Huawei SUN2000-23KTL - Page 120

SUN2000 (8KTL-28KTL)
User Manual
8 Maintenance
Issue 07 (2014-07-30)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
114
Alarm
ID
Alarm
Name
Alarm
Severit
y
Causes
Measures
318
Residual
Current
Abnorm
al
Major
The insulation resistance
against the ground at the
input side becomes
lower in operating mode,
which causes
excessively high residual
current.
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.
321
Cabinet
Over-Te
mp
Major
1. The inverter
installation location
is not well ventilated.
2. The environment
temperature is too
high.
3. The internal fan is
not working.
Check whether the operating
temperature of the UNS2000
exceeds the upper limit. If
yes, improve ventilation to
decrease the temperature.
326
Electrica
l
Groundi
ng Fault
Major

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.
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.
400
System
Fault
Major
An unrecoverable fault
occurs on a circuit inside
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.