of
the sampling control board
is faulty.
 The detection circuit
becomes faulty.
Copyright © Huawei Technologies Co., Ltd.
Suggestion
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.
Check that the neutral wire or PGND
cable properly connects to 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.
1. When the alarm is generated, the
SUN2000 shuts down
automatically. When the fault is
rectified, the SUN2000 starts
automatically.
2. If the alarm persists, contact
Huawei technical support.
8 Maintenance
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