Huawei SUN2000 User Manual page 120

SUN2000 (8KTL-28KTL)
User Manual
Alarm
ID
318
321
326
400
Issue 07 (2014-07-30)
Alarm Alarm
Causes
Name Severit
y
Residual Major The insulation resistance
Current against the ground at the
Abnorm input side becomes
al lower in operating mode,
which causes
excessively high residual
current.
1. The inverter
Cabinet Major
Over-Te
mp
2. The environment
3. The internal fan is
Electrica Major 
l
Groundi
ng Fault

System Major An unrecoverable fault
Fault occurs on a circuit inside
the SUN2000.
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
installation location
is not well ventilated.
temperature is too
high.
not working.
The neutral wire and
ground cable are not
connected to the
SUN2000.
When you ground
PV arrays, the
isolation transformer
is not connected to
the SUN2000 at the
output side.
8 Maintenance
Measures
1. If the fault occurs
accidentally, the possible
cause is that the external
circuits are abnormal
accidentally. The
SUN2000 automatically
recovers to the normal
operating status after the
fault is rectified.
2. If the fault occurs
repeatedly and lasts a long
time, check the insulation
resistance against the
ground of PC arrays is
excessively low.
Check whether the operating
temperature of the UNS2000
exceeds the upper limit. If
yes, improve ventilation to
decrease the temperature.
1. Check that the neutral
wire and ground cable are
properly connected.
2. When PV arrays are
grounded, check whether
the SUN2000 needs to
connect to an isolation
transformer at the output
side. If yes, connect the
transformer to the
SUN2000.
Flip the DC switch on the
SUN2000 to OFF, wait for 5
minutes, and flip the DC
switch to ON. Check whether
the fault is rectified. If no,
contact Huawei technical
support.
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