Table 8-2 Common alarms and troubleshooting measures
Alarm
ID
Alarm
Name
Alarm
Severity
Cause Measures
2001 High
String
Input
Voltage
Major The PV array is incorrectly
congured. 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.
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
conguration is
corrected, the alarm stops.
2011 String
Reverse
Connec
tion
Major The PV string is reversely
connected.
Cause IDs 1 to 12 respectively
correspond to PV strings 1 to 12.
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
o the two DC
switches and correct the PV
string connection.
2012 String
Current
Backfee
d
Warning 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.
Cause IDs 1 to 12 respectively
correspond to PV strings 1 to 12.
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
strings. If yes, connect
more PV modules in series
to this PV string.
2. Check the open-circuit
voltage of the PV string.
3. Check that the PV string is
not shaded.
SUN2000-(70KTL, 75KTL)-C1
User Manual 8 Maintenance
Issue 09 (2020-10-12) Copyright © Huawei Technologies Co., Ltd. 98
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