Huawei SUN2000-(25KTL, 30KTL)-US User Manual page 96

SUN2000-(25KTL, 30KTL)-US
User Manual
Table 8-2 Troubleshooting
Alarm ID Alarm
Name
DC Over
103
Voltage
106 to 111 String 1-6
Abnormal
Issue 03 (2017-04-01)
Alarm Causes
Severity

Major Cause ID = 1
The PV array is not
properly configured.
Excessive PV modules are
connected in series to PV
strings 1 and 2, and hence
the PV string open-circuit
voltage exceeds the inverter
maximum power point
(MPP) voltage.
 Cause ID = 2
The PV array configuration
is not proper. Excessive PV
modules are connected in
series to PV strings 3 and 4,
and hence the PV string
open-circuit voltage exceeds
the inverter MPP voltage.

Cause ID = 3
The PV array configuration
is not proper. Excessive PV
modules are connected in
series to PV strings 5 and 6,
and hence the PV string
open-circuit voltage exceeds
the inverter MPP voltage.
Warning Cause ID = 1
 The PV string is shielded
from sunlight for a long
time.
 The PV string deteriorates
or is damaged.
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Measures

Cause ID = 1
Reduce the number of PV
modules connected in series to
PV strings 1 and 2 until the
open-circuit voltage is less than
or equal to the maximum inverter
input voltage. After the PV array
configuration is corrected, the
alarm disappears.
 Cause ID = 2
Reduce the number of PV
modules connected in series to
PV strings 3 and 4 until the
open-circuit voltage is less than
or equal to the maximum inverter
input voltage. After the PV array
configuration is corrected, the
alarm disappears.

Cause ID = 3
Reduce the number of PV
modules connected in series to
PV strings 5 and 6 until the
open-circuit voltage is less than
or equal to the maximum inverter
input voltage. After the PV array
configuration is corrected, the
alarm disappears.
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.
8 Maintenance
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