SUN2000-(33KTL, 40KTL)
User Manual
8 Maintenance
Issue 03 (2015-12-01)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
76
8.2 Troubleshooting
This section describes the troubleshooting measures for common fault alarms in the
SUN2000.
The alarm severity is defined as follows:
Major: The SUN2000 enters the shutdown mode and stops feeding electricity to the
power grid due to a fault.
Minor: Some components are faulty but the SUN2000 can still feed electricity to the
power grid.
Warning: The SUN2000 output power decreases due to external factors.
Table 8-2
lists the troubleshooting measures for common fault alarms in the SUN2000.
Table 8-2
Troubleshooting
Alarm ID Alarm
Name
Alarm
Severity
Causes
Measures
103
DC Over
Voltage
Major
Too many PV modules
connected in series lead to
excessively high output
voltage of PV strings, making
the open circuit voltage of the
PV strings greater than the
maximum input voltage of the
SUN2000.
Check whether a large number of PV
modules connected in series makes
the open circuit voltage of the PV
strings greater than the maximum
input voltage of the SUN2000. If
yes, adjust the number of PV
modules connected in series to
decrease the output voltage of PV
strings to meet the voltage
requirements for the SUN2000.
After the adjustment, ensure that the
SUN2000 works properly. If no,
contact Huawei technical support.
106 to 111
String 1-6
Abnormal
Warning
PV strings have been
shielded for a long time.
PV strings are
deteriorating.
1.
Check whether the output current
of a PV string is obviously less
than the output current of other
PV strings.
2.
If yes, check whether the PV
string is shielded.
3.
If the PV string is clean and not
shielded, check whether the PV
modules are faulty.
120 to 125
String 1-6
Reverse
Warning
The cables of PV strings are
connected reversely during
SUN2000 installation.
Check whether the cables of PV
strings are correctly connected. If
they are connected reversely,
reconnect the cables.