Troubleshooting - Huawei SUN2000-90KTL Series User Manual

SUN2000-(90KTL, 95KTL, 100KTL, 105KTL) Series
User Manual

8.4 Troubleshooting

Alarm severities are defined as follows:



Table 8-2 Common alarms and troubleshooting measures
Alarm Alarm Name
ID
2001 High string input
voltage
2011 String Reverse
Connection
2012 String current
backfeed
Issue 10 (2020-03-28)
Major: The inverter is faulty. As a result, the output power decreases or the grid-tied
power generation is stopped.
Minor: Some components are faulty without affecting the grid-tied power generation.
Warning: The inverter works properly. The output power decreases or some authorization
functions fail due to external factors.
Alarm
Severity
Major
Major
Warning
Copyright © Huawei Technologies Co., Ltd.
Cause
The PV array is incorrectly
configured. Excessive PV
modules are connected in
series to the PV string, and
hence the PV string
open-circuit voltage exceeds
the maximum operating
voltage of the SUN2000.

Cause ID = 1 corresponds
to PV strings 1 and 2.
 Cause ID = 2 corresponds
to PV strings 3 and 4.

Cause ID = 3 corresponds
to PV strings 5 and 6.
 Cause ID = 4 corresponds
to PV strings 7 and 8.

Cause ID = 5 corresponds
to PV strings 9 and 10.
 Cause ID = 6 corresponds
to PV strings 11 and 12.
The PV string is reversely
connected.
Cause IDs 1 to 12 respectively
correspond to PV strings 1 to
12.
1. Only a few PV modules
are connected in series to
the PV string, and hence
the end voltage is lower
than that of other PV
strings.
2. The PV string is shaded.
8 Maintenance
Measures
Reduce the number of PV
modules connected in series
to the PV string until the PV
string open-circuit voltage is
less than or equal to the
maximum operating voltage
of the SUN2000. After the
PV array configuration is
corrected, the alarm stops.
Check whether the PV string
is reversely connected to the
SUN2000. If yes, wait until
the solar irradiance declines
at night and the PV string
current reduces to below 0.5
A. Then, turn off the two
DC switches and correct the
PV string connection.
1. Check whether the
number of PV modules
connected in series to
this PV string is less than
the number of PV
modules connected in
series to the other PV
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