Troubleshooting - Huawei SUN2000-33KTL User Manual

SUN2000-(33KTL, 40KTL)
User Manual

8.2 Troubleshooting

This section describes the troubleshooting measures for common fault alarms in the
SUN2000.
The alarm severity is defined as follows:
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

Table 8-2
Table 8-2 Troubleshooting
Alarm ID Alarm
Name
103 DC Over
Voltage
106 to 111 String 1-6
Abnormal
120 to 125 String 1-6
Reverse
Issue 03 (2015-12-01)
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.
lists the troubleshooting measures for common fault alarms in the SUN2000.
Alarm Causes
Severity
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.
Warning  PV strings have been
shielded for a long time.
 PV strings are
deteriorating.
Warning The cables of PV strings are
connected reversely during
SUN2000 installation.
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8 Maintenance
Measures
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.
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.
Check whether the cables of PV
strings are correctly connected. If
they are connected reversely,
reconnect the cables.
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