Huawei SUN2000-20KTL - Page 115

SUN2000 (8KTL-28KTL)
User Manual
8 Maintenance
Issue 07 (2014-07-30)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
109
The alarm severity is defined as follows:

Major: The SUN2000 enters the shutdown mode and disconnects from the power grid to
stop generating electricity after a fault occurs.

Minor: Some components are faulty but the SUN2000 can still generate electricity.

Warning: The SUN2000 output power decreases due to external factors.
For details, see Table 8-2.
Table 8-2 Rectifying common faults
Alarm
ID
Alarm
Name
Alarm
Severit
y
Causes
Measures
103
DC
Over
Voltage
Major
Too many PV modules
connected in series lead
to excessively high
output voltage of PV
arrays, making the open
circuit voltage of the PV
arrays greater than the
maximum input voltage
of the SUN2000.
Check whether the large
number of PV modules
connected in series make the
open circuit voltage of the PV
arrays greater than the
maximum input voltage of the
SUN2000. If yes, adjust the
number of PV arrays
connected in series to
decrease the output voltage of
PV arrays to meet the voltage
requirements for the
SUN2000. If no, contact
Huawei technical support.
After the adjustment, ensure
that the SUN2000 works
properly.
106 to
111
String
1-6
Abnorm
al
Warnin
g

PV arrays are
shielded for a long
time.

PV arrays
deteriorate.
1. Check whether the output
current of a PV array is
obviously less than the
output current of other PV
arrays.
2. If yes, check whether the
PV array is shielded.
3. If the PV array is clear
and is not shielded, check
whether the PV modules
are faulty.
120 to
125
String
1-6
Reverse
Warnin
g
The cables between PV
arrays are connected
reversely during
SUN2000 installation.
Check whether the cables
between PV arrays are
connected reversely. If they
are connected reversely,
reconnect the cables properly.